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为了提高三相四开关并联型有源电力滤波器(active power filter,APF)的性能,提出一种基于比例积分-并联矢量比例积分(proportional-integral and vector proportional integral,PI-VPI)电流控制器的网侧电流直接控制方法。通过采用网侧电流直接控制方法,省去了对负载电流和APF输出电流的检测,不但可以减少电流传感器的使用,而且可以降低谐波电流检测精度对APF补偿效果的影响;并将PI-VPI控制引入到电压、电流的双闭环控制策略当中,以提高谐波补偿的精度。实验证明该方法可以将电网电流谐波总畸变率降至5.38%左右,而且具有较快的响应速度。
In order to improve the performance of three-phase four-switch shunt active power filter (APF), a PI-VPI current controller based on proportional-integral and vector proportional integral (PI-VPI) Of the network side of the current direct control method. By using the direct current control method, the detection of load current and APF output current can be omitted, which not only can reduce the use of current sensor, but also reduce the influence of harmonic current detection accuracy on APF compensation effect. Control introduced into the voltage and current double closed-loop control strategy to improve the accuracy of harmonic compensation. Experimental results show that this method can reduce the total current harmonic distortion of the power grid to about 5.38% and has a fast response speed.