Abstract
This paper presents a decoupled approach for optimal active and reactive power dispatch for the economic operation of an electric utility. The proposed iterative scheme reported in this paper decomposes the optimal load flow problem into a P-subproblem and a Q-subproblem, where the control variables are the active and reactive power outputs of generators. At each iteration the subproblems are solved by quadratic programming using the flexible tolerance optimization method (FTOM). In this approach, constraints are linearized by using sensitivity analysis and the perturbation technique, in order to obtain a wider near-feasible region for this quadratic programming method. This approach has a good computation speed. The results of two test systems and three cases are presented and compared with the results of other methods.
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