Bi-level Optimal Scheduling Strategy for Electric Vehicles with Small-Signal Stability Constraints

Abstract

To reduce the regulation pressure of generator with small-signal disturbance, a bi-level optimal scheduling strategy for electric vehicles (EVs) with small-signal stability constraints is proposed. The upper optimization model aims at minimizing the active power regulation of the generators and optimizes the scheduling plans of EVs agents by optimal power flow. The lower optimization model takes the charging demand of EVs users as the goal, optimizes the charge/discharge power of EVs under the constraints of the upper scheduling plans. The proposed strategy can improve the small-signal stability of power grid. Meanwhile, it reduces the regulation of the generator and ensures the charging demand of EVs users. The numerical simulation is carried out on an improved IEEE-14 bus system, the test results verify the effectiveness of the strategy.