Study on low-voltage ride through capability of the offshore wind power integration based on super-capacitor energy storage

摘要

In order to avoid grid-unconnected operation of offshore wind turbine under grid faults. Aiming at the problem of fault ride through capability of offshore wind power system, proposing a low-voltage ride through (LVRT) scheme of offshore wind power system based on the super-capacitor energy storage system (SC_ESS). This paper studies on the control strategy of the converter and the SC_ESS in the process of LVRT of direct-driven permanent magnet synchronous generator (PSGM). Simulation models of the direct-driven permanent magnet wind power generation system that before and after super-capacitor energy storage unit added at DC side were established by using MATLAB/Simulink software and analysis of its low voltage ride through characteristics. Simulation results show that under system fault, the presented scheme can efficiently restrain the DC-link overvoltage, provide reactive power compensation to the power system, help grid recovery, and improve the LVRT capability of the power system.