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对并联型电力有源滤波器 ( APF)在电力系统发生各种短路故障时的行为进行了分析 ,得出了在系统发生故障期间 APF会发生过流现象的结论。在此基础上提出了一种新颖的过流保护方案 :逐周限流保护方案。这种保护方法的优点在于 ,当 APF发生过流期间 ,通过切脉冲将 APF电流限制在允许范围内 ,并使 APF在其能力范围内继续起到补偿的作用。通过仿真研究和实验证实了该保护方案的有效性和实用性
The parallel active power filter (APF) is analyzed in the event of various kinds of short-circuit faults in the power system, and the conclusion is drawn that APF will over-flow during the system failure. On this basis, a novel overcurrent protection scheme is proposed: a cycle-by-cycle current-limit protection scheme. The advantage of this method of protection is that the APF current is limited by the cut pulse within the allowable range during the overcurrent condition of the APF and that the APF continues to be compensated within its capabilities. The simulation results and experiments prove the effectiveness and practicability of this protection scheme