Voltage control of offshore wind farm considering reactive ability of electrochemical energy storage

With the integration of power electronic equipment, the voltage stability control of new energy based power system is increasingly complex. To improve the voltage stability of offshore wind farm, a voltage control method is proposed based on the reactive power coordination of wind farm and electrochemical energy storage. Firstly, this paper investigates the basic structure of offshore wind farm combined with electrochemical energy storage. Secondly, the control strategy of power conversion system (PCS) and reactive power operating region of wind farm are formed. Meanwhile, the detailed control method and reactive power operating region of electrochemical energy storage are also studied. Thirdly, to solve the problem of voltage variation of the point of common coupling (PCC), a novel voltage control method is proposed by coordinating the reactive power ability of offshore wind farm and electrochemical energy storage. Based on the actual offshore wind farm in Jiangsu Province, we build the simulation model in PSCAD. According to the simulation results, the proposed voltage control can improve the voltage stability with the utilization of energy storage under load fluctuation conditions.