永磁风力发电机三相PFC整流器控制策略

Three-phase PFC rectifier with current control for PMSG wind generation systems

针对用于变速恒频风力发电的永磁同步发电机(PMSG),采用每相定子绕组由一个单相功率因数校正(PFC)电路进行整流的拓扑结构,提出了一种同步比例积分(PI)控制策略。根据PMSG运行工况和PFC主电路拓扑结构的特点,选取整流控制目标为发电机定子电流与端电压同相位,并依此设计了控制系统。利用同步旋转坐标变换将电机定子电流变换为直流量进行控制,消除了传统方法中各相PFC电路分别使用一个PI调节器对交流电流进行调节所存在的稳态误差。仿真和实验表明:该控制策略既能稳定直流输出电压,亦能保持发电机三相电流波形正弦,并与机端电压基波同相位。

A synchronous proportional integral（PI） current control strategy was developed based on a three-phase power factor correction（PFC） rectifier consisting of three single-phase PFC circuits for each phase of a permanent magnetic synchronous generator（PMSG）.The current control keeps the stator phase current and voltage in phase.The stator alternating currents are transformed to direct currents in the synchronously rotating reference frame,so the PI regulators give zero steady-state error in the fundamental currents.Simulations and experiments verify that the steady DC output voltage and the sinusoidal AC currents are in phase with the fundamental voltages of the PMSG with this control technique.