A solution to security constrained non-convex economic dispatch problem by modified subgradient algorithm based on feasible values

► Although the proposed method is a deterministic one, it can solve the non-convex dispatch problems. ► The solution time of the proposed method is highly lower than that of the evolutionary methods. ► Complex bus voltages, tap ratios, susceptances of svar systems are taken as independent variables. ► The proposed solution algorithm can solve the problems with high dimension.