高次谐波对电抗变换器的影响

目前,部分继电保护装置采用电抗变换器以及低通滤波回路。分析了电抗变换器以及低通滤波回路的组成、数学模型以及对高次谐波的影响。得出电抗变换器显著放大了高次谐波,通过MATLAB仿真以及保护装置的实际波形,证明了电抗变换器对高次谐波的放大作用,并对以后的保护装置的开发提出了建议。

Influence of High-Order Harmonic on Reactance Converter

Currently some relay protection device converters use reactance converters and low-pass filters. This paper analyzes the composition and mathematical models of reactance converters and low-pass filters and their influences on higher harmonics. It is found that the reactance converter significantly enlarges the high-order harmonic, while the low-pass filter reduces the higher harmonic, but the AC circuit containing reactance converters enlarges the high order harmonic on the whole. The conclusions are proved by MATLAB and the waveform of the protection device. In addition, the paper proposes some suggestions on development of the protection devices in the future.