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| Transient characteristics of a DC fault current limiter considering supercapacitor fast-clamped saturated core voltage |
| DOI：10.19783/j.cnki.pspc.240558 |
| Key Words:DC distribution network supercapacitor saturated core fault current limiting and isolation clamping voltage |
| Author Name | Affiliation | | ZHENG Feng1 | 1. College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
2. Fuzhou Power Supply Company, State Grid Fujian Electric Power Company, Fuzhou 350116, China
3. School of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China | | HUANG Wenfeng1 | 1. College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
2. Fuzhou Power Supply Company, State Grid Fujian Electric Power Company, Fuzhou 350116, China
3. School of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China | | LIN Yanzhen2 | 1. College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
2. Fuzhou Power Supply Company, State Grid Fujian Electric Power Company, Fuzhou 350116, China
3. School of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China | | LIANG Ning3 | 1. College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
2. Fuzhou Power Supply Company, State Grid Fujian Electric Power Company, Fuzhou 350116, China
3. School of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China | | LIU Baojin1 | 1. College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
2. Fuzhou Power Supply Company, State Grid Fujian Electric Power Company, Fuzhou 350116, China
3. School of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China |
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| Abstract:With the high proportion of renewable energy integrated into DC distribution networks, their low inertia and weak damping characteristics result in high peak fault currents and rapid rise rates, posing challenges to the breaking capacity and speed of existing DC circuit breakers. Therefore, this paper presents a DC fault current limiter which takes into account ultracapacitor fast-clamped saturated core voltage. The current limiter uses a supercapacitor to rapidly energize the saturated core in series with the main circuit. Upon fault detection, a single phase shift control is used to enable the supercapacitor to discharge quickly, generating a specific slope current in the saturated core to clamp its voltage, thereby effectively suppressing the fault current amplitude. In addition, a current differential criterion is used to distinguish transient and permanent faults. For transient faults, the system executes self-recovery without circuit breaker operation. For permanent faults, the clamping voltage of the saturated core is further increased to force the fault line current to zero, enabling the rapid operation of the DC circuit breaker to isolate the faulty section. Finally, a multi-terminal DC distribution network simulation system is established to verify the effectiveness of the proposed current limiter. The results show that the proposed current limiter can effectively suppress the fault current and eliminate the negative impact of faults on non-fault regions. |
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