基于交错双沿调制的四管Buck-Boost变换器的变频控制策略  

Variable Frequency Control Strategy of Four-Switch Buck-Boost Converter Based on Interleaved Dual-Edge Modulation

作　　者：罗利江 施佳楠 任小永[1] 林聪智 Luo Lijiang;Shi Jianan;Ren Xiaoyong;Lin Congzhi(Jiangsu Key Laboratory of New Energy Generation and Power Conversion Nanjing University of Aeronautics and Astronautics,Nanjing 210016 China;Chengyi College Jimei University,Xiamen 361021 China)

机构地区：[1]南京航空航天大学江苏省新能源发电与电能变换重点实验室,南京210016 [2]集美大学诚毅学院,厦门361021

出　　处：《电工技术学报》2025年第6期1878-1887,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52177181)。

摘　　要：四管Buck-Boost变换器(FSBB)具有输入电压范围宽、输入输出同极性、控制自由度高等优势,非常适合在直流微电网中对光伏电池或储能电池起到能量管理的作用。对于FSBB的研究主要集中在效率的提升和多模式控制的平滑切换两个方面。该文针对FSBB的多模式控制方法,分析不同的控制模式对于FSBB效率的具体影响,并提出一种可以减小电感电流纹波的交错双沿调制方式;在此基础上提出一种变频控制策略,当变换器输入电压接近输出电压时能够降低开关频率以提高变换效率。在实验室搭建了一台输入8~35 V、输出28 V、满载600 W的原理样机,验证了所提变频控制策略的有效性。The four-switch Buck-Boost converter(FSBB)has the advantages of a wide input voltage range,input and output polarity,and high control degree of freedom,which is suitable for charging photovoltaic cells in a DC microgrid.At present,research on FSBB mainly focuses on the smooth switching of multi-mode control and efficiency improvement.After discussing the influence of multi-mode control and modulation mode on FSBB efficiency,this paper proposes a variable frequency control strategy that considers efficiency improvement and smooth mode switching.Through the analysis of the inductor current under multi-mode control,it can be concluded that the inductor current ripple and average value of the two-mode control are the smallest when the input and output voltages are close,and its efficiency performance is optimal.Under the same gain,reducing d2 can reduce the average value of inductance current.In addition,under the same duty cycle d2,reducing or avoiding the simultaneous conduction of S1 and S4 can reduce the ripple of the inductor current.Both are beneficial in improving the efficiency of the converter.Then,this paper proposes an interleaved dual-edge modulation method,which avoids the simultaneous conduction of S1 and S4 while ensuring that d2 is a small value.Under the two-mode control,when the converter gain is close to 1,the inductor current ripple is close to 0.The multi-switch switch works,and the switching loss ratio increases.Because the current ripple is small at this time,reducing the switching loss is convenient.The average value of the inductor current formed by the interleaved dual-edge modulation is exactly the starting and ending position values of each switching cycle.Thus,the frequency can be modified to achieve a smooth transition of the converter operating mode.A variable frequency multi-mode control strategy is proposed.Then,the half-bridge on both sides of the inductor of FSBB is divided into high-frequency and low-frequency bridges.When the input and output voltages are close,the frequency of th

关 键 词：四管Buck-Boost变换器 交错双沿调制 变频控制 模式平滑切换 

分 类 号：TM461[电气工程—电器]