摘要
电动汽车直流动力源的特殊性和对驱动性能的高品质要求决定车用DC/DC变换器要有稳定的电压、电流输出。针对DC/DC变换器在车辆行驶状态切换过程中呈现的严重非线性问题,提出了电流环沿用传统PI控制,电压环采用模糊PI控制的双闭环斩波控制方案;在分析双向DC/DC变换器工作原理的基础上,根据变换器自身的变结构特性,设计了模糊PI控制器。仿真结果表明,本控制方案可有效提高变换器的鲁棒性,减小输出电压波动。
The particularity of electric vehicles DC power source and high quality requirement determine that DC /DC converter requires stable voltage and current output.To solve the serious nonlinear problem in process of vehicle's status switching,chop-control is adopted which is composed by conventional PI control in current loop and fuzzy PI control voltage loop.In the analysis of bi-directional DC/DC converter working principle,the fuzzy PI controller is designed based on the change of its own structural characteristics of the converter.The simulation results show that the control scheme effectively improves the robustness of the converter and reduces the output voltage fluctuations.
出处
《大功率变流技术》
2012年第1期13-16,43,共5页
HIGH POWER CONVERTER TECHNOLOGY
