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提出了一种电力有源滤波器补偿参考电流的倍频调制检测新方法。该方法的优点是不使用乘法器进行信号调制，降低了对输入低通滤波器的通频带要求，直流和偶次谐波分量对检测精度没有影响。尤其是它可以消除有限个低次奇次谐波对检测结果的影响。该检测计算电路实现简单，成本低，可广泛应用于单相、三相有源滤波器补偿参考电流的实时检测。仿真和实验结果证明了这种检测方法的有效性。
A new frequency multiplication modulation detection method based on active power filter for reference current compensation is proposed. The advantage of this method is that the signal is not modulated by the multiplier, which reduces the passband requirement for the input low-pass filter. The DC and even harmonic components have no effect on the detection accuracy. In particular, it eliminates the effect of a finite number of sub-odd harmonics on the test result. The detection and calculation circuit has the advantages of simple implementation and low cost, and can be widely applied to the real-time detection of the compensation reference current of the single-phase and three-phase active filters. Simulation and experimental results show the effectiveness of this method.