基于离散小波变换的分布式发电孤岛检测方法  

Islanding detection based on discrete wavelet transform for distributed generation

作　　者：贺眉眉[1] 李华强[1] 陈静[1] 魏宏芬[1] 林茂君[1] 

机构地区：[1]四川大学电气信息学院智能电网四川省重点实验室,四川成都610065

出　　处：《电力自动化设备》2012年第10期103-108,共6页Electric Power Automation Equipment

摘　　要：在被动式孤岛检测技术的基础上,提出一种新的基于离散小波变换的孤岛检测方法。根据公共连接点(PCC)逆变器侧和主网侧电能质量不相等的原理,通过对PCC处电压进行小波变换提取出孤岛发生的特征谐波高频信号,理论上通过微观变量的提取和识别可彻底消除非检测区。在MATLAB/Simulink环境下,搭建3套分布式发电系统,仿真结果验证了所提方法的正确性,并表明在电网电压波动以及各类型负荷运行、投切等扰动下,检测装置不会误动作,能够迅速检测到孤岛的发生。Based on the technology of passive islanding detection,a method of islanding detection is proposed which applies the discrete wavelet transform. According to the principle that the inverter-side power quality is unequal to the grid-side power quality at PCC,the characteristic harmonic high-frequency components of islanding can be extracted by the wavelet transform of voltages at PCC. Theoretically,the non-detection zone can be thoroughly eliminated by the extraction and identification of microscopic variables. Three types of distributed generation system are set in the environment of MATLAB/Simulink and simulative results show that,the existence of islanding is rapidly detected and the detection device functions properly under different operating conditions：voltage disturbance,different load types,load on-off switching, etc. ,which verifies the correctness of the proposed method.

关 键 词：分布式发电 孤岛检测 离散小波变换 被动检测 微观变量 

分 类 号：TM91[电气工程—电力电子与电力传动]