Research On Decentralized Coordinated Optimal Dispatching For Interconnected Power Grid With Wind Power Penetration

With the development of modern intelligent power system and the increase of the proportion of renewable energy power access,new management modes of regional multi-energy interconnection such as virtual power plants have begun to receive widespread attention.The virtual power plant aggregates multiple distributed units to interconnect and integrate to realize the intelligent and common management and dispatch of the system.At the same time,the energy system has gradually evolved from a traditional centralized decision-making model to a distributed decision-making model,which will cause the problem of lack of trust in the virtual power plant in the process of scheduling.Furthermore,the characteristics of blockchain technology,such as decentralization,collective maintenance and security sharing,have research significance in the introduction of virtual power plant for intelligent scheduling decision-making.Therefore,the new scheduling mode combined with blockchain technology is an important research direction in the future.This paper establishes a two-stage robust optimization model for virtual power plants based on energy blockchain technology.Taking advantage of the traceability of historical data in blockchain network,a robust uncertain set based on data-driven is constructed to describe the wind power output,and the column and constraint generation algorithm is used to solve the problem.At the same time,the practical Byzantine fault tolerant algorithm consensus mechanism is used to solve the trust problem in the scheduling process.The main research contents and results are as follows:Firstly,the energy blockchain network is constructed and the scheduling and operation mechanism of virtual power plant under the energy blockchain network is established.This paper analyzes the characteristics of the combination of blockchain technology and energy Internet,and analyzes the rationality of introducing energy blockchain technology into virtual power plants.Then,it compares the characteristics of several typical blockchain consensus mechanisms,and develops the scheduling and operation mechanism of virtual power plants under the energy blockchain network.Secondly,the two-stage robust optimal scheduling model of virtual power plant is established.In the first stage of the model,wind power prediction value is selected as the benchmark scenario,and the optimal dispatching model of virtual power plant is established with the objective of the lowest economic operation cost of virtual power plant,and the pre dispatching scheme is formed;in the second stage of the model,the unbalanced power will be generated by considering the deviation between the predicted wind power output and the actual output,and the distributed units aggregated by the virtual power plant will be adjusted and controlled in addition,the same as In order to promote the level of wind power consumption,the cost of wind abandonment penalty is introduced,and finally,the control model is established with the objective of the extra control cost and the minimum penalty cost caused by the uncertainty of wind power output.The simulation results of the scheduling model are given to verify the effectiveness of the method.Finally,a common understanding mechanism of Byzantine fault tolerant algorithm is proposed to realize semi centralized scheduling strategy under block chain.Firstly,the probability distribution of wind power output historical scene is obtained by using the characteristics of traceable historical information in blockchain network.The data driven uncertainty set of wind power output is constructed according to the probability distribution of wind ionization dispersion under the constraint of comprehensive norm.The uncertainty set contains historical information,considers the correlation between random variables,and can effectively reduce the conservatism of decision-making.Meanwhile,the verification function of Byzantine fault-tolerant algorithm in blockchain technology is used in the optimization process,which abandons the information tampered by malicious nodes and enhances the fault tolerance ability of the system.Finally,the effectiveness of the proposed method is verified by an example simulation.