Cooperative game consistency optimal strategy of multi-microgrid system considering flexible load

Abstract

ABSTRACT In this paper, a cooperative game consistency optimal scheduling strategy for islanded multi-microgrid systems is proposed to solve the problem of energy mutualization and economic scheduling. Firstly, considering the power loss, flexible load demand, and other operating indicators, to maximize the user and supplier benefits, the real-time transaction electricity price model of the user side and the power supply side is constructed. On this basis, considering the energy sharing among microgrids and aiming at minimizing the operating cost of the multi-microgrid system, a multi-microgrid cooperative game optimization scheduling model is established. Then, the optimal solution of the cooperative game model is obtained by using the consensus algorithm of equal increment rate. The equivalence between the real-time transaction price of the user side and the power supply side and the transaction price on the microgrid is proven. The Shapley value method is used to complete the benefit distribution of each microgrid. Finally, the validity and reliability of the method are verified by an islanded multi-microgrid system. Simulation results show that when multiple microgrids are involved in a cooperative game, by optimizing the transaction electricity price among microgrids and the output of controllable distributed units, regulating and flexible load demand, energy sharing among microgrids can be achieved, and the overall operating costs of the alliance can be reduced. The total daily scheduling cost of cooperative game alliance is 1749 USD less than that of independent operation mode. Solving the cooperative game model by using an equal increment rate consensus algorithm allows the optimal global solutions to be obtained quickly, and the solution time is only 0.6 s, and effectively suppresses the negative effects of fluctuating or uncertain factors on the multi-microgrid system.