主动移相式孤岛检测的一种改进的算法  

An Improved Active Phase-Shift Method for Islanding Detection

作　　者：刘芙蓉[1] 康勇[2] 王辉[2] 段善旭[2] 唐爱红[1] 

机构地区：[1]武汉理工大学自动化学院,武汉430070 [2]华中科技大学电气与电子工程学院,武汉430074

出　　处：《电工技术学报》2010年第3期172-176,共5页Transactions of China Electrotechnical Society

基　　金：台达科教发展基金资助项目(DREK200501)

摘　　要：孤岛检测是光伏系统并网必备的功能,要求既能快速检测出孤岛状态,同时又尽量减少对电网的不良影响。本文针对传统孤岛检测方法的不足提出了一种简单可行的改进方案。文章对新方案的工作机理和电网失压后频率偏移轨迹进行了分析,推导出特定负载下孤岛检测无盲区应满足的约束条件,使新算法的检测性能满足标准的要求。文章同时对主动移相式孤岛检测算法引起的电流畸变进行讨论,提供的参数选取方法能有效控制对电网的不良影响。Anti-islanding protection is a mandatory feature for grid-connected inverters. A desired method not only can detect islanding within acceptable duration, but also have less adverse impact on power quality. This paper analyzes the traditional phase-shift method for anti-islanding and proposes a new scheme which is easy to be implemented and has less adverse impact on power quality. The paper analyzes the deviation tendency of frequency in islanding and non detection zone （NDZ） of the scheme. Based on it a criterion for qualified anti-islanding is proposed, which helps to achieve grid-connected PV systems that meet the requirement of National Code.

关 键 词：主动移相 孤岛检测 并网光伏系统 

分 类 号：TM712[电气工程—电力系统及自动化]