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http://dx.doi.org/10.1007/s43236-022-00432-y

Unified coordination control strategy for DC solid-state transformer in DC microgrid  

Jia, Yanbing (College of Electrical and Power Engineering, Taiyuan University of Technology)
Zhao, Pei (College of Electrical and Power Engineering, Taiyuan University of Technology)
Tian, Jinjie (Datong Power Supply Company, State Grid Shanxi Electric Power Company)
Meng, Xiangqi (College of Electrical and Power Engineering, Taiyuan University of Technology)
Wu, Han (College of Electrical and Power Engineering, Taiyuan University of Technology)
Publication Information
Journal of Power Electronics / v.22, no.8, 2022 , pp. 1374-1385 More about this Journal
Abstract
The existing control strategies of DC solid-state transformer (DCSST) are based on DC distribution system, which is mainly concentrated on one side voltage stability control without considering the change of control objectives under different conditions. Thus, they are unsuitable for multiterminal and multisource DC microgrid. The coordinated control strategy of DCSST in multiterminal and multisource DC microgrid is studied in this paper. The DCSST circuit models based on the series-parallel structure of dual active full bridge converter are established, and the basic control modes are analyzed: control low voltage mode and control high voltage mode. Combined with the characteristics of DC bus voltage fluctuation and the operation conditions of DCSST, a unified coordinated control strategy is proposed. Experimental results show that the proposed control strategy can correctly identify the different power states of the two sides of the system, control the power exchange between the two sides of the system, and maintain the stable operation of the whole DC system.
Keywords
DC microgrid; DC solid state transformer (DCSST); Bus voltage; Coordinated control;
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