微电网智能保护的分区方法  

Region division strategy of micro-grid intelligent protection

作　　者：张宗包[1] 袁荣湘[1] 杨娟[1] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072

出　　处：《电力自动化设备》2011年第6期55-59,共5页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(50677046)~~

摘　　要：提出一种微电网智能保护的新方法。首先建立微电网结构的二叉树,并形成故障决策树。外部电网与微电网的公共连接点(PCC)监测到外部电网发生故障,微电网主动解列运行。对进入孤网运行的微电网,引入功率平衡度的概念,通过对微电网内部各级节点的功率平衡度进行搜索,并根据采集的信息得到微电网分区的可行解,以实现对孤网运行的微电网进行区域划分和保护。相比于传统的被动解列策略,该主动保护策略能保证形成的孤岛不出现较大的功率不平衡问题,实现孤网稳定运行。用PSCAD软件仿真分析,取得良好的效果。A new micro-grid intelligent protection strategy is presented.A binary tree of micro-grid is set up and a fault decision tree is formed.When a fault of utility power grid is detected at PCC（Pointof Common Coupling）,the micro-grid operates automatically in grid-island mode,for which,the concept of power balance degree is introduced.Together with the online information,the feasible strategy to realizethe region division and protection of grid-island is set by searching the power balance degree of decision tree.Compared with the passive splitting strategy,the proposed strategy avoids large powerimbalance and realizes the stable running of grid-island.Simulative results with PSCAD show its advantages.

关 键 词：微电网 电力系统保护 智能保护 决策树 功率平衡度 区域划分 

分 类 号：TM711.1[电气工程—电力系统及自动化] TM773.9