Analysis And Optimal Operation Of Multi-microgrid System Based On Interaction Behavior Modeling And Game Theory

With the rapid development of all kinds of new energy and distributed generation(DG),microgrid technology has received more and more attention in order to give full play to the integrated technical and economic benefits of a variety of distributed energy.Micro-grid technology is more conducive to integrate the advantages of distributed power generation,reduce the burden on the distribution network and optimize the structure of the entire power grid,thus providing a new technical approach for largescale application of distributed power generation.However,microgrids and distribution network belong to different investors and in the optimization of different types of distributed generation and energy storage system,various investors all intend to achieve maximum benefit.At the same time,the microgrid has some autonomy in operation,which can accept the dispatch and control orders from distribution network,and also achieve the best operation strategy in terms of economic benefit and security.With the increasing number of microgrids in the power system,the coordination among decision-making bodies and how to achieve optimized operation of multi-microgrid system become an urgent problem to be solved.Game theory has become one of the main methods to solve the problem of optimization and coordination multiple decision-making bodies.These days,the optimal planning of microgrid mainly focused on a single entity such as microgrid or distribution network and maximize their own interests.The actual situation is that both distribution network and microgrid or even the distributed sources can be game players to achieve the maximization of self-interest by configuration of micro sources.In the optimal operation of multi microgrid system,a non-cooperative game is usually considered,which consider the various players' individual interests and thus effectively simulates the system with multi interest bodies.As a result,this paper researches various game models for multimicrogrid configuration and optimized operation of the system under two different game approach based on multi-agent method,which has important theoretical and practical significance.The main research results are as follows:(1)The direct interaction optimization model of multi-micro-net is proposed.The multi-micro-grid dispatching center can directly optimize various micro-sources and dispatchable power supplies in each micro-grid.Under the premise of full consideration of various costs,the optimal power exchange strategy is chosen according to the residual power and position of the microgrids to satisfy the power demand of the microgrids with power shortage and to minimize the cost of the micro-grid system.(2)A cooperative game optimization model is proposed.Microgrids form the optimal coalition structure for power interaction according to their current power conditions and positions,so as to reduce the cost of power purchase from the distribution network,thus minimizing the cost and rational distribution of the interests of the members.(3)Based on the multi-agent framework,a non-cooperative transaction model multi-microgrid system is established.The corresponding utility function is established by considering the different kinds of internal loads of each microgrid.At the same time,the pricing mechanism is established,which effectively simulates the characteristics of the power market.Finally,the optimal power supply strategy and power trading strategy for each micro-grid are proposed by combining the firefly algorithm.