New Loss Formulae For Real And Reactive Power Optimization

Two general loss formulations have been proposed in this paper for total system real power loss and series reactive power loss and series reactive power loss. These are expressed as quadratic functions of both real power and pv-bus voltages. Quadratic expression for series reactive power loss has also been proposed only in terms of reactive power control variables, i.e., pv-bus voltages, shunt reactive power compensation and OLTC. Moreover, closed form expressions have been derived for these coefficients as well as A-loss coefficients, utilising sensitivity coefficients and partial derivatives of real and active power losses with respect to optimization variables. Hence, updating of loss coefficients is quite efficient. Because of closed form expressions, solution of linear set of equations is eIiminated.