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  • 1. Bayona, Jhon F.
    et al.
    Chamorro, Harold R.
    KTH.
    Sanchez, Andres C.
    Aguillon-Garcia, Jacobo
    Rubio, Diego A.
    A High Efficiency Fluorescent Lamp Electronic Ballast Design2016In: IEEE CACIDI 2016 - IEEE Conference on Computer Sciences, Institute of Electrical and Electronics Engineers (IEEE), 2016, article id 7786005Conference paper (Refereed)
    Abstract [en]

    This paper presents the design and implementation of an electronic ballast for powering a fluorescent lamp. The purpose of this work is to improve the efficiency of the ballast by implementing a Series Resonant Inverter (SRI) in half-bridge configuration instead classic Series-Parallel Resonant (SPRI); in order to allow to provide the voltage steady state of the lamp. By other hand, this DC-AC converter will supply the voltage lamp ignition. Results on the proposed experimental prototype, using a fluorescent lamp of 32W, shows a better efficiency compared to traditional SPRI configurations.

  • 2. Bayona, Jhon F.
    et al.
    Chamorro, H.R.
    KTH.
    Sanchez, Andres C.
    Aguillon-Garcia, Jacobo
    Rubio, Diego A.
    Linear Control of a Power Factor Correction Rectifier in Half-bridge Configuration2016In: IEEE CACIDI 2016 - IEEE CONFERENCE ON COMPUTER SCIENCES, IEEE, 2016Conference paper (Refereed)
    Abstract [en]

    This paper presents a detailed analysis of a single phase high power factor boost half-bridge rectifier (RPFU-HBB). The purpose of this work is to achieve a unity power factor with tight-regulated output voltage. Using the experimental prototype for 120 Vrms input voltage, output power 80W and output voltage of 450V; a power factor of 0.99 and total harmonic distortion of 2.5% was obtained. In order to eliminate the unbalance voltage of the two output capacitors a special control scheme was developed. Modeling, theoretical linearization around the operating point of the RPFU-HBB, design considerations of the current controller output voltage by means of average current method and experimental work tested through simulation model RPFU-HBB are presented.

  • 3.
    Chamorro, Harold
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    The Impact of Non-synchronous Generation on Power Systems Dynamics2015Licentiate thesis, monograph (Other academic)
    Abstract [en]

    Due to the increasing integration of Renewable Energy Sources (RES), and the installation of High Voltage Direct Current (HVDC) systems, more power is injected to the AC grid based on power electronic converters. This kind of power injection is called non-synchronous generation in this thesis.

    However, non-synchronous generation does not provide the inherent dynamical support to the system as a synchronous generator does. Thereby, the large inclusion of non-synchronous generation significantly affects the dynamics of the power system. This thesis analyses different aspects of the power system dynamics with the non-synchronous generation integration such as system frequency response, inertia and undamped oscillations.

    Initially, a theoretical frame is presented which deals with the basic concept of frequency response in power systems, the modal analysis, the Trajectory Sensitivity Analysis (TSA), Multi-Prony Analysis (MPA) and $Koopman$ Mode Analysis (KMA). The first dynamic aspect studied is the frequency response evaluating some indicators under the gradually increasing installation of non-synchronous generation. The second one, is the impact of non-synchronous generation on the Small Signal Stability (SSS). The analysis is emphasised in the dominant modes. Eigenvalues, mode shapes displacements and participation factors variations are analysed showing the changes during the gradually integration of non-synchronous generation.

    Furthermore, a second method for frequency mode estimation is applied which relies on on-line modified Prony method. The monitoring of the transient signals provides the observation of the frequency and damping modes from the simulation data measurements based on MPA. The impact on coherency is also shown through the application of KMA. To get the coherent groups it is used the so-called $Koopman$ operator, which is a based-measurements method. This method identifies and clusters the groups based on the spectral decomposition of Koopman modes. The groups obtained while the non-synchronous generation integration are shown. From the results it is shown that the non-synchronous generation inclusion effectively change the coherency in the test system. The test system, the Nordic32, is presented and the set-up scenarios are given. Finally, the TSA, which provides the sensitivity of power system trajectories with respect to the inertia is applied to another test system (IEEE 39) to show the impact of the inertia reduction on transient stability.

  • 4.
    Chamorro, Harold
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Ghandhari, Mehrdad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Eriksson, Robert
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Influence of the Increasing Non-Synchronous Generation on Small Signal Stability2014In: 2014 IEEE PES General Meeting | Conference & Exposition, IEEE conference proceedings, 2014, p. 6938796-Conference paper (Refereed)
    Abstract [en]

    The increasing installation of aggregated renewable generation based Full Rated Converters (FRC) in current power systems is modifying their dynamic characteristics. This paper analyses the influence of large scale inclusion of non-synchronous generation through back-to-back Voltage Source Converters’(VSC) connection on power systems, by presenting the dynamic changes on inter-area oscillations in different penetration level cases. The aggregated model of VSC units is assumed. The Small Signal Stability Analysis (SSSA) is used to show thedynamic behaviour and presents the performance of the power systems related to the domain frequency modes in a test grid system. From the analysis, it is shown that the mode shapes and participation factors are displaced according to the penetration levels. Eigenvalue sensitivity analysis according to the inertia isalso applied, showing the impact of the large penetration of nonsynchronousgeneration.

  • 5.
    Chamorro, Harold
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Ghandhari, Mehrdad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Eriksson, Robert
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Wind Power Impact on Power System Frequency Response2013In: 45th North American Power Symposium, NAPS 2013, IEEE , 2013, p. 6666880-Conference paper (Refereed)
    Abstract [en]

    The use of high power electronics in the large scale integration of wind power in the transmission and distribution systems can affect the system inertia response and the ability to recover frequency stability after large disturbances. Different approaches have been presented to show the system dynamic behaviour, and to quantify the wind power impact on the system inertial and frequency response. This paper gives a short overview of studies performed regarding the system inertia issues under high penetrations of wind power. Also, it presents the results of a case study to show how the system inertia can be affected by high penetrations of wind power.

  • 6.
    Chamorro, Harold R.
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Malik, Naveed
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Gonzalez-Longatt, F.
    Sood, V. K.
    Evaluation of the synthetic inertia control using active damping method2017In: 2017 6th International Conference on Clean Electrical Power: Renewable Energy Resources Impact, ICCEP 2017, Institute of Electrical and Electronics Engineers (IEEE), 2017, p. 269-274, article id 8004826Conference paper (Refereed)
    Abstract [en]

    The current and massive deployment of non-synchronous generation is degrading the inertial response in power systems. The addition of an extra control loop, the so-called synthetic inertia, can contribute in the improvement of the frequency response, through an additional power injection. In this paper, the active damping method is used to enhance both, the closed-loop current control and the synthetic inertia control loop. A full aggregated model of a wind turbine generator (WTG) is integrated in a test system. The results obtained show an increase in the power injected into the grid, thereby improving the frequency response after a frequency disturbance. Moreover, the response of the closed current-control loop and voltage loop are presented, in order to show their interaction with the synthetic inertia control.

  • 7.
    Chamorro, Harold R.
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Nazari, Mohammad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Babazadeh, Davood
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Malik, Naveed ur Rehman
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Ghandhari, Mehrdad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Consensus Control for Induction Motors Speed Regulation2014In: 2014 16TH European Conference on Power Electronics and Applications, 2014Conference paper (Refereed)
    Abstract [en]

    Cyber Physical Energy Systems (CPES) development requires the combination of distributed intelligence to fulfill the future complex tasks and reach the increase the energy demands. Electrical Industrial Systems (EIS) are in continuous evolving integrating new technologies allowing to a better performance and increase the efficiency. This paper applies the consensus protocol for Multi-Agent Systems (MAS) to control the speed of multiple induction motors. In this paper, the behaviour of the system under different disturbances and scenarios has been simulated, thus, confirming the suitability and simplicity of this method for coordinating the control actions.

  • 8.
    Chamorro, Harold R.
    et al.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Ordonez, Camilo A.
    Peng, Jimmy C.
    Ghandhari, Mehrdad
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Non-synchronous generation impact on power systems coherency2016In: IET Generation, Transmission & Distribution, ISSN 1751-8687, E-ISSN 1751-8695, Vol. 10, no 10, p. 2443-2453Article in journal (Refereed)
    Abstract [en]

    The increasing integration of renewables into the grid based on power electronics converters interfaces is affecting the power systems dynamics, requiring effective monitoring and visualisation to provide appropriate assessment during extreme events. The coherent group identification in power systems is of importance for dynamic studies and transmission capability improvement. This study analyses the coherency based on the mode shapes, the application of the Koopman mode analysis (KMA) and a Prony analysis (PA) on-line variation for the identification of coherent groups in power systems. KMA and PA use the voltage angle measurements obtained from simulation. The clustering of the coherent groups are evaluated in two test systems. The coherency methods are also evaluated taking into account the impact of a large gradual scale inclusion of non-synchronous generation under different penetration level cases. From the comparison and visualisation of the different methods it is possible to observe the impact of the large inclusion of non-synchronous generation on the coherency.

  • 9.
    Chamorro, Harold R.
    et al.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Ordonez, Camilo A.
    Peng, Jimmy C. -H.
    Ghandhari, Mehrdad
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    On-line Oscillations Monitoring under High Penetration of Non-Synchronous Generation2015In: 2015 IEEE INTERNATIONAL CONFERENCE ON SMART GRID COMMUNICATIONS (SMARTGRIDCOMM), IEEE , 2015, p. 278-282Conference paper (Refereed)
    Abstract [en]

    The large scale penetration of non-synchronous generation based power electronics converters interfaces in current power systems is modifying their dynamic characteristics. The observation, monitoring and supervision of the electromechanical oscillation changes due to this integration is a requirement in order to protect the system from undesired events. This paper uses the Prony analysis to estimate the critical modes by using the tie-lines which interconnect the operative areas as measurement points and evaluating the impact of the large gradual scale inclusion of non-synchronous generation on power systems. The modes monitoring involved in the transient dynamic response are shown in the different penetration level cases. From the computed measurements, the frequency and damping variation in the different cases studied on the test system is obtained, which shows the impact of the large inclusion of non-synchronous generation.

  • 10.
    Chamorro, Harold R.
    et al.
    KTH.
    Ordonez, Camilo A.
    Transmiss Vicepresidency Bogota Elect Co EEB, Planning & New Bussiness Dept, Bogota, Colombia..
    Peng, Jimmy C-H.
    Natl Univ Singapore, Dept Elect & Comp Engn, Singapore, Singapore..
    Gonzalez-Longatt, Francisco
    Loughborough Univ Technol, Loughborough, Leics, England..
    Sood, Vijay K.
    Univ Ontario, Inst Technol, Dept Elect & Comp Engn, Ottawa, ON, Canada..
    Sharaf, Adel M.
    Sharaf Energy Syst, Fredericton, NB, Canada..
    Impact of Non-Synchronous Generation on Transmission Oscillations Paths2018In: 2018 IEEE Texas Power and Energy Conference (TPEC), Institute of Electrical and Electronics Engineers (IEEE), 2018Conference paper (Refereed)
    Abstract [en]

    The large scale penetration of non-synchronous generation has been causing several impacts on the power systems dynamics. The low-frequency oscillations affect the power exchanged along the transmission lines/corridors. This paper uses the Multi-Prony Analysis mode estimation technique to monitor and suggest the dominant oscillation modes which can be useful for wide-area control purposes. Moreover, the oscillation modes are also monitored under gradual cases of non-synchronous generation integration in the system. The methodology is applied to two different test transmission systems: i) the two area system and, ii) the Nordic 32 system. The results illustrate the similarity and differences in the scenarios proposed.

  • 11.
    Chamorro, Harold R.
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Sanchez, A. C.
    Verjordet, A.
    Jimenez, F.
    Gonzalez-Longatt, F.
    Member, S.
    Sood, V. K.
    Distributed Synthetic Inertia Control in Power Systems2018In: Proceedings of 8th International Conference on Energy and Environment: Energy Saved Today is Asset for Future, CIEM 2017, Institute of Electrical and Electronics Engineers (IEEE), 2018, p. 74-78, article id 8120874Conference paper (Refereed)
    Abstract [en]

    Due to the increasing use of renewables into the grid connected through power converters, the rotational inertia in power systems has been reducing. Consequently the frequency response requires the activation of the so-called synthetic inertia control. The synthetic inertia control aims to inject an extra power component when the system experiences a frequency disturbance event. In this paper, it is proposed that a distributed dynamic controllers for sharing the synthetic inertia control actions between the various active power converters in the grid for the improvement of the frequency response. It is assumed that a communication structure between the synthetic inertia controllers and the local power converters is involved in the system. The convergence of the control system is reached through a game population theory and the primary frequency control has been improved. The results are validated based on simulation of a two-area test system.

  • 12.
    Chamorro, Harold Rene
    et al.
    KTH.
    Gonzalez-Longatt, F.
    Sood, V. K.
    Dynamic Measurements of the Wind Power Impact on Power System Inertia and Stability2018In: International Conference on Innovative Smart Grid Technologies, ISGT Asia 2018, Institute of Electrical and Electronics Engineers Inc. , 2018, p. 793-797Conference paper (Refereed)
    Abstract [en]

    The integration of wind power generation (WPG) have many different impacts on the current power transmission and distribution systems. Most of them are related to their effect on the dynamic behaviour and frequency deviation during system frequency disturbances affecting the system inertia response. Different approaches have been presented to show the dynamic behaviour diminution, and several metrics have been proposed to quantify the impact of the inertia reduction. This scientific paper looks at the background system inertia problem, presenting some of the most significant contributions in observation of power system dynamic under high penetrations of WPG and presents two dynamic measurements. First one measures the damping ratio of the power lines quantifying it in an online fashion. The second one measures the frequency of an electrical power signal. The dynamic measurements are tested in a hypothetical active power signal with the inclusion of wind energy showing the affectivity of the dynamic measurements presented and the impact of wind farms in power systems. Finally, future work and conclusions are given. 

  • 13.
    Chamorro Vera, Harold R
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Ghandhari, Mehrdad
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Eriksson, R.
    Coherent groups identification under high penetration of non-synchronous generation2016In: IEEE Power and Energy Society General Meeting, IEEE, 2016Conference paper (Refereed)
    Abstract [en]

    The current power systems are facing an important transition due to the integration of non-synchronous generation through back-to-back Full Rated Converters' (FRC). Coherency behaviour under the presence of large inclusion of renewables requires special attention in order to understand the swing oscillations when the inertia is decreasing due to the decoupling. This paper presents the application of the so-called Koopman operator for the identification of coherent groups in power systems with the influence of non-synchronous generation. The method provides a clustering observation tool based on measurement signals allowing to identify the dynamic changes effected through the derived spectral analysis of the Koopman modes. The applied method of coherency identification is evaluated in the Nordic test system through gradually increasing integration and different fault locations.

  • 14.
    Chamorro Vera, Harold Rene
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    Ordonez, C. A.
    Peng, J. C. -H
    Gonzalez-Longatt, F.
    Sood, V. K.
    Coherency Estimation in Power Systems: A Koopman Operator Approach2019In: Springer Optimization and Its Applications, Springer International Publishing , 2019, p. 201-225Chapter in book (Refereed)
    Abstract [en]

    Integrating a significant amount of non-synchronous generation into power systems creates new technical challenges for transmission systems. The research and understanding of the impact of the non-synchronous generation through back-to-back Full Rated Converters’ (FRCs) on power system’s coherency is a matter of importance. Coherency behavior under the presence of large inclusion of non-synchronous generation requires more research, in order to understand the forming groups, after a disturbance, when the inertia is decreasing due to the decoupling. This document presents the application of the so-called Koopman Operator for the identification of coherent groups in power systems with the influence of non-synchronous generation. The Koopman Analysis clusters the coherent groups based on the measurements obtained. The visualization of the coherent groups identified allows to observe their dynamic variations according to the penetration level or fault location. The applied method of coherency identification is evaluated in the Nordic test system through gradually increasing integration of non-synchronous generations and different fault scenarios.

  • 15.
    Chamorro Vera, Harold Rene
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems.
    Riaño, I.
    Gerndt, R.
    Zelinka, I.
    Gonzalez-Longatt, F.
    Sood, V. K.
    Synthetic inertia control based on fuzzy adaptive differential evolution2019In: International Journal of Electrical Power & Energy Systems, ISSN 0142-0615, E-ISSN 1879-3517, Vol. 105, p. 803-813Article in journal (Refereed)
    Abstract [en]

    The transformation of the traditional transmission power systems due to the current rise of non-synchronous generation on it presents new engineering challenges. One of the challenges is the degradation of the inertial response due to the large penetration of high power converters used for the interconnection of renewables energy sources. The addition of a supplementary synthetic inertia control loop can contribute to the improvement of the inertial response. This paper proposes the application of a novel Fuzzy Adaptive Differential Evolution (FADE) algorithm for the tuning of a fuzzy controller for the improvement of the synthetic inertia control in power systems. The method is validated with two test power systems: (i) an aggregated power system and its purpose is to understand the controller-system behavior, and (ii) a two-area test power system where one of the synchronous machine has been replaced by a full aggregated model of a Wind Turbine Generator (WTG), whereby different limits in the tuning process can be analyzed. Results demonstrate the evolution of the membership functions and the inertial response enhancement in the respective test cases. Moreover, the appropriate tuning of the controller shows that it is possible to substantially reduce the instantaneous frequency deviation.

  • 16.
    Chamorro Vera, Harold Rene
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems.
    Sanchez, A. C.
    Pantoja, A.
    Zelinka, I.
    Gonzalez-Longatt, F.
    Sood, V. K.
    A network control system for hydro plants to counteract the non-synchronous generation integration2019In: International Journal of Electrical Power & Energy Systems, ISSN 0142-0615, E-ISSN 1879-3517, Vol. 105, p. 404-419Article in journal (Refereed)
    Abstract [en]

    Sweden, a country with abundant hydro power, has expectations to include more wind power into its electrical system. Currently, in order to improve the frequency response requirements of its electrical system, the country is considering upgrading its hydro-governors. This effort is part of maintaining the system frequency and reaction within their limits following any disturbance events. To partially compensate for increased frequency fluctuations due to an increased share of renewables on its system, the frequency response of hydro-governors should be improved. This paper proposes an innovative network control system, through a supplementary control, for the improvement of the hydro-governor's action. This supplementary control allows having more flexibility over the control action and improves the primary frequency control, and thereby the overall system frequency response. The proposed supplementary control, based on an evolutionary game theory strategy, uses remote measurements and a hierarchical dynamic adjustment of the control. Additionally, in order to guarantee an optimal response, a Simulated Annealing Algorithm (SAA) is combined with the supplementary control. This paper illustrates the analysis and design of the proposed methodology, and is tested on two power systems models: (i) an aggregated model that represents the frequency response of Sweden, Norway and Finland, and (ii) The Nordic 32 test system.

  • 17. Dominguez-Bonilla, Camilo
    et al.
    Gutierrez, Alonso
    Jimenez, Fernando
    Chamorro, H.R.
    KTH.
    SysML Methodology for FPGA-based Controller Design for Quadcopters2016In: 7TH IEEE ANNUAL INFORMATION TECHNOLOGY, ELECTRONICS & MOBILE COMMUNICATION CONFERENCE IEEE IEMCON-2016, Institute of Electrical and Electronics Engineers (IEEE), 2016Conference paper (Refereed)
    Abstract [en]

    In this paper an Integrated Development Environment (IDE) is proposed for the FPGA Controller design for quadcopters (including specifications, design and implementa-tion). This IDE was developed using the High Level Specification of Embedded Systems Rich Client Platform (HiLeS-RCP). The HiLeS-RCP is a framework for specialized "per product line" IDE construction, which links requirements formalization step that represents the structural modelling using SysML, and the virtual prototyping. In this work the product line corresponds to flight controllers for quadcopters. This specialized IDE allows to manage the complexity of designs and to reduce development time for a modular implementation in Hardware Description Language (HDL).

  • 18. Fikari, Stamatia Gkiala
    et al.
    Ghaem Sigarchian, Sara
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Chamorro, Harold R.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Modeling and Simulation of an Autonomous Hybrid Power System2017In: 2017 52nd International Universities Power Engineering Conference (UPEC), IEEE, 2017Conference paper (Refereed)
    Abstract [en]

    Renewable energy sources contribute to overcome the problem of environmental pollution and secure the energy independency every country needs, while at the same time the autonomous microgrids can improve the electrification rates of poorer countries. In this article, the modeling process and operation of an autonomous hybrid power system are studied for a hypothetical case study of electrification of a remote village of 100 inhabitants in Kenya. The microgrid consists of photovoltaics, wind turbine, batteries, diesel genset, basic loads of different priorities, water pumping and purification load. The system is modeled in Simulink MATLAB and is simulated in terms of power management. The primary load is categorized in different priorities, while water pumping and purification is used as deferrable load. The "load following" dispatch strategy is adopted. The outputs of the model are the power produced by the various sources and the power consumed by all loads during the simulation time, as well as the produced and consumed energy, information on the battery operation and the dumped power or the power shortage. Both the microgrid's operation and the performance of the dispatch strategy are evaluated considering the level on which the citizens' energy needs are covered and the efficient management of the produced energy. Managing the extra power or tackling the deficit of power in the system are the key issues to be addressed. After all, the model represents reliably the behavior of the microgrid and several improving actions are suggested, based on the results analysis.

  • 19.
    Garzon, C. L.
    et al.
    Automatizac Avanzada, Bogota, Colombia..
    Chamorro Vera, Harold Rene
    KTH, School of Electrical Engineering (EES), Electric Power Systems. NDT Innovations Inc, Bogota, Colombia..
    Diaz, M. M.
    Sequeira, E.
    UTEP, El Paso, TX USA..
    Leottau, L.
    Univ Chile, Adv Min Technol Ctr, Dept Elect Engn, Santiago, Chile..
    Swarm Ant Algorithm Incorporation for Navigation of Resource Collecting Robots2014In: 2014 5th IEEE RAS & EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob), IEEE , 2014, p. 987-992Conference paper (Refereed)
    Abstract [en]

    Swarm robotics requires the development of new strategies and algorithm integration, which allow for the improvement of the design and the applications for harvesting or collecting resources. This paper describes the programming and design of Finite State Machines (FSM) bio-inspired algorithms for seeker and resource gathering Pherobots systems, like Anthill Known Location (AKL) aggressiveness and sense of panic. FSM designing allows for the use of control architectures for behaviour-based agents and for measuring the change in system performance. Simulations demonstrate the capability of the algorithms under different environments and scenarios.

  • 20. Gutierrez, A.
    et al.
    Chamorro, H.R.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Jimenez, J. F.
    Villa, L. F. L.
    Alonso, C.
    Hardware-in-the-loop simulation of PV systems in micro-grids using SysML models2015In: 2015 IEEE 16th Workshop on Control and Modeling for Power Electronics, IEEE , 2015Conference paper (Refereed)
    Abstract [en]

    This paper outlines a methodology for modeling photovoltaic systems in embedded hardware. This methodology uses the HiLeS platform to transform SysML models in Petri nets and generate VHDL code. The proposed methodology is intended for Hardware-in-the-Loop simulations of power converters and PV panels in microgrids. In addition, this methodology allows the design of MPPT controllers for their direct implementation in FPGA.

  • 21. Gutierrez, A.
    et al.
    Chamorro, H.R.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Jimenez, J.F.
    Supervisory Control for Interleaved Boost Converters using HiLeS-Designer2014In: 2014 16TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'14-ECCE EUROPE), IEEE Press, 2014Conference paper (Refereed)
    Abstract [en]

    This paper presents the application of HiLeS (High Level Specification of Embedded Systems) formalism to design a supervisory controller based on FPGA for interleaved boost converters. This controller is intended to increase the versatility and efficiency of interleaved boost converters. Furthermore, the proposed supervisory controller uses Petri nets for structural analysis and stability. HiLeS-Designer tool, which is a platform based on HiLeS formalism, is used to design and implement the supervisory controller in embedded hardware. This approach uses the digital component of VHDL-AMS code generated by the HiLeS-Designer tool to implement the supervisory controller in FPGA. Simulations and experimental results show that the proposed control strategy increases the operating range and efficiency of interleaved boost converters.

  • 22.
    Gutierrez, A.
    et al.
    Universidad de Los Andes, Colombia; Univ. de Toulouse, Univ. Paul Sabatier, France.
    Chamorro, H.R.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Villa, L. F. L.
    Jimenez, J. F.
    Alonso, C.
    SysML Methodology for HIL Implementation of PV Models2015In: 2015 17TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'15 ECCE-EUROPE), IEEE , 2015Conference paper (Refereed)
    Abstract [en]

    This paper describes a methodology for implementing in FPGA models of photovoltaic panels for Hardware-in-the-Loop (HIL) and real-time simulations. The proposed methodology integrates numerical solutions, SysML diagrams and Petri nets for structural design and formal validation. In this study, photovoltaic cells have been modeled using the single diode circuit. The photovoltaic panel model is solved by the Newton-Raphson method, and the Lagrange remainder is employed to limit the iteration number. Results show suitable accuracy and performance of the proposed methodology.

  • 23.
    Krechel, Thomas
    et al.
    Centre for Renewable Energy Systems Technology – CREST. Loughborough University, Loughborough, United Kingdom.
    Sanchez, Francisco
    Centre for Renewable Energy Systems Technology – CREST. Loughborough University, Loughborough, United Kingdom.
    Gonzalez-Longatt, Francisco
    Centre for Renewable Energy Systems Technology – CREST. Loughborough University, Loughborough, United Kingdom.
    Chamorro Vera, Harold Rene
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    Rueda, Jose Luis
    Section Intelligent Electrical Power Grids, Department of Electrical Sustainable Energy, Delft University of Technology.
    Transmission system-friendly microgrids: an option to provide ancillary services2019In: Distributed Energy Resources in Microgrids: Integration, Challenges and Optimization / [ed] Rajeev Kumar Chauhan and Kalpana Chauhan, Academic Press , 2019, p. 291-321Chapter in book (Other academic)
    Abstract [en]

    Looking to the future, there are several challenges that the electricity networks will face: prosperity, sustainable growth, global, and security. The electricity industry situation is complex because resources across the world are becoming scarce and the need for sustainable growth is increasingly important. The evolution of a decarbonized economy involves three main aspects: developing energy efficiency measures, developing renewable energy capabilities, and dealing with adaptation needs arising due to climate change. However, the massive integration of generation technologies based on power electronic converters (PECs) are producing adverse effects for transmission system operators (TSOs) and distribution network operators (DNOs). The TSOs and DNOs are witnessing this loss of control of their systems and are exploring the possibility of requiring these new generators to adopt a set of functionalities to help mitigate the side effects caused by the converter/renewable generation. The concept of power converter-based microgrids (MGs) provides vast opportunities for many service providers who can help operate the transmission system. The classical concept of an MG defines it as a set of interconnected distributed energy resources (DERs) capable of providing sufficient and continuous energy to a significant portion of internal load demand. The MG concept has been extraordinary explored in the literature, especially with regard to the connection to the traditional alternating current (AC) system. However, the most recent development of grid-friendly or smart-converters allows the PECs to perform additional tasks that could help the TSO with operational problems, such as voltage control, low short-circuit currents, etc. This chapter is dedicated to introducing the concept of grid-friendly or smart-converters and how they can be used to create fully controllable MGs able to provide auxiliaries services to the transmission system: the so-called “transmission system-friendly microgrid.” This is an AC MG fully dominated by power-converter technologies, where the local and wide control is used in the mode of a power converter, which enables novel operational functions, for example, reactive power provision to enable voltage control. This chapter presents the concept of grid-friendly or smart-converters and their main capabilities. Their functions are enhanced by a wide-area control and the concept is a transmission system-friendly MG. The chapter includes numerical results of the proposed control algorithm and its implementation using Python and simulations using DIgSILENT PowerFactory to demonstrate the suitability of the proposed transmission system-friendly MG.

  • 24. Mayorga, J. L.
    et al.
    Dominguez-Bonilla, C.
    Gutierrez, A.
    Jimenez, F.
    Chamorro, Harald
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Development of real-time control emulator in FPGA using HiLeS methodology2015In: IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society, Institute of Electrical and Electronics Engineers (IEEE), 2015, p. 4076-4081Conference paper (Refereed)
    Abstract [en]

    Embedded systems (ES) based on field programmable gate arrays (FPGAs) enhance the overall computational capability and relieve computational load. The lack on design and implementation methods for specific control functions in hardware limits the application of complex control techniques. Therefore, a design methodology approach is showed in the current work. Fuzzy, LQR, and PI control systems are modeled using HiLeS-RCP (High Level Specification of Embedded Systems-Rich Client Platform), a methodology that links the requirements formalization step using SySML and the virtual prototyping based on Petri Nets which takes place in the system design within the process of functional modeling, generating VHDL-AMS code to implement in FPGA.

  • 25.
    Moreno, R.
    et al.
    Univ Los Andes, Bogota, Colombia..
    Chamorro Vera, Harold Rene
    KTH. KTH, Royal Inst Technol, Stockholm, Sweden..
    Izadkhast, S. M.
    Pontificia Univ Comillas, Madrid, Spain..
    A Framework for the Energy Aggregator Model2013In: 2013 WORKSHOP ON POWER ELECTRONICS AND POWER QUALITY APPLICATIONS (PEPQA), IEEE , 2013Conference paper (Refereed)
    Abstract [en]

    The new resources available in power system require a new agent to manage these resources in the most efficient way. Resources provided by the supply side or the demand side can be managed together in order to provide some services to the grid. New resources such as massive electric vehicle and distributed generation have been being gradually integrated to the grid and for the next years the integration tendency will follow increasing. These resources require a different approach to be managed adequately. The integration of intermittent resources into the grid is a challenging area but these issues can be addressed by an aggregator agent. On the other hand, the demand of power required by electric vehicle integration can impact the load curve of different distribution system far from its capability. An aggregator agent also can be useful to manage adequately the demand required by Electric Vehicles. This paper proposes an energy aggregator model (EAM) to manage power transactions between the grid and the demand side resources.

  • 26.
    Nasri, Amin
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Chamorro Vera, Harold Rene
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Ghandhari, Mehrdad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Multi-parameter trajectory sensitivity approach to analyze the impacts of wind powerpenetration on power system transient stability2014In: CIGRE, AORC Technical meeting 2014, 2014, p. 7-Conference paper (Refereed)
    Abstract [en]

    In the most real-world power systems, the share of wind power penetration in total installed generationcapacity is rapidly increasing. This large-scale integration of wind power into an electric power systemposes challenges to the power system operators and planners. One of the main challenges is tomaintain sufficient margins for transient stability. High penetration of wind power causes reduction ofthe total kinetic energy stored in through rotating masses since wind generators are decoupled from thegrid by power electronic converters, and therefore, cannot contribute to the inertia of the grid. Theresulting reduction of grid inertia may cause higher risk of transient instability. In this paper, trajectorysensitivity analysis (TSA) technique is used to determine the impacts of decreasing inertia of differentgenerating units on the transient stability of power system. Numerical results from IEEE 10-machine39-bus test system demonstrate the usefulness of the proposed approach.

  • 27. Ordonez, C. A.
    et al.
    Chamorro, Harold Rene
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Quintero, J.
    Leelaruji, R.
    Peng, Jimmy C. H.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Prony-based on-line oscillation detection with real PMU information2017In: 2016 IEEE Colombian Conference on Robotics and Automation, CCRA 2016 - Conference Proceedings, Institute of Electrical and Electronics Engineers (IEEE), 2017, article id 7811401Conference paper (Refereed)
    Abstract [en]

    Wide-Area monitoring systems are a requirement in the current power systems in order to provide an appropriate monitoring, supervision and protection from undesired events. Electromechanical oscillations can provoke critical situations and affect the power transmission capability. This paper applies the Multi-Prony Analysis (MPA) to estimate the critical modes by using the tie-lines power measurements from Phasor Measuerement Unit (PMU)-data. The modes observation including an online sliding window give the frequency and damping variation allowing to detect and classify the range of the oscillation.

  • 28.
    Raak, Fredrik
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems. Kyoto University, Japan.
    Susuki, Yoshihiko
    Hikihara, Takashi
    Chamorro, Harold
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Ghandhari, Mehrdad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Partitioning Power Grids via Nonlinear Koopman Mode Analysis2014In: 2014 IEEE PES Innovative Smart Grid Technologies Conference, ISGT 2014, IEEE conference proceedings, 2014, p. 6816374-Conference paper (Refereed)
    Abstract [en]

    This paper proposes a new method for partitioning power grids based on the nonlinear Koopman Mode Analysis (KMA). Grid partitioning is the fundamental problem in the controlled islanding strategy. The KMA is a new technique of nonlinear modal decomposition based on properties of the point spectrum of the so-called Koopman operator. The key idea in the proposed method is to determine a set of islanded sub-grids using KMA of data on voltage angle dynamics of every bus. The method is numerically investigated with the IEEE 118-bus test system. It is shown that the proposed method provides partitions on a multiple frequency scale as well as captures the intrinsic structural properties of a grid characterized by spectral graph theory.

  • 29.
    Tobon, Alfredo G.
    et al.
    Enerfin Colombia, Bogota, Colombia..
    Chamorro Vera, Harold Rene
    KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems.
    Gonzalez-Longatt, Francisco
    Loughborough Univ, Loughborough, Leics, England..
    Sood, Vijay K.
    Univ Ontario, Oshawa, ON, Canada..
    Reliability Assessment in Transmission Considering Intermittent Energy Resources2019In: 2019 IEEE 10th Latin American Symposium on Circuits and Systems, LASCAS 2019 - Proceedings / [ed] Murphy, R S, IEEE, 2019, p. 193-196, article id 8667564Conference paper (Refereed)
    Abstract [en]

    Current power systems face different types of problems, such as the balance in the adequacy of the resources, security, grid reliability, complementarity, resilience, stability and economic efficiency, to name a few. This paper deals with the problems in reliability imposed onto the grid by power generation with intermittent energy resources, i.e. wind and solar energy. Power systems with high penetration grid-connected power generators that use an energy source which is not available because of its random nature, are addressed here in terms of reliability for the grid. This paper presents the results of a study done on a reliability test power system that takes into account, first how the system behaves regarding reliability indexes with generation from conventional energy resources (Fossil, Nuclear and Hydropower), Then the system is presented introducing wind power and solar power with an elevated degree of penetration in the grid. The evaluation of the system was performed using computational modelling and can potentially be applied to other test systems.

  • 30.
    Xi, Jiangnan
    et al.
    KTH.
    Chamorro, Harold R.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Persson, Jonas
    Westberg, Andreas
    Wall, Daniel
    Ghandari, Mehrdad
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    On the Influence of the Backlash Governor Settings on the Frequency Response in Power Systems2016In: 2016 IEEE PES ASIA-PACIFIC POWER AND ENERGY ENGINEERING CONFERENCE (APPEEC), IEEE conference proceedings, 2016, p. 732-737Conference paper (Refereed)
    Abstract [en]

    The automatic frequency containment reserve (FCR-N) is in place to keep the electric frequency within the interval 50.0 +/-0.1 Hz during normal operation. This function is mainly provided by a number of hydropower plants where the turbine governor is set to control the discharge in proportion to the measured frequency deviation. In later years it has been shown that the disturbance damping is very low in an interval around 1160 Hz and it is believed that proper tuning of the turbine governors that provide FCR-N can help mitigating this problem. New regulator settings have been suggested to improve the performance of the FCR-N, yet keeping the system robust and the wear on participating units at a minimum. It is now desired to investigate the possible effects of new governor settings on the overall power system frequency response. In a word, the overall performance for new governor settings are tested in a large scale power system model in this thesis paper. The frequency response with the newly suggested governor settings have been investigated when introducing a disturbance into the system. Secondly, the effects of the new governor settings on electro-mechanical oscillations are also investigated.

1 - 30 of 30
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