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为了实现对电力系统谐波的实时和精确补偿,该文提出了一种用于有源电力滤波器任意指定次谐波的检测方法以及基于该检测方法的闭环控制方法。这种有源电力滤波器由选择性谐波检测环节、电压控制和电流控制环节组成。为了补偿数字控制器和逆变器带来的延时,在检测环节中加入了预测补偿角。电压闭环控制方法借助检测环节实现了对谐波电流发生电路中逆变器直流侧的电压控制。电流闭环控制方法使得实际补偿电流精确地跟踪检测出的谐波指令电流。仿真结果验证了该控制方法的正确性,在采用上述方法后,电源电流得到根本的改善。
In order to achieve real-time and accurate compensation of power system harmonics, this paper presents a detection method for any specified subharmonic of active power filter and a closed-loop control method based on the detection method. This active power filter consists of selective harmonic detection, voltage control and current control. In order to compensate for the delay caused by the digital controller and inverter, a predictive compensation angle was added during the test. The voltage closed-loop control method realizes the voltage control on the DC side of the inverter in the harmonic current generating circuit by means of the detection link. The current closed loop control method allows the actual compensation current to accurately track the detected harmonic command current. The simulation results verify the correctness of the control method. After using the above method, the power supply current is fundamentally improved.