微电网无通道保护研究

Research on non-communication protection of Microgrid

介绍了微电网的定义及结构,对微电网的继电保护要求进行分析,分析了微电网中过电流保护及差动电流保护的缺点.引入了简单实用的无通道保护方案,分析了无通道保护的配置原则和工作过程.给出了无通道保护能够实现快速切除处保护区故障的保护动作判据和应用实例.分析结果表明,所提出的保护具有速动性、经济性、自适应性等特点,适用于线路发生各种不对称故障或对称故障的场合.

This paper introduces the definition and the structure of Microgrid,analyzed the relay protection requirements of Microgrid,analyzes the faults of over-current protection and pilot protection that used in Microgrid,and then introduced a simple and practical protection scheme which is called non-communication protection.The protection principle and working process of non-communication are analyzed.The action criterion and the application example of the protection is presented in this paper,the faults are rapidly cleared in protection area.The analysis results show that the proposed protection has characteristics of speed,economy,adaptability,and it can be applied to Microgrid when all sorts of asymmetric fault or the symmetrical fault happened.