Power System State Estimation Approach Considering Transmission Line Temperature

The transmission line parameters vary with the change of temperature, which has a significant impact on power system state estimation (SE). Based theory electro-thermal coordination (ETC), this paper proposes two ETC-SE approaches consideration temperature. heat balance equation (HBE) is combined conventional weighted least square SE for establishing an model. Moreover, augmented Jacobian approach developed by integrating HBE into pseudo measurements and temperature vectors. matrix correspondingly partial differential coefficients to are provided, enables calculate voltage phasors simultaneously. Furthermore, in order accelerate solving process, improved two-step algorithm proposed, decoupled solved via alternate iteration. effectiveness proposed verified IEEE 14-, 39-, 118-bus systems. results show that effective reduce calculation errors possesses good convergence performance varying environmental circumstances ill-conditioned branches.