一种新的三相光伏并网系统孤岛检测方法

作者：薄涛,杨滔,吕征宇 日期：2008-11-03/span> 浏览：3088 查看PDF文档

一种新的三相光伏并网系统孤岛检测方法

薄涛,杨滔,吕征宇
（浙江大学 电气工程学院，浙江 杭州 310027）

摘要：基于三相光伏并网逆变器论述了反孤岛效应策略，同时，为了进一步缩小不可检测区(NDZ)的范围，提出了一种正反馈频率偏移法与正反馈电压偏移法相结合的孤岛检测方法，并阐述了该方法的原理。利用Matlab/Simulink软件对其进行了系统建模与仿真研究，并根据仿真结果搭建测试电路，对并网逆变器的反孤岛控制能力进行了测试，实现了非检测区域的进一步减小。实验结果表明，该方法在100 ms内可有效地检测出系统的孤岛状态。
关键词：孤岛检测；频率偏移；电压偏移；不可检测区
中图分类号：TM46文献标识码：A文章编号：1001-4551(2008)09-0034-03

A new technique on islanding detection of threephase gridconnected photovoltaic inverter
BO Tao, YANG Tao, LV Zhengyu
(College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)
Abstract: Based on the threephase gridconnected photovoltaic inverter, the antiisland protection strategy was discussed. In order to reduce the nondetection zone(NDZ), a new frequency drift with voltage drift technique was proposed. The simulation model of system was established in Matlab/Simulink, and the experiment was researched according to the simulation, the reduction of NDZ was realized. The experimental results prove that the islanding can be detected effectively within 100 milliseconds by new technique.
Key words: islanding detection; frequency drift; voltage drift; nondetection zone(NDZ)