计及PMU的混合非线性状态估计新方法  

A New Method for Hybrid Non-linear State Estimation with PMU

作　　者：秦晓辉[1,2] 毕天姝[1,2] 杨奇逊[1,2] 

机构地区：[1]华北电力大学电力系统保护与动态安全监控教育部重点实验室 [2]华北电力大学四方研究所,北京市102206

出　　处：《电力系统自动化》2007年第4期28-32,共5页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50607005);教育部科学技术研究重点项目(106052);新世纪优秀人才支持计划(NCET-05-0216);长江学者和创新团队发展计划(IRT0515)。

摘　　要：提出一种将同步相量测量单元(PMU)的直接电压相量量测变换为间接支路电流量测,并与监控与数据采集(SCADA)量测量一起进行混合迭代的非线性状态估计方法。对构造等效电流修正量而带来的间接量测误差进行了详细和定量的分析,并对该混合估计算法的精度进行了定性分析和定量计算。理论分析和算例表明,该方法可以获得较高的估计精度,在收敛次数和滤波效果上也有所改进。A new method for hybrid non-linear state estimation with phasor measurement unit （PMU） is proposed, in which the direct voltage phasor measurement is transformed into indirect equivalent branch current measurement to conduct the hybrid iteration with SCADA measurement. The indirect measurement errors caused by constructing the equivalent current modification are also analyzed and calculated in detail. The accuracy of the hybrid estimation algorithm is analyzed qualitatively and calculated quantitatively. The theoretic analysis and simulation results demonstrate that the proposed method has higher estimation precision and better performance in convergence time and filtering effect.

关 键 词：相量测量单元 量测变换 混合量测 状态估计 电力系统 

分 类 号：TM732[电气工程—电力系统及自动化]