（毕业设计论文）《并网逆变器孤岛检测技术研究》.doc

PAGE 南京邮电大学 毕 业 设 计（论 文） 题 目 并网逆变器孤岛检测技术研究 专 业 学生姓名 班级学号 指导教师 指导单位 摘 要 随着新能源发电的迅速发展，越来越多的可再生能源被转化为电能通过并网逆变器输送到电网。当电网由于故障而断网时，容易产生孤岛现象。孤岛现象的发生可能会带来巨大危害,因此,研究孤岛效应及其检测方法具有重要的现实意义。本文首先对分布式发电系统的概念，分类及发展现状进行介绍，从而引出分布式发电系统的核心部分—逆变器。然后对逆变器的原理、拓扑结构、控制方法等进行了研究，并最终选择了双降压桥式逆变器作为设计的对象。在接下来的章节中，本人具体介绍了并网逆变器孤岛检测的多种方法及其优缺点，并对它们的盲区边界进行计算。 基于对各种孤岛检测方法的分析，本文研究了一种有功电流全扰动孤岛检测方法,详细介绍了该方法的原理和实现过程,并结合IEEE.Std.2000-929标准中的技术规范对仿真模型进行了分析,验证了此类方法的有效性和适用性。 关键词：并网逆变器；孤岛检测；主动孤岛检测技术；有功电流全扰动 ABSTRACT With the rapid development of new energy power generation, more and more renewable energy is converted into electric energy through the grid-connected converters. Grid inverter with islanding detection function, the photovoltaic grid-connected inverter research mainly focused on the single, usually on the output must exert the disturbance to improve islanding detection ability. This paper bases on grid—connected system as research obj ect and focuses on single-phase grid—connected systems to conduct a comprehensive analysis，and then．does a detail analysis and simulation、from the main circuit topology of grid-connected system，control strategies，system parameters，anti—island effect as well as reliability analysis．.At the same time it gives some methods of inverter islanding detection design considerations and islanding algorithm parameter selection method, and their blind spot boundaries calculated. In this paper, an active current full disturbance islanding detection method is accepted based on the analysis of all kinds of islanding detection methods.while detailly described the principle and process of the method. The result shows that the method iS feasible and up to the demand of IEEE Std.2000—929． Keywords: Grid-connected inverter; islanding detection ;Active islanding detection technology; Active current full disturbance 目 录 摘 要………………………………………………………………………Ⅰ ABSTRACT……………………………………………………………………Ⅱ 第一章 绪论………………………………………………………………1 1.1分布式发电系统……………………………………………………………………1 1.