基于PSIM的车载开关电源并联供电系统设计与仿真

Design and Simulation for the Parallel System of Switching Power Supply for NEV Based on PSIM

新能源电动汽车中的电子设备越来越多,其功率等级也在大幅增加,这些均提出了对车载供电电源性能更严苛的要求,现代的新能源汽车车载电源需要满足低电压与大电流,高功率密度、体积及较高的动静态等要求,基于上述车载供电电源的严苛要求,设计了一种可用于纯电动车的车载开关电源并联系统,拓扑方式为降压斩波双Buck并联电路,详细地介绍了各关键元器件的参数选择方法,控制模式采用双环控制模式,同时还详细介绍了电流环与电压环设计流程。为了加速系统响应速度,减小偏差,提高系统的稳定性与准确性,采用了前馈控制,最后基于电力电子与电源专业仿真软件PSIM2021a软件构建了电源系统的仿真模型,对所搭建的降压斩波双Buck电路并联供电系统进行了仿真验证。仿真结果表明,所设计的基于Buck电路的开关电源供电系统其动静态特性良好,抗干扰能力较强,达到了设计要求。

There are more and more electronic devices in new energy electric vehicles,and their power levels are also increasing significantly.These all put forward more stringent requirements for the performance of on-board power supply.Modern on-board power supply of new energy vehicles needs to meet the requirements of low voltage and high current,high power density,volume and high dynamic and static state.Based on the above stringent requirements of on-board power supply,an on-board switching power supply parallel system that can be used for pure electric vehicles was designed.The topology mode was step-down chopper Buck parallel circuit.The parameter selection method of key components was introduced in detail.The control mode adopted double loop control mode.At the same time,the design process of current loop and voltage loop was introduced in detail.In order to accelerate the response speed of the system,reduce the deviation and improve the stability and accuracy of the system,the feedforward control was adopted.Finally,the simulation model of the power supply system was constructed based on the professional simulation software PSIM2021a of power electronics and power supply.The simulation results show that,the designed switching power supply system based on buck circuit has good dynamic and static characteristics and strong anti-interference ability,which meets the design requirements.