电网友好型双馈感应发电机的暂态协调控制策略

Transient Coordination Control Strategy of Grid-friendly Doubly-fed Induction Generator

以风电运行"电网友好化"为背景,综合考虑电网友好型双馈感应发电机(DFIG)控制策略在应用中的相互影响并提出改进稳定控制策略。以满足并网导则要求的DFIG虚拟惯量控制、暂态有功控制与暂态无功控制3种电网友好型DFIG控制策略为对象,首先分析了暂态无功控制与暂态有功控制对于暂态有功给定的影响,其次分析了暂态有功给定对虚拟惯量控制效果的影响,最后分析了虚拟惯量控制对暂态无功控制效果的影响。在考虑以上3种影响的基础上,针对上述电网友好型DFIG控制策略在具体暂态阶段中相互制约的现象,从最终控制效果出发,提出能够同时改善送端系统在短路故障及其恢复过程中的功角稳定,减小故障期间电压跌落深度的综合控制方案,并通过时域仿真验证了影响分析与改进控制的正确性和有效性。

Based on the grid-friendly operation of wind power,this paper proposes an improved stability control strategy comprehensively considering the interaction of grid-friendly doubly-fed induction generator(DFIG)control strategy during the application.Taking the virtual inertia control(VIC),the transient active power control(TAPC)and transient reactive power control(TRPC)as research objects,the impact of TRPC and TAPC on the transient active power reference is firstly analyzed.Then the impact of transient active power reference on VIC,while the impact of VIC on TRPC is studied.Aiming at the phenomenon that the above grid-friendly DFIG control strategies are mutually restricted in a specific transient stage,this paper proposes an improved integrated control strategy that can improve the power angle stability of sending end system in the shortcircuit fault and its recovery process,and reduce the voltage sag depth in the fault from the perspective of final control effect.The time-domain simulation verifies the correctness and effectiveness of the impact analysis and the improved control strategy.