Title :
An improved state estimator in distribution systems
Author_Institution :
Coll. of Autom., Beijing Inf. Sci. & Technol. Univ., Beijing, China
Abstract :
An improved state estimation algorithm based on branch current is put forward to revise leverage-point measurements with gross errors in distribution systems. Using the inherent characteristic of leverage-point measurement, this method introduces structure robust factors into the objective function of the weighted least absolute value (WLAV) estimator for weakening the masking effect of bad leverage-point measurements. Meanwhile, a new approach is proposed to deal with voltage-magnitude measurements on the branch-current-based state estimation so that it can increase the measurement redundancy and the estimation precision, and enhance the observability. An analysis is done for the IEEE 123-bus systems and the tested results show the advantages of each one of new ideas.
Keywords :
distribution networks; observability; power system measurement; state estimation; voltage measurement; IEEE 123-bus system; branch-current-based state estimation; leverage-point measurement; observability; power distribution system; state estimation algorithm; voltage-magnitude measurement; weighted least absolute value estimation; Current measurement; Measurement uncertainty; Power systems; Robustness; State estimation; Voltage measurement; Weight measurement; leverage-point measurement; measurement transformation; state estimation;
Conference_Titel :
Computer Science and Automation Engineering (CSAE), 2011 IEEE International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-8727-1
DOI :
10.1109/CSAE.2011.5952628
