基于磁性元件自平衡的双极模块化多电平直流变压器  

Bipolar Modular Multilevel DC Transformer Based on Magnetic Component Self-Balancing

作　　者：王甫 李征[1] WANG Fu;LI Zheng(School of Information Science and Technology,Donghua University,Shanghai 201600,China)

机构地区：[1]东华大学信息科学技术学院,上海201600

出　　处：《电器与能效管理技术》2023年第5期30-36,50,共8页Electrical & Energy Management Technology

基　　金：国家自然科学基金重点项目(51837007)。

摘　　要：双极模块化多电平直流变压器可以满足低压用户对多电压等级、可靠供电以及用电安全等方面的需求,而由其两个直流极之间的功率不平衡所导致的电压不平衡以及不稳定问题是面临的技术挑战。基于二极管中性点箝位三电平半桥变换器,提出一种基于磁性元件自平衡的双极模块化多电平直流变压器拓扑。阐述其自平衡机理,分析开关器件的电流应力,给出了整体的控制策略。与额外使用电压平衡器相比,具有开关器件数量少、占地空间小、平衡电压能力强等优点。最后,基于MATLAB/Simulink搭建仿真模型,验证了所提拓扑结构及控制策略的有效性和可行性。The bipolar modular multilevel DC transformer meets the needs of low-voltage users for multiple voltage levels,reliable power supply and power safety.The voltage imbalance and instability caused by the power imbalance between the two DC poles are a technical challenge.A bipolar modular multilevel DC transformer topology based on magnetic component self-balancing is proposed based on a diode-neutral clamped three level half bridge converter.The self-balancing mechanism is described,the current stress on the switching devices is analysed,and an overall control strategy is given.Compared to the additional use of a voltage balancer,it has the advantages of a smaller number of switching devices,a smaller footprint and a higher voltage balancing capability.Finally,a simulation model based on MATLAB/Simulink is built to verify the effectiveness and feasibility of the proposed topology and control strategy.

关 键 词：模块化多电平 直流变压器 双极接线 自平衡 

分 类 号：TM464[电气工程—电器]