适用于柔性互联的电流源型双有源桥高频环节频域建模及设计  

Frequency Domain Modeling and Design of Current Source Type Dual Active Bridge High-frequency Link for Flexible Interconnection

作　　者：胡钰杰 朱胜龙 吴少雷 冯玉 王明 娄伟 HU Yujie;ZHU Shenglong;WU Shaolei;FENG Yu;WANG Ming;LOU Wei(State Grid Anhui Electric Power Co.,Ltd.Electric Power Science Research Institute,Hefei 230601,Anhui,China)

机构地区：[1]国网安徽省电力有限公司电力科学研究院,安徽合肥230601

出　　处：《电气传动》2024年第4期21-26,共6页Electric Drive

基　　金：国网安徽省电力有限公司科技项目(B31205230006)。

摘　　要：中低压柔性直流互联可提升配电网的灵活性和可靠性,双有源桥变换器是柔性互联装备中实现电压变换和电气隔离的关键环节。电流源谐振型双有源桥利用直流电容参与谐振和软开关设计,可大幅提高双有源桥功率密度和效率。然而,电流源谐振型双有源桥和传统电压源谐振型双有源桥特性存在较大差异,谐振腔由直流谐振电容和交流侧谐振电感组成,导致高频电流时域建模复杂,影响零电流软开关(ZCS)频率设计,难以得出ZCS开关频率与谐振频率的解析表达式。从频域角度,提出了基于基波分量的高频隔离环节等效电路建模方法,建立了ZCS开关频率与谐振频率的解析关系,仿真结果验证了所提方法的有效性和准确性。The flexible DC interconnection of medium and low voltage can improve the flexibility and reliability of the distribution network,and the dual active bridge converter is a key link in achieving voltage conversion and electrical isolation in flexible interconnection equipment.The current source resonant dual active bridge utilizes DC capacitors to participate in resonance and soft switching design,which can significantly improve the power density and efficiency of the dual active bridge.However,there are significant differences in the characteristics between the current source resonant dual active bridge and the traditional voltage source resonant dual active bridge.The resonant cavity is composed of a DC resonant capacitor and an AC side resonant inductor,which leads to complex time-domain modeling of high-frequency current and affects the frequency design of zero current switching(ZCS),making it difficult to obtain analytical expressions for the ZCS switching frequency and resonant frequency.An equivalent circuit modeling method for high-frequency isolation links based on fundamental components from a frequency domain perspective was proposed,established an analytical relationship between ZCS switch frequency and resonant frequency,and verified the effectiveness and accuracy of the proposed method through simulation and experimental results.

关 键 词：双有源桥 电流源 谐振 高频环节建模 ZCS软开关 

分 类 号：TM72[电气工程—电力系统及自动化]