摘要随着包含传统和可再生能源技术的分布式发电所占比例越来越高，电力系统发生的变化也越来越大，电力系统的发展趋势也日渐清晰。即电力系统包含大量储能系统、能够在孤岛模式下工作并且能够通过柔性输电系统相连接的主动式电网。由于分布式发电规模不同以及电力系统互联程度存在差异，不同的复杂区域对分布式发电单元的要求也有所区别。那么对于拥有大量分布式发电的电力系统而言，能够及时检测出孤岛状态是非常重要的。84685

本文从分布式发电的概念与孤岛效应发生的机理出发，阐述了孤岛效应发生的可能性与发生的必要条件。根据国际上孤岛检测的检测标准和测试电路，综合评价了现有孤岛检测方法的优缺点与适用范围。选取了主动式频率偏移类检测方法进行深入研究。最后，本文利用MATLAB/SIMULINK软件模拟简易的光伏并网逆变器发电系统，根据检测原理对AFD、AFDPF检测法分别进行仿真验证。

毕业论文关键词：分布式发电 孤岛检测 主动频率偏移法 盲区检测 

毕业设计说明书外文摘要

Title         Study of Islanding Detection Algorithm Based on    PV Grid                       

Abstract With the increasing proportion of distributed generation including traditional and renewable energy technologies, power system also changes too much。 The development trend of the power system has become more clear, that is the Active grid which contains a large energy storage system, has the ability to operate in island mode and can be connected by a flexible transmission system。 Depending on the size of distributed generation and level of power system interconnection, different complex region has different requirements of distributed power generation unit。 So, for the power system with a large number of distributed power generation, it is very important that detecting the islanding state timely。

This article explains the concept of the distributed generation and the cause of the islanding, according to islanding detection of international testing standards and testing circuit, summarized and evaluated the many domestic and foreign anti-islanding technologies in the past decade。 Among the methods frequency-drift techniques are best choice。 Finally, we use MATLAB/SIMULINK software to simulate a simple PV grid-connected inverter power system, based on the detection principle of AFD, AFDPF assays were performed simulation。

keywords: distributed generation, islanding detection, frequency-drift algorithm, grid-connected PV system, non-detection zone

目   次

1 绪论 1

1。1 研究意义 1

1。2 研究现状 2

1。2。1 分布式发电的应用现状和发展趋势 2

1。2。2 孤岛检测的发展现状 2

1。3 本文主要研究内容 3

2 孤岛检测的基本问题 4

2。1 孤岛发生的机理 4

2。2 孤岛检测的基本原理 4

2。3 本章小结 6

3 常用的孤岛检测方法 7

3。1 电网-本地检测方法 7

3。1。1 电力线载波通讯法 8

3。1。2 连锁跳闸法 8

3。2 逆变器-本地检测方法