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针对配电系统中时有发生的并联电容器与电网阻抗之间谐振的现象,该文首先分析了传统的负载电流检测方式下并联型有源电力滤波器(parallel active power filter,PAPF)对系统谐振的抑制情况。分析表明,由于无功补偿电容器的影响,传统控制策略下的PAPF对系统谐振的抑制效果不理想,同时当检测的负载电流中包括无功补偿电容器电流时,系统还有可能出现不稳定的现象。针对这种情况该文提出了一种新的PAPF控制策略,该控制策略可以在进行谐波治理的同时有效抑制负载谐波电流或者系统谐波电压造成的并联电容器与电网阻抗之间的谐振。最后给出了实验验证结果。
Aiming at the phenomenon that the parallel capacitors and the grid impedance resonate in power distribution system, this paper first analyzes the effect of parallel active power filter (PAPF) on system resonance under the traditional load current detection method The suppression of the situation. The analysis shows that due to the influence of reactive power compensation capacitor, the PAPF under traditional control strategy can not effectively suppress the system resonance, and the system may also instability when the load current to be measured includes reactive compensation capacitor current . In this paper, a new PAPF control strategy is proposed in this paper. This control strategy can effectively suppress the resonance between shunt capacitor and grid impedance caused by load harmonic current or system harmonic voltage during harmonic control. Finally, the experimental verification results are given.