基于HHT的风力发电系统电压暂降检测研究
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引用本文:边辉,孙屹岱.基于HHT的风力发电系统电压暂降检测研究[J].计算技术与自动化,2020,(2):46-49
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边辉,孙屹岱 (国华新能源有限公司河北 张家口 075000) 
中文摘要:风力发电系统输出具有随机性、波动性和间歇性等特点,风力发电系统电压波动较为频繁,电压暂降已成为风力发电系统中最常见的电压波动。针对风力发电系统电压暂降问题,提出了一种基于Hilbert-Huang变换(HHT)检测方法,能够准确、及时地检测到电压暂降。为了解决HHT中经验模态分解(EMD)过程中的端部效应问题,采用了一种自适应的改进波形匹配方法对电压暂降问题进行处理。借助HHT中各固有模态函数(IMF)的电压幅值和频率两个参数反映电压波动,并通过Matlab仿真验证了该方法的实用性。
中文关键词:Hilbert-Huang变换  风电系统  电压暂降  电压检测
 
Research on Voltage Sag Detection of Wind Power System Based on HHT
Abstract:In view of the random,fluctuating and intermittent characteristics of the wind power system output,the voltage fluctuation of the wind power system is relatively frequent,and the voltage sag has become the most common voltage fluctuation in the wind power system. Aiming at the problem of voltage sag in wind power generation system,a detection method based on Hilbert-Huang transform (HHT) is proposed,which can accurately and timely detect the voltage sag. In order to solve the end effect problem in the process of empirical mode decomposition(EMD) in HHT,an adaptive and improved waveform matching method is proposed to deal with the voltage sag problem. The voltage amplitude and frequency of each inherent modal function(IMF) in HHT are used to reflect the voltage fluctuation,and the practicality of the method is verified by Matlab simulation.
keywords:Hilbert-Huang transformation  wind power system  voltage sag  voltage detection
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