基于HHT的电能质量暂态扰动信号检测技术

Research on the Detection of Power Quality Transient Disturbance Signals Based on HHT

针对电网中暂态扰动信号难以检测这一难题,提出了一种利用HHT(希尔伯特-黄变换)进行处理的新方法。HHT通过经验模态分解法(EMD)和Hilbert变换,在检测非平稳信号的起止时间,频率和幅值有较好的效果。利用HHT分别对暂态谐波、电压中断、电压暂降和电压暂升4类典型的暂态扰动及其复合组合信号进行仿真验证,结果表明该方法可以较准确的实现对电能质量非平稳信号的分析和处理。该研究为电能质量信号的检测提供了新方法,为电网的治理开辟了新思路。

Aimed at the problem that the power quality transient data are difficult to be detected,a detection method of power quality transient disturbance signal based on HHT is proposed.The HHT method can effectively detect the start and end time,frequency and amplitude of the signal by empirical mode decomposition(EMD)and Hilbert transform.HHT can be used to analyze and deal with the typical transient disturbance of transient harmonics,voltage interruption,voltage sag and voltage transient,and the combination of these signal.The simulation results show that the proposed method can accurately analyze and deal with the non-stationary signal of power quality.HHT opens up a new idea for the detection and management of power quality.