微电网保护策略综述

The Overview of Protection Schemes for Microgrid

近年来为提高电能质量和供电可靠性,越来越多的微电网接入配电网。微电网由分布式电源、储能装置和可控负荷组成。微电网的引入带来的一个主要挑战是设计在并网和孤岛2种运行模式下均能有效保护微电网的保护策略。总结了微电网继电保护面临的难点和特殊需求,介绍了微电网保护的研究现状,探讨了不同方案的优缺点,并给出了未来微电网保护的一些建议。

In recent years, an increasing number of microgrids are connected to the distribution networks so as to enhance power qual- ity and reliability. Microgrid is cluster of distributed generation sources, storage systems and controllable loads. One of the challenges microgrid has brought is to devise a proper protection strategy that is effective in the grid-connected as well as the islanded mode of op- eration. New problems and special requirements faced by microgrid protection are summarized in this paper. Present research situation on microgrid protection is described in which the advantages and disadvantages to each technique are assessed. Some conclusions and suggestions are put forward for the protection of micro-grids in the future.