Transmission Line Sequence Impedances Identification Using PMU Measurements  

作　　者：Huafeng Zhou Xuanyu Zhao Di Shi Huashi Zhao Chaoyang Jing 

机构地区：[1]Grid Control Center, China Southern Power Grid, Guangzhou 510000, China [2]Energy Management via Information Technology, Pasadena, CA 91107, USA

出　　处：《Journal of Energy and Power Engineering》2015年第2期214-221,共8页能源与动力工程（美国大卫英文）

摘　　要：An online TL （transmission line） impedance TPIS （transmission line parameter identification system） using PMU （phasor measurement unit） was recently developed and implemented at CSG （china southern power grid company）, Traditional approaches for TL impedance calculation only approximate the effect of conductor sags and ignore the dependence of impedances on temperature variation. Utilizing PMU measurements may improve the accuracy of TL parameters calculation. The challenge is that the parameters identified are very sensitive to noise and errors in PMU measurements, which are difficult to quantify and can be uncertain under different system operating/loading condition, TPIS provides an innovative yet practical problem formulation for TL sequence parameter estimation based on least-squares with linear constraints. A bootstrapping-based resampling technique is developed and a new metric is proposed to determine the credibility of the estimated sequence impedances. This paper discusses the proposed methodologies, challenges, as well as implementation issues identified during the development of TPIS.

关 键 词：Sequence impedance transmission line PMU constrained optimization. 

分 类 号：TM744[电气工程—电力系统及自动化] TM726