Reactive power coordinated control scheme of double fed wind farm under grid fault

Abstract

This paper proposes a reactive power coordination control scheme combines doubly fed induction generator (DFIG) with static synchronous compensator (STATCOM) on the basis of considering the limited reactive power of DFIG. It takes the voltage stability of point of common coupling (PCC) as the target to determine the required reactive power value, which is a priority to select DFIG to compensate reactive power, and the surplus reactive power demand is supplemented by STATCOM. The reactive power regulation of DFIG needs to be realized by controlling the rotor side converter (RSC) and the grid side converter (GSC), and the reactive power command value of DFIG is distributed between the RSC and the GSC according to the maximum reactive power capacity. This method not only can make full use of the reactive power regulation of DFIG itself, but also can reduce the capacity of reactive power compensation device. Simulation results based on Matlab/Simulink verify the effectiveness and superiority of the proposed scheme.