A Reactive Optimization Model with Flexible Objectives for Power Systems Containing Infeasible Voltage-Violated Buses

The paper proposes a reactive optimization model with flexible objectives for power systems containing voltage-violated buses. For this infeasibility problem, concepts of weak substations and non-weak area are proposed, and the reactive optimization model with flexible objectives is established. This model was composed of the controlled voltage sub-model for weak substations and the reactive optimization sub-model for non-weak area. The objectives were the minimum deviation voltage for infeasible voltage-violated buses and the minimum real power loss respectively. The set of constraints are based on the conventional reactive optimization constraints for the feasible voltage buses, and the dynamically updating voltage security boundary for infeasible voltage-violated buses. And considering these two objectives are interactive and successive, this paper correspondingly proposes a strategy of chronological population-reproducing successively for solving this proposed two sub-models in the hybrid parallel cooperative co-evolutionary algorithm (HPCCEA). This hybrid algorithm contains evolution algorithm (EA) and interior point method (IPM). Finally, a 63-bus power system is used for simulating and verifying that the proposed method is effective.