| 引用本文: | 郑 峰,黄雯锋,林燕贞,等.计及超级电容快速钳位饱和铁芯电压的直流故障限流器暂态特性研究[J].电力系统保护与控制,2025,53(8):105-116.[点击复制] |
| ZHENG Feng,HUANG Wenfeng,LIN Yanzhen,et al.Transient characteristics of a DC fault current limiter considering supercapacitor fast-clamped saturated core voltage[J].Power System Protection and Control,2025,53(8):105-116[点击复制] |
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| 摘要: |
| 新能源高比例接入直流配电网，其低惯量、弱阻尼特性将导致故障电流峰值大、上升速率快，给现有直流断路器的开断容量、速度带来挑战。因此，提出一种计及超级电容快速钳位饱和铁芯电压的直流故障限流器。该限流器利用超级电容器对串联于主电路的饱和铁芯快速供能，在检测到故障后通过单移相控制使超级电容快速放电，在饱和铁芯上产生特定斜率电流以钳位饱和铁芯电压，进而有效抑制故障电流幅值。此外，根据电流微分判据识别瞬时性/永久性故障：瞬时性故障时，执行无断路器动作行为的系统自恢复；永久性故障时，进一步抬升饱和铁芯钳位电压使故障线路电流过零，直流断路器快速动作、隔离故障线路。最后，搭建多端直流配电网仿真系统验证所提限流器的有效性。结果表明所提限流器能够有效抑制故障电流，消除故障区域对非故障区域的负面影响。 |
| 关键词: 直流配电网 超级电容 饱和铁芯 故障限流和隔离 钳位电压 |
| DOI：10.19783/j.cnki.pspc.240558 |
| 投稿时间：2024-05-08修订日期：2024-10-14 |
| 基金项目:国家自然科学基金项目资助(52167010)；福建省自然科学基金项目资助(2022J05026) |
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| Transient characteristics of a DC fault current limiter considering supercapacitor fast-clamped saturated core voltage |
| ZHENG Feng1,HUANG Wenfeng1,LIN Yanzhen2,LIANG Ning3,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) |
| 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. |
| Key words: DC distribution network supercapacitor saturated core fault current limiting and isolation clamping voltage |
