1、 毕业设计（论文） 并网逆变器孤岛检测研究 学院（系） ： 自动化学院 专 业： 电气工程及其自动化 班 级： 学 生 姓 名： 指 导 教 师： I 摘 要 随着社会的发展，人口不断增多，资源利用率增长，随之也出现许多不良的现象，导 致化石能源危机，并且会日益严重的危害自然环境，能源危机对消费者以及社会造成许多 深远的影响。于是越来越多的可再生新能源和其利用技术开始不断出现和发展，太阳能、 风能等清洁且存量巨大的可再生能源出现在人类的视野中。电能紧缺一直是一个非常严峻 的问题，光伏并网发电有望在未来缓解这一紧张的局面，基于并网的分布式发电技术将会 是电力行业发展的一个重要方向。 但当越来越多
2、的光伏发电系统并接入电网时， 当电网由于故障或者其他问题而断网时， 就会容易产生孤岛现象。一旦孤岛效应在分布式发电系统中发生，将会对维修人员产生伤 害，同时会影响系统的稳定运行。所以研究怎样能够快速的检测到并网系统是否产生孤岛 效应以及相对其作出反应就具有了非常重要的意义。 本文首先对分布式发电系统进行了详细说明，进而引出分布式发电系统的孤岛问题， 并对孤岛效应的危害，国内外的保护问题进行了阐述，接着重点说明了孤岛效应的检测问 题以及各个保护方法的优缺点，最后对检测的评估方法进行了介绍并同时给出了主动式孤 岛检测 AFD 的仿真。 关键词：能源 分布式发电系统 孤岛效应 主动式 II ABST
3、RACT Growing with the development of the society, population, resource utilization, then also appeared many undesirable phenomenon, cause the fossil energy crisis, and will be increasingly serious harm the natural environment, the energy crisis caused many profound influence to the consumers and soc
4、iety. So more and more new energy and renewable development began to appear constantly, and the use of technology, solar energy, wind energy and other clean and huge stock of renewable energy in the human vision. Electricity shortage has been a very serious problem, photovoltaic (pv) grid generation
5、 is expected to alleviate the tense situation in the future, based on the interconnection of distributed power generation technology will be an important direction of the electric power industry development. But when more and more of the photovoltaic power generation system and connected to the powe
6、r grid, when the grid broken network, due to failures or other problems will be easy to generate island phenomenon. Once the islanding in distributed generation systems, will cause harm to maintenance personnel, at the same time will affect the stable operation of the system. So the research of how to quickly detect islanding grid system is and relative to its response has the very vital significance. Firstly the distributed generation system were described in det
