Application of State Estimation in Intelligent Substations

doi:10.11985/2017.10.005

Abstract

Abstract:

The estimation speed and accuracy of state estimation in the power dispatching center has become the bottleneck that hinders the achievement of the whole advanced applications infrastructure. So it is significant to study the state estimation in substations. As the significant foundation and node support of the strong smart grid, the intelligent substation has abundant and multi-dimensional information, which provides technology platform for implementing substation-level state estimation. The calculation pressure can be relieved and the data relia-bility of distribution system can be guaranteed through coordination of state estimators in the distributed intelligent substations and the power dispatching center. The implementation scheme and key technology of intelligent substation state estimation is elaborated based on quadratic-constant in the paper, and its application is introduced in an intelligent substation in Binhai of Tianjin. The application results show good performance of the intelligent state estimation, which has great practical value.

Key words: Intelligent substation, state estimation, bad data identification, non-quadratic estimation

CLC Number:

TM464
V44

Yang Zhou,Gong Jun,Che Wenbin,Liu Shisong,Zhang Hongda,Li Ximeng. Application of State Estimation in Intelligent Substations[J]. Journal of Electrical Engineering, 2017, 12(10): 31-36.

Figures/Tables 10

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方案	平均绝对误差/百分比
方案	负荷伪量测 /kW或kvar(%)	支路功率量测 /kW或kvar(%)	电流幅值量测 /A(%)
WLS估计	16.715/15.12	10.079/1.11	1.411/1.07
QC估计	16.670/15.04	3.470/0.37	0.427/0.31

方案	时间/s
方案	图模上传时间	状态估计时间	可视化建模时间	总时间
本文方法	1.3	0.008	0.013	1.321
传统方法	0	68	93	161