直驱式风力发电系统低电压穿越控制策略研究

Research on Low-Voltage Ride Through Control Strategy of Direct-Drive Wind Power Generation System

针对直驱式永磁风力发电系统的低电压穿越问题,提出一种新型的基于网侧并联逆变器的方案。阐述了其工作原理,建立直驱式永磁风力发电系统的模型,分析了该系统在电压跌落期间的运行特性。仿真结果表明,网侧并联的副变流器对于抑制直流侧母线电压、提高有功输出能力有明显作用,同时结合风电机组本身配置的Crow Bar电路,保证了风力发电机在规定时间内不脱网。

Aiming at the low-voltage ride through problem of direct-drive permanent magnet wind power generation system,this paperproposed a new type of scheme based on the parallel inverter at grid side,expounded its working principle,established a model of directdrivepermanent magnet wind power system and analyzed the operating characteristics of the system during the voltage drop period.Thesimulation results show that the parallel auxiliary converter at grid side plays an important role in suppressing the direct current busbar voltageand improving the active output capability.At the same time,CrowBar circuits of wind turbine generator configuration are combined toguarantee the wind turbine generator not be off-line within the required time.