AN INTERIOR-POINT METHOD FOR NONLINEAR OPTIMAL POWER-FLOW USING VOLTAGE RECTANGULAR COORDINATES

The paper describes the solution of an optimal power flow (OPF) proble m in rectangular form by an interior-point method (IPM) for nonlinear programming. Some OPF variants when formulated in rectangular form hav e quadratic objective and quadratic constraints. Such quadratic featur es allow for ease of matrix setup, and inexpensive incorporation of hi gher-order information in a predictor-corrector procedure that general ly improves IPM. performance. The mathematical development of the IPM in the paper is based on a general nonlinear programming problem. Issu es in implementation to solve the rectangular OPF are discussed. Compu tational tests apply the IPM to both the rectangular and polar OPF ver sions. Test results show that both algorithms perform extremely well.