| 引用本文: | 王江天,王兴国,马静,周泽昕.基于电容换流的限流式直流断路器[J].电力系统保护与控制,2018,46(24):180-186.[点击复制] |
| WANG Jiangtian,WANG Xingguo,MA Jing,ZHOU Zexin.Current limiting and capacitor commutated hybrid DC circuit breaker[J].Power System Protection and Control,2018,46(24):180-186[点击复制] |
|
| 摘要: |
| 随着柔性直流输电技术逐渐扩展到架空线输电场合，故障线路的快速识别和隔离显得尤为重要。相比于电缆线路，架空线输电易发生短路、闪络等瞬时故障，必须采取相应措施隔离故障线路，避免系统停运。直流断路器作为隔离故障线路的核心设备受到了国内外的高度重视。简要阐述了现有混合型直流短路器的研究现状，在已有直流断路器技术方案的基础上提出了一种新型混合型直流断路器拓扑。该断路器通过限流电感可有效抑制短路电流幅值，依靠电容缓冲作用，避免了大数量级IGBT串联的同步驱动及均压问题。在PSCAD/EMTDC仿真平台上搭建了四端对称双极柔性直流电网模型，仿真验证该直流断路器可满足高压直流电网快速切除故障线路的需求。 |
| 关键词: 多端直流电网 直流输电 架空线 故障限流 高压直流断路器 |
| DOI：10.7667/PSPC171834 |
| 投稿时间：2017-12-18修订日期：2018-01-12 |
| 基金项目:国家电网公司科技项目(JBB17201600241)“±500 kV柔性直流电网对交流电网保护影响研究” |
|
| Current limiting and capacitor commutated hybrid DC circuit breaker |
| WANG Jiangtian,WANG Xingguo,MA Jing,ZHOU Zexin |
| (NARI-Relays Electric Co., Ltd., Nanjing 211102, China;State Key Laboratory of Power Grid Safety and Energy Conservation, China Electric Power Research Institute, Beijing 100192, China;State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China) |
| Abstract: |
| With MMC-HVDC technology gradually expanding to overhead line transmission occasions, the rapid identification and isolation of fault lines is particularly important. Compared with the cable line, the overhead line transmission is prone to happening short circuit, flashover and other transient faults, and corresponding measures must be taken to isolate the fault line to avoid system outage immediately. DC circuit breaker has captured great attention from the community at home and abroad as the core equipment of isolating fault circuit. A new type of hybrid DC circuit breaker topology is proposed based on the existing DC circuit breaker technical scheme. The circuit breaker can effectively restrain the amplitude of short circuit current through the current limiting inductance, and avoid the synchronous driving and voltage sharing of large orders of IGBT series by means of capacitive buffer action. A model of four-terminal double bipolar HVDC grid is built on the PSCAD/EMTDC, and the simulation results show that the DC circuit breaker can meet the demand of fast resection of the fault line. This work is supported by Science and Technology of State Grid Corporation of China (No. JBB17201600241) “Study on AC Power Grid Protection Influenced by ±500 kV Flexible DC Power Grid”. |
| Key words: multi-terminal DC system HVDC transmission overhead line fault limitation HVDC circuit breaker |
