Research On Energy Trade Model Of Microgrid Cluster In Active Distribution Network Based On Cooperative Game

To fully increase the efficiency to use distributed energy,reduce the consumption of non-renewable energy and the pollution of the natural environment,the microgrid technology has been rapidly developed in the domain of power system.Microgrids can use all forms of renewable energy locally to maintain the power balance between a local area and the larger grid.With the maturity of microgrid and active distribution network technology,its engineering applications have become very extensive.While,the rapid increase in the number of microgrids also brings new problems,for example,in the aspect of energy trading,based on the consideration of the cost,rationality,fairness and on-site consumption of energy of microgrid trading,the traditional energy trading model between a single microgrid and the distribution network is no longer efficient.Therefore,based on the idea of cooperative game,this paper studies the energy trading model of microgrid cluster in active distribution network,which gives consideration to both efficiency and fairness.Firstly,a cooperative trading model(CT model)based on cooperative game is designed in this paper,aiming at the goal of low cost and high profit in energy trading of microgrid cluster.The model puts forward basic trading rules related to information security,autonomous trading,etc.,as well as related constraints on maintaining the safety and constancy of power delivery,to guarantee the trading mechanism work well in the model.The trading mechanism proposed in the CT model includes the establishment of dynamic electricity prices in coalition trading and the method of arranging the trading volume and objects,and verifying its gaming nature.Simulink was used to simulate the energy supply and demand of each microgrid,a comparison experiment with the traditional trading model was carried out through MATLAB to verify the efficiency of the proposed model.After that,a method of profit distribution was designed for the cooperative profit of the coalition in the CT model to reflect the fairness of the model.Aiming at the potential unfair phenomenon in the CT model trading mechanism,this paper proposes an improved Shapley value method,this method can take into account not only the marginal contribution made by each microgrid in the coalition,but also the production capacity investment cost and energy trading satisfaction of each microgrid.The experimental data verifies the fairness and rationality of this method,and it is suitable for the microgrid energy trading market.Through the mathematical definition,reasoning proof,and simulation experiment of the model,the proposed energy trading model of microgrid cluster in active distribution network can not only reduce the trading cost of each microgrid,but also ensure the fairness of cooperative profit distribution in the model.The data analysis of the experimental results shows that the CT model proposed in this paper is significantly more efficient than the traditional trading model,and can ensure the fairness of all trading participants,so as to maintain the enthusiasm of the microgrid to participate in the trading for a long time,and ensure the stability and sustainability of the trading coalition.