摘要
针对退运电池梯次利用,建立了基于半桥级联型拓扑的电池柔性成组储能系统架构,并提出了与之相适应的控制策略。储能拓扑采用半桥级联的方式实现高压输出,模块间采用无主从独立控制,具有模块化设计、结构简单、等效开关频率高、控制简单等优点。根据储能系统需求,模块采用基于下垂控制的电流控制策略,由上位机统一指令,各模块独立执行,解决了传统直接电流控制由于采样误差造成的系统难以正常工作的问题。该文进行了理论分析和仿真验证,并搭建了三模块级联实验平台,验证了基于下垂控制的电流控制策略的可行性,实现了功率控制及模块间均衡控制,所建储能系统适用于梯次电池利用。
For secondary utilization of retired power battery, the flexible battery energy storage system based on half-bridge cascade topology was studied in this paper and the control strategy was also proposed. This topology can realize high voltage output by adopting half-bridge cascaded technology,and also can achieve the none-master-slave control mode, which has many advantages of simple structure,high equivalent switching frequency, and easy control. To meet the needs of energy storage system, the modules adopt the droop control strategy independently and are managed by central computer to solve the system stability problem that is caused by sampling error in traditional current control strategy.Topology and control strategy of the proposed system was analyzed in detail, simulation and experiment results were present to verify that the system can realize the power control and equilibrium control among modules and that the system is suitable for the secondary use of battery.
引文
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