提高双馈风电机组高电压穿越能力的控制策略

Control Strategy of High-Voltage Ride-Through Capability Enhancement for Doubly Fed Wind Power Generator

为了提升风电场高电压穿越能力,提出了一种协调动态无功补偿装置(STATCOM)与网侧变流器(GSC)的无功功率控制。电网电压骤升期间,根据设计的高电压穿越方案,STATCOM能够协调GSC向电网提供大量的感性无功功率,吸收系统过剩的容性无功功率,保证风电机组高电压穿越期间不脱网运行,并降低了双馈风机的功率及转矩振荡。最后,通过在Digsilent建立仿真算例,验证了所提出的高电压穿越方案的可行性及有效性。

A coordinated control of the reactive power bewteen static synchronous compensators（ STATCOM） and the gird-side converters（ GSC） was put forward,by which,the high voltage ride through（ HVRT） capability of a DFIG-based wind farm was improved. To do this,STATCOM and the GSCs supply a large number of inductive reactive power to the grid coordinately,where the GSCs were fully utilized to provide the reactive power for the grid prioer the voltage chontrol operation. As a consequence,the DFIG could uninerruptable operation during the grid voltage swell fault,and the power and torque fluctuation of DFIG could be supperessed. Finally,the effectiveness of the popresed HVRT control scheme had been verified by Digsilent simulation results.