OffshoreDC: Electricity market and power flow impact of wind power and DC grids in the Baltic Sea

Niina Helistö, Vin Cent Tai

    Research output: Book/ReportReport

    Abstract

    This report analyses offshore wind power development and offshore grid options in the Baltic Sea region. 27 GW of offshore wind power was assumed to be built in the Baltic Sea. The approach in this study links offshore wind power plant clustering, onshore connection point determination, offshore grid structure optimisation, unit commitment and economic dispatch simulation and power flow calculation together. The study compares the investment costs of different offshore grid topologies as well as the impacts of the offshore grids on the total operational costs of the power system, electricity production per fuel type, wind power curtailment and CO2 emissions. Annual electricity transmissions between regions as well as power flows in selected one-hour snapshots are studied as well. The results show that additional interconnections between price regions are clearly beneficial in the Baltic Sea region. Multi-terminal offshore grids may beat offshore grids consisting of two-terminal links in profitability, provided that high voltage direct current (HVDC) circuit breakers are available and their price is low enough. Annual electricity transmissions were generally from north to south and from east to west in the modelled area, which consisted of Nordic and Baltic countries, Germany and Poland. In power flow calculation, loop flows, which were not captured with the unit commitment and economic dispatch model, were detected inside and between Norway and Sweden. The grid model did not allow loop flows in Central Europe to be investigated.
    Original languageEnglish
    PublisherVTT Technical Research Centre of Finland
    Number of pages65
    Publication statusPublished - 2015
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesVTT Research Report
    VolumeVTT-R-05999-15

    Fingerprint

    Wind power
    Electricity
    Economics
    Electric circuit breakers
    Costs
    Profitability
    Power plants
    Topology
    Power markets
    Electric potential

    Keywords

    • HVDC transmission
    • offshore wind power
    • offshore grid
    • power system planning

    Cite this

    Helistö, N., & Tai, V. C. (2015). OffshoreDC: Electricity market and power flow impact of wind power and DC grids in the Baltic Sea. VTT Technical Research Centre of Finland. VTT Research Report, Vol.. VTT-R-05999-15
    Helistö, Niina ; Tai, Vin Cent. / OffshoreDC : Electricity market and power flow impact of wind power and DC grids in the Baltic Sea. VTT Technical Research Centre of Finland, 2015. 65 p. (VTT Research Report, Vol. VTT-R-05999-15).
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    abstract = "This report analyses offshore wind power development and offshore grid options in the Baltic Sea region. 27 GW of offshore wind power was assumed to be built in the Baltic Sea. The approach in this study links offshore wind power plant clustering, onshore connection point determination, offshore grid structure optimisation, unit commitment and economic dispatch simulation and power flow calculation together. The study compares the investment costs of different offshore grid topologies as well as the impacts of the offshore grids on the total operational costs of the power system, electricity production per fuel type, wind power curtailment and CO2 emissions. Annual electricity transmissions between regions as well as power flows in selected one-hour snapshots are studied as well. The results show that additional interconnections between price regions are clearly beneficial in the Baltic Sea region. Multi-terminal offshore grids may beat offshore grids consisting of two-terminal links in profitability, provided that high voltage direct current (HVDC) circuit breakers are available and their price is low enough. Annual electricity transmissions were generally from north to south and from east to west in the modelled area, which consisted of Nordic and Baltic countries, Germany and Poland. In power flow calculation, loop flows, which were not captured with the unit commitment and economic dispatch model, were detected inside and between Norway and Sweden. The grid model did not allow loop flows in Central Europe to be investigated.",
    keywords = "HVDC transmission, offshore wind power, offshore grid, power system planning",
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    Helistö, N & Tai, VC 2015, OffshoreDC: Electricity market and power flow impact of wind power and DC grids in the Baltic Sea. VTT Research Report, vol. VTT-R-05999-15, VTT Technical Research Centre of Finland.

    OffshoreDC : Electricity market and power flow impact of wind power and DC grids in the Baltic Sea. / Helistö, Niina; Tai, Vin Cent.

    VTT Technical Research Centre of Finland, 2015. 65 p. (VTT Research Report, Vol. VTT-R-05999-15).

    Research output: Book/ReportReport

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    AU - Helistö, Niina

    AU - Tai, Vin Cent

    N1 - Project code: 100393

    PY - 2015

    Y1 - 2015

    N2 - This report analyses offshore wind power development and offshore grid options in the Baltic Sea region. 27 GW of offshore wind power was assumed to be built in the Baltic Sea. The approach in this study links offshore wind power plant clustering, onshore connection point determination, offshore grid structure optimisation, unit commitment and economic dispatch simulation and power flow calculation together. The study compares the investment costs of different offshore grid topologies as well as the impacts of the offshore grids on the total operational costs of the power system, electricity production per fuel type, wind power curtailment and CO2 emissions. Annual electricity transmissions between regions as well as power flows in selected one-hour snapshots are studied as well. The results show that additional interconnections between price regions are clearly beneficial in the Baltic Sea region. Multi-terminal offshore grids may beat offshore grids consisting of two-terminal links in profitability, provided that high voltage direct current (HVDC) circuit breakers are available and their price is low enough. Annual electricity transmissions were generally from north to south and from east to west in the modelled area, which consisted of Nordic and Baltic countries, Germany and Poland. In power flow calculation, loop flows, which were not captured with the unit commitment and economic dispatch model, were detected inside and between Norway and Sweden. The grid model did not allow loop flows in Central Europe to be investigated.

    AB - This report analyses offshore wind power development and offshore grid options in the Baltic Sea region. 27 GW of offshore wind power was assumed to be built in the Baltic Sea. The approach in this study links offshore wind power plant clustering, onshore connection point determination, offshore grid structure optimisation, unit commitment and economic dispatch simulation and power flow calculation together. The study compares the investment costs of different offshore grid topologies as well as the impacts of the offshore grids on the total operational costs of the power system, electricity production per fuel type, wind power curtailment and CO2 emissions. Annual electricity transmissions between regions as well as power flows in selected one-hour snapshots are studied as well. The results show that additional interconnections between price regions are clearly beneficial in the Baltic Sea region. Multi-terminal offshore grids may beat offshore grids consisting of two-terminal links in profitability, provided that high voltage direct current (HVDC) circuit breakers are available and their price is low enough. Annual electricity transmissions were generally from north to south and from east to west in the modelled area, which consisted of Nordic and Baltic countries, Germany and Poland. In power flow calculation, loop flows, which were not captured with the unit commitment and economic dispatch model, were detected inside and between Norway and Sweden. The grid model did not allow loop flows in Central Europe to be investigated.

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    KW - power system planning

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    Helistö N, Tai VC. OffshoreDC: Electricity market and power flow impact of wind power and DC grids in the Baltic Sea. VTT Technical Research Centre of Finland, 2015. 65 p. (VTT Research Report, Vol. VTT-R-05999-15).