基于改进IGGⅢ和快速分解法的电力系统状态估计算法  

State estimation algorithm based on the improved method of IGGIII and fast decoupled arithmetic

作　　者：王冰[1] 李积捷[1] 王春瑛[2] 刘涛[3] 王野藤 

机构地区：[1]东北电力大学,吉林吉林132012 [2]吉林油田电厂,吉林吉林138000 [3]齐齐哈尔电业局,黑龙江齐齐哈尔161000

出　　处：《继电器》2008年第11期1-4,41,共5页Relay

摘　　要：快速分解算法具有很好的收敛特性,既能处理支路上的量测量,又能处理节点注入型量测量,计算速度快而又节省内存,是工程上一种公认的状态估计的优良实用算法,但它无法处理实际运行的电网自动化系统中存在的少量粗差,从而使状态估计的结果严重偏离真值。通过分析比较几种典型的抗差估计方法,将基于IGGIII法的抗差估计方法与快速分解算法相结合,用于抗拒少量粗差对估计值的影响。由于考虑到在粗差较大时,利用具有淘汰区的IGGIII进行抗差估计可能会出现秩亏,信息矩阵出现奇异现象,系统不可观,导致状态估计不能进行,故该文对IGGIII法中的常数选取进行改进。算例结果表明,该改进算法具有良好的抗粗差能力和可靠的收敛性,收敛速度快,并能够将抗粗差和状态估计在计算过程中能同时顺利完成,不需要进行多次状态估计计算。The fast decoupled arithmetic has a fast calculation speed and a economical memory. It can handle the measurements of the node and branch and is a good and practical arithmetic of state estimation. But it＇s not efficient in handling gross error which will result in a great deviation from the true value. According to analyze a few typical methods in robust estimation, this paper uses a way which is combined by the robust estimation method of IGGIII and the fast decoupled arithmetic to resist the influence of little outlier resistance to estimation. When the gross errors are too bigger and if the common method of IGGIII is used to estimate, the rank-defect and the singular phenomena of coefficient matrix which may make the estimation stop may occur, so the selection of IGGIII constant is improved in this paper. The results of calculation example show that this method has strong robustness, high convergence speed as well as favorable veracity and numerical stability. The outlier resistance and state estimation can be completed in one calculation process.

关 键 词：电力系统 状态估计 IGGIII法 快速分解算法 

分 类 号：TM744[电气工程—电力系统及自动化]