无源控制下的动力电池多路均衡技术研究

针对当前动力电池均衡方案响应太慢、效率不高的问题,设计了一种基于反激变换器的多路均衡电路,该电路仅在常用双向均衡拓扑的基础上加上均衡电阻和旁路开关,即能实现多路能量转移.建立了带有源负载时的功率模块状态空间模型,根据非线性无源控制的相关理论,判定功率模块为线性无源,设计了无源控制器.引入无源控制后,均衡电流得到很好的控制,Matlab/Simulink仿真结果表明,无源控制下的多路均衡方案能进一步提高均衡响应速度,降低系统损耗.

Research on Multi-Channel Equalization of Power Battery Under Passivity-Based Control

For defects on too slow response and not high efficiency in the current power battery equalization schemes,a multi-channel equalization circuit based on fly-back DC-DC converter is designed.The circuit scheme can achieve multi-channel energy transfer with the addition of balanced resistance and bypass switch only on the basis of common bi-direction balanced topology.The state space model of DC-DC power module with active load is established.According to the theory of passivity-based control on non-linear system,the module is judged to be linear passive,the passivity-based controller is designed.With passivity-based control,the equalization current is well controlled.Results of Matlab/Simulink simulation show that the response of multi-channel scheme is fast,and its energy loss is less than scheme with open-loop control.