电网谐波电流小波变换实时检测研究

Real-Time Detection of Harmonic Current Wavelet Transform in Power Grid

摘要: 在对电网谐波治理和无功补偿时，需要实时检测分析电网中的谐波和无功电流，以便对电网中的谐波电流进行抑制和补偿无功功率。本文对小波变换算法在电网谐波电流检测中的应用做了研究，该算法利用mallat分解算法得到各频带的小波分解系数，然后将分解得到的小波系数进行单独重构，这样就可以分离出基波电流与各谐波分量。仿真与实验结果表明该方法可以很好的将基波电流与各谐波分离出来，能达到谐波电流实时检测的要求。

Abstract: In the harmonic control and reactive power compensation of the power grid, real-time detection and analysis of harmonics and reactive currents in the power grid are needed to suppress and compensate the reactive power in the harmonic current in the power grid. In this paper, the ap-plication of wavelet transform algorithm in power grid harmonic current detection is studied. The algorithm uses the mallat decomposition algorithm to obtain the wavelet decomposition coefficients of each frequency band, and then reconstructs the wavelet coefficients obtained by decomposition separately, so that the base can be separated. This allows the fundamental current and the harmonic components to be separated. The simulation and experimental results show that the proposed method can separate the fundamental current and each harmonic well, and can meet the requirements of real-time detection of harmonic current.