多机光伏并网逆变器的孤岛检测技术.PDF

2010 年 1 月 电 工 技 术 学 报 Vol.25 No. 1 第 25 卷第 1 期 TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Jan. 2010 多机光伏并网逆变器的孤岛检测技术 刘方锐 段善旭 康 勇 张 宇 （华中科技大学电气与电子工程学院 武汉 430074 ） 摘要 随着分布式发电的迅速发展，越来越多的可再生能源被转化为电能通过并网逆变器输 送到电网。并网逆变器要求具备孤岛检测功能，通常对其输出施加一定的扰动以提高孤岛检测能 力。目前对光伏并网逆变器的研究主要集中于单机，而本文从多机并网运行的角度对孤岛检测方 法进行了研究。针对并网逆变器所常用的移频与移相两类主动孤岛检测技术在多逆变器并联工作 下的相互联系及内在影响进行了深入分析。同时给出这两类方法下的逆变器孤岛检测设计注意事 项及孤岛算法参数选取方法，从而为多机光伏并网逆变器孤岛检测提供了理论指导。 关键词：并网逆变器 光伏 孤岛检测 移频 移相 中图分类号：TM46 Islanding Detection Methods for Multiple PV Converters System Liu Fangrui Duan Shanxu Kang Yong Zhang Yu （Huazhong University of Science and Technology Wuhan 430074 China ） Abstract Due to the development of distributed generation, grid-connected converters are widely employed for renewable energy sources utilization. The islanding detection is a mandatory function for such converters. It usually injects perturbations in the converters’ output to improve islanding detection effectiveness. The current research is mainly focusing on the islanding detection of individual converter. This paper is dedicated to investigating the strategies for multiple PV grid-connected converters operation. The characteristics of normally used active frequency shift and active phase shift islanding detection methods in multiple converters system are explored. The design principle and parameters selection rule of the two strategies are also presented. It provides basic islanding detection design guidance for multiple PV grid-connected converters system. Keywords ：Grid-connected converter, PV, islanding detection, frequency shift, phase shift 网维修人员的安全