| With the rapid development of social economy,the increasing demand for energy leads to the excessive consumption of traditional fossil energy and the continuous deterioration of the global natural environment.In order to solve the problems of energy consumption and environmental pollution,countries around the world are speeding up the development and utilization of distributed renewable energy mainly based on wind power and photovoltaic,reducing the dependence on traditional fossil energy mainly based on coal and oil.Therefore,China has put forward the "30-60" goal,that is,to reach the peak of carbon emissions by 2030,and strive to achieve carbon neutrality by 2060.In order to achieve the "30-60" goal,the development and utilization of distributed renewable energy is the main way,which plays an important role in achieving carbon neutrality in the power field.As the carrier of integrating user side distributed energy,microgrid can realize the effective control and centralized management of various distributed energy.However,with the large-scale development and utilization of distributed energy,great changes have taken place in the power trading mode.The traditional centralized power trading mode can not meet the demand of distributed power trading based on Microgrid,which also has a certain impact on the economic operation of microgrid.Microgrid is a powerful support to realize the market-oriented transaction of distributed generation.The research on the optimal operation of microgrid economy with distributed energy transaction is the focus of promoting the market-oriented transaction of distributed generation at present,and it is also one of the main forms of market-oriented transaction of distributed generation in the future.Firstly,this paper analyzes and summarizes the development status of microgrid and the progress of distributed power trading from three aspects:the development history of microgrid,the optimal operation of microgrid economy and distributed energy trading.By referring to the domestic and foreign distributed energy trading mode,the micro grid distributed power trading process is designed.In terms of price design,based on the real-time power supply and demand status in the microgrid,this paper takes the power purchase and sale price of the main network as the reference,and introduces weight variables α and β to adjust the reference price of distributed transaction,and designs the distributed power transaction pricing model in different scenarios.The results show that the distributed electricity transaction price obtained by this method can reduce the energy consumption cost of microgrid users,improve the economic benefits of microgrid users,and promote microgrid users to participate in distributed transaction.Secondly,this paper analyzes the characteristics of different types of microgrid system in detail from the two aspects of microgrid system structure and load.By comparing the characteristics of different types of microgrid,combined with the characteristics of distributed power transaction and application scenarios,this paper selects the residential optical storage community microgrid as the research object,and builds the residential optical storage community microgrid system architecture including four types of users;On this basis,the mathematical model of distributed photovoltaic and energy storage equipment is constructed,which provides a theoretical basis for the follow-up research.Finally,starting from different types of users in the microgrid,this paper uses the mixed integer programming method based on yalmip to build an optimization model with the objective function of the lowest energy cost,the operation constraints of each power supply equipment and the microgrid power balance as constraints,The operation of four types of users in the microgrid in the case of distributed power trading and the cooperative operation of multiple types of users are analyzed respectively.The results show that the energy consumption cost of different types of users can not only effectively reduce,but also improve the economic benefits of distributed energy owners.This study can provide theoretical reference and practical basis for users to invest in the construction of distributed energy and participate in distributed power trading. |
