Modeling and Control of an Offshore Wind Farm connected to Main Grid with High Voltage Direct Current Transmission

Year 2018, Volume: 18 Issue: 2, 198 - 209, 03.08.2018

Ahmet Mete Vural , Auwalu İbrahim İsmail

Abstract

DOI: 10.26650/electrica.2018.73966

Offshore wind farms inherently need alternating current (AC) grid connection with undersea cables. However, this requires reactive power compensation, which is costly and not practical. Moreover, it threads the stability of the system. For these reasons, high voltage direct current (HVDC) transmission is a promising solution since no reactive power is needed. Furthermore, the DC power flow between offshore and onshore locations as well as the reactive power at either side can easily be controlled by voltage source converters (VSCs). In this paper, the modeling and control of an offshore wind farm connected to the mainland grid power with HVDC transmission is proposed. A control strategy is proposed to control active and reactive power at the offshore wind farm converter and DC voltage at the onshore converter. The overall system, including wind farm, offshore and onshore converters, HVDC transmission, and AC grid side, were tested and verified in a simulation environment. The designed control systems of the VSCs were tested by various case studies.

Keywords

Offshore wind farm, doubly fed induction generator, high voltage direct current, undersea DC cable

Modeling and Control of an Offshore Wind Farm connected to Main Grid with High Voltage Direct Current Transmission

Abstract

DOI: 10.26650/electrica.2018.73966

Offshore
wind farms inherently need alternating current (AC) grid connection with
undersea cables. However, this requires reactive power compensation, which is
costly and not practical. Moreover, it threads the stability of the system. For
these reasons, high voltage direct current (HVDC) transmission is a promising
solution since no reactive power is needed. Furthermore, the DC power flow
between offshore and onshore locations as well as the reactive power at either
side can easily be controlled by voltage source converters (VSCs). In this
paper, the modeling and control of an offshore wind farm connected to the
mainland grid power with HVDC transmission is proposed. A control strategy is
proposed to control active and reactive power at the offshore wind farm
converter and DC voltage at the onshore converter. The overall system,
including wind farm, offshore and onshore converters, HVDC transmission, and AC
grid side, were tested and verified in a simulation environment. The designed
control systems of the VSCs were tested by various case studies.

Keywords

Offshore wind farm, doubly fed induction generator, high voltage direct current, undersea DC cable

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