Research On Trading Mechanism Of Distributed Electric Energy In Microgrid

As a relatively independent grid structure,microgrid is the main market for distributed renewable energy trading in the future.Deep penetration of Distributed Generation(DG)in microgrids leads to decentralized power supply.The random access of electric vehicles brings opportunities and challenges to the configuration and optimization of local resources.In this case,the traditional centralized management and sale of electricity are no longer applicable.As a novel and reliable distributed ledger,blockchain can establish a decentralized trading market with open and transparent data,automatic execution of transactions,and reliable information through consensus mechanism,cryptography,Merkel tree,and smart contracts.These provide basic technical support for distributed electrical energy transactions.First,this thesis proposes a 4-layer structure of distributed energy trading system framework based on blockchain technology,and clarifies the function realization of each layer structure in detail.For the proposed trading system,the thesis introduces the composition and operation mechanism of the participants in the trading market,and expounds the specific process of energy trading based on smart contracts.In addition,this thesis proposes an implementation method for safety verification and blocking management that meets physical constraints in electrical energy transactions.Secondly,in order to protect the basic economic interests of producers and realize the optimal allocation of microgrid electricity resources,this thesis proposes a multi-stage hybrid auction mechanism.The hybrid auction mechanism divides the auction into two stages.In the first stage,the continuous double auction mechanism oriented to the overall best meets the electricity demand of regular load users.In the second stage,the optimal continuous one-way auction mechanism for electric vehicles is used to coordinate the electricity consumption behavior of electric vehicles to consume excess capacity of photovoltaic users.Simulation results show that the mechanism is feasible and effective for protecting the interests of users and optimizing the allocation of electrical energy resources.Finally,in order to solve the default scenario that occurs in distributed power trading,this thesis proposes a distributed power trading mechanism based on contract orders.This mechanism replaces the traditional auction mechanism by way of distributed orders,and allows orders to be transferred during the transaction process.In addition,this paper proposes a conflict resolution mechanism based on the maximum objective function and reputation value to solve the problem of order conflicts during user matching.Simulation results show that the transaction mechanism has obvious advantages over the traditional auction mechanism in dealing with default problems and improving transaction efficiency.