新型空间矢量控制策略在APF中的应用与优化

Application and improvement of space vector control strategy in APF

为治理三相四线制系统中的谐波,以三相四桥臂变流器为主电路设计了有源滤波器。为实现有源滤波器的PWM控制,对该有源滤波器在αβγ坐标下的控制模型进行了分析,同时针对目前采用的一种基于滞环比较的空间矢量控制策略进行了详细分析,指出了该控制策略在三相四桥臂的有源滤波器应用中所具有的不足,在此基础上提出了一种新型的空间矢量控制策略。该新型空间矢量控制策略分别针对三相平衡和不平衡2种情况选择相应的空间矢量,以实现对三相四线制系统的谐波抑制。对该新型控制策略进行了分析,并且通过仿真分析和试验对比,验证了新型空间矢量控制策略的控制效果。

APF（Active Power Filter） base on three-phase four-leg converter is presented for the harmonic suppression of three-phase four-wire system. Its control model in αβγ coordinates is analyzed. The space vector control strategy based on hysteresis loop comparison is analyzed and its disadvantages are pointed out. Improvements are put forward,which selects the space vector table depending on the three- phase symmetrical or unsymmetrical load. The improved control strategy is analyzed and its control effectiveness is verified by simulation and experiment.