基于LCL滤波的电动汽车充放电控制策略及仿真分析

Control Strategy and Simulation Analysis of Electric Vehicle Charge and Discharge Based on LCL Filter

分析了3种典型的电动汽车充放电拓扑的优缺点,并针对基于LCL型滤波器的充放电拓扑电路,提出了一种基于双闭环控制策略的低纹波大功率充放电控制方法,即对动力电池电流采用变换器侧滤波电感电流为内环、动力电池电流为外环;对动力电池电压采用变换器侧滤波电感电流为内环、动力电池电压为外环的双闭环控制。设置了3个前馈控制器和2个限幅控制器,提高了充放电系统的稳定性和动态响应特性,实现了充放电控制过程中的低纹波限幅控制。搭建了三相LCL滤波的充放电系统仿真控制模型,仿真结果表明本文提出的双闭环控制方法能够实现不同充放电控制模式的无缝切换,电压和电流纹波控制在0.5%以内。

This paper analyzed the advantages and disadvantages of three typical charge-discharge topologies for electric vehicles,and proposed a low ripple high-power charge-discharge control method based on double closed loop control strategy for the charge-discharge topology circuit based on LCL filter.For the current of the power battery,the filter inductance current on the converter side served as the inner loop and the current of the power battery served as the outer loop.For the power battery current,the filter inductance current on the converter side served as the inner loop and the voltage of the power battery served as the outer loop.Three feedforward controllers and two limiting controllers were set up to improve the stability and dynamic response characteristics of the charge-discharge system,and the low ripple limiting control were realized during the process of charge-discharge control.A simulation control model of a three-phase LCL filter charging-discharging system is built.The simulation results showed that the double closed loop control method proposed in this paper can realize the seamless switching of different charge-discharge control modes with voltage and current ripple controlled within 0.5%.