Research On Distributed Economic Dispatch Scheme Of Microgrid Under Cyber-Attacks

Aiming at the microgrid economic dispatch,compared with the traditional centralized dispatch mode,the distributed dispatch mode can save communication resources and is easy to implement the "plug and play" of the unit.The existing distributed economic dispatch algorithms need to know the global information when dealing with the active balance constraints of the microgrid.In essence,these dispatching algorithms still belong to the centralized dispatch mode.At present,although the network security of microgrids has received more and more attention,the economic dispatch schemes of microgrids that consider network attacks are yet to be studied.Therefore,this paper conducts related research work on how to achieve fully distributed economic dispatch of microgrids and how to resist cyber attacks.The main work of this paper is as follows:(1)This paper introduces the theory of multi-agent system and its application in micro-grid,expounds the basic concept of multi-agent,graph theory basis and consistency algorithm,and details their applications and their advantages in microgrids.(2)This paper presents the real-time distributed economic dispatch strategy of grid-connected microgrid.The traditional microgrid economic dispatch problem based on the criterion of equal slight increase rate is modeled as a discrete mathematical model based on multi-agent system.A leading agent is set up at the common connection point between the microgrid and the main grid to measure the active power at the PCC point and obtain the information of the overall active power balance of the microgrid.The consensus algorithm of the multi-agent system theory is used to solve the optimal solution of the model.And real-time tracking of active power at PCC point is realized.Finally,the economic dispatch strategy proposed in this paper is verified to realize complete distribution by MATLAB / sumilink software simulation.(3)This paper proposes a real-time distributed dconomic dispatch scheme of grid-connected microgrid considering cyber-attacks.In order to effectively reduce the impact of network attack,a set of detection algorithms is designed for distributed power generation to determine whether distributed power generation in its neighborhood is under network attack(Denial of Service Attack,False Data Injection Attack and Replay Attack).By updating the weight based on reputation value in the communication adjacency matrix,the distributed power generation under network attack is gradually marginalized or even isolated from the communication network.Simulation results show that the scheduling strategy has obvious defense function against these three common attack methods.