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  • 801. Zima-Bockarjova, Marija
    et al.
    Matevosyan, Julija
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Zima, Marek
    Söder, Lennart
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Sharing of Profit From Coordinated Operation Planning and Bidding of Hydro and Wind Power2010In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, Vol. 25, no 3, p. 1663-1673Article in journal (Refereed)
    Abstract [en]

    Depending on market rules, namely congestion management and balancing management, coordination between wind and hydro producers may be mutually beneficial. In this paper we propose a new collaboration scheme and a fair and transparent method, based on the Shapley value, for splitting the extra value caused by a coordinated bidding and operation strategy. We account for uncertainties in wind forecast and energy price evolution. We demonstrate the proposed approaches on a realistic system including congested lines, wind farm and a hydro plant consisting of several reservoir stages.

  • 802.
    Zografos, Dimitrios
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Ghandhari, Mehrdad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Eriksson, R.
    Power system inertia estimation: Utilization of frequency and voltage response after a disturbance2018In: Electric power systems research, ISSN 0378-7796, E-ISSN 1873-2046, Vol. 161, p. 52-60Article in journal (Refereed)
    Abstract [en]

    Power system inertia is gradually being reduced due to the ongoing replacement of conventional synchronous power plants by intermittent generation. This affects the frequency response of the system and necessitates the estimation of power system inertia, so that sufficient power reserves are retained. This paper contributes with a novel disturbance-based inertia estimation method, that simultaneously estimates the power change after a disturbance. The proposed method accommodates the frequency and voltage dynamics, which significantly affect the system's power change, and hence the inertia estimation. Two separate approaches – that are also capable of standing alone – are combined, in order to accommodate the dynamics. An extended version of the Nordic32 test system is used for the application of the method, where several case studies and a comparison are investigated, so as to examine the method's accuracy and robustness.

  • 803.
    Öhrström, Magnus
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Geidl, M.
    Söder, Lennart
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Andersson, G.
    Evaluation of travelling wave based protection schemes for implementation in medium voltage distribution systems2005In: IEE Conference Publication, 2005, Vol. 3, no 2005-11034, p. 481-483Conference paper (Refereed)
    Abstract [en]

    This paper investigates travelling wave based protection schemes developed for high voltage transmission systems and their adaptation to medium voltage distribution networks in order to enable ultra high speed relaying (within a quarter of a cycle of the power frequency) on a medium voltage level. After different travelling wave algorithms are evaluated using simple test systems, they are applied to an industrial power system where fault detection within one millisecond is required. Difficulties that arise from typical characteristics of medium voltage distribution systems are outlined and requirements to measurement and signal processing systems are discussed.

  • 804.
    Östman, Kristina
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Pricing electric-power transmission: The Swedish methodology and a new approach2013In: 2013 4th IEEE/PES Innovative Smart Grid Technologies Europe (ISGT EUROPE), IEEE , 2013, p. 6695429-Conference paper (Refereed)
    Abstract [en]

    Electricity systems are changing rapidly worldwide, and transmission pricing needs to adapt. As renewable energy production increases, it is vital that the costs for transmission are recovered while recognising the special characteristics of different energy sources. In this paper, a new transmission pricing approach is presented and compared to the approach currently used in Sweden. By calculating nodal transmission tariffs based on marginal transmission costs and incorporating uncertainty in demand and generation, the new approach caters for a changing electricity system. To assess their impacts on renewable energy production, the two methodologies are applied to a case study mimicking the Swedish system with an increased wind power penetration. The results show that location and generation type can strongly influence the transmission tariffs, and that charging renewable energy producers less could be a least-cost option.

  • 805.
    Östman, Kristina
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    The suitability of current transmission pricing systems for increased renewable energy production2013In: 2013 IEEE Power and Energy Society General Meeting (PES), IEEE , 2013, p. 6672674-Conference paper (Refereed)
    Abstract [en]

    As renewable electricity generation increases around the world, transmission networks are forced to adapt. The growing need for balancing services and long transmission distances lead to increased costs, which somehow need to be recovered. This paper considers the transmission pricing methodologies in four countries and assesses them against optimal pricing methodologies as defined in academic literature. The countries Australia, Spain, Great Britain and Sweden, with their different renewable energy potential and energy policies, provide a suitable snapshot of transmission pricing today. While they boast different levels of maturity, none of the methodologies fulfill all identified conditions for effective transmission prices with increased amounts of renewable electricity.

  • 806.
    Östman, Kristina
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad Reza
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Transmission pricing in interconnected systems - A case study of the Nordic countries2014In: ENERGYCON 2014 - IEEE International Energy Conference, IEEE Computer Society, 2014, p. 1480-1486Conference paper (Refereed)
    Abstract [en]

    With renewable energy production increasing around the world, there is a growing need for interconnection to balance intermittent supply. This cross-border trade of electricity requires navigating in multiple regulatory regimes and market designs, not least when it comes to transmission pricing. By considering the Nordic countries as a case study, this paper investigates the impact of different transmission pricing regimes on investment decisions for renewable energy production. A generation expansion problem for wind power is simulated with the current transmission prices in Sweden, Finland, Norway, and Denmark applied, along with a baseline case with no transmission pricing differences, to achieve a quantitative comparison. The importance of coherent transmission pricing is demonstrated through the large discrepancy in wind power investments resulting from the two cases studied.

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