Change search
Refine search result
123 1 - 50 of 121
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the 'Create feeds' function.
  • 1. Bakkabulindi, G.
    et al.
    Hesamzadeh, Mohammad Reza
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Amelin, Mikael
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Da Silva, I. P.
    Models for conductor size selection in Single Wire Earth Return distribution networks2013In: IEEE AFRICON 2013, IEEE conference proceedings, 2013, 6757773- p.Conference paper (Refereed)
    Abstract [en]

    The use of the ground as the current return path often presents planning and operational challenges in power distribution networks. This study presents optimization-based models for the optimal selection of conductor sizes in Single Wire Earth Return (SWER) power distribution networks. By using mixed integer non-linear programming (MINLP), models are developed for both branch-wise and primary-lateral feeder selections from a discrete set of overhead conductor sizes. The models are based on a mathematical formulation of the SWER line, where the objective function is to minimize fixed and variable costs subject to constraints specific to SWER power flow. Load growth over different time periods is considered. The practical application is tested using a case study extracted from an existing SWER distribution line in Namibia. The results were consistent for different network operating scenarios.

  • 2.
    Bakkabulindi, Geofrey
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad R.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Amelin, Mikael
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Da Silva, I.P.
    Makerere University, Faculty of Technology.
    Planning Algorithm for Single Wire Earth Return Distribution Networks2012In: Power and Energy Society General Meeting, 2012 IEEE, 2012, 1-7 p.Conference paper (Refereed)
    Abstract [en]

    Power flow in earth return distribution systems typically depends on geographical location and specific earth properties. The planning of such systems has to take into account different operational and safety constraints from conventional distribution systems. This work presents the mathematical modeling and planning of Single Wire Earth Return (SWER) power distribution networks. The SWER load flow is modeled and formulated as an optimization problem. Then by using a heuristic iterative procedure, a planning algorithm is developed for the SWER system. The developed procedure includes optimal feeder routing and overhead conductor selection for both primary and lateral feeders with load growth over several time periods. A 30 node test network extracted from a rural area in Uganda is used to test the algorithm's practical application to give reasonable and consistent results. The model presented can be used in planning SWER networks for areas which have previously not been electrified as well as determining suitable upgrades for existing SWER distribution feeders. The algorithm's mathematical modeling and simulations were done using the General Algebraic Modeling System (GAMS).

  • 3.
    Bakkabulindi, Geofrey
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad R.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Amelin, Mikael
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Da Silva, I.P.
    Lugujjo, E.
    A Heuristic Model for Planning of Single Wire Earth Return Power Distribution Networks2011In: Proceedings of the IASTED International Conference on Power and Energy Systems and Applications, PESA 2011, 2011, 215-222 p.Conference paper (Refereed)
    Abstract [en]

    The planning of distribution networks with earth return is highly dependent on the ground's electrical properties. This study incorporates a load flow algorithm for Single Wire Earth Return (SWER) networks into the planning of such systems. The earth's variable conductive properties are modelled into the load flow algorithm and the model considers load growth over different time periods. It includes optimal conductor selection for the SWER system and can also be used to forecast when an initially selected conductor will need to be upgraded. The planning procedure is based on indices derived through an iterative heuristic process that aims to minimise losses and investment costs subject to load flow constraints. A case study in Uganda is used to test the model's practical application.

  • 4.
    Baradar, Mohamadreza
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Ghandhari, Mehrdad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Ohmic loss minimization in AC transmission systems with embedded DC grids2013In: 39th Annual Conference of the IEEE Industrial Electronics Society, IECON, IEEE conference proceedings, 2013, 2117-2120 p.Conference paper (Refereed)
    Abstract [en]

    The HVDC systems built based on the voltage source converters (VSC) can bring several benefits to the AC power systems. Better voltage profile, increasing power flow controllability, lower ohmic loss, and higher transfer capability are some major benefits of such systems. This paper investigate the impact of VSC-type DC grids installed in the AC power systems on the ohmic network losses. This is done by formulating a convex optimization problem which minimises the ohmic losses (both in AC and DC grids) subject to the technical constraints of both AC and DC system. The formulated optimisation problem is a conic optimisation problem which can be solved using the commercially available optimisation softwares. The conic AC-DC optimal power flow, CAD-OPF, is coded in GAMS platform and solved using the MOSEK solver. The IEEE 30-bus example system is modeled and studied.

  • 5.
    Baradar, Mohamadreza
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad R.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    A Stochastic SOCP Optimal Power Flow With Wind Power Uncertainty2014In: 2014 IEEE PES General Meeting | Conference & Exposition, IEEE Computer Society, 2014, 6939790- p.Conference paper (Refereed)
    Abstract [en]

    Recent research shows that non-convex AC OPF problem can be recast as a convex Semidefinite (SD) problem or Second Order Cone Programming (SOCP) problem. This paper presents a stochastic SOCP OPF (SSOCP-OPF) model for power systems connected to the wind farms. This is performed by reformulating the original non-convex OPF problem using more practical parameters of the power system. Finally, we obtain a convex optimization problem through some wellknown approximations and an exact relaxation incorporating the stochastic nature of wind power. One of the advantage of convex SOCP problems, which are a general form of linear problems, is that they can be efficiently solved through Interior PointMethods (IPMs). The proposed OPF model takes advantage of both DC-OPF models (solution efficiency) and full AC-OPF models (solution accuracy). As an application of SSOCP-OPF model, we study the impact of wind power uncertainty on the transmission loss in the power systems. To evaluate the proposed stochastic model modified IEEE 30-bus test system is used. The optimization problem is coded in GAMS platform and solved using its embedded interior point optimizer MOSEK.

  • 6.
    Baradar, Mohamadreza
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad R.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Calculating Negative LMPs from SOCP-OPF2014In: ENERGYCON 2014 - IEEE International Energy Conference, IEEE Computer Society, 2014, 1461-1466 p.Conference paper (Refereed)
    Abstract [en]

    Recent research shows that non-convex OPF problem can be recast as a convex Semidefinite Programming (SDP) problem or Second Order Cone Programming (SOCP) problem. However, in the most SOCP OPF problems, there are some cases that conic relaxation results in a miscalculation of negative Local Marginal Prices (LMPs). This paper reviews the SOCP formulation of the optimal power flow problem proposed in [1] and then proposes one way of generating negative Locational Marginal Prices, LMPs, using this SOCP formulation. The proposed model is coded in GAMS and its built MOSEK solver and tested on a modified version of IEEE-30 test system.

  • 7.
    Baradar, Mohamadreza
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad R.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Transmission Loss Minimisation in Power Systems with Embedded Smart-Grid Technologies2013In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679Article in journal (Other academic)
  • 8.
    Baradar, Mohamadreza
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad R.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Ghandhari, Mehrdad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Second-order cone programming for optimal power flow in VSC-type AC-DC grids2013In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, Vol. 28, no 4, 4282-4291 p.Article in journal (Refereed)
    Abstract [en]

    This paper presents a second order cone programming (SOCP) formulation of the optimal power flow problem for AC-DC systems with voltage source converter (VSC) technology. Approximation techniques have been used to derive the SOCP formulation of the AC-DC OPF problem. Later, the SOCP formulation can be solved using the interior point method (IPM) by considering the limits on AC-DC grid. The accuracy of SOCP formulation of AC OPF has been proven with numerical examples using IEEE 14-bus, IEEE 30-bus, and IEEE 57-bus example systems. The results of the SOCP formulation are compared with available commercial software. Then a DC system with VSC technology is modeled in the IEEE 30-bus example system. The SOCP formulation of AC-DC OPF is applied to the modified IEEE 30-bus example system and the results are discussed. The limitations of derived SOCP formulation are also discussed.

  • 9.
    Baradar, Mohamadreza
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad Reza
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    AC Power Flow Representation in Conic Format2015In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, Vol. 30, no 1, 546-547 p.Article in journal (Refereed)
    Abstract [en]

    This letter presents a second-order cone formulation for AC power flow problem. The power flow equations are first derived as functions of more practical variables of power systems and then placed in a second-order cone programming (SOCP) problem. The proposed conic power flow (CPF) model can be solved efficiently through IPMs, and at the same time, it has a very good accuracy as compared to the full AC power flow model. Also, the proposed CPF can efficiently handle the ill-conditioned networks. The numerical efficiency and good accuracy of the model are shown by simulating various case studies.

  • 10.
    Baradar, Mohamadreza
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad Reza
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Ghandhari, Mehrdad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Modelling of multi-terminal HVDC systems in optimal power flow formulation2012In: 2012 IEEE Electrical Power and Energy Conference, EPEC 2012, IEEE , 2012, 170-175 p.Conference paper (Refereed)
    Abstract [en]

    The multi-terminal HVDC systems and their embedded DC networks are considered as smart grids technology which improve economic efficiency of the power system. This technology allows better voltage profile in the power system by better allocation of the generation sources. Also, it can help in improving the economic efficiency of the system by substituting the high-cost generation with low-cost generation. In order to assess the technical benefit of this smart grids technology, this paper presents an optimal power flow formulation for AC grids with embedded DC networks built from multi-terminal HVDC systems. The objective function of this AC-DC OPF formulation is the total active dispatch costs. The constraints consist of (a) AC grid constraints, (b) constraints from multi-terminal HVDC systems, and (c) DC grid constraints. The formulated AC-DC OPF is a mixed-integer nonlinear optimisation problem. The formulation is coded in GAMS platform and tested on IEEE 30 Bus system.

  • 11. Biggar, D.
    et al.
    Hesamzadeh, Mohammad R.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Designing transmission rights to facilitate hedging2013In: 2013 10th International Conference on the European Energy Market (EEM), IEEE , 2013, 6607320- p.Conference paper (Refereed)
    Abstract [en]

    In a liberalised wholesale electricity market risk-averse market participants need some form of financial instrument to offset the risks of spot price variation across locations and across time. Some liberalised wholesale electricity markets seek to facilitate transactions across separately-priced nodes by making available an instrument known as a Financial Transmission Right (or FTR). But FTRs are flawed as a hedging instrument. They do not necessarily make available the full set of funds required to allow market participants to hedge locational price differences. Furthermore, conventional FTRs, which are associated with a volume which is fixed in advance, are not useful for hedging transactions where the volume depends on market conditions at the time. This paper proposes introducing a new form of transmission right which mimics the operation of a 'cap' hedge contract. This transmission right can be combined into a portfolio which provides the natural backing for the price-dependent volume-varying hedge that most market participants require. We consider that this new design of transmission rights offers promise as an approach for facilitating hedging and improving market outcomes in wholesale electricity markets.

  • 12. Biggar, D.
    et al.
    Hesamzadeh, Mohammad Reza
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Modelling the hedging decisions of a generator with market power2011In: 17th Power Systems Computation Conference, PSCC 2011, Power Systems Computation Conference ( PSCC ) , 2011Conference paper (Refereed)
    Abstract [en]

    The incentive on an electricity generating firm to exercise market power depends strongly on the volume the firm has pre-sold in the forward or hedge markets. Therefore, in order to forecast the effect of mergers and other market developments on market power outcomes, it is essential to model the hedging decisions of dominant generating firms. This paper shows that a dominant firm's profit-maximizing choice of hedge level depends on the extent to which the hedge price varies with the firm's hedging decision. In the case in which the hedge price is independent of the firm's hedge level, the optimal choice of hedging is an "all or nothing" decision. In this case, there is no equilibrium level of hedging in pure strategies. This outcome may explain the observed lack of hedge market liquidity in wholesale electricity markets with substantial market power. We also model the equilibrium hedging outcome in a two-stage Cournot oligopoly and show that, even if the hedge price is independent of the hedging decisions of the firms, a rational expectations equilibrium can exist with high levels of hedging if there are enough firms in the market.

  • 13. Biggar, D. R.
    et al.
    Hesamzadeh, Mohammad Reza
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    The Economics of Electricity Markets2014Book (Other academic)
    Abstract [en]

    Around the world, the electricity industry is in the process of undergoing a fundamental transition. Twenty years ago, electricity was primarily generated at large, industrial-scale generating plants, and transported in one direction to consumers via the transmission and distribution networks. The large generators were typically closely integrated into the operation of the transmission and distribution networks. Electricity consumers, on the other hand, were treated as essentially passive. This paradigm has changed and will change further. Around the world, a number of regions have chosen to introduce competition and competitive markets into the generation of electricity. In most of these regions, the operation of generation and transmission is coordinated through market mechanisms. This required a substantial change in the way the electricity industry is organised and operated.

  • 14. Biggar, Darryl R.
    et al.
    Hesamzadeh, Mohammad R.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Modeling the Hedging Decisions of a Generator with Market Power2011Conference paper (Refereed)
    Abstract [en]

    The incentive on an electricity generatingfirm to exercise market power depends strongly on thevolume the firm has pre-sold in the forward or hedge markets.Therefore, in order to forecast the effect of mergersand other market developments on market power outcomes,it is essential to model the hedging decisions ofdominant generating firms. This paper shows that a dominantfirm’s profit-maximizing choice of hedge level dependson the extent to which the hedge price varies withthe firm’s hedging decision. In the case in which the hedgeprice is independent of the firm’s hedge level, the optimalchoice of hedging is an “all or nothing” decision. In thiscase, there is no equilibrium level of hedging in purestrategies. This outcome may explain the observed lack ofhedge market liquidity in wholesale electricity marketswith substantial market power. We also model the equilibriumhedging outcome in a two-stage Cournot oligopolyand show that, even if the hedge price is independent of thehedging decisions of the firms, a rational expectationsequilibrium can exist with high levels of hedging if thereare enough firms in the market.

  • 15. Biggar, Darryl R.
    et al.
    Hesamzadeh, Mohammad R.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Towards a Theory of Optimal Dispatch in the Short Run2011Conference paper (Refereed)
    Abstract [en]

    In a typical liberalized wholesale electricity market, the output of controllable units is determined at regular intervals through a dispatch process. However, since the physical limits of power systems must be respected down to time scales shorter than the dispatch interval, in practice system operators must also be able adjust the output of controllable units over very short time frames - typically through the procurement and dispatch of reserves, ancillary services or balancing services. To date, the procurement and dispatch of balancing services has been guided by heuristics and rules of thumb. Yet the approach to the dispatch of balancing services can have a significant impact on the pre-contingent or system normal dispatch of the power system. In principle, improvements in the efficiency of the dispatch of balancing services could significantly improve the efficiency of the utilization of power system assets. This paper observes that the dispatch of balancing services should correspond to optimal dispatch in a dispatch process with a very short dispatch interval. We also identify a set of conditions which the procurement and dispatch of balancing services should satisfy and compare those conditions to the current arrangements for ancillary services in the Australian National Electricity Market.

  • 16.
    Chaigneau, Matthieu
    et al.
    KTH, School of Electrical Engineering (EES).
    Lannez, S.
    Passelergue, J.
    Hesamzadeh, Mohammad R.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Forward Capacity Markets: Maintaining System Reliability in Europe2012In: 9th International Conference on the European Energy Market, EEM 12, IEEE , 2012, 6254643- p.Conference paper (Refereed)
    Abstract [en]

    Meeting peak demand is a major concern for grid operators, sometimes amplified by the liberalization of the electricity industry. Peak resources operate during a short period, at a high operating cost, and face difficulties to recover their investments. Sending the proper market signals to trigger long term generation investments in these types of generating units is a critical issue. Different incentivizing approaches have been adopted worldwide to cope with this issue, from a simple administratively-determined capacity payment, to complex but field-proven market designs complying with grid constraints. In France, the so-called law "NOME" (New Organization of the Electricity Market) represents a new step in establishing a fair, transparent and efficient energy market. It also enforces market participants and system operator to design a mechanism for long-term capacity procurement. This paper will introduce the motivation for developing capacity markets and describe an advanced mechanism that has been derived from the Alstom Grid clearing engine currently in operation in North America. An adaptation of this centralized market place to the situation in Europe will be discussed and simulated with realistic dataset representing the market structure of one particular European country.

  • 17.
    Dimoulkas, Ilias
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Amelin, Mikael
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Hesamzadeh, Mohammad Reza
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Forecasting Balancing Market Prices Using Hidden Markov Models2016In: 2016 13TH INTERNATIONAL CONFERENCE ON THE EUROPEAN ENERGY MARKET (EEM), IEEE conference proceedings, 2016Conference paper (Refereed)
    Abstract [en]

    This paper presents a Hidden Markov Model (HMM) based method to predict the prices and trading volumes in the electricity balancing markets. The HMM are quite powerful in modelling stochastic processes where the underlying dynamics are not apparent. The proposed method provides both one hour and 12-36 hour ahead forecasts. The first is mostly useful to wind/solar producers in order to compensate their production imbalances while the second is important when submitting the offers to the day ahead markets. The results are compared to the ones from Markov-autoregressive model.

  • 18. Faleye, O.
    et al.
    Hesamzadeh, Mohammad R.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Modeling Demand Uncertainties in Generation and Transmission Expansion Planning: a Case Study of the Nigerian Power System2012Conference paper (Refereed)
  • 19.
    Farrokhseresht, Mana
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Farrokhseresht, Nakisa
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad Reza
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Optimizing the net transfer capacity of a cross-border interconnector by Reactive Power Planning2016In: IEEE Power and Energy Society General Meeting, IEEE, 2016Conference paper (Refereed)
    Abstract [en]

    In this paper, a method for Reactive Power Planning (RPP) is proposed which ensures voltage stability in a system with cross-border electricity flows. One or more cross-border tie-lines connect the Source-area, containing cheap generation, to the Sink-area which is willing to import this cheap power. A mathematical method is used to maximize the economic benefit of the Sink-area with respect to the cost of the installed reactive compensators which maximize the Net Transfer Capacity (NTC) of the tie-lines. An analytic expression for the NTC does not exist and two methods are henceforth proposed to approximate the NTC: (1) approximation by a piecewise linear function and (2) by a polynomial obtained with statistical regression. The method is programmed in GAMS and formulated as a Mixed-Integer Non-Linear Programming problem (MINLP).

  • 20.
    Farrokhseresht, Mana
    et al.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Hesamzadeh, Mohammad Reza
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Rahimi, Saeed
    Lin, Jeremy
    Optimal Power Flow for Reactive Power Compensation Increasing the Cross-Border Transmission Capacity2015In: 2015 IEEE 15TH INTERNATIONAL CONFERENCE ON ENVIRONMENT AND ELECTRICAL ENGINEERING (IEEE EEEIC 2015), IEEE , 2015, 2135-2140 p.Conference paper (Refereed)
    Abstract [en]

    Increasing the Net Transfer Capacity (NTC) of tie-lines between different grid areas may lead to a decrease in the cost to generate electricity in one area if this cost is more expensive than the cost of importing power from neighbouring areas over those tie-lines. An effective means to increase the cross-border transmission capacity is by installing reactive power compensation devices. In this paper, a multi-objective optimization is devised that optimally locates and sizes reactive compensation devices in a grid, so that the net benefit of increasing the NTC value of a tie-line is maximized and the maximum voltage stability indicator (L-index) in the grid area is minimized, indicating there is enough voltage stability margin. The genetic algorithm NSGA-II is implemented to perform the optimization. The IEEE 30-bus and 14-bus test grids are used as two interconnected areas.

  • 21.
    Farrokhseresht, Mana
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Rahimi, Saeed
    Hesamzadeh, Mohammad Reza
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Evaluation of Reactive Power Compensation on Voltage Stability and NTC values in the Swedish Transmission Network2014Conference paper (Refereed)
    Abstract [en]

    In this paper, the voltage stability of the Swedish grid is studied by a twofold approach. Firstly, the loads within Sweden are increased and the effect on the voltage of the tie-line buses is examined. Secondly, the exchanging of power between the two neighboring countries, Denmark and Finland, is taken into account. The main objective of this paper is to show that different reactive power compensation scenarios within the Swedish network and also in the vicinity of the tie-lines will improve the voltage stability of the whole system and also will increase the maximum power transfer on the tie-lines. With the method of this paper, we will be able to suggest the best places where the reactive power compensation can improve the voltage stability. Finally, an optimization problem for installing reactive power compensation from economic point of view is formulated. The CIGRE Nordic 32-A model has been used as test system and all the simulations have been done in PSS/E and Matpower.

  • 22.
    Farrokhseresht, Nakisa
    et al.
    KTH.
    Chavez, H.
    Hesamzadeh, Mohammad Reza
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Economic impact of wind integration on Primary Frequency Response2015In: 2015 IEEE Eindhoven PowerTech, PowerTech 2015, IEEE conference proceedings, 2015Conference paper (Refereed)
    Abstract [en]

    In order to have a reliable and secure power system, frequency stability should be guaranteed. Primary Frequency Response (PFR) is used to arrest the frequency deviation upon a contingency. The significant penetration of wind generation in power grids has negative effect on the PFR, as the contribution of wind machines to the total system inertia is low and classical wind turbines do not have PFR capabilities. This study uses two metrics of frequency control, ROCOF and frequency Nadir to analyze the cost increase for maintaining adequacy in the presence of wind power. The Nordic 32-A test grid, representing the Swedish grid is used as case study on which the method is applied.

  • 23. Hagh, M. T.
    et al.
    Manesh, A. S.
    Hesamzadeh, Mohammad
    CQ University, Australia.
    Improvement of load bus voltages considering the optimal dispatch of active and reactive powers2008In: Proceedings of the Universities Power Engineering Conference, Padova, 2008Conference paper (Refereed)
    Abstract [en]

    This paper presents a simultaneous active and reactive power/voltage dispatch methodology using a mixture of continuous and discrete control variables. The continuous control variables are active power and reactive power/voltage magnitudes of generator buses, while the discrete ones are transformer-tap settings. The Lambda iteration based economic dispatch is used to minimize the fuel cost and active power dispatch among the generators. During this process, the voltage magnitude of load buses may move away from the desired value. The genetic algorithm is applied for optimal reactive power/voltage dispatch among generators and determination of tap settings of under load tap changers (ULTCs). This results in globally improvement of voltage regulation of load buses. Considering the fact that the reactive power/voltage of generators are continuous variables while the transformer tap settings are discrete variables, a method is proposed to combine these variables into one suitable chromosome. The IEEE 30-bus test system is used to illustrate the effectiveness and feasibility of proposed approach.

  • 24. Hamideh, J.
    et al.
    Hesamzadeh Hejazi, S. M.
    Research Institute of Forests and Rangelands, Tehran, Iran.
    Babayev, M. S.
    Karyotypic studies of three Thymus (Lamiaceae) species and populations in Iran2009In: Caryologia (Firenze), ISSN 0008-7114, E-ISSN 2165-5391, Vol. 62, no 4, 316-325 p.Article in journal (Refereed)
    Abstract [en]

    Karyotypes of three taxa (seven populations) of the genus Thymus from different geographic origins is presented. The secondary basic numbers in all populations was x= 15 that probably originate from a basic number x=7.The ploidy levels were different among populations belongs to T. daenensis and T. kotschyanus species (2x and 4x). Detailed karyotype analysis allows us to group the different populations and to postulate relationships among them.

  • 25.
    Hesamzadeh, Mohammad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    The economic analysis of transmission investment policies2011In: 2011 8th International Conference on the European Energy Market, EEM 11, Zagreb, 2011, 501-506 p.Conference paper (Refereed)
    Abstract [en]

    This paper defines and discusses three types of benefits for economic analysis of transmission investment policies. These benefits are termed (1) The Efficiency Benefit, (2) The Static Competition Benefit, and (3) The Dynamic Competition Benefit. To provide more insights to these benefits, an example system is studied. The results show that a transmission network service provider can and should use the transmission investment policies to improve the competition (static and dynamic) in the supply electricity industry. Further research is necessary to model the static and dynamic competition benefit in the process of transmission expansion planning.

  • 26. Hesamzadeh, Mohammad
    et al.
    Abrishami, A.
    Hosseinzadeh, N.
    Wolfs, P.
    A novel modeling approach for exploring the effects of UPFC on restructured electricity market2007In: 2007 CONFERENCE PROCEEDINGS IPEC, 2007, 437-442 p.Conference paper (Refereed)
    Abstract [en]

    A new steady state modeling of unified power flow controller (UPFC) is proposed in this paper. Using this model, factors that affect the objective function of electricity market as a result of UPFC installation in power grid has been decomposed into four components, including line series impedance increase, shunt reactive power compensation, inphase component of series voltage and quadrature component of series voltage. A UPFC has been placed in different points of a test system and impact of each component on objective function of electricity market has been measured by simulation and compared with results from analytical method. Both active and reactive power spot prices are calculated and their relation with settings of UPFC series part has been studied. Also, numerical results shows that the necessary cost to improve security of electricity market decreases by UPFC installation.

  • 27.
    Hesamzadeh, Mohammad
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Amelin, Mikael
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    A generation expansion planning model of a strategic electricity generating firm2011In: Power and Energy Society General Meeting, 2011 IEEE, IEEE , 2011, 1-7 p.Conference paper (Refereed)
    Abstract [en]

    This paper derives a mathematical structure for investment decisions of a profit-maximising and strategic producer in liberalised electricity markets. The paper assumes a Cournot producer in an energy market with nodal pricing regime. The Cournot producer is assumed to have revenue from selling energy to the pool. The investment problem of the strategic producer is modelled through a leader-follower game in applied mathematics. The leader is the strategic producer seeking the optimal mix of its investment technologies and the follower is a stochastic estimator. The stochastic estimator forecasts the reactions of other producers in the market in response to the investment decisions of the producer in question. The stochastic estimator takes the investment decisions of the producer and it calculates the stochastic prices. The mathematical structure is a stochastic linear bilevel programming problem. This problem is reformulated as a stochastic MILP problem which can be solved using the commercially available software packages. Finally, the developed mathematical structure is applied to a six-node example system to highlight the strengths of the whole approach.

  • 28.
    Hesamzadeh, Mohammad
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Amelin, Mikael
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Assessment of the market power cost in liberalised electricity markets using SMPI, PMPI, and NMPI indicators2011In: Energy Market (EEM), 2011 8th International Conference on the European, 2011, 844-848 p.Conference paper (Refereed)
    Abstract [en]

    Market power analysis is one of the major issues facing regulators of wholesale electricity markets. The exercise of market power both distorts wholesale price signals and reduces the efficiency of the operation of and investment in the wholesale electricity market. This paper deals with a systematic way for quantifying and visualising market power. The paper first proposes three indicators termed the System Market Power Indicator, SMPI, the Producer Market Power Indicator, PMPI, and the Nodal Market Power Indicator, NMPI. The game theory in applied mathematics and the concept of social welfare in microeconomics are used in formulating of these indicators. The SMPI finds the total cost of exercising market power by generating companies. The contribution of a specific generating company in system market power is calculated using the PMPI. The NMPI finds the contribution of each power system node in the total market power cost. Then after, a colour contour map is used to visualise the exercise of market power and its associated cost. The proposed market power indicators are applied to the modified Garver’s example system to show the promising performance of these indicators.

  • 29.
    Hesamzadeh, Mohammad
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Amelin, Mikael
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Modelling market power cost in the assessment of transmission investment policies2011In: PowerTech, 2011 IEEE Trondheim, 2011, 1-6 p.Conference paper (Refereed)
    Abstract [en]

    This paper develops a mathematical tool for modelling market power cost in transmission expansion planning decisions. The mathematical modelling is based on the game theory in applied mathematics and the concept of social welfare in microeconomics. We assume the generating companies as Cournot players and the Transmission System Operators as a regulated social transmission planner. To tackle the multiple Nash equilibria problem, the concept of worst-Nash equilibrium is defined and mathematically formulated. The developed mathematical structure is a mixed-integer linear programming problem. This closed form mathematical structure can be solved efficiently using the available computational packages.

  • 30. Hesamzadeh, Mohammad
    et al.
    Biggar, D.
    Hosseinzadeh, N.
    Wolfs, P. J.
    Derivation of a mathematical structure for market-based transmission augmentation in oligopoly electricity markets using multilevel programming2009In: 2009 IEEE Power and Energy Society General Meeting, PES '09, Calgary, AB, 2009Conference paper (Refereed)
    Abstract [en]

    In this paper, we derive and evaluate a new mathematical structure for market-based augmentation of the transmission system. The closed-form mathematical structure can capture both the efficiency benefit and competition benefit of the transmission capacity. The Nash solution concept is employed to model the price-quantity game among GenCos. The multiple Nash equilibria of the game are located through a characterisation of the problem in terms of minima of the function. The worst Nash equilibrium is used in the mechanism of transmission augmentation. The worst Nash equilibrium is defined as the one which maximises the social cost, total generation cost + total value of lost load. Thorough analysis of a simple three-node network is presented to clearly highlight the mechanism of the derived mathematical structure from different perspectives.

  • 31. Hesamzadeh, Mohammad
    et al.
    Biggar, D. R.
    Hosseinzadeh, N.
    Wolfs, P. J.
    Economic transmission augmentation with explicit modeling of the competition benefit2010In: IEEE Transactions on Power Systems, ISSN 0885-8950, Vol. 25, no 3, 1714-1721 p.Article in journal (Refereed)
    Abstract [en]

    This paper derives and evaluates a mathematical structure for identifying economically-efficient transmission augmentations. The mathematical structure is based on the concepts of sequential-move and simultaneous-move games in applied mathematics. The Nash equilibrium solution concept has been reformulated as an optimization problem in the proposed structure. The problem of multiple Nash equilibria is managed by introducing the concept of the worst-case Nash equilibrium. Both the economic concepts of the "efficiency benefit" and "competition benefit" of the transmission capacity are explicitly modeled in the proposed structure. A simple three-bus example system and Garver's example system are employed and modified to suit the purpose of analysis. A thorough economic study of these example systems is presented to highlight the concept and operation of the proposed mathematical structure from different perspectives. The results demonstrate the utility of the proposed structure for measuring the total economic efficiency benefit of additional transmission capacity.

  • 32. Hesamzadeh, Mohammad
    et al.
    Biggar, D. R.
    Hosseinzadeh, N.
    Wolfs, P. J.
    The nodal market power index (NMP Index) for modelling and visualising market power2010In: IEEE PES General Meeting, PES 2010, Minneapolis, MN, 2010Conference paper (Refereed)
    Abstract [en]

    This paper deals with a systematic way for modelling and visualising market power in liberalised electricity markets. The paper first introduces a new index termed the "Nodal Market Power" index, the NMP index. The NMP index is calculated based on the concept of "social welfare" in economics and the game theory in applied mathematics. The oligopoly electricity market is modelled through a non-cooperative game and the solution concept of the Nash equilibrium. The solution concept of Nash equilibrium is reformulated as an optimisation problem. To tackle the multiple Nash equilibria problem, the worst Nash equilibrium in terms of the social cost to the society is selected. Then after, the NMP index is calculated for each node of power system. A colour contour map is used for visualising the market power using the NMP index.

  • 33.
    Hesamzadeh, Mohammad
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Biggar, D. R.
    Hosseinzadeh, N.
    Wolfs, P. J.
    Transmission augmentation with mathematical modeling of market power and strategic generation expansion - Part I2011In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, ISSN 0885-8950, Vol. 26, no 4, 2040-2048 p.Article in journal (Refereed)
    Abstract [en]

    This paper proposes a new mathematical structure for evaluating the economic efficiency of transmission investment in a liberalized electricity market. The problem faced by a transmission planner is modeled using the concept of social welfare from economics. The behavior of generators is modeled as the Nash equilibrium of a strategic game. The Nash solution concept is reformulated as an optimization problem and a new concept - the Stackelberg-Worst Nash equilibrium - is introduced to resolve the problem of multiple equilibria. The proposed structure can take into account the effects of a transmission augmentation on both market power and strategic generation investment. Accordingly, the optimal solution to the transmission planner's problem may allow additional transmission capacity both to reduce market power and to defer investment in the generation sector. A methodology is proposed to decompose the benefits of a transmission augmentation policy into the efficiency benefit, competition benefit, and the deferral benefit. The outcomes of the proposed approach to transmission augmentation are compared with the outcomes of two other approaches to transmission augmentation using a simple three-bus network example.

  • 34.
    Hesamzadeh, Mohammad
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Biggar, D. R.
    Hosseinzadeh, N.
    Wolfs, P. J.
    Transmission augmentation with mathematical modeling of market power and strategic generation expansion - Part II2011In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, ISSN 0885-8950, Vol. 26, no 4, 2049-2057 p.Article in journal (Refereed)
    Abstract [en]

    This paper describes a numerical approach to solving the mathematical structure proposed in the first part of this paper. The numerical approach employs a standard genetic algorithm (GA) embedded with an island parallel genetic algorithm (IPGA). The GA handles the decision variables of the transmission network service provider, (TNSP) while the IPGA module finds the equilibrium of the electricity market. The IPGA module uses the concept of parallel islands with limited communication. The islands evolve in parallel and communicate with each other at a specific rate and frequency. The communication pattern helps the IPGA module to spread the best-found genes across all isolated islands. The isolated evolution removes the fitness pressure of the already-found optima from the chromosomes in other islands. A stability operator has been developed which detects stabilized islands and through a strong mutation process re-employs them in exploring the search space. To improve the efficiency of the proposed numerical solution, two high performance computing (HPC) techniques are used - shared-memory architecture and distributed-memory architecture. The application of the proposed approach to the assessment of transmission augmentation is illustrated using an IEEE 14-bus example system.

  • 35.
    Hesamzadeh, Mohammad
    et al.
    Central Queensland University, Power Engineering Group, Rockhampton, QLD, Australia .
    Hosseinzadeh, N.
    Wolfs, P.
    An advanced optimal approach for high voltage AC bushing design2008In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, ISSN 1070-9878, Vol. 15, no 2, 461-466 p.Article in journal (Refereed)
    Abstract [en]

    This paper proposes a new and advanced methodology for finding the optimum electrical design of high voltage ac capacitive graded bushings using an improved genetic algorithm approach as an effective meta-heuristic method. A case study has been conducted on a 145 kV oil impregnated paper (OIP) bushing and the IEC 60137 tests have been performed to evaluate its performance. Condenser-bushings contain concentric conductive foils which are isolated from each other. The partial capacitances between conducting cylinders can be modified by adjusting the number, diameter, place and length of these cylinders as well as the thickness of insulating material between foils. As a result, the voltage drop and also the electrical stress in the core and along the surface will change. This paper finds optimal value of bushing design parameters to achieve well-distributed electric stress with the lowest possible maximum value and also a constant voltage drop for different layers by using an improved genetic algorithm optimization method subject to practical and technological constrains. The proposed method of this research work has been applied to a 145 kV OIP bushing. The performance of optimal designed 145 kV OIP bushing under IEC 60137 tests is very promising.

  • 36.
    Hesamzadeh, Mohammad
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hosseinzadeh, N.
    Wolfs, P. J.
    A bi-level formulation of transmission planning problem in liberalised electricity markets2011In: Australian Journal of Electrical and Electronics Engineering, ISSN 1448-837X, Vol. 8, no 2, 119-128 p.Article in journal (Refereed)
    Abstract [en]

    This paper sets out an alternative formulation for transmission planning in liberalised electricity markets. The formulation follows the concept of the leader-follower game in applied mathematics. In this neio formulation, the transmission network service provider acts as the leader of the game and the electricity market operator acts as the follower of the game. Using this new formulation, the transmission network service provider can measure the impact of additional transmission capacity on nodal (or regional) market prices. This allows the transmission network service provider to implicitly model the competitive effect of additional transmission capacity in its investment decisions. A metric termed L-Shape Area is developed to measure the deviation of market prices from the competitive ones. The alternative formulation is a bi-level optimisation problem. To solve this problem, the inner optimisation problem is replaced by its equivalent Karush-KuhnTucker optimality conditions. The result is a non-linear programming problem that is solved using a gradient search method. IEEE 14-bus example system is used for numerical studies.

  • 37. Hesamzadeh, Mohammad
    et al.
    Hosseinzadeh, N.
    Wolfs, P. J.
    A leader-followers model of transmission augmentation for considering strategic behaviours of generating companies in energy markets2010In: International Journal of Electrical Power and Energy Systems, ISSN 0142-0615, Vol. 32, no 5, 358-367 p.Article in journal (Refereed)
    Abstract [en]

    This paper suggests an integrated mathematical framework developed based on the leader-followers game for augmentation of transmission networks. Transmission Network Service Provider moves first and designs the horizon year transmission system. Generating Companies compete for having the highest share from the energy market and they find their equilibrium point using the Nash equilibrium concept. Finally, Market Management Company receives the planning schedule of transmission system and the energy offer prices and clears the market. In addition to the exact mathematical modelling of the interested players of transmission planning problem, the methodology can design the future transmission system not only for improving the system social welfare but also for encouraging competition among horizon year generating companies.

  • 38.
    Hesamzadeh, Mohammad
    et al.
    Central Queensland University, Rockhampton, QLD, Australia .
    Hosseinzadeh, N.
    Wolfs, P. J.
    A market-based heuristic algorithm for the expansion planning of the high voltage transmission systems2008In: International Review of Electrical Engineering, ISSN 1827-6660, ISSN 1827-6660, Vol. 3, no 2, 233-241 p.Article in journal (Refereed)
    Abstract [en]

    The worldwide trend for the restructuring of electric industry has caused dramatic changes in operation and planning procedures of the power system. Under the restructured electricity market environment, identifying a minimum-cost plan under particular constraints is not sufficient anymore and other aspects such as market efficiency and environmental concerns are of equal importance. In this context, network augmentation plays a vital role in providing a full competitive environment for market players. This paper presents a novel forward heuristic algorithm to select the most effective expansion options based on a set of market-based and reliability-based sensitivity indices. These indices are used for multi-evaluation of each transmission option from the viewpoint of electricity market and reliability criteria. The proposed method has been applied on a 6-bus test system for verifying its effectiveness.

  • 39.
    Hesamzadeh, Mohammad
    et al.
    Central Queensland University.
    Hosseinzadeh, N.
    Wolfs, P. J.
    A multi-criteria decision framework for optimal augmentation of transmission grid - Addressing a tool for sensitive zone detection in electricity market2008In: International Journal of Emerging Electric Power Systems, ISSN 2194-5756, E-ISSN 1553-779X, Vol. 9, no 4Article in journal (Refereed)
    Abstract [en]

    Transmission system structure has an essential effect on the reliability of the power system and electricity market performance, especially when producers bid strategically. As part of on-going research on the design of a robust algorithm for expansion planning of the transmission grid in the Australian electricity market, this paper presents a framework which addresses: (1) the security of power delivery to the load points of the transmission system in case of single line outages; (2) the minimization of transmission system lost load; (3) an efficient electricity market for market participants; (4) construction and maintenance costs of transmission augmentation options; and (5) operation efficiency of the transmission grid. The suggested algorithm benefits from the dynamic programming and sensitivity analysis approaches along with the aggregation method in its multi-criteria decision-making to locate the optimum configuration of a future transmission system. A set of indices, which account for impacts of the augmentation options of the transmission grid on five aforementioned reliability and market criteria, are proposed and used in the optimum framework for expansion planning of the transmission grid. Although the methodology is promising for expansion planning of the transmission system, considering the sensitivity analysis concept employed, the proposed methodology would be suitable to detect the sensitive areas of the transmission system to be expanded. The tool would be very useful in the case of large scale power systems for a smart reduction of the transmission expansion options. The proposed methodology has been applied to a 6-bus and a modified IEEE 30-bus test system to show the effectiveness of the sensitivity-based algorithm.

  • 40.
    Hesamzadeh, Mohammad
    et al.
    Central Queensland University.
    Hosseinzadeh, N.
    Wolfs, P. J.
    A multi-criteria decision framework for optimal augmentation of transmission grid: addressing a tool for sensitive zone detection in electricity market2008In: Proceedings of the 10th IASTED International Conference on Power and Energy Systems, PES 2008, Baltimore, MD, 2008, 242-248 p.Conference paper (Refereed)
    Abstract [en]

    Transmission system structure under pool model of electricity market has an essential effect on the reliability and electricity market performance, especially when producers bids strategically. As a part of an on-going research on the design of a robust algorithm for expansion planning of transmission grid in the Australian electricity market, this paper presents a framework which addresses; (1) Security of power delivery to the load points of transmission system in case of single line outages, (2) Minimization of transmission system lost load, (3) Providing full competitive electricity market for market participants, (4) Construction and maintenance costs of transmission augmentation options, (5) Operation efficiency of transmission grid, in its planning procedure. The suggested algorithm benefits from the dynamic programming and sensitivity analysis approaches along with aggregation method in its multi criteria decision making to locate the optimum configuration of future transmission system. A set of indices that account for impacts of the augmentation options of the transmission grid on five aforementioned reliability and market criteria, are proposed and used in the optimum framework for expansion planning of the transmission grid. Although the methodology is promising for expansion planning of the transmission system and considering the sensitivity analysis concept employed, the proposed methodology would be able to detect the sensitive areas of the transmission system to be expanded. The tool would be very useful in the case of large scale power systems for a smart reduction of the power system. The proposed methodology is applied to a 6 bus and a modified IEEE 30 bus test system to show the effectiveness of the sensitivity based algorithm.

  • 41. Hesamzadeh, Mohammad
    et al.
    Hosseinzadeh, N.
    Wolfs, P. J.
    Derivation of a new mathematical framework for transmission system augmentation using von stackelberg game2008In: Proceedings of the Universities Power Engineering Conference, Padova, 2008, 529-534 p.Conference paper (Refereed)
    Abstract [en]

    The market-based augmentation of the high voltage transmission systems as a legacy of the previous regulated regimes has been a challenging issue for the central transmission entities. The economic assessment framework for transmission upgrades or expansion projects, considering the interaction of the central transmission entity (CTE) with the electricity market management (MMC) company both as independent players needs to be addressed appropriately at least in the National Electricity Market, Australia. To assist in bridging this gap, this paper introduces a novel metric, namely, the L-Shape Area, for the economic assessment of the transmission expansion options. The proposed methodology employs a von Stackelberg game for the interaction modelling of the central transmission entity and the market management company. The upper subproblem minimises the objective of the CTE as the leader player and the lower subproblem solves the security-constrained economic dispatch as the follower subproblem. The bi-level programming problem has been solved by applying the Kuhn-Tucker optimality conditions to the follower subproblem and the use of a gradient search method to solve the resultant single level non-linear programming problem. A modified IEEE 14-bus test system has been used to show the effectiveness of the proposed formulation.

  • 42. Hesamzadeh, Mohammad
    et al.
    Hosseinzadeh, N.
    Wolfs, P. J.
    Design and study of a switch reactor for central queensland SWER system2008In: Proceedings of the Universities Power Engineering Conference, Padova, 2008, 261-265 p.Conference paper (Refereed)
    Abstract [en]

    Single Wire Earth Return (SWER) systems are a widely applied, low cost electrification method used in many rural areas. In Central Queensland a single SWER system supplying approximately 10OkW may extend more than 300km. Many SWER systems include shunt reactors to control the effects of the line charging capacitance. One effect, the Ferranti effect, causes the line voltage to rise with the distance. In three phase distribution systems this effect is not visible but in SWER systems, this effect makes it difficult to maintain the consumers supply within the acceptable regulation range. As the second effect, the loading of the SWER system supply transformer increases. Controllable shunt reactors are used as one solution to the aforementioned problems. Stanage Bay feeder in Central Queensland area has been chosen for the installation of the designed shunt reactor. Stange Bay feeder is supplied by an isolating transformer with the total capacity of 150kVA and the voltage level of 22kV. Using the Stanage Bay feeder, this paper details the process of design and simulation of a suitable switch reactor. This step has been carried out by firstly, the design of the switch reactor and secondly, the proper modelling of the designed reactor for the voltage regulation studies.

  • 43.
    Hesamzadeh, Mohammad
    et al.
    CQ University, Australia.
    Hosseinzadeh, N.
    Wolfs, P. J.
    Economic assessment of transmission expansion projects in competitive electricity markets - an analytical review2008In: Proceedings of the Universities Power Engineering Conference, Padova, 2008Conference paper (Refereed)
    Abstract [en]

    Restructuring of the electricity market has changed many aspects of the transmission system operation and planning. Reliability-Driven and Economic-Driven transmission expansion planning by regulated and private utilities are the substitutes of the traditional Cost-Driven transmission expansion planning. Reliability-based criteria for assessment of the transmission projects are almost well-developed while there exists a lack of a comprehensive framework for the economic evaluation of the transmission projects. Definition of a quantitative and monetary framework for economic evaluation of future transmission projects demands a detailed market analysis. In addition, specific characteristics and responsibilities of the transmission system in the open access structure must be understood comprehensively. To reaching the aforementioned goal, an analytical review on the existing economic assessment methodologies would be highly beneficial for the researchers in this area. Moreover, most of the review literatures on transmission investment in competitive electricity markets are general. These review literatures have tried to address all aspects of this challenging issue with devoting only few paragraphs to economic assessment of transmission projects. Given the aforementioned shortcomings, this article would bridge the gap by the following contributions: Firstly, reviewing available approaches for economic assessment of transmission projects based on research papers and industrial reports ,Secondly, analysing the reviewed criteria critically by applying them to a modified Wood and Wollenberg 6-bus case study and Finally, summarizing the key components of a successful Economic Assessment Framework for transmission expansion or upgrade projects. Practical experiences of California Electricity Market, New England Electricity Market, Pennsylvania, New Jersey, and Maryland (PJM) and National Electricity Market, Australia have been accommodated in the article.

  • 44. Hesamzadeh, Mohammad
    et al.
    Hosseinzadeh, N.
    Wolfs, P. J.
    Security constrained augmentation for transmission system considering preferences of market players on expansion options2007Conference paper (Refereed)
    Abstract [en]

    This paper presents a new approach for transmission expansion planning in unbundled electricity industry. The approach considers the power market and technical criteria for selecting the most effective expansion options. Perfect competition, a stable electricity market, and a lower price of electricity at different market players' locations have been addressed in the proposed methodology. Reliability criteria have been considered in terms of transmission system security and sustainable load serving. To consider the preferences of market players for different expansion options, firstly, importance degree of market players are determined based on a digitised band. Then a fuzzy linguistic variable is assigned to the preference of each market player to the transmission options. Finally, the quantified linguistic variables are used to weight planning criteria and select the final plan. The results of applying the proposed methodology to the introduced case study are very promising.

  • 45. Hesamzadeh, Mohammad
    et al.
    Hosseinzadeh, N.
    Wolfs, P. J.
    Sensitivity based procedures for short term augmentation of transmission system in restructured electricity market2008In: IEEE Power and Energy Society 2008 General Meeting: Conversion and Delivery of Electrical Energy in the 21st Century, PES, Pittsburgh, PA, 2008Conference paper (Refereed)
    Abstract [en]

    Transmission network was recognized as natural monopoly and almost everywhere subject to some kind of regulation in a restructured electricity market. The role of the transmission system is to provide an indiscriminate access for all market players along with an acceptable level of reliability and security. Regulating authorities have to decide about the augmentation investment. As an on going research on forming a robust algorithm for the expansion planning of transmission system in Queensland State, Australia, this paper presents two procedures for the quasi-optimal short-term augmentation of the transmission system. The proposed approaches can accommodate (1) Security of the power delivery to the load points of the transmission system in terms of single line outages (2) Minimization of the transmission system lost load (3) Providing full competitive electricity market for market participants (4) Construction and maintenance costs of transmission augmentation options and (5) Operation efficiency of the transmission grid in their planning frameworks. Each expansion option of the transmission system is evaluated by the aforementioned criteria through designation of a set of indices. The proposed procedures benefits from the concepts of the sensitivity analysis and dynamic programming as well as aggregation method, weighted sum function, in their multi-criteria decision making. The introduced procedures are very promising in case of short term expansion planning of the transmission system. Considering the sensitivity analysis concept employed, in case of long term planning the method is appreciable in smart detection of the suitable zones for expansion. The procedures would be very useful in case of large scale power systems. A 6 bus test system and modified IEEE 30 bus test system are used to validate the effectiveness of the proposed procedures.

  • 46. Hesamzadeh, Mohammad
    et al.
    Hosseinzadeh, N.
    Wolfs, P. J.
    Transmission augmentation in an oligopoly electricity market: Part I (mathematical formulation)2008In: 2008 Australasian Universities Power Engineering Conference, AUPEC 2008, Sydney, NSW, 2008Conference paper (Refereed)
    Abstract [en]

    This paper proposes a Three-Stage Model for transmission augmentation in restructured electricity markets. The mathematical formulation of the model is eveloped based on the game theory. Transmission Network Service Provider, TNSP, Generating Companies, GenCos, and Market Management Company, MMC, are placed in different stages of the model. These stages are linked to each other using the Leader-followers game and the concept of Nash equilibriums. An increase in transmission capacity can have two benefits for the electricity market; firstly, efficiency benefit in terms of improving the social welfare of the electricity industry, and, secondly, competition benefit which leads to increasing competition among generating companies. The introduced Three-Stage Model can capture both benefits of transmission projects in electricity markets. An effective numerical method is designed for solving the developed Three-Stage Model. A modified IEEE 14 example system is employed to show the effectiveness of the methodology. This paper has been organized in two parts. First part deals with the mathematical formulation of the algorithm and second part deals with the numerical studies. What follows is the first part of the paper.

  • 47.
    Hesamzadeh, Mohammad
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hosseinzadeh, N.
    Wolfs, P. J.
    Transmission augmentation with the competition benefit modelling of additional transmission capacity2011In: Australian Journal of Electrical and Electronics Engineering, ISSN 1448-837X, Vol. 8, no 2, 105-118 p.Article in journal (Refereed)
    Abstract [en]

    Additional transmission capacity can improve the performance of the electricity market from two perspectives: firstly, efficiency benefit in terms of improving the social welfare of the electricity industry; and, secondly, competition benefit that leads to increasing competition among generating companies. This paper introduces an algorithm to model both the efficiency and competition benefits of additional transmission capacity in the process of transmission augmentation. The economic mathematical model is developed based on game theory in applied mathematics and the concept of social welfare in microeconomics. Transmission network service providers, generating companies and market management companies are placed in different stages of the developed model. The multiple Nash equilibria problem is tackled through the introduced concept of worst-Nash equilibrium. A numerical algorithm is designed to solve the developed model. The Garver's and IEEE 14-bus example systems are carefully modified to suit the purpose of this study; the former is used for conceptual evaluation of the algorithm, and the latter for testing the developed numerical solution. The results show that the proposed approach can improve the efficiency of the electricity market and reduce the market power in the generation sector using the transmission augmentation policies.

  • 48.
    Hesamzadeh, Mohammad
    et al.
    Swinburne University of Technology, Australia.
    Hosseinzadeh, N.
    Wolfs, P. J.
    Transmission System Augmentation Based on the Concepts of Quantity Withheld and Monopoly Rent for Reducing Market Power2010In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, ISSN 0885-8950, Vol. 25, no 1, 167-180 p.Article in journal (Refereed)
    Abstract [en]

    This paper proposes two mathematical structures for considering the market power effect of transmission capacity in transmission augmentation assessment. These mathematical structures use the concepts of monopoly rent and quantity withheld in economics for market power modeling in the assessment process of transmission augmentation. The simultaneous-move and sequential-move games in applied mathematics are used to model the interactions of the transmission network service provider, generating companies, and the market management company in the proposed mathematical structures. The solution concept of Nash equilibria is reformulated as an optimization problem, and the multiple Nash equilibria is tackled through an introduced concept termed worst Nash equilibrium. A numerical solution is developed to solve the proposed mathematical structures. The numerical solution is an island parallel genetic algorithm nested in a standard genetic algorithm. The six-bus Garver's example system and the IEEE 14-bus test system are modified and studied. The results prove the strong mechanism of the developed structures for modeling the market power effect of transmission capacity in the assessment of transmission augmentation.

  • 49.
    Hesamzadeh, Mohammad R.
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Biggar, D. R.
    Computation of extremal-nash equilibria in a wholesale power market using a single-stage MILP2012In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, Vol. 27, no 3, 1706-1707 p.Article in journal (Refereed)
    Abstract [en]

    This letter proposes a new approach to the computation of extremal-Nash equilibria in a wholesale power market with transmission constraints. The approach uses linearization techniques to formulate the extremal-Nash equilibrium problem as a single-stage mixed-integer linear programming problem which can be solved with standard software. Through the introduced concept of extremal-Nash equilibria, the derived structure can efficiently locate all Nash equilibria of the game. We show that this approach offers significant performance improvements over existing approaches to computing Nash equilibria.

  • 50.
    Hesamzadeh, Mohammad R.
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Biggar, Darryl R.
    Hosseinzadeh, N.
    The Application of High Performance Computing Technologies in Studying the Strategic Behaviours of Electricity Market Players2011In: Advances in Energy Research, New York: Nova Science Publishers, Inc., 2011, 507-523 p.Chapter in book (Refereed)
123 1 - 50 of 121
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf