三电平混合全桥DC-DC变换器回流功率优化控制  

Three-level hybrid full-bridge DC-DC converter optimal control of reflux power

作　　者：马帅旗[1] 赵佳瑶 贺海育 任思嘉 屈博锟 Ma Shuaiqi;Zhao Jiayao;He Haiyu;Ren Sijia;Qu Bokun(School of Electrical Engineering,Shaanxi University of Technology,Hanzhong 723000,China)

机构地区：[1]陕西理工大学电气工程学院,汉中723000

出　　处：《电子测量技术》2024年第17期71-79,共9页Electronic Measurement Technology

基　　金：陕西省自然科学研究项目(2023-JC-YB-442)资助。

摘　　要：针对三电平混合全桥双向DC-DC变换器存在的回流功率较大的问题,本文以回流功率最小化为目标,提出了一种基于双重移相控制的回流功率优化控制策略。首先,建立了三电平混合全桥DC-DC变换器的数学模型,分析了变换器回流功率和传输功率的特性关系;然后,以回流功率作为目标函数,通过KKT条件法将不同模式的等式和不等式约束条件转换为约束函数,并构建拉格朗日多项式函数求最佳移相比组合;最后,为提高系统动态响应的快速性,采用了环内直接功率控制方法,实现了变换器在面对突发情况时系统能迅速实现动态响应。仿真结果表明,在输入电压和负载突变时,本文提出的改进优化控制策略可以有效减小回流功率,提高系统的动态响应性能。Aiming at the issue of high reflux power in the three-level hybrid full-bridge bidirectional DC-DC converter,this paper proposes a reflux power optimization control strategy based on double phase-shift control with the objective of minimizing the reflux power.Firstly,the mathematical model of the three-level hybrid full-bridge DC-DC converter is established,and the characteristic relationship between the converter′s reflux power and transmission power is analyzed;then,taking the reflux power as the objective function,the equation and inequality constraints of different modes are converted into the constraint function by the KKT conditional method,and the Lagrange polynomial functions are constructed to find the optimal combination of the shift ratio;finally,in order to improve the rapidity of the system dynamic response,the direct power control method in the loop is adopted to realize the dynamic response of the converter in the face of unexpected situations.The simulation results demonstrate that the improved control strategy proposed in this paper can effectively reduce the reflux power and improve the dynamic response performance of the system when the input voltage and load change.

关 键 词：双向DC-DC变换器 双重移相控制 最小回流功率 KKT 

分 类 号：TN6[电子电信—电路与系统] TM46[电气工程—电器]