三电平双向全桥多谐振DC-DC变换器研究  

Research on Three-level Bidirectional Full-bridge Multi-resonant DC-DC Converter

作　　者：张纯江[1] 李旭明 刘明[1] 郭忠南[1] 阚志忠[1] ZHANG Chunjiang;LI Xuming;LIU Ming;GUO Zhongnan;KAN Zhizhong(School of Electrical Engineering,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]燕山大学电气工程学院,秦皇岛066004

出　　处：《电源学报》2025年第1期1-10,共10页Journal of Power Supply

基　　金：国家自然科学基金资助项目(52277203)。

摘　　要：针对储能系统中通常直流母线侧电压等级较高而电池侧电压较低且电压变化范围宽的情况,提出1种三电平双向全桥多谐振DC-DC变换器拓扑,其高压侧采用三电平结构,可减小开关管的电压应力。谐振腔设计为带有辅助电感的LLCLC多谐振结构,使其等效电路左右对称,可达成正、反向工作对等驱动控制,从而实现功率双向传输。采用改进的同步变频控制策略,使高、低压侧开关管正、反向工作时均可实现全范围零电压开通。与传统LLC谐振拓扑相比,所提拓扑能够在较窄的频率范围内实现更宽范围的电压增益。通过对谐振腔参数的优化设计可使变换器同时传输电流基波和3次谐波功率,在高频段提高能量的传输效率。最后搭建2 kW实验样机,实验结果验证了理论分析的正确性。In an energy storage system,the voltage level on the DC bus side is usually higher,while the voltage level on the battery side is lower with a wide variation range.Under this background,a three-level bidirectional full-bridge multi-resonant DC-DC converter topology is proposed,in which a three-level structure is adopted on the high-voltage side to reduce the voltage stress of the switch.The resonant cavity is designed as an LLCLC multi-resonant structure with auxiliary inductance,so that the left and right sides of the equivalent circuit is symmetrical,thus realizing the peer-to-peer driving control of forward and reverse operations and the bidirectional transmission of power.An improved synchronous pulse-frequency-modulation control strategy is adopted,so that the full-range zero-voltage-switch can be realized for switches on the high-and low-voltage side regardless of the forward or reverse operation.Compared with the traditional LLC resonant topologies,the proposed topology can achieve a wider range of voltage gain in a narrower frequency range.Through the optimization design of resonant cavity parameters,the converter can transmit the current fundamental wave and third harmonic power at the same time,thereby improving the energy transmission efficiency.Finally,a 2 kW experimental prototype was built,and experimental results verified the theoretical analysis.

关 键 词：三电平 双向直流变换器 多谐振 软开关 高增益 

分 类 号：TM46[电气工程—电器]