Research On Battery Management System Based On Fast Switch In Microgrid

In order to alleviate the problems of global energy crisis and environmental pollution,distributed renewable energy such as wind and light has attracted more and more attention.The establishment of microgrid power generation based on distributed power supply is the development and utilization of clean energy such as wind and solar,but the characteristics of new energy make the power system of the microgrid more volatile.The battery management system can effectively suppress fluctuations by controlling the energy storage battery pack in the microgrid.In this context,the control switch of the battery management system and the estimation of the charge state of the battery in the microgrid are studied in this paper.Firstly,this paper describes the basic structure and operation mode of microgrid,determines the type of microgrid structure,and completes the construction of microgrid and the design of energy storage system.It also points out the importance of the control switch speed and SOC estimation to the operation of the battery management system in the microgrid.Secondly,the third chapter analyzes the damage caused by the delay time of the switch of the energy storage battery pack.Therefore,the application of the fast switch to the design of the battery management system is proposed.The battery management system structural model was established by using the fast switch instead of the traditional switch,and the core driver of the fast switch was designed in detail.Then the superiority of the fast switch was verified through experiments.Then,in the fourth chapter,the SOC algorithm of battery management system is deeply studied,and the basic principles and characteristics of the Ah-integral method and the Kalman filter KF method are analyzed.The EKF modified Ah integral method is proposed to estimate the SOC.At the same time,the battery equivalent circuit model was established and the accuracy of the equivalent model was verified.Then,the EKF modified Ah integral method was established by the equivalent circuit model and the EKF modified Ah integral method was simulated.The results show that this method can estimate SOC accurately and has certain anti-interference.Finally,according to the structure of microgrid designed in chapter 2,the model of microgrid is established with the actual data in the fifth chapter and the simulation and verification of the role of the improved battery management system in the micro-grid were performed.The results show that the application of fast switching shortens the delay time when the switch is switched and the improvement of the SOC algorithm improves the service efficiency of the energy storage battery pack in the microgrid.In the end,it is verified that the optimized battery management system can effectively stabilize the fluctuation of microgrid.