间接矩阵谐振型电力电子变压器高频环节特性分析与开关频率设计方法  

High-frequency-link Characteristics Analysis and Switching Frequency Design Method of an Indirect Matrix Resonant Type Power Electronic Transformer

作　　者：赵聪 胡钰杰 胡洋 高范强 徐飞 李子欣 ZHAO Cong;HU Yujie;HU Yang;GAO Fanqiang;XU Fei;LI Zixin(State Key Laboratory of High Density Electromagnetic Power and Systems,Haidian District,Beijing 100190,China;State Grid Anhui Electric Power Co.,Ltd.,Electric Power Science Research Institute,Heifei 230601,Anhui Province,China;State Grid Beijing Electric Power Company,Xicheng District,Beijing 100031,China)

机构地区：[1]高密度电磁动力与系统全国重点实验室,北京市海淀区100190 [2]国网安徽省电力有限公司电力科学研究院,安徽省合肥市230601 [3]国网北京市电力公司,北京市西城区100031

出　　处：《中国电机工程学报》2025年第2期704-713,I0025,共11页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家自然科学基金项目(52007180);中国科学院前瞻战略科技先导专项资助(XDA0400000);中国科学院青年创新促进会(2022137)。

摘　　要：串联谐振型直流变换器(series-resonant DC-DC converter,SRC)是电力电子变压器的核心元件,但电容等储能元件体积大是制约电力电子变压器功率密度提高的重要因素之一,为此应尽量减小电容等无源元件体积。然而,当SRC直流侧电容减小,尤其是与谐振电容基本相当时,其高频环节电流特性与传统的直流电容较大的SRC存在很大不同。为解决上述问题,该文对比分析半桥型SRC、全桥型SRC和半桥全桥混合的SRC(混合型SRC)在不同直流电容与谐振电容比值情况下的高频环节电流特性,求解得到实现软开关时3种典型SRC开关频率设计应满足的超越方程,进一步得到其开关频率与谐振频率比值解析表达式,据此提出3种SRC高频环节开关频率设计方法。最后,通过实验验证高频环节特性分析正确性和所提出的开关频率设计方法有效性。Series-resonant DC-DC converters(SRCs)are core components for power electronic transformers(PETs).However,the energy storage components with large volume,such as capacitors,is one of the reasons that limits power density of PETs.Hence,it is usually desirable to utilize as few passive components as possible.However,the operating characteristics of SRCs change greatly if the ratio of the DC capacitors and the resonant capacitors decreases.To address this issue,this paper comparatively analyzes the operating characteristics of three typical SRCs for the indirect matrix resonant type PET,the half-bridge submodule based SRC,the full-bridge submodule based SRC and the hybrid SRC mixed with half-and full-bridge submodules.The transcendental equations about designing the switching frequency are derived,and the analytic expressions between the switching frequency and the resonant frequency are also derived.Based on the aforementioned analysis,the corresponding switching frequency design methods are proposed.Finally,experimental results verify the correctness of the presented theoretical analysis and the effectiveness of the proposed switching frequency design method.

关 键 词：间接矩阵谐振型电力电子变压器 串联谐振直流变换器 高频链路 软开关 开关频率设计 

分 类 号：TM46[电气工程—电器]