基于电路分解模型的三有源桥电流有效值优化控制策略  

Optimal Control Strategy for Triple Active Bridge Current RMS Based on Circuit Decomposition Model

作　　者：兰征 王雪丽 余雪萍 邹彬[1] 刘贝[2] Lan Zheng;Wang Xueli;Yu Xueping;Zou Bin;Liu Bei(College of Electrical and Information Engineering,Hunan University of Technology,Zhuzhou 412007,China;National Electric Power Conversion and Control Engineering Technology Research Center Hunan University,Changsha 410082,China)

机构地区：[1]湖南工业大学电气与信息工程学院,株洲412007 [2]国家电能变换与控制工程技术研究中心(湖南大学),长沙410082

出　　处：《电工技术学报》2024年第20期6488-6501,共14页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(51807058);湖南省教育厅优秀青年项目(22B0603);湖南省自然科学基金项目(2021JJ50059)资助。

摘　　要：三有源桥DC-DC变换器(TAB)作为可再生能源、电动汽车和储能等灵活接入直流电网的有效解决方案,在直流电网中应用前景十分广阔。该文针对TAB在单移相控制(SPS)下电感电流有效值较大,而移相加脉宽控制(PS-PWM)下数学模型复杂难以求解的问题,提出一种基于电路分解模型的TAB电感电流有效值优化控制策略。首先分析TAB在PS-PWM下的工作原理,建立PS-PWM下的电路分解模型,得出不同工作模式下各端口功率和电感电流有效值的统一表达式,然后,构建TAB各端口的电感电流有效值二次方和的优化数学模型,并采用遗传算法求解最优移相角。仿真和实验结果表明,所提分析方法和控制策略能够降低模型的复杂度及计算难度,有效减小各端口的电感电流有效值二次方和,并提高系统效率。As an effective solution for renewable energy,electric vehicles,and energy storage flexible access to the DC grid,the triple active bridge DC-DC converter(TAB)has widespread adoption in the DC grid.The main research of TAB involves topology improvement,decoupling control strategy,modeling methodology,and soft-switching characteristics.However,the rms value of the inductor current,as an important indicator affecting the efficiency of TAB,has few optimization studies.Therefore,this paper focuses on the rms value optimization for inductor current in TAB.As the most basic control strategy of TAB,the SPS control strategy is simple and easy to implement.However,it has many shortcomings,such as few control degrees of freedom,low flexibility,increased loss,and reduced operating efficiency of the TAB.PS-PWM control strategy is usually used to optimize these objectives,but the mathematical model under PS-PWM control is complex.This paper proposes a TAB inductor current rms optimization control strategy based on the circuit decomposition model.Firstly,the operating principle of TAB under PS-PWM is analyzed,and the circuit decomposition model under PS-PWM is established.Then,the unified expressions for the power and the rms value of the inductor current at each port under different operating modes are derived.The optimized mathematical model for summing the rms value squares of the inductor current at each port of the TAB is constructed,and a genetic algorithm is applied to reduce the inductor current rms value by the optimal shift ratio.Simulation and experimental results show that the proposed analysis method and control strategy can reduce the complexity and computational difficulty of the model.The rms value of inductance current at each port is effectively reduced,and the system efficiency is improved.The following conclusions can be drawn.(1)The on-state loss of the TAB is proportional to the square of the rms value of the inductor current.The sum of rms value squares of the inductor currents is primarily related to th

关 键 词：三有源桥 电流有效值 遗传算法 移相加脉宽调制 DC-DC 变换器 

分 类 号：TM72[电气工程—电力系统及自动化]