考虑分区的电网参数辨识与估计方法  

An Identification and Estimation Method of Network Parameter Errors Considering Division

作　　者：张良[1] 贾晋峰[2] 宋莉[3] 宋林滔[4] 

机构地区：[1]青海省电力公司三新农电有限责任公司,青海西宁810000 [2]重庆市电力公司杨家坪供电局,重庆400050 [3]西安供电局．陕西西安710032 [4]长沙电业局,湖南长沙410000

出　　处：《陕西电力》2011年第10期27-31,共5页Shanxi Electric Power

摘　　要：多个不良数据(遥测坏数据和参数错误)存在时,现有参数辨识与估计方法很难保证其结果的有效性。为此,文中提出了考虑分区的电网参数辨识与估计方法。首先,基于最小度拓扑搜索,将原网络分解为辐射子网、简单环网和复杂环网,形成多个独立子区域;其次,对每个独立子分区,采用拉格朗日辨识法辨识不良数据;最后,对每个可疑参数进行考虑零注入功率约束的加权最小二乘增广估计。该方法避免了不同子区域之间不良数据的相互影响,提高了多个不良数据辨识的有效性与错误参数估计的精度。基于IEEE30节点系统的算例计算,验证了该方法的有效性。Existing methods can not effectively identify and estimate multiple erroneous parameters along with bad telemetry measurements, which is referred to as had data for short. To solve this problem, an identification and estimation method of network parameter errors based on division is presented. Firstly, the network is divided into radial network, simple meshed network and complex meshed network to form many independent subareas. Secondly, Lagrange identification approach is carried out to identify bad data in each subarea. Lastly, if a parameter is identified as suspicious parameters, a function weighted least squares （ FWLS ） augmented method is proposed to estimate its value considering electrical power is zero. The interaction of bad data between different subareas is avoided. Thus, the effect of bad data during parameter estimation is inhibited by this method and the accuracy of estimating erroneous parameter is improved. The validity of the proposed method is verified by simulations on the IEEE 30 bus system.

关 键 词：拓扑分区 参数辨识 参数估计 拉格朗日辨识法 

分 类 号：TM744[电气工程—电力系统及自动化]