一种并联型有源滤波器容量确定的新方法

并联有源滤波器补偿容量的确定方法直接决定实际补偿效果和设备成本，工业现场以最大负载谐波电流确定滤波器容量．由于补偿后负载谐波发生变化，出现补偿不完全现象。部分工程现场根据1．5～2倍的负载谐波最大电流确定滤波器容量，补偿效果较好，但是设备利用率低。首先建立有源滤波器补偿系统的简化模型，通过理论分析和数学推导得到补偿前后负载谐波电流间的关系，从原理上给出当前容量选择出现误差的原因，进一步分析，得到一种实用的并联型有源滤波器补偿容量的确定方法，并通过仿真验证了本文理论分析的合理性、

A New Method for Capacity Design of Parallel Type Active Power Filter

Parallel type active power fiher （APF） is considered as the most effective method to restrict harmonic, while its effects and equipment costs are determined by the design capacity. In industrial application, the APF＇s capacity is designed according to the maximum of load harmonic current, so il＇s hard to completely compensate in general. In order to fillly restrict the harmonic current, the eapaeily is 1.5 to 2 times of the maximum harmonic eurrenl. In this way. there will be a seriously waste of＇ resources. This paper establishes the simplified model of the shunt active power filter. Through the theoretical analysis and mathematical derivation, a practical method to design the APF＇s capacity is presented, and the effectiveness of this method is proved by simulation.