全移相双有源全桥直流变换器的瞬态电流偏置抑制策略  

Transient Current Bias Suppression Strategy of Full Phase Shifting Dual Active Full Bridge DC Converter

作　　者：吴春华 陈修淋 李智华 汪飞 Wu Chunhua;Chen Xiulin;Li Zhihua;Wang Fei(Shanghai Key Laboratory of Power Station Automation Technology Department of Electrical Engineering Shanghai University,Shanghai 200444 China)

机构地区：[1]上海大学电气工程系上海市电站自动化技术重点实验室,上海200444

出　　处：《电工技术学报》2024年第4期1116-1131,共16页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51677112)。

摘　　要：针对双有源全桥(DAB)直流变换器在功率突变时产生的电流偏置问题,该文提出一种新的瞬态直流偏置抑制策略。首先,以基于全移相调制的双有源全桥直流变换器为研究对象,分析DAB变换器产生直流偏置的原因及危害。然后,在全局电感电流应力最优结果的基础上,对功率在四个工作区域突变时产生的瞬态直流偏置问题进行详细分析,推导各种电流突变情况下的直流偏置表达式,并据此提出一种新的过渡态引入方法,对于不同的功率突变状态可以得到统一的过渡移相角表达式,简化了控制过程。接着,根据所得过渡态结果,提出统一的载波调制方法,并对调制策略的适用性进行分析。最后,通过实验平台验证了所提方法可以有效消除功率突变时产生的电流偏置。The research on dual active full-bridge(DAB)converters mainly focuses on phase-shifting methods,topology,and dynamic response.Among them,phase shift methods include single phase shift,double phase shift,extended phase shift,and triple phase shift.These different phase-shifting methods correspond to different inductor current stress and reflux power,but the ultimate goal is to obtain higher transmission efficiency.When the transmission power changes suddenly,the traditional phase shifting method will cause the circuit current to generate a DC bias.This biased current will increase the current stress of the inductor,and in severe cases,it will also cause the transformer to be biased.Therefore,a transition state is introduced to suppress the DC bias when the power changes suddenly.Firstly,the DAB converter based on full phase-shift modulation is taken as the research object.The current of the bridge arm on the low-voltage side of the DAB converter with this structure is reduced by half,and the voltage of the transformer on the secondary side is also reduced by half.Therefore,the conduction loss can be reduced,and the transmission efficiency can be improved.The global optimal solution of inductor current stress can be obtained by full phase shift modulation.The optimal solution is divided into four regions,and the sudden current change in each optimal region is analyzed.Two kinds of phase shifting states are divided,and each phase shifting state corresponds to a different relationship between the magnitude of the phase shifting angle.The sudden power change is discussed in the same direction and reverses sudden change in these two phase-shifting states.The corresponding current bias results can be obtained when the power changes suddenly in the full range.This result with a three-dimensional surface diagram fully reflects the magnitude of the inductor current bias generated when the power changes suddenly.Then,a new DC bias suppression strategy is proposed,which adopts a unified transition state introduction method f

关 键 词：双有源全桥(DAB)变换器 功率突变 瞬态直流偏置抑制 全移相控制 载波调制 

分 类 号：TM614[电气工程—电力系统及自动化]