| 引用本文: | 余银钢,潘天红.基于振荡过零回路的限峰限流装置设计及限流特性分析[J].电力系统保护与控制,2025,53(8):178-187.[点击复制] |
| YU Yingang,PAN Tianhong.Peak current limiting device design using an oscillating zero crossing circuit and current limiting characteristics analysis[J].Power System Protection and Control,2025,53(8):178-187[点击复制] |
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| 摘要: |
| 工矿企业的配电网系统短路电流超标是威胁设备稳定运行的最严重因素。为此，提出了一种LC串联再并联于主断路器的电气回路，其电流频率约为1.3 kHz。该高频电流与系统短路故障电流同时流过主断路器，强制短路电流提前过零，实现真空环境下电气开断的短路限流策略。该策略设计一种分闸时间小于1.2 ms的超高速真空断路器和LC高频振荡回路并联的强制过零单元，可及时切断主回路并投入限流电抗器，实现对短路电流的有效抑制。在此基础上，详细分析了限流装置的运行机制、关键参数设计以及该技术在实际配电网中的应用潜力。通过仿真与实体试验验证，所设计的限流装置能够将短路峰值限制在实际值的70%以下，显著降低短路电流的峰值水平，有效减轻对配电网设备的冲击，进而显著提升了系统运行的稳定性。 |
| 关键词: LC高频振荡回路 强制过零 超高速真空断路器 限峰限流 |
| DOI：10.19783/j.cnki.pspc.240456 |
| 投稿时间：2024-04-15修订日期：2024-08-16 |
| 基金项目:安徽省科技创新攻坚计划项目资助(202423i 08050033)；国家自然科学基金项目资助(52377164) |
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| Peak current limiting device design using an oscillating zero crossing circuit and current limiting characteristics analysis |
| YU Yingang1,2,PAN Tianhong1 |
| (1. School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China; 2. Anhui Province Joint
Construction Discipline Key Laboratory of High Reliable Power Distribution Technology, Hefei 230088, China) |
| Abstract: |
| Excessive short-circuit current in distribution networks of industrial and mining enterprises is one of the most severe threats to the stable operation of equipment. To address this issue, an electrical circuit comprising an LC series circuit connected in parallel with the main circuit breaker is proposed, generating a current frequency of approximately 1.3 kHz. The high-frequency current flows through the main circuit breaker along with the system short-circuit fault current, forcing the short-circuit current to reach zero earlier and enabling a short-circuit current-limiting strategy in a vacuum condition. The proposed strategy incorporates an ultra-high-speed vacuum circuit breaker with an opening time of less than 1.2 ms, and a parallel LC high-frequency oscillatory circuit as a forced zero-crossing unit. This setup allows the main circuit to be rapidly interrupted, while a current-limiting reactor is subsequently introduced to effectively suppress the short-circuit current. Furthermore, this paper provides a detailed analysis of the operating mechanism of the current-limiting device, key parameter design, and its potential application in real-world distribution networks. Simulation and experimental validations demonstrate that the proposed current-limiting device can limit the short-circuit peak to below 70% of the actual value, thereby significantly reducing the peak short-circuit current, mitigating the adverse impact on distribution network equipment, and substantially enhancing the overall system operational stability. |
| Key words: LC high-frequency oscillatory circuit forced zero-crossing ultra-high speed vacuum circuit breaker peak current limiting |
