Abstract
The voltage source converters based multi-terminal (MT) HVDC systems perform a vital role in DC power transmission of large offshore wind farms (OWFs). The voltage current (E-I) and voltage-power (E-P) converter characteristics based droop control methods are widely adopted by wind farm operators in order to transmit wind power to the onshore AC grids. This paper deals with the optimization of droop gain settings for these control methods which not only facilitate the optimal power flow (OPF) in large offshore wind farms but also simultaneously satisfies all the physical constraints of the MT-HVDC systems connected to OWFs. The proposed optimization method is implemented upon four terminal HVDC system. The simulation results are obtained for different operating conditions of OWFs. These simulation results show that by optimizing the converter's droop gain settings, DC power losses in MT-HVDC systems could be reduced significantly.
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