微电网保护研究综述

A review of the research on microgrid protection development

微电网的保护是微电网大规模发展过程中需要解决的关键问题之一。由于微电网存在孤岛运行模式以及分布式电源的大量接入,导致其故障电流的特征不明显,使得配电网中传统的保护策略存在拒动或者误动的情况,国内外研究人员针对此问题展开广泛研究。总结并分析了近年来微电网保护领域内的研究成果,首先梳理出微电网保护需要克服的难点和关键技术,然后将相关文献中采用的微电网保护方法分成七类,分别归纳了差动保护、过流保护、距离保护、自适应保护、基于电压量的保护、基于智能算法的保护以及故障电流补偿方法的技术特点和适用性。最后,在结论部分给出了微电网保护技术的主要特点和未来发展趋势,为其后续研究和应用提供参考。

Microgrid protection is one of the crucial problems to be solved during the rapid development of microgrid. Since microgrid has many distributed generations connected and is capable of operating in both grid-connected and islanded mode, no obvious features of its fault current can be observed which makes the traditional protection strategy in distributed grid refuse or mistake to respond to the fault. Researchers around the globe have engaged wide studies on this subject. This paper summaries and analyzes various study results in the microgrid protection area. Firstly, the technical challenges in microgrid protection are summed up. And then the existing protection techniques on microgrid are sorted into seven categories, which are differential protection, overcurrent protection, adaptive protection, voltage based protection, intelligent algorithm based protection and fault current compensation method. The benefits and drawbacks of each techniques are presented and discussed. Finally, the possible future trends of microgrid protection are concluded which would provide reference to the following studies in this field.