三相有源电力滤波器不定频滞环电流控制研究

Study on Indeterminate Frequency Hysteresis Current Control of Three-phase Active Power Filter

为改善传统滞环电流控制方法中开关损耗及开关频率过大的问题,对三相并联型有源电力滤波器的电容中点式主电路及工作原理进行分析,提出一种基于电压空间矢量脉宽调制的不定频滞环电流控制方法,该方法能够有效降低平均开关频率,减小误差电流。利用Simulink进行了系统仿真分析和实验,并对不定频滞环电流控制算法及滞环电流比较算法进行了对比研究,实验结果验证了该方法的可行性和有效性。

In order to improve switching loss and decrease average switching frequency in traditional hysteresis current control method ,the main circuit of mid-point capacitor for three-phase parallel active power filter and its working principle are analyzed, then a method of indeterminate frequency hysteresis current controlling based on voltage space vector pulse width modulation （SVPWM） is introduced, which can efficiently decrease the average Switching frequency and suppress the error current.A simulation model of control system is built and simulated in Simulink, the compari- son between indeterminate frequency hysteresis current control method and hysteresis current comparison method is conducted.The simulation and experimental results verify completely the feasibility and efficiency of the proposed method.