有源电力滤波器的自适应滞环电流跟踪策略

A Daptive Hysteresis Band Current tracking Strategy for Active Power Filter

针对有源电力滤波器(APF)传统滞环电流跟踪方式逆变器的开关频率高且频率范围大的问题,提出了一种可变环宽的滞环电流跟踪控制策略.该策略根据系统开关频率、直流侧电压、主电路电感等参数动态的调节滞环比较器的环宽,不仅能够有效的降低开关频率和频率变化范围,而且在跟踪精度和动态性能上也比传统滞环比较法优越.通过MATLAB仿真表明,该策略的电流跟踪精度满足有源电力滤波器的要求.

To overcome the drawback of the Traditional hysteresis band current tracking strategy ,which has high switching frequency and wide frequency range in the inverter ,a novel adaptive hysteresis band current tracking strat-egy for APF is proposed .The strategy changes the hysteresis band according to modulation frequency ,supply voltage , DC capacitor voltage and slope of the i＊c reference compensator current wave ,it not only can reduce high switching frequency and wide frequency range ,but also have advantages on tracking accuracy and dynamic performance .MAT-LAB simulation show that ：the current tracking accuracy of this strategy can meet the requirements of the active power filter .