摘要
针对氢燃料电池汽车在负载突变情况下动态响应慢、直流输出电压不稳定等问题,提出一种交错并联双向DC-DC变换器(BDC)方案及一种考虑母线电压稳定的改进模型预测电流控制方法。首先对BDC变换器工作原理进行详细分析,得出传递函数并对传递函数进行z变换。然后考虑系统电压、电流跟踪情况对成本函数进行优化设计,通过求解最优控制变量实现提高系统响应速度和降低输出电流纹波以及平衡母线电压的控制目标。MATLAB/Simulink仿真及45 kW样机实验对比显示,PI控制与所提出的控制方法响应时间分别为0.05 s、0.01 s,电压超调分别为12.5 V、1.5 V,表明所提出的控制方法能很好地改善系统动态响应和输出性能。
When experiencing sudden load changes,fuel cell electric vehicle has the problems of slow dynamic response and unstable DC output voltage.In consideration of this,a scheme of interleaved bidirectional DC-DC converter(BDC)and an improved model predictive current control method considering bus voltage stability are proposed.Firstly,the working principle of the BDC converter is analyzed in detail,and the transfer function is obtained,of which the z-transformation is carried out.Then,by comprehensively considering the system voltage and current tracking situation,the cost function is optimized.And by solving the optimal control variable,the system response speed is improved,the output current ripple is reduced and the bus voltage is balanced.Finally,the comparison of MATLAB/Simulink simulation and 45 kW prototype experiment shows that the response time of the traditional current control and the proposed control method are 0.05 s and 0.01 s,and voltage overshoot is 12.5 V and 1.5 V respectively.The results show that the proposed control greatly improves the dynamic response and output performance of the system,which proves the effectiveness of the method.
作者
陈雄春
刘偲艳
钟永
CHEN Xiongchun;LIU Siyan;ZHONG Yong(Wasion Energy Technology Co.,Ltd.,Xiangtan 411104,China;Photovoltaic System Control and Optimization Engineering Laboratory of Hunan Province,Xiangtan 411100,China)
出处
《电工技术》
2023年第18期84-88,共5页
Electric Engineering
基金
湖南省自然科学基金项目(编号2021JJ60052)
湖南省湘潭市科技局课题(编号CG-YB20211032)。
