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有源电力滤波器(APF)主电路参数是影响补偿性能的决定性因素之一,对此研究了两个重要参数(直流侧电压和电容)的计算公式。分析了换相过程对三相桥式整流器带阻感负载的交流侧谐波电流的影响,推导出考虑换相重叠角的负载电流的表达式;在此基础上推导了直流侧电压设定值的计算公式;最后利用负载瞬时有功功率的交流分量是负载与APF之间交换的缓冲功率,推导出直流侧电容容量的计算公式。仿真和实验结果均证明理论推导的正确性和合理性。
Main circuit parameters of active power filter (APF) are one of the decisive factors affecting the compensation performance. The formulas of two important parameters (DC voltage and capacitance) are studied. The influence of commutation process on AC side harmonic current with three-phase bridge rectifier with resistive load is analyzed, and the expression of load current with commutation overlap angle is deduced. On the basis of this, the DC side voltage setting Finally, the alternating current component of load instantaneous active power is the buffer power exchanged between the load and APF, and the formula for calculating the capacitance of DC side is derived. Simulation and experimental results prove that the theoretical derivation is correct and reasonable.