基于节点搜索的微电网自适应保护方法  

An Adaptive Protection Method for Micro-grid Based on Node Searching

作　　者：贾清泉[1] 孙玲玲[1] 王美娟[1] 杨威[2] 

机构地区：[1]燕山大学电气工程学院,河北省秦皇岛市066004 [2]中国电力科学研究院,北京市海淀区100192

出　　处：《中国电机工程学报》2014年第10期1650-1657,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51177142)~~

摘　　要：由于微电网拓扑结构灵活多变,且并网及孤岛运行时故障特性不同,使得传统的继电保护难以满足要求。针对微电网继电保护的需求特点,提出基于故障电流方向判别的微电网自适应保护方法,将微网实时拓扑结构转化为树形节点路径图,采用树形节点搜索方法及节点路径算法对微网内保护装置的动作值及动作时限进行自适应整定。在此基础上提出基于IEC 61850的微电网自适应保护系统。仿真算例结果证明了所提方法的有效性。该方法能够有效跟踪网络拓扑结构变化而实时更改保护整定值,具有较好的自适应性。The traditional protection schemes are unsuitable for micro-grid due to the variety of micro-grid topology and fault characteristics in islanding and grid-connecting circumstances. In this paper, an adaptive protection scheme based on identifying the direction of fault current was presented. Real-time topology of the micro-grid was expressed with the path graph of the node tree. The node tree searching process and node path identification algorithm were presented. The searching and identifying results were applied to adaptively set the operation values and time limits. An adaptive protection system based on IEC 61850 was proposed. Simulation results verify the validation of the method. By means of the presented scheme, the relay settings can adaptively track the topology changes of micro-grid in real time.

关 键 词：微电网 自适应保护 树形节点路径图 树形节点 搜索 IEC 61850 

分 类 号：TM77[电气工程—电力系统及自动化]