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http://dx.doi.org/10.1007/s43236-021-00247-3

Topology and start-up strategy for DC-DC transformers based on voltage balancing unit  

Zhang, Jialin (C-EPRI Electric Power Engineering Co., Ltd., NARI Group Corporation)
Zha, Kunpeng (C-EPRI Electric Power Engineering Co., Ltd., NARI Group Corporation)
Tang, Xiaojun (School of Electrical Engineering, Xi'an Jiaotong University)
Yang, Yuefeng (C-EPRI Electric Power Engineering Co., Ltd., NARI Group Corporation)
Yan, Hui (C-EPRI Electric Power Engineering Co., Ltd., NARI Group Corporation)
Wen, Fuyue (C-EPRI Electric Power Engineering Co., Ltd., NARI Group Corporation)
Shi, Mingming (State Grid Jiangsu Electric Power Co., Ltd. Research Institute)
Publication Information
Journal of Power Electronics / v.21, no.7, 2021 , pp. 1072-1083 More about this Journal
Abstract
As a core piece of equipment in DC distribution networks, DC solid-state transformers (DCSSTs) are attracting more and more attention in academia and industry. Due to the limitations in terms of the electrical stress of the switches, the input series output parallel (ISOP) structure is adopted in DCSSTs. This paper proposed an improved DCSST topology based on a voltage balancing unit (VBU). This topology has the advantages of higher power density, reduced weight, and cascaded number without compromising efficiency, cost, or reliability. The working modes, mathematical models, and control strategy are analyzed. In addition, a start-up strategy and a parameter design method are proposed in this paper. Simulation and experimental results verify the correctness and effectiveness of the proposed solution. The proposed DCSST is a practical scheme for the application of DC distribution networks.
Keywords
DC distribution network; Input series output parallel (ISOP); DC solid-state transformer (DCSST); Voltage balancing unit (VBU); Start-up strategy;
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