不同线路模型下的配电网三相状态估计  

Estimation on Three-phase State of Distributed Network Based on Different Line Models

作　　者：张磊 郭艳东[2] 陈方明[3] 

机构地区：[1]国网河北省电力公司邢台供电公司,河北邢台054000 [2]国网浙江省电力公司培训中心湖州分中心,浙江湖州313000 [3]国网浙江省电力公司富阳供电局,浙江富阳311400

出　　处：《广东电力》2014年第4期95-98,共4页Guangdong Electric Power

摘　　要：将配电线路分为架空线路和电缆线路两大类,并建立精确、简化和近似3种线路模型。给出负荷不平衡线路伏安特性的计算方法,通过分析线路模型对电压不平衡度的影响,进而研究线路模型对配电网状态估计的影响。通过IEEE33节点系统对不同线路模型进行测试,得出结论:精确模型对实时量测的影响较小,对精度不高的伪量测影响较大;若要提高伪量测的精度,可采用简化模型。This paper divides power distribution lines into two classifications including overhead lines and cable lines and establishes three line models including precise line model,simplified line model and approximate line model.It provides calculation method for V-I characteristics of load unbalanced lines and studies impact on state estimation on distributed network of line modes by analyzing impact of line models on voltage unbalanced degree.Based on IEEE 33 node system,it proceeds testing for different line models and draws conclusions that the precise model has smaller impact on real-time metering while it may has more impact on false metering with low precision.In addition,it suggests to use simplified model to improve precision of false metering.

关 键 词：配电系统 线路模型 状态估计 电压不平衡度 

分 类 号：TM744[电气工程—电力系统及自动化]