用于直流微电网互联的双向DC-DC变换器设计  

Design of Bidirectional DC-DC Converter for DC Microgrid Interconnection

作　　者：唐志扬 胡健[1] 焦提操 李洪恩 申景潮 TANG Zhiyang;HU Jian;JIAO Ticao;LI Hong’en;SHEN Jingchao(College of Electrical and Electronic Engineering,Shandong University of Technology,Shandong Zibo 255000,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255000

出　　处：《电力电容器与无功补偿》2022年第5期148-155,共8页Power Capacitor & Reactive Power Compensation

基　　金：国家自然科学基金资助项目(61703249)。

摘　　要：为了克服由可再生能源供电的单个直流微电网的不确定性问题,可将多个直流微电网通过互联变换器连接起来构成直流微电网互联系统。针对此系统,设计了一种用于连接不同电压等级直流微电网的两级式互联变换器。互联变换器前级采用三相LLC谐振变换器拓扑,起到电气隔离和功率高效传输的作用,同时变压器采用Y-Y连接方式减少了一次侧和二次侧的电压应力并降低了输出电流纹波;后级双向直流变换器采用交错技术,降低了开关损耗和导通损耗。最后,介绍了互联变换器的控制策略,在Matlab/Simulink中进行了建模仿真,仿真结果验证了所设计的变换器的正确性,并通过与DAB变换器的对比证实了在重载运行时所设计的互联变换器具有更高的运行效率。For overcoming the uncertainty of a single DC microgrid powered by renewable energy,multiple DC microgrids can be connected through an interconnection converter to form a DC microgrid interconnection system.For this system,a two-stage interconnection converter for connecting DC microgrids with different voltage levels is designed.The front stage of the interconnected converter adopts a three-phase LLC resonant converter topology,which plays a role of electrical isolation and efficient power transmission.At the same time,the transformer uses Y-Y connection mode to reduce the voltage stress on the primary and secondary sides and reduce the output current ripple.While,the latter-stage bidirectional DC converter adopts interleaving technology to reduce switching loss and conduction loss.Finally,the control strategy of the interconnected converter is introduced.Modeling and simulation are performed in Matlab/Simulink.The correctness of the designed converter is verified by the simulation result.The comparison with the DAB converter proves that the designed interconnected converter,in case of heavy load operation,has higher operating efficiency.

关 键 词：直流微电网 互联系统 双向直流变换器 三相LLC谐振变换器 Y-Y连接 

分 类 号：TM46[电气工程—电器] TM721.1