基于安全电压的双馈风电机组高电压穿越判别方法

摘要

基于双馈风电机组的动态无功支持能力，在电网电压骤升时协调控制网侧变流器和发电机定子输出的无功功率，维持直流侧母线电压的安全稳定运行。根据DFIG直流侧电容的高电压穿越安全要求，定义了电网电压骤升时双馈风力发电机组接入电压的安全电压。然后基于安全电压给出了DFIG在电网电压骤升时能否实现高电压穿越的判断依据，并给出了其高电压穿越时的无功协调输出策略。仿真结果验证了所提的方法。%Based on the dynamic reactive power supporting ability of DFIG,the scheme proposed in this paper can be used to coordinate the reactive power outputs of the grid side converter (GSC)and the generator to maintain the safe operation of the DC capacitor. The safety value of the interface voltage of the DFIG is defined according to the high voltage ride-through requirements of the DC capacitor. Based on the safety voltage, the judgment basis is given to judge whether the DFIG can ride through the high voltage fault during the grid voltage swell,and the strategies of the reactive outputs of the grid side converter (GSC)during the high voltage ride-through are also given. The simulation results verify correctness of the proposed scheme.