主动移频式孤岛检测方法的参数优化-oalib.pdf

第 28 卷 第 1 期 中 国 电 机 工 程 学 报 Vol.28 No.1 Jan. 2008 2008 年 1 月 Proceedings of the CSEE ©2008 Chin.Soc.for Elec.Eng. 95 0258-8013 (2008) 01-0095-05 TM 92 A 470 40 文章编号： 中图分类号： 文献标识码： 学科分类号： ⋅ 主动移频式孤岛检测方法的参数优化 刘芙蓉，康 勇，段善旭，王志峰，王 辉 （华中科技大学电气与电子工程学院，湖北省武汉市 430074 ） Parameter Optimization of Active Frequency Drift Islanding Detection Method LIU Fu-rong, KANG Yong, DUAN Shan-xu, WANG Zhi-feng, WANG Hui (College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei Provonce, China) ABSTRACT: Anti-islanding protection is mandatory feature 0 引言 for grid-connected inverters. Desired islanding detection 孤岛检测是光伏(photovoltaic, PV)系统(及其他 method not only can detect islanding within acceptable duration, 分布式发电系统)并网时必须解决的技术问题，它指 but also require it has less adverse impact on power quality. The 在电网突然停止供电后，光伏发电装置能及时检测 performance of islanding detection method is usually subject to anti-islanding strategy and parameter setting. The paper 出电网的失电状态，并停止向失压的电网供电。在 analyzes non detection zone (NDZ) of active frequency drift 光伏电源的孤岛检测中，单纯的被动式检测方法容 (AFD) and active frequency drift with positive feedback 易漏检，因此常采用主动与被动相结合的方法，一 (AFDPF). Based on analysis the relationship between NDZ and 方面主动对逆变器输出施加扰动，另一方面，随时 feedback gain of AFDPF is deduced, which can be expressed as 检测公共点的电压、频率、谐波等的变化，从而判 a mathematics equation and gives range for feedback gain to 断电网的存在情况。既能广泛适用于各种负载，又 guarantee anti-islanding protection.