A Bidding Method For Local Market Of Microgrids With Multiple Prosumers

With the continuous development and application of distributed power generation technology,prosumer users with considerable power generation capacity have begun to appear in large numbers on the receiving side of the power system.A micro-grid system consisting of prosumers whose role are variable has a complex demand response characteristic.The top-down demand response mechanism based on grid price is no longer applicable to such microgrid users.With the gradual liberalization of the power distribution side power market,the microgrid can be controlled and managed by introducing a local market.Therefore,it is very necessary to study the bidding transaction method in the micro-network local market.Based on such consideration,this paper proposes a bidding trading system for the microgrid market-operator-power spot market,and models each subject to simulate the operation of this system.Firstly,the topology between the main bodies of the microgrid is described,and the information exchange based on the Energy Management System(EMS)is given.The basic flow of a single operation cycle is set.Then,the resources and basic appeals of each subject in the micro-network are analyzed,and the basic models of micro-network users and operators are established.For the prosumers in the microgrid,the load is divided into fixed load and shiftable load.The electric supply is divided into intermittent power supply and controllable power supply.For the microgrid operators,the basic models of the microgrid market,the power spot market and the energy storage device were established,and their trading patterns and profit methods in the microgrid market and the power spot market were analyzed.Based on the basic model of revenue maximization,the power price setting strategy is analyzed,and its real-time optimal scheduling model is given,and the dynamic programming algorithm is used to solve it.Finally,the model of this paper is simulated by the example of the microgrid system composed of operators and six PV producers,which verifies the effectiveness of the bidding method.It also analyzes the effects of operating in this mode on the microgrid and the external grid.