Coordinated Optimization Of Electricity Transaction Among Isolated Interconnected Microgrids

The intermittent nature of renewable energy output power,the randomness of flexible load power fluctuation and the diversity of load types cause problems easily such as the mismatches between electricity supply and demand within microgrids.Abandoning or overloading is harmful to the stability and economic operation of microgrids directly.With the gradual deregulation of electricity markets,the full use of the spatial-temporal complementarity of different distributed energy sources in interconnected microgrids will provide a solution for the realization of electricity transactions which share electricity.In consideration of individual interests,microgrids give preference to achieving local electricity balance and lack of motivation to participate in electricity transactions,which poses a huge challenge to maintaining electricity markets.At the same time,the high penetration of supply sides and the active participation of demand sides have made electricity transactions more complex.In view of the above problems,this paper studies the coordinated optimization of electricity transactions among isolated interconnected microgrids from the perspective of electricity transaction brokers:this paper studies fair and reasonable incentive mechanisms for electricity transactions among isolated interconnected microgrids to increase the enthusiasm of individual microgrids for participating in electricity transactions;this paper studies the coordination among individual microgrids which have different forms and various interest demands involved in electricity transactions so as to achieve the system electricity sharing with optimal economy and stability.The electricity requests and allocations under the non-pricing incentive mechanism are respectively described as a non-cooperative electricity competition game and a water-filling problem.Besides,the coordination of electricity transactions under the pricing incentive mechanism is described as a Markov decision process.The specific research tasks of this paper are as follows:Taking isolated interconnected microgrids in the real-time electricity market as the research object,the component models of microgrids and the optimization model of electricity transactions which takes electricity transmission losses into account are firstly given.Then,the constraints of the original optimization model are included as risk penalties in the system objective,and the problem is equivalently transformed into a Markov decision process.A new coordinated optimization method of electricity transactions based on Deep Deterministic Policy Gradient under dynamic prices is presented,which is used to make decisions on optimal electricity transactions and optimal charge and discharge power of batteries among isolated interconnected microgrids.Simulation analysis validates the effectiveness of the coordinated optimization method.Finally,combining the subjective willingness of electricity supply and demand with the objective actuality of electricity supply and demand of both parties,A fresh kind of electricity transaction coordinated optimization scheme for electricity request and allocation based on the priority of individual microgrids is proposed.Also,a non-cooperative game and a distributed water-filling algorithm are combined to provide a coordinated optimization method of electricity transactions.Simulation analysis validates the effectiveness of the electricity transaction coordinated optimization scheme.