Coordinated Reactive Power Control of Hybrid Wind Farms

In order to use reactive power adjustment ability of Hybrid wind farm rationally, enhance voltage stability and fault ride-through capability of grid-connected wind power, a reactive power control strategy is proposed. In this paper, reactive power adjustment ability of DFIG and PMSG are analyzed, selecting SVG as the dynamic compensation device. Reactive power demand of wind farm can be calculated based on the deviation of reference voltage and PCC voltage. Based on the reactive power compensation, control strategies are as follows: In steady state, three-level reactive power allocation can coordinate the use of Hybrid wind farm and SVG reactive voltage capability to improve voltage stability; Power system fault, combined with pitch angle control and energy storage device to improve fault ride-through capability of wind farm. Finally wind farm access system model is established and simulation verifies the correctness of the proposed control strategy.