A new decoupling strategy for power system state estimation

This paper presents a new decoupling strategy by strengthening P–δ and Q–V relationships based on line flow and voltage magnitude measurements in order to obtain a reliable convergence and higher computational speed. The real and reactive set of measurements are combined using simple multiplying factors such that the modified set is decoupled into two set of equations without making any assumption on r/x ratios. The resulting Jacobian matrices that contain only line parameters are sparse and constant. The technique is applied on three test systems and is solved by WLS and WLAV methods to illustrate its superior performance.