Research On Photovoltaic Microgrid Trading System Based On Blockchain Technology

Due to the depletion of fossil energy and environmental pollution,clean and renewable distributed new energy power generation has gradually become the focus of attention.However,the new generation of power generation is unstable.When connected with grid,there is a big impact on the power grid.People are looking for a new way of distributed new energy generation to participate in the electricity market.Under the background of hot development of new things such as Bitcoin and Ethereum in the past few years,its underlying technology,blockchain technology,has been gradually paid attention to.As a decentralized distributed shared database,blockchain technology can achieve centralization of point to point transactions,which is a hot topic in academic and emerging business models.Blockchain technology is mainly applied in the financial field at present.Its characteristics of trust and non-tampering make it widely used in digital currency,transaction payment,distributed account keeping and stock raising.The emerging business mode brought by blockchain provides a reference for other industries in the future.In this field of energy,the concept of energy blockchain is put forward.The energy blockchain contains extensive application scenarios: from large scale,energy block chain can play a role in different aspects such as metrology certification mode,market organization,energy finance and other entities in the energy Internet,such as power supply,power grid and load.;from the scope of view,the energy blockchain technology can change the way people trading power,for example users in microgrid can trade electricity through point to point transactions.However,there is not a complete system using blockchain technology to trade electricity at present,it is of great significance to study the mode of electricity transaction based on blockchain.On the basis of introducing the electric power market into the micro grid,this paper puts forward the application of block chain technology to the photovoltaic micro grid power transaction.Then the physical basic requirements for the application of blockchain technology to the PV microgrid power transaction are discussed.The necessity of the two-way electric meter and the user energy management system under this background is pointed out.The bidirectional meter provides a way of measuring separately for the two behaviors of the user to sell electricity and buy electricity.The energy management system provides guidance for users' using electricity and predicts the output power of PV.Then this paper sets up a user's mathematical model of using electricity.According to the user's buying and selling behavior,the users in the microgrid are divided into the power purchase user group and the sale user group.The purposes of its participation in the power sharing of microgrid are separately to reduce the cost of electricity purchase and to increase the efficiency of electricity use,and the corresponding mathematical model is established.Then the establishment of a non-cooperative and incomplete information static game model in the pursuit of their own purpose is established by the establishment of electricity selling and purchasing users.The equilibrium point of the game is proved,and the equilibrium point is the optimal solution of the game model.Finally,the photovoltaic microgrid data verify that the transaction model can effectively reduce the cost of purchasing electricity and increase the user benefit,while reducing the interaction power between microgrid and large power grid,reducing the impact of microgrid on the large power grid.