并联有源电力滤波器不定频滞环SVPWM控制与滞环控制的比较

Comparison of Indeterminate Frequency Hysteresis SVPWM Control and Hysteresis Control for Shunt Active Power Filter

针对并联有源电力滤波器(active power filter,APF)传统滞环控制的不足,将滞环控制与电压空间矢量脉宽调制(space vector pulse width modulation,SVPWM)相结合,提出了一种基于不定频滞环的SVPWM电流控制策略。该方法的显著特点是通过识别参考电压矢量和电流误差矢量区域控制滤波器的输出,避免了复杂的计算和逆变器不必要的开关,并且可以减少高次谐波、加快响应速度。然后分析了与滞环控制的区别。最后仿真结果表明在补偿效果、开关频率和直流电压利用率方面,不定频滞环SVPWM控制比滞环控制均具有一定优势。

To overcome the deficiency of conventional hysteresis control of shunt active power filter（APF）, hysteresis control and space vector pulse width modulation（SVPWM） were combined, thus, a strategy of voltage SVPWM current controlling based on indeterminate frequency hysteresis was proposed. By identifying the locations of reference voltage vector and current error vector to control the filter＇s outputs, complicated calculation and unnecessary switching inverter were eliminated, and high-order harmonics were decreased and responding velocity was promoted. Then the differences between hysteresis control and method of this paper were analyzed. Finally, the results of simulation show that indeterminate frequency hysteresis SVPWM control has more advantages than hysteresis control on the hands of compensation effect, switching frequency and DC voltage utilization.