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通过对基于瞬时无功功率理论的一种谐波电流检测方法的研究，利用ＭＡＴＬＡＢ仿真软件建立了相应的仿真电路，就其中的低通滤波器对谐波电流检测效果的影响进行了仿真研究．结果表明，低通滤波器的截止频率、阶数和类型对检测电路的动态响应过程、检测精度都有很大影响．文中的仿真研究结果能为设计谐波检测电路提供指导．
Through the research of a harmonic current detection method based on instantaneous reactive power theory, the corresponding simulation circuit is established by using MATLAB simulation software, and the influence of the low-pass filter on the detection effect of harmonic current is simulated. The results show that the cut-off frequency, order and type of the low-pass filter have a great influence on the dynamic response of the detection circuit and the detection accuracy. The simulation results in this paper can provide guidance for the design of harmonic detection circuit.