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| Key technologies for improving the transient performance of ISOP-DAB DC systems based on hybrid current-limiting devices |
| DOI：10.19783/j.cnki.pspc.250482 |
| Key Words:dual active bridge fault characteristics novel fault current limiter fault current limiting and isolation |
| Author Name | Affiliation | | SU Senyang1 | 1. School of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
2. Yantai Haiyi Software Company Limited, Yantai 264006, China
3. Faculty of Electric Power
Engineering, Kunming University of Science and Technology, Kunming 650500, China | | LI Bintao2 | 1. School of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
2. Yantai Haiyi Software Company Limited, Yantai 264006, China
3. Faculty of Electric Power
Engineering, Kunming University of Science and Technology, Kunming 650500, China | | ZHENG Zonghua1 | 1. School of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
2. Yantai Haiyi Software Company Limited, Yantai 264006, China
3. Faculty of Electric Power
Engineering, Kunming University of Science and Technology, Kunming 650500, China | | ZHENG Feng1 | 1. School of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
2. Yantai Haiyi Software Company Limited, Yantai 264006, China
3. Faculty of Electric Power
Engineering, Kunming University of Science and Technology, Kunming 650500, China | | LIANG Ning3 | 1. School of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
2. Yantai Haiyi Software Company Limited, Yantai 264006, China
3. Faculty of Electric Power
Engineering, Kunming University of Science and Technology, Kunming 650500, China |
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| Abstract:To address the challenges of low line impedance, excessive current peaks, and long recovery time under short-circuit conditions in dual active bridge (DAB) converters, this paper proposes a novel hybrid current-limiting device integrating coupled inductors a high-frequency chopper circuit. First, a transient mathematical model of the DC system incorporating the proposed current-limiting device is derived, and the current-limiting principle is explained. The impacts of critical parameters such as resistance, inductance, and transformer turns ratio on the current-limiting performance are systematically analyzed. Subsequently, a voltage derivative criterion is developed for rapid fault detection, while permanent/transient fault discrimination is achieved through continuous monitoring of the DAB output voltage, enabling coordinated operation with DC circuit breakers for precise interruption. Finally, comprehensive simulations are conducted on an input series output parallel-dual active bridge (ISOP-DAB) DC system under transient and permanent faults as well as pole-to-pole/pole-to-ground short-circuit faults. The simulation results demonstrate that, compared with conventional current limiters, the proposed solution reduces the short-circuit current peak by over 85% and shortens the fault isolation time by more than 40%, exhibiting superior performance in fault current suppression and system recovery acceleration. |
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