Intelligent joint optimization control method for improving frequency and voltage support of STATCOM/BESS wind power system

To solve the frequency fluctuation and PCC(Point of Common Coupling) voltage rising or dropping caused by the sudden change of load in wind power system, an intelligent joint optimization control method based on STATCOM/BESS(STATic synchronous COMpensator based on Battery Energy Storage System) is proposed. The method is divided into three layers in the implementation process, including real-time monito-ring layer, dynamic decision-making layer and execution control layer. The three layers are closely connected to form a reliable closed loop. Firstly, in the real-time monitoring layer, the wind speed division and fuzzy control are used to judge the frequency modulation capability, active and reactive power demands. Secondly, in the dynamic decision-making layer, the inertia constant and PCC voltage are comprehensively considered to dynamically optimize active and reactive power allocation strategies by combining with the reactive power adjustable range of wind turbine. Finally, in the execution control layer, the wind turbine and STATCOM/BESS execute the power commands. When STATCOM/BESS strengthens the virtual inertia, the SOC(State Of Charge) of BESS is considered, its working mode is dynamically adjusted based on SOC feedback, and the relevant parameters are fed back in time. Simulative results show that the proposed method can effec-tively improve the dynamic response of frequency and voltage, and improve the frequency and voltage support. © 2020, Electric Power Automation Equipment Press. All right reserved.