采用辅助变压器的可调压谐振零电压零电流开关变换器  

Voltage-regulatable Resonant Zero-voltage Zero-current Switching Converter with Auxiliary Transformer

作　　者：李彬彬[1] 王志远 张丙旭 赵晓东 徐殿国[1] LI Binbin;WANG Zhiyuan;ZHANG Bingxu;ZHAO Xiaodong;XU Dianguo(School of Electrical Engineering and Automation,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江省哈尔滨市150001

出　　处：《电力系统自动化》2022年第7期160-169,共10页Automation of Electric Power Systems

基　　金：国家自然科学基金国际(地区)合作与交流项目(51720105008)。

摘　　要：针对LLC谐振变换器在新能源、储能、数据中心、电力电子变压器等直流配电网大功率应用场景中所存在的调压困难问题,提出了一种采用辅助变压器的可调压谐振零电压零电流开关(ZVZCS)变换器。所提变换器在传统LLC谐振变换器的基础上增加了辅助变压器和辅助半桥,通过调整辅助半桥和一次侧全桥之间的移相角可以调整辅助变压器参与升压的时间,在保证主开关管软开关的前提下实现了调压功能,同时实现了辅助开关管的零电压开通。文中详细介绍了变换器的电路结构、工作原理、参数设计过程。通过100 kW仿真模型对所提拓扑的原理以及参数设计的正确性进行验证,仿真结果表明,与传统LLC谐振变换器相比,所提变换器在大功率场景下具有更优的效率。最后,搭建了2.5 kW实验样机对所提拓扑进行了有效性验证。To overcome the difficulty of voltage regulation of the LLC resonant converter in the high-power application scenarios of DC distribution network,such as renewable energy sources,energy storage,data center,power electronic transformer,this paper proposes a voltage-regulatable resonant zero-voltage zero-current switching(ZVZCS)converter with an auxiliary transformer.The auxiliary transformer and auxiliary half bridge are added in the proposed converter based on the traditional LLC resonant converter.The duration that the auxiliary transformer participates in the boost can be adjusted by changing the phase-shifting angle between the auxiliary half bridge and the primary-side full bridge.Thus,the voltage regulation function is realized on the premise of ensuring the soft switching of the main switch,and the auxiliary switches can realize zero-voltage turn-on.The circuit structure,working principle and parameter design process of the converter are described in detail.The principle of the proposed topology and the correctness of the parameter design are verified through a 100 kW converter simulation model.The simulation results show that the proposed converter has better efficiency in the high-power scenario than the traditional LLC resonant converter.Finally,a 2.5 kW experimental prototype is built to verify the effectiveness of the proposed topology.

关 键 词：直流配电网 谐振变换器 辅助变压器 零电压开关 零电流开关 移相调节 

分 类 号：TM46[电气工程—电器]