单相并联型电力有源滤波器的仿真分析

由于电力有源滤波器能够克服无源滤波器的种种缺点而被公认为是一种能有效提高电能质量的装置。章从实用角度出发，着重对以下三种场合进行仿真分析：①系统阻抗值发生变化；②有源滤波器的启动过程；③负荷电流的突变过程。通过对单相并联型电力有源滤波器的仿真分析可以得出以下结论：①中所设计的电力有源滤波器对系统阻抗的变化有很好的适应性；②启动过程中的最大电流值比稳态运行时的最大电流值大得不多；③改进的PI调节方法对负载电流突变过程中维持逆变器直流侧电容电压稳定能够起到较好的作用。这些结果对三相电力有源滤波器的设计也有一定的参考价值。

SIMULATION AND ANALYSIS OF SINGLE PHASE SHUNT ACTIVE POWER FILTER

Because the active power filter can overcome such demerits of passive power filters as fixed compensation, large size and resonance, it is regarded as one of the equip- ment which can effectively improve power quality. From the viewpoint of practical application of active power filters, the authors perform simulation and analysis of active power filter in the following three aspects: the variation of system impedance, the startup of active power filter and the abrupt change of load current. Through the simulation and analysis of single phase shunt active power filter presented in this pa- per, the following results are obtained. (1) It has good ability to cope with the variation of system impedance, i. e., the harmonic compensation capability of the active power filter is insensitive to the system impedance. (2) The over current is bearable during the startup of the shunt active power filter. (3) The improved DC voltage PI regulation plays a good role in maintaining the voltage across the capacitor at DC side of the inverter with in a specified range. The improved dc volt- age PI controller displays better effect during the abrupt change of the load current. The obtained results are available for reference in designing active power filters.