Distributed Economic Scheduling Strategy Of Microgrid Under Information Network Attack

Economic dispatching is a basic problem in microgrid.Recently,the increasing number of distributed power sources in microgrid makes its topology larger and more complicated.For the microgrid with a large number of distributed power sources in the future,the centralized scheduling method based on centralized control center will be difficult to implement.The distributed economy dispatching method only requires each generator to exchange information with its neighboring generators,and the incremental cost is calculated locally based on the multi-agent consistency algorithm.In the end,the incremental cost of each generator reaches the same level,which minimizes the total generation cost and accomplishes the economic dispatching goal.Compared with the traditional centralized economic dispatching method,distributed economic dispatching method has the advantages of high efficiency,low communication cost and strong scalability.It should be noted that the execution of distributed economic dispatching is highly dependent on the information network connecting the generators.Due to the characteristics of openness and vulnerability of the information network,it is vulnerable to various network attacks.At present,in view of the bad impact of information network attacks,governments and academic circles all over the world have paid great attention to information network security.In view of this,this paper conducts an in-depth study on how generators and communication channels in microgrid resist network attacks under information network attacks to achieve the goal of economic dispatch.The specific work of this paper is as follows:(1)A distributed elastic economic scheduling strategy based on fault isolation mechanism is proposed to solve the problem of information network attacks on generators in microgrid.By establishing the attack detection mechanism and building the generator isolation mechanism based on reputation value,the generator whose reputation value is lower than the reputation threshold is isolated from the microgrid and its operation is stopped.When the attacked generator is isolated from the microgrid,the original communication topology will be updated.Furthermore,based on the distributed consistency algorithm,the generators in the microgrid that are not affected by the attack can minimize the generation cost while meeting the power balance.The effectiveness of the distributed elastic economic scheduling algorithm is proved by MATLAB simulation.(2)Aiming at the problem of communication channel under aperiodic Do S attack in microgrid,a distributed elastic economic scheduling strategy under global Do S attack is proposed.The incremental cost security distributed consistency algorithm for the follower generator under Do S attack is constructed to optimize the generation cost and realize the goal of economic dispatch of microgrid.The stability of the algorithm is proved by Lyapunov theory,and the effectiveness of the algorithm is proved by MATLAB simulation experiment.(3)To solve the problem of Do S attack on the communication channel between generators in microgrid,a distributed elastic economic scheduling strategy based on self-triggering mechanism under local Do S attack is proposed.A self-triggering consistent algorithm for the follower generator under local Do S attack is constructed to optimize the generation cost.The stability of the algorithm is proved by Lyapunov theory.At the same time,the introduction of self-triggering mechanism realizes the on-demand transmission of information of each generator,effectively reduces the consumption of communication resources,and alleviates network congestion.MATLAB simulation results verify the effectiveness of the distributed economic scheduling algorithm.