标题：Analysis and Control of N-level Neutral-point Clamped Dual Active Bridge DC-DC Converter with Capacitor Voltage Balance
作者：Deng, Zhaozhe ;Wang, Guangzhu ;Wang, Ke ;Hao, Yunjian
作者机构：[Deng, Z] School of Electrical Engineering, Shandong University, Jinan, China;[ Wang, G] School of Electrical Engineering, Shandong University, Jinan, 更多
会议名称：2018 International Conference on Power System Technology, POWERCON 2018
会议日期：6 November 2018 through 9 November 2018
来源：2018 International Conference on Power System Technology, POWERCON 2018 - Proceedings
关键词：capacitor voltage balance; DC-DC; dual active bridge; n-level; neutral-point clamped
摘要：Dual active bridge (DAB) dc-dc converter combined with multilevel topology is popular in medium and high voltage areas. This paper proposes an n-level neutral-point clamped (NPC) dual active bridge dc-dc Converter, of which has multilevel diode-clamped bridges. The modulation of the proposed converter is introduced and the power flow equations under different phase shift angles are deduced. Similar to other NPC topology, capacitor voltage unbalance also exists in the proposed converter. In order to realize capacitor voltage balance, the capacitor currents are analyzed using space vector and the relationship between capacitor currents and voltage waveforms of the bridge output is presented. The voltage balancing strategy is designed based on adjusting the length of vectors. The theory and control scheme are confirmed with the simulations. © 2018 IEEE.