改进的正反馈主动频移式孤岛检测方法  

Improved Active Frequency Drift with Positive Feedback Islanding Detection Method

作　　者：黎璋霞 罗晓曙[1] 廖志贤[1] 陈亚欢 

机构地区：[1]广西师范大学电子工程学院,桂林541004

出　　处：《电力系统及其自动化学报》2015年第4期13-17,共5页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(11262004);广西科学研究与技术开发项目(桂科攻1348017-2);广西壮族自治区研究生教育创新计划项目(YCSZ2012061)

摘　　要：孤岛效应是光伏并网逆变器发电系统中存在的一个基本问题。对孤岛效应的检测必须准确而快速,同时孤岛检测的方法应该尽量减小对电能质量的影响。该文阐述了主动频移AFD(active frequency drift)检测法和正反馈主动频移AFDPF(active frequency drift with positive feedback)检测法的基本原理、分析了AFDPF的检测盲区,并在此基础上提出一种改进的AFDPF检测法,即以分段函数的方式施加扰动来达到频移的方法。最后在Matlab/Simulink平台进行仿真实验,验证了该改进的AFDPF检测法不仅具有可行性,而且降低了电流谐波失真度THD(total harmonic distortion),即减小了扰动对电能质量的影响。Islanding is a basic problem of photovoltaic grid-connected inverter generation system. Islanding detection must be accurate and fast, and should deduce its negative influence on the power quality as much as possible.In this paper, the basic principles of active frequency drift （AFD） method and active frequency drift with positive feedback （AFDPF） method are expounded, the non-detection zone（NDZ） of AFDPF method is analyzed. And on this basis, an improved AFDPF method is proposed, which achieves frequency shift by a disturbance that are expressed by piecewise function. At last, this improved method is simulated on Matlab/Simulink platform. The result indicates that the improved AFDPF method is effective and reduces total harmonic distortion（THD）.

关 键 词：光伏并网逆变器 孤岛检测 正反馈主动频率偏移检测 检测盲区 谐波失真度 

分 类 号：TM464[电气工程—电器]