Research On Energy Management Of Integrated Energy System Based On Blockchain

An integrated energy system(IES)is a physical carrier that integrates multiple heterogeneous energy subsystems and provides diversified energy services,which is of great significance to realizing energy cascade utilization,promoting renewable energy consumption and reduce pollutant emissions.Blockchain technology with decentralized and distributed decision-making characteristics can support the energy management of IESs.This dissertation introduces blockchain technology to study the energy management of IESs,reconstructs the consensus mechanism and data communication mode of energy blockchain,and proposes a distributed energy management model based on blockchain,which is applied to multi-energy interaction and energy-traffic coupling scenarios.The main research work is as follows:(1)Based on the operation contribution and energy interaction behavior of each node in the IES,a consensus mechanism to reduce the delay of the energy blockchain network is proposed by dynamically selecting some consensus nodes with high energy contribution value.Firstly,the energy interaction behaviors of energy nodes,such as credible transactions,emission reduction and energy demand response,are characterized as energy contribution values.Combined with the operation contribution of nodes,a blockchain consensus mechanism based on energy contribution proof is proposed.This mechanism can improve the data interaction efficiency of the IES by dynamically selecting a small number of consensus nodes that exceed the energy contribution threshold to verify and transmit energy data.Secondly,the consensus mechanism is used to simulate the Brooklyn energy blockchain project in New York.The results show that the number of system summary nodes has little effect on network delay,and the increase of consensus nodes and information contained in new blocks will reduce the efficiency of system operation.Meanwhile,it is proved that the proposed consensus mechanism can reduce the network delay to less than 2000 ms,which is more than twice the efficiency of the energy blockchain system under the PoS consensus mechanism of Ethereum.(2)A P2P energy management model with high credit is constructed by applying ring mapping identity authentication and credit incentive to the cross-system interaction mode of energy data.On the one hand,the blockchain cross-chain interoperability technology is introduced into the IES for energy management,and the cross-system communication mode of energy data is formed.The ring mapping identity authentication is introduced into the cross-system communication mode to shield the interference of untrusted nodes,and an energy management model with high credibility is constructed based on the dynamic bidding strategy and credit behavior incentive.On the other hand,the model inversion process of the blockchain SM2 encryption algorithm is optimized to simplify the key management process in a cross-system communication mode.Then,the energy management model is applied to China Erlianhaote distributed power market,the model shows the advantages of shielding malicious nodes and effective supervision in data communication;compared with the rigid bidding strategy,the proposed dynamic bidding strategy increases the renewable energy consumption by about 12%in the distributed power market and realizes the positive economic incentive of high credit nodes.(3)To realize the effective interaction of electricity,heat and cold energy,a real-time adaptive energy management system based on blockchain technology is constructed by adopting the bidding strategy of reserve price adjustment and environmental benefit compensation.Firstly,in the continuous two-way auction transactions of multiple energy sources,bidding and reservation prices are adjusted according to the real-time information of the IES.The blockchain distributed data structure is used to update and transmit the information of the energy system in real-time,and then the real-time energy management system is constructed.Meanwhile,the energy management system can quantify the pollutant emissions generated by fossil energy and the environmental governance cost of the region,realize the dynamic compensation of environmental benefits of energy suppliers,and improve the transaction rate of renewable energy.The simulation results show that in the scenario of grid-connected IES,the developed energy management system based on blockchain technology can improve the energy utilization efficiency of IES by using the dynamic adjustment strategy of the reserve price,which increases social welfare and market efficiency by more than 12%.In addition,the environmental benefit compensation mechanism in the energy management system increases the local consumption rate of renewable energy by 50.2%and reduces pollutant emissions such as CO2,SO2 and NOx by 18%.(4)The energy management method studied is extended to the transportation system with hydrogen energy as the hub,and the electricity-hydrogen bidirectional dynamic energy management system is established by characterizing the trading strategy of electricity and hydrogen energy with multiple propensity factors.Firstly,given the application scenario of the energy and transportation coupling system,various trading strategies in renewable energy power bidding,ordinary power users bidding,hydrogenation station power bidding and hydrogen energy pricing are characterized as multiple propensity factors,and the trading method of dynamically adjusting power bidding and hydrogen energy pricing is obtained.Secondly,in the IES centered on the hydrogenation station,the proposed trading method is embedded into the dual-chain blockchain system,and an electric-hydrogen dynamic energy management system that can manage power and hydrogen energy bidirectionally is formed.Then,taking the hydrogenation station with a high proportion of renewable energy as an example,the blockchain application program is developed and deployed.The simulation results show that the trading method of the electric-hydrogen dynamic energy management system improves the consumption of renewable energy by more than 15%,and the daily trading income of the hydrogenation station increases by about 12.98%.This shows that the technical advantages of the electric-hydrogen bidirectional dynamic energy management system based on the multiple propensity factors to characterize the energy trading strategy can significantly improve the energy utilization efficiency of the energy and transportation coupling system.