HHT的改进及其在电压闪变分析中的应用

Improvement of HHT and its Application in Voltage Flicker Analysis

介绍了Hilbert-Huang变换方法在电压闪变分析中的应用,该方法利用经验模态分解法EMD将电压波动信号分解成有限个固有模式函数IMF,再运用概率大值统计方法实现电压闪变的分析。对Hilbert-Huang变换方法进行了一些改进:对EMD分解的停止条件进行改进,加快了收敛速度;对EMD分解过程中的端点抖动问题采用端点镜像法消除;对虚假分量采用相关系数法进行消除。试验结果表明,改进后的Hilbert-Huang变换方法提高了分析准确度。

This paper introduces the application of Hilbert Huang transform method in the analysis of voltage flicker.In this method,EMD is used to decompose the voltage fluctuation signal into finite intrinsic mode function IMF,and then the statistical method of probability large value is used to realize the analysis of voltage flicker.The Hilbert Huang transform method is improved:the stop condition of EMD decomposition is improved to accelerate the convergence speed;the endpoint jitter problem in EMD decomposition is eliminated by endpoint mirror method;the false components are eliminated by correlation coefficient method.The experimental results show that the improved Hilbert Huang transform method improves the accuracy of the analysis.