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提出了一种三相四线并联有源电力滤波器(APF)主电路的统一拓扑结构,建立了它的数学模型,并定义了衡量并联APF补偿性能的指标。在此基础上分析了2种电流滞环控制策略应用于三相四线并联APF时存在的本质缺陷,通过具体的仿真计算验证了所得到的结论,为改进三相四线并联APF的电流滞环控制策略提供了重要的理论依据。
A unified topology of the main circuit of three-phase four-wire shunt active power filter (APF) is proposed. Its mathematical model is established and an index to measure the compensation performance of parallel APF is defined. On the basis of the analysis, two kinds of current hysteresis control strategies are applied to the three-phase four-wire parallel APF, the inherent shortcomings. The simulation results verify the conclusions. In order to improve the current hysteresis of three-phase four-wire parallel APF, Ring control strategy provides an important theoretical basis.