动力锂电池均衡控制用电源的研制

发布时间：2018-03-23 06:24

本文选题：轨道交通　切入点：电池均衡　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：锂离子电池在各个领域的应用越来越广泛,尤其在轨道交通领域其作为动力系统和储能系统发挥着至关重要的作用。但是循环充放电的过程,会导致电池组内单体电池的不一致性。造成这种不一致性的原因主要是由于电池的生产水平不够高和使用环境不够好。电池的不一致性会使其容量和能量利用率降低、功率能力受到限制,甚至会缩短寿命。为解决这个问题,需要对电池进行均衡控制。电池均衡的方法有很多,其中双向DC/DC隔离转换均衡法以其均衡精度高、速度快、效率高的特点被人们广泛使用。本文针对电池均衡的应用背景,结合电池组实际的功率参数研制了一台隔离型双向DC/DC变换器,具体研究内容如下:首先,对隔离型双向DC/DC变换器的拓扑进行选择,将变压器两边分为高压侧和低压侧,分别对变压器两侧的整流或逆变环节进行拓扑对比并筛选,最终选择了集成滤波的推挽正激倍流拓扑。然后对此拓扑进行分析,主要包括降压模式和升压模式下的工作原理分析,并详细地介绍了箝位电容的作用和耦合电感对电路的影响。然后介绍磁集成的具体方法,阐述了磁件的两种常用建模方法:磁路-电路对偶变换法和磁导-电容类比建模法;介绍了磁件绕组的拆分方法:源转移等效变换法;并详细地描述了电感和变压器进行磁集成的步骤。其次,对此隔离型双向DC/DC变换器进行设计。首先对变换器进行建模,然后对集成变压器的参数、高压侧的箝位电容、低压侧的滤波电容、功率开关管的损耗与驱动电阻等参数进行计算,并对主电路、缓冲电路、驱动电路、电压电流检测电路以及软件控制进行设计。最后,根据上述原理分析与电路设计,对磁集成后的变换器进行仿真分析;搭建了相应的实验平台,对变换器低压侧不同的工作电流进行了调试,使变换器的输入输出电压、电流均满足目标参数,并对实验结果进行分析。
[Abstract]:Lithium-ion batteries are widely used in various fields, especially in the field of rail transit, which plays a vital role as a power system and energy storage system. The inconsistency of the single cell in the battery pack is mainly due to the low level of production of the battery and the poor environment in use. The inconsistency of the cell reduces its capacity and energy utilization. In order to solve this problem, battery equalization control is needed. There are many methods of battery equalization, among which the bidirectional DC/DC isolation and conversion equalization method has high equalization accuracy and high speed. The characteristics of high efficiency are widely used. In this paper, according to the application background of battery equalization and the actual power parameters of battery pack, an isolated bi-directional DC/DC converter is developed. The main contents are as follows: firstly, The topology of isolated bidirectional DC/DC converter is selected. The two sides of transformer are divided into high voltage side and low voltage side. Finally, the push-pull forward doubler topology with integrated filtering is selected, and then the topology is analyzed, including the working principle analysis of the step-down mode and the boost mode. The function of clamping capacitance and the influence of coupling inductor on circuit are introduced in detail. Then the specific method of magnetic integration is introduced, and two common modeling methods of magnetic component are described: magnetic circuit dual transformation method and magnetic conductance capacitance analogy modeling method. This paper introduces the separation method of magnetic part windings: source transfer equivalent transformation method, and describes in detail the steps of magnetic integration of inductors and transformers. Secondly, the isolated bi-directional DC/DC converter is designed. Then the parameters of the integrated transformer, the clamping capacitance of the high-voltage side, the filter capacitance of the low-voltage side, the loss of the power switch and the driving resistance are calculated, and the main circuit, the buffer circuit, the drive circuit, etc. The voltage and current detection circuit and software control are designed. Finally, according to the above principle analysis and circuit design, the magnetically integrated converter is simulated and analyzed. The different operating current at low voltage side of the converter is debugged to make the input and output voltage and current of the converter meet the target parameters and the experimental results are analyzed.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46

【参考文献】