基于不定频滞环空间电压矢量的有源滤波器电流控制策略研究

Current control strategy of active power filter based on the indefinite frequency hysteresis space voltage vector

为了提高并联型有源电力滤波器的电流跟踪性能,提出一种基于不定频滞环空间电压矢量的电流控制策略。在该策略中,控制对象选取为实际补偿电流与指令值的跟踪误差,在结合电压、电流两组矢量的空间区域的分布的基础上,给出最佳的电压矢量切换方式,实现不定频滞环空间电压矢量的电流控制,从而使电流跟踪的误差限制在滞环宽度以内。Matlab仿真和实际试验结果都表明此法能消除相间影响,抑制电流的畸变量,在降低开关频率条件下,提高有源滤波器的电流跟踪性能。

To improve the current tracking performance of shunt active power filter, a current control strat- egy based on variable frequency hysteresis loop space voltage vector is proposed. In this strategy, the control object was selected as the tracking error of the actual compensation current and the command val- ue. On the basis of being combined with the regional distribution of the voltage and current vector space, the best voltage vector switching mode was given. The indefinite frequency hysteresis current control of the ring space voltage vector was achieved so that the current tracking error was limited within the width of hysteresis. The results of Matlab simulation and actual test show that this method eliminates the mutual influence of the phases and suppresses the current distortion. And under the conditions of reducing the switching frequency, the current tracking performance of the active filter is improved.