Application of modified subgradient algorithm based on feasible values to security constrained economic dispatch problem with prohibited operation zones

A security constrained economic dispatch problem with prohibited operation zones for a lossy electric power system is formulated. An iterative solution method that is based on modified subgradient algorithm operating on feasible values is employed to solve it. Bus voltage magnitudes and phase angles, off-nominal tap settings and susceptance values of svar systems are taken as independent (decision) variables in the solution algorithm. Since load flow equations are added into the model as equality constraints, actual power system loss is used in solution of the optimization model. The proposed technique is tested on IEEE 30-bus test systems. The minimum total cost rates and the solution times obtained from F-MSG algorithm and from the other techniques are compared, and the outperformance of the F-MSG algorithm with respect to the other methods in each test system is demonstrated.