一种基于等效模型电网动态过程状态估计方法  

State estimation of dynamic process based on equivalent model

作　　者：赵亮[1,2] 钱玉春[2] 顾全[3] 陈根军[3] 

机构地区：[1]华北电力大学,河北保定071003 [2]唐山供电公司,河北唐山063000 [3]南京南瑞继保电气有限公司,江苏南京211100

出　　处：《电力系统保护与控制》2010年第11期10-14,共5页Power System Protection and Control

摘　　要：提出了一种电网动态过程状态估计算法,利用快速、带时标的PMU量测估计电网扰动后的动态过程。该算法以扰动前的静态状态估计结果作为初始断面,对PMU量测不可观测区域的电网模型进行等效处理,在有限的PMU量测条件下可获得电网扰动后动态过程中的连续断面。动态过程状态估计的信息矩阵一次形成后保持恒定,可对连续的PMU量测断面进行计算,满足电网动态过程实时监视和控制的需要。对七节点系统支路故障后的扰动过程进行动态状态估计,验证了所提算法的可行性。This paper proposes a new algorithm of state estimation to get the dynamic process of power grid after disturbance using fast,time-scale PMU measurements.The algorithm uses the results of traditional state estimation before disturbance as the initial state.The unobservable network for PMU measurements is equivalent.Once PMU measurements for generators are obtained,the varied dynamic process of power grid can be estimated.In the algorithm,the gain matrix is kept constant and factorized only once,which is favorable for dispatchers to monitor dynamic process of disturbed power systems.The proposed algorithm has been tested on a 7-bus system with a branch fault and the feasibility of the algorithm is demonstrated.

关 键 词：相量测量单元 动态状态估计 动态过程估计 等效模型 扰动 

分 类 号：TM712[电气工程—电力系统及自动化]