基于HHT的微网电能质量检测

摘要

微电网中大规模使用的分布式电源、电力电子设备以及非线性负荷，会引起电压波动、过电压、欠电压以及电力谐波等诸多电能质量问题，对电网的安全稳定运行造成不利影响。对Hilbert－Huang Transform（HHT）方法进行了研究，并利用HHT方法检测微网电能质量，针对Empirical Mode Decomposition（EMD）分解过程中存在的端点飞翼问题及模态混淆问题，提出了相应的改进方法，加强了HHT的分析效果。仿真结果表明，改进后的HHT方法能够有效地检测出微电网中电压波动、电力谐波等电能质量问题。%The large-scale use of distributed power supply, power electronic equipment and non-linear loads in the micro grid may cause power quality issues such as voltage fluctuation, over voltage, under voltage and harmonic. These issues may threat the safe and stable operation of the micro grid. Studied Hilbert-Huang Transform (HHT), use HHT to detect power quality issues of the micro grid, and present the improved method of the end effect and the mode confusion of the Empirical Mode Decomposition (EMD), enhanced the analysis quality of HHT. The simulation results show that the improved HHT method is able to detect power quality issues of the micro grid such as voltage fluctuation and harmonic effectively.