双馈感应风力发电机的电压/频率协调控制策略

Voltage/Frequency Coordinated Control Strategy of Doubly-fed Induction Wind Turbine

随着风电机组渗透率的不断提高,为抑制双馈感应风力发电机(DFIG)因自身有功输出波动导致并网后电压/频率波动,提出了一种基于分布式储能的DFIG惯量支撑与一次调频控制。在此基础上,分析DFIG机组的无功和电压调节能力,进而提出有功-频率和无功-电压的协调控制方案,所提策略兼顾风电机组的调频备用与发电效益,经济性较强。最后通过仿真实验表明,基于分布式储能的双馈风电机组充分参与系统调频,风机输出的有功功率能够及时响应有功负荷波动,提升一次频率调节能力,另外其输出的无功功率还可以跟随电压的波动进行相应的调整,明显改善发电机端口电压波动情况,为DFIG控制策略的改进与优化提供了新思路。

With the continuous improvement of the penetration rate of wind turbines,in order to suppress the voltage/frequency fluctuations of the doubly-fed induction generators(DFIGs)after grid-connected due to their own active power output fluctuations,aDFIGinertia support and primary frequencymodulation control based on distributed energy storage was proposed.On this basis,the reactive power and voltage regulation capability of DFIG units was analyzed,and a coordinated control scheme of active power-frequency and reactive power-voltage was proposed.Finally,the simulation experiment shows that the DFIG based on distributed energy storage fully participates in the system frequency regulation,and the active power output by the wind turbine can respond to the active load fluctuation in time,improve the primary frequency regulation ability of the system.In addition,the output reactive power can also be adjusted according to the fluctuation of the voltage,which can significantly improve the voltage fluctuation of the generator port,and provide a new idea for the optimization and improvement of the DFIG control strategy.