基于小波理论的微电网电能质量检测方法应用

摘要

Micro gird is a new type power grid structure with distributed power generation as main body, which is hot issue of smart grid development and research. Due to micro grid electric power quality is liable to be comprehensively influenced by new energy features, inverters features and load transient behavior, it has characteristics of sudden change, easily disturbed and fierce volatility, which requests fast speed and high accuracy of micro grid electric power quality inspection. Focused on characteristics of micro grid electric power quality, the author uses wavelet theory to inspect micro grid electric power quality. Through wavelet transform theory to de-noising sampled signal, wavelet phase method to perturbation localization and wavelet energy threshold method to identify micro grid electric power quality mutation category. It finally verifies inspection method by building model simulation according to actual micro grid.%微电网作为以分布式发电为主体的新型电网结构，已成为智能电网发展和研究的热点问题。由于微电网电能质量受到新能源特性、逆变器特性和负荷的暂态特性共同影响，具有了变化突然、易受扰动影响、波动剧烈等特点，这就要求对微电网电能质量检测提出了速度快，精度高的要求。针对微电网电能质量特性，利用小波理论对微电网电能质量进行检测。通过小波变换理论进行采样信号的消噪、利用小波相子法进行扰动定位，再利用小波能量阈值法对微电网电能质量突变类别进行识别，最终通过对实际微电网进行建模仿真进行了该检测方法的验证。