摘要近年来太阳能得到了广泛的应用，并网光伏发电系统也日益增多。作为光伏并网的必备功能，孤岛检测必不可少。本文围绕光伏并网发电系统的孤岛检测问题做了重点的分析与研究。

    本文大致介绍了光伏发电原理及国内外现状和趋势；阐述了孤岛发生的原理和影响、国内外检测标准；介绍了常用的被动式孤岛检测和主动式孤岛检测的方法；阐述了主动移频法的孤岛检测的原理，用Matlab搭建模型，指出 , 的变化对反应时间的影响。最后阐述了常用的盲区表示方法及优缺点，在此基础上对主动移频的AFD和AFDPF的盲区进行了分析，画出了盲区分布图，分析并验证了AFD和AFDPF的检测盲区，精确计算了AFDPF的盲区准确性。67658

毕业论文关键词   光伏并网系统  孤岛检测  主动移频  检测盲区

毕业设计论文外文摘要

Title  Study on Islanding Detection of Grid-connected Photovoltaic Inverter Based on Frequency Shift Method        

Abstract

In recent years, the solar energy has been widely applied,grid-connected photovoltaic power generation systems is increasing.As an essential function of the PV grid-connected, isolated island detection is essential.The analysis and Research on the key of islanding detection problems on photovoltaic grid-connected generation system.

    This paper introduces the photovoltaic power generation principle and the domestic and foreign status and trends;The island of principle and effects of domestic and international testing standards;Introduces the passive and active common method of islanding detection. Describes the principle of islanding detection of active frequency drift method,builds model using Matlab,pointed out effects of cf and k on reaction time.Finally elaborated the common representation methods and the advantages and disadvantages of the NDZ,on the basis of the active frequency drift of the AFD and AFDPF NDZ are analyzed, to draw the NDZ distribution map,analysis and verify the detection NDZ of AFD and AFDPF, the precise accuracy of NDZ of AFDPF is calculated.

Keywords  Photovoltaic grid-connected system    Islanding detection      The active frequency drift    Non-Detection Zone

目   次

1  绪论 1

1．1  研究意义 1

1．2  光伏发电现状及趋势 1

1．3  光伏发电系统简介 3

1．4  本文选题意义及主要研究内容 5

2  光伏并网发电系统的孤岛效应检测 5

2.1  孤岛效应简介 6

2.2  孤岛效应的检测 7

2.3  本章小结 12

3  主动移频孤岛检测的Matlab仿真及盲区分析 13

3.1  仿真背景介绍 13

3.2  主动移频（AFD）法孤岛检测仿真 16

3.3  正反馈主动移频（AFDPF）法孤岛检测仿真 21

3.4  孤岛检测盲区 25

3.5 孤岛检测盲区分析及验证 28

3.6 本章小结 42

4  本文工作的总结与展望 42

4.1 本文工作总结