基于双PWM的兆瓦级风电机组并网控制策略的研究

针对兆瓦级永磁同步发电机组并网的控制要求,根据三相电压型PWM整流器开关函数的数学模型,本文提出了基于背靠背双PWM变流器的风力发电机组的并网控制策略,建立了该策略的等效电路模型,并重点研究了基于直接电流控制双闭环级联结构的三相电压型PWM整流器的控制策略。通过对该并网控制策略的等效电路进行仿真分析,网侧输出的三相交流相电流的总谐波畸变率仅为3.64%,电流波形正弦度良好,验证了该并网控制策略的可行性。

Research on the Grid Control Strategies of Wind Turbine Generator Based on Double PWM

For grid control of permanent magnetism synchronization generator,according to three-phase voltage source rectifier switching functions mathematical model,this article that proposed grid control strategy based on back to back double PWM rectifiers for wind turbine generators had established this strategy equivalent circuit model and emphatically studied the control strategy of three-phase voltage source rectifier,which has double closed-loop and cascade structure based on the direct current control.By the simulation analysis to this grid control strategy＇s equivalent circuit,current＇s total harmonic overtone distortion rate of the grid side output＇s three-phase AC interphase was only 3.64%,and its waveform was better.The new control strategy is proved feasible by Simulink simulation.