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- 저자 : Yanbing Jia (검색결과 2 건)
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Unified coordination control strategy for DC solid‑state transformer in DC microgrid
Yanbing Jia,Pei Zhao,Jinjie Tian,Xiangqi Meng,Han Wu 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.8
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.
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Modular DC Solid State Transformer with Fault-Tolerant Function
Xiangqi Meng,Yanbing Jia,Chunguang Ren,Xiaoqiang Lin,Baifu Zhang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
A modularized control method with faulttolerant function is proposed under the condition that a module of DC solid state transformer (DCSST) fails due to input short circuit. The decoupling control strategy is deduced by establishing the mathematic model of the DCSST. The maximum input voltage is selected as the reference voltage by adding diodes at the input side. The proposed system can automatically adjust the input voltage reference to keep the output voltage stability for the module in DCSST with short-circuit fault. Simulation and experiment results show that the proposed control method can decouple the output voltage and the input average voltage, maintain the output voltage stable and improve the reliability of the system when a short circuit occurs in a module of DCSST.
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