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提出一种基于预测控制的并联型有源电力滤波器(active power filter,APF)选择性谐波补偿方法。首先通过选择性谐波检测方法确定有源电力滤波器的参考电流值,并通过相位补偿降低系统延时的影响;然后在电流跟踪控制环节中引入预测控制,预测下一采样周期的参考电流值,并加入校正因子来消除预测误差;在此基础上计算出有源电力滤波器的参考电压矢量;最后利用空间矢量脉宽调制法(space vector pulse width modulation,SVPWM)控制三相逆变器的实际输出电压跟踪参考电压,从而达到选择性谐波补偿的目的。实验结果证明了该方法的有效性。
A new method of selective harmonic compensation for active power filter (APF) based on predictive control is proposed. Firstly, the reference current value of active power filter is determined by selective harmonic detection, and the influence of system delay is reduced by phase compensation. Then, the predictive control is introduced into the current tracking control to predict the reference current value of the next sampling period , And the correction factor is added to eliminate the prediction error. Based on this, the reference voltage vector of the active power filter is calculated. Finally, the space vector pulse width modulation (SVPWM) is used to control the three-phase inverter The actual output voltage tracking reference voltage, so as to achieve the purpose of selective harmonic compensation. Experimental results show the effectiveness of the method.