摘要
为了克服双向潮流以及并网、独立运行差异较大的短路电流给微网保护带来的困难,研究了交流微网的相间短路保护问题。针对微网结构特点,提出了微网的分割区域(partition area,PA)概念,建立了微网的图模型。为了追求微网保护的普遍适用性,根据微网运行特点,约定了微网保护设计的几个前提。通过比较PA综合电流在故障前后的变化,得到了微网PA故障特征。由于得到PA综合电流需要数据同步且其方向不可获取,进而提出了边方向变化量保护原理。基于微网图模型建立了边方向变化量保护算法,分析了边方向变化量保护的实现。最后通过PSCAD/EMTDC仿真验证了边方向变化量保护算法的有效性。
The bi-directional power flow in microgrid and the significant difference in short circuit current under grid-connected and grid-disconnected circumstances are two main problems facing by microgrid protection. In order to overcome these difficulties, the phase to phase short circuit problems of AC microgrid were researched. According to microgrid structures, a concept called partition area （PA） of microgrid was proposed, and the graph model of microgrid was established. In order to pursue general applicability of a microgrid protection scheme, several premises of microgrid protection design were arranged according to the operation characteristic of microgrid. The fault features of PA are gained through comparing the integrated current of PA after a fault with that before the fault. Because getting integrated currents of PA needs data synchronization and the directions of integrated currents can not be obtained, the principle of branch directional variation protection （BDVP） was proposed. The algorithm of BDVP was established and the implementation of BDVP was analyzed. At last, the validity of BDVP was verified through PSCAD/EMTDC simulation.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2012年第25期158-166,22,共9页
Proceedings of the CSEE
基金
国家高技术研究发展计划(863计划)(2011AA05A107)
国家自然科学资金(50807008
51177015)
江苏省产学研前瞻性联合研究项目(BY2010142)
国家电网公司科技项目(SG1018)~~
关键词
微网
继电保护
拓扑图
分布式发电
变化量
microgrid
relay protection
topology graph
distributed generation （DG）
variation
