Distributed Optimal Operation Strategy Of Energy Storage Unit In Micro Grid

In recent years,MicroGrid gets a widely attention and rapidly development,MicroGrid is an important part of the smart grid.And Micro Grid is also an important using form of renewable energy power generation such as wind and solar power,but the impacts which caused by the intermittency of renewable energy power generation and the randomness of load demand may bring new challenges to balance the active power in MicroGrid,especially with high penetration levels.For autonomous MicroGrid,it cannot balance the active power as the inequality between the available renewable generation and the total load demand which is caused by renewable generation fluctuations.Therefore,the introduction of Energy Storage Unit can solve the problem of the active power imbalance in MicroGrid caused by the intermittency of renewable energy power generation and the randomness of load demand effectively.This paper is dedicated to solve the power balance controling problem of Energy Storage Unit in Micro Grid by distributed optimization algorithm.The specific work is as follows:1)Because of the economy,flexibility and robustness of distributed control strategy,a distributed gradient algorithm for Energy Storage Unit control to balance the active power in MicroGrid is proposed.The control objective of this strategy is minimizing the total active power loss during the charging/discharging process,with the linear relationship among charging/discharging efficiency,charging/discharging rate and State of Charge considered.2)This paper proposed a distributed optimal operation strategy of Energy Storage Unit in MicroGrid based on the equivalent circuit model of the energy storage unit.With the optimal charging problem of Energy Storage Unit in MicroGrid modeling analysis,then use the distributed algorithm to optimize a model established.3)This paper proposed an attack-resilient distributed scheduling strategy of Energy Storage Unit based on the model of Energy Storage Unit control to balance the active power in MicroGrid.The response of the Energy Storage Unit is analyzed respectively with the cyber-attack in network control system of Micro Grid or not,then design an attack-resilient distributed scheduling strategy of Energy Storage Unit to solve cyber-attack.In this article,the results of each work are demonstrated through MATLAB simulation analysis,and the effectiveness of the proposed method of each work is demonstrated through simulation and analysis.