节点文献
动力蓄电池维护设备的优化设计
Optimization Design of Power Battery Maintenance Equipment
【作者】 赵迪；
【导师】 姜久春；
【作者基本信息】 北京交通大学 ， 电气工程， 2012， 硕士
【摘要】 随着石油资源的日益枯竭,绿色环保的纯电动汽车受到普遍关注。动力蓄电池作为电动汽车的动力源,在使用过程中会出现性能下降的情况,因此需要定期对其性能进行检测与维护。相比于同类进口设备,现有10kW电池维护设备在控制精度、容量等方面存在差距。因此,需要对现有设备的控制系统进行优化升级。鉴于进口设备主电路多采用多通道的并联结构,实现10kW电池维护设备并联运行,是比较切实可行的扩容方案。本文对现有10kW电池维护设备的控制系统进行优化,电池维护设备采用PWM整流器+双向DC/DC级联结构,两部分控制系统相互独立,因此需要对两部分控制系统分别进行优化设计。本文改进了PWM控制策略,在原有双闭环控制策略中加入了重复控制器补偿,以减小交流电流谐波。设计了基于平均电流模式控制,三环控制结构的双向DC/DC并联控制系统。应用最大电流自动均流法,提出了以UCC39002均流芯片为核心的双向DC/DC并联均流控制系统硬件设计方案。同时,建立了DC/DC模块并联系统Matlab/Simulink仿真模型,完成了设备样机和并联实验平台的搭建。实验表明,对PWM整流器控制策略进行优化后,交流电流波形明显改善,满载时交流电流THD下降了3.4%。采用三环DC/DC均流控制方案,实现整机并联运行,模块间不均流度最大为3.2%,符合<5%的设计要求。
【Abstract】 With the rapid consumption of oil resources, pure electric vehicle draws wide attention. Power storage batteries which performance will slide down significantly in use process are the power source of the electric car. So it is necessary to periodically test and maintain batteries performance.Comparing the imported equipment and existing10kW battery maintenance equipment, there is certain disparity in control precision and volume. In view of most imported equipment is used channel parallel structure, realizing lOkW battery maintenance equipment parallel operation is a feasible scheme to increase capacity.The control system of existing10kW battery maintenance equipment is optimized in this paper. The existing10kW battery maintenance equipment consist of PWM rectifier and Bi DC/DC converter which have independent control system, so it is necessary to optimize control system of two module respectively. The PWM control system is optimized by add a repetitive controller to improve AC current and reduce current THD. The parallel function is added in DC/DC control system, which apply the maximum current automatic current sharing method. The structure of DC/DC control system is current, voltage and current sharing three loop control structure. The Bi DC/DC parallel control system hardware is designed which based on UCC39002current sharing chip. And the parallel system Matlab/Simulink simulation model and parallel experiment platform is built. Experimental results show that using new PWM rectifier control strategy system AC current THD reduce3.4%in full load and parallel of equipment is realized with current sharing error is no more than3.?%which satisfy the design requirements.