基于模糊控制的新型主动移相式孤岛检测方法  

A novel active phase-shifting islanding detection method based on fuzzy control

作　　者：方小妹 宋树祥[1] 蒋品群[1] 罗晓曙[1] 廖志贤[1] 

机构地区：[1]广西师范大学电子工程学院,广西桂林541004

出　　处：《电力系统保护与控制》2014年第20期19-24,共6页Power System Protection and Control

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计划(合同编号:桂科攻1348017-2);广西教育厅科学研究项目(201203YB021)~~

摘　　要：孤岛效应是光伏并网发电系统必须要解决的基本问题之一。针对传统主动移相式孤岛检测方法存在检测盲区及对输出电能质量影响较大的问题,通过分析传统方法中参数与检测盲区的关系,并基于模糊控制,提出了一种新型主动移相式孤岛检测方法。根据孤岛发生时公共耦合点电压频率的变化情况,对改进方法中的参数k进行自适应调整。基于Matlab/Simulink的仿真结果验证了该方法不仅能准确快速地检测出孤岛,而且进一步减小了检测盲区,同时也减小了扰动对电能质量的影响。逆变器输出电流畸变相对于传统方法降低了0.48%。Islanding effect is one of the basic problems of photovoltaic grid-connected systems that must be resolved. Against the traditional active phase-shifting islanding detection method which has the problems of non-detection zone and a greater influence on the output power quality, by analyzing the relationship between the parameters and the non-detection zone of traditional detection method, and based on the fuzzy control, this paper proposes a novel active phase-shifting islanding detection method. The parameter k of the method is adjusted adaptively according to the change situation of frequency of voltage at the point of common coupling when the islanding occurs. Matlab/Simulink simulation results demonstrate the method not only can detect the islanding accurately and quickly, but also reduce the non-detection zone, and at the same time reduce the impact of disturbances to power quality. The inverter output current distortion is reduced by 0.48% compared with the traditional method.

关 键 词：光伏并网发电 孤岛检测 主动移相 检测盲区 模糊控制 

分 类 号：TM615[电气工程—电力系统及自动化]