Research On The Optimization Of Self-regulation And Collaborative Energy Management Of Household Micro Grid Group

With the rapid development of science,technology and economy,environmental pollution and resource shortage caused by the continuous consumption of traditional energy are becoming increasingly prominent.The development of clean and renewable energy has brought solutions to this problem.Renewable energy as a large number of distributed power access to the grid brings high penetration problems,smart grid came into being.As an integral part of smart grid,household micro grid realizes the unified control of distributed power supply,power load and energy storage equipment.With more and more household micro grid appearing in distribution system,it is urgent to solve the optimization problem of multi micro grid system.In this paper,the energy management of household micro grid and the energy coordination optimization and benefit distribution of multi micro grid are researched.The main contents of this paper are as follows:Firstly,the mathematical model of each component unit in the household micro grid is established.The distributed generation uses photovoltaic power generation.According to its photovoltaic power generation law and parameters,the photovoltaic output power model is established.According to its working characteristics,the power load is classified into discrete operation and continuous operation,direct energy storage and indirect energy storage,interruptible and non interruptible,translatable and non translatable attributes.For different components,different mathematical models are established according to their working characteristics.Then,the overall framework of household micro grid is introduced,and a day ahead optimization model with the optimal operation cost as the objective function is established.According to the time-sharing electricity price,the working period of each load is scheduled,and the charging and discharging state of energy storage equipment in each period is determined.The simulation analysis gives the results of the day ahead optimization of five people with different living habits.The effectiveness of the optimization method is verified by three different optimization strategies.At the same time,the cost of the electricity transaction between the household micro grid and the large grid is taken as the breakdown point of the negotiation between the micro grid operators in the Nash bargaining model.Finally,a Nash bargaining model based on cooperative game is established for the power transaction between the user micro grid group and the distribution system.In the model,the distribution operators are regarded as the center of cooperative game,and the household micro grid group only cooperates with the distribution operators,and adopts independent clearing price.Nash bargaining model is used to solve the problem of maximum social benefit of the whole distribution system.Using alternating direction multipliers to solve distributed optimization can effectively protect the privacy of participants in cooperative games.The simulation results show that the Nash bargaining model can effectively reduce the operation cost of participants and achieve the optimal social cost of distribution system.