用电负荷类型的增多及电力电子器件的广泛应用,使得电路中的非线性负载越来越多.这就造成了电网中产生了大量谐波源和功率损耗,给人们生产生活带来了很多的不便.为了更有效地解决电网中的谐波问题,提出了通过采用有源电力滤波器来补偿谐波电流的控制策略.该控制策略基于d-q坐标系,对谐波电流进行检测.采用PI-重复控制方法来实现无静差指定次谐波补偿,以消除谐波电流.将该控制方法与传统的PI控制进行比较,并分析了PI-重复控制方法的动态性能及稳态性能.仿真结果对比证明了PI-重复控制能很好地对谐波电流进行抑制.PI-重复控制作为一种便捷的控制策略,对谐波具有明显的消除作用,能很好地应用到生产、生活中.%Due to increased electricity load types and the wide application of power electronic devices,the nonlinear load in circuitry is getting more and more,which results in a large number of harmonic sources in power generation and large power loss,this brings inconvenience to the productionlife. Therefore,in order to solve the harmonic problem in the power grid,the control strategy of compensating harmonic current by using active power filter(APF) is put forward.Based on d-q coordinate system,the harmonic current is detected,and a PI-repetitive control method is proposed to realize the subharmonic compensation without static error,thus the harmonic current is eliminated.Compared with traditional PI control method, the dynamic performance and steady-state performance of the PI-repetitive control method are analyzed. Finally,comparison is carried out by simulation,the results show that the PI-repetitive control can restrain harmonic current very well,and PI- repetitive control, as a convenientcontrol strategy,can be applied to production life.
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