摘要最近几年，化石能源面临着枯竭的边缘，生活环境被污染，土地资源减少这类问题变的越来越严重。针对这种情况，利用分布式发电技术已经成为重点发展战略之一，这是因为分布式发电以太阳能、风能为代表，属于可再生能源。但同时，大电网的短路电流计算以及整定保护也会随着分布式电源的接入导致一系列的问题，新能源的高效率使用因此受到了严重制约。在这个背景之下，本论文主要围绕逆变型分布式电源故障特性展开研究和论述。85034

为了符合并网规程的需求，提出了一种逆变型分布式电源的双环控制策略。提出对称运行（三相短路）和不对称运行（两相短路）条件下的逆变型分布式电源的等值计算模型，计算了在满载情况下模型故障点的三相两相短路故障电流，利用光伏电池模型仿真结果验证了理论分析结果的正确性。此成果能够为分布式电源大规模接入后的配电网的电力系统继电保护性能的评价提供有力的参考。

毕业论文关键词：逆变型分布式电源；双环控制；故障电流特性；对称运行；不对称运行

毕业设计说明书外文摘要

Title  The Analysis And Application Of Inverter  Interface Distributed Generation                 

Abstract Recent years,fossil energy faces to dry up,the environment has been polluted and land resources have been reduced。These problems are becoming more and more serious。In view of this kind of situation,making use of the distributed power generation technology has become one of the key development strategy。Because distributed power generation technology belongs to renewable energy,and it is represented by solar and wind。However,as the access of inverter interfaced distributed generator,large short-circuit current calculation and setting of the distribution network will lead to a series of problems,new energy efficient use therefore has been restricted。In this context,this paper mainly revolves around research and discuss of inverter interfaced distributed generator。

In order to meet requirements of grid codes,this paper proposes a double loop control strategy of distributed power supply。On the basis of research and application of the relay protection,analyze voltage source inverter in the structure and working principle of double loop control,put forward the inverter interfaced distributed generator source model for calculating the equivalent under the symmetrical operation and unsymmetrical operation。Photovoltaic cells model simulation results validates the correctness of the theoretical analysis results。The results can provide effective reference for the relay protection performance of Inverter interfaced distributed generator。

Keywords: Inverter interfaced distributed generator,Double loop control,Fault current characteristic,Symmetrical operation,Unsymmetrical operation

目  次

1 绪论 1

1。1 课题研究背景和意义 1

1。2 大型配电网接入分布式电源对于潮流的影响 2

1。3 短路电流在接入分布式电源后会产生的影响 3

1。4 本论文研究的主要内容 3

2 含逆变型分布式电源故障点短路计算等效模型的分析 4

2。1 建立含逆变型分布式电源故障点短路计算模型 4

2。2 光伏电池的数学模型 4

2。3 最大功率点跟踪控制 7

2。4 扰动观察法