| With the increasingly severe energy problems,new energy generation and intelligent microgrid have been rapidly developed and provide a large amount of renewable energy.However,because of their own discontinuity and instability,the phenomenon of abandoning light and discarding winds is serious.The micro-grid energy storage system solves this problem very well,but it is limited by the high cost of the battery.Electric vehicles have developed rapidly due to their advantages in energy saving and emission reduction,but they are also subject to the high cost of batteries.The reuse of retired EDV power battery to the intelligent microgrid energy storage system not only solves the problem of battery recycling,but also reduces the battery cost for electric vehicles and intelligent microgrid energy storage systems,which provides new ideas for the further development of both.This article focuses on the issue of balance control of intelligent microgrid energy storage systems established using returned EDV batteries.First of all,aiming at the characteristics of the highly differentiated characteristics of the returned batteries and the continuous operation of the energy storage system.The control structure of the energy storage system was redesigned,and each battery module was connected to a controllable bypass switch.By controlling its duty cycle,the average charge-discharge current of each module is controlled,so that a reasonable distribution of the system charge and discharge currents is achieved,so that the SOC of each battery module is consistent with each other.Then,a linear control strategy was proposed to establish a linear model of the energy storage system,and its feasibility was proved by theoretical proof and practical simulation.Finally,the battery model is optimized,a nonlinear control strategy is proposed,the battery instance is estimated,the nonlinear model is established,and the simulation is performed.The work done fully demonstrated the excellent features of the new structure and control strategy,to provide a theoretical and data support for solving the balance control problem of the itelligent grid energy storage system using returned ECV batteries. |
