中国电力 ›› 2021, Vol. 54 ›› Issue (1): 54-61.DOI: 10.11930/j.issn.1004-9649.202006108

• 国家“十三五”智能电网重大专项专栏:(四)柔性直流电网技术、装备与工程 • 上一篇    下一篇

直流断路器用IGBT正向恢复特性实验建模

沈弘1, 仝翠芝1, 东野忠昊1, 齐磊1, 王谦2   

  1. 1. 新能源电力系统国家重点实验室(华北电力大学),北京 102206;
    2. 国网北京电力科学研究院,北京 100075
  • 收稿日期:2020-06-05 修回日期:2020-11-03 出版日期:2021-01-05 发布日期:2021-01-11
  • 作者简介:沈弘(1995—),男,博士研究生,从事先进输变电装备电磁兼容技术的研究,E-mail:shenhong1995@outlook.com;齐磊(1978—),男,通信作者,博士,教授,从事大容量柔性输电装备研制及电磁特性研究,E-mail:qilei_ncepu@126.com
  • 基金资助:
    国家电网公司科技项目(±500 kV柔直工程电磁环境及特殊设备性能检测与评估技术研究,52010118001P)

Experimental Modeling of Forward Recovery Characteristics of IGBT for DC Circuit Breaker

SHEN Hong1, TONG Cuizhi1, DONGYE Zhonghao1, QI Lei1, WANG Qian2   

  1. 1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;
    2. State Grid Beijing Electric Power Research Institute, Beijing 100075, China
  • Received:2020-06-05 Revised:2020-11-03 Online:2021-01-05 Published:2021-01-11
  • Supported by:
    This work is supported by Science and Technology Project of SGCC (Research on Electromagnetic Environment and Special Equipment Performance Testing and Evaluation Technology of ±500 kV VSC-HVDC Project, No.52010118001P).

摘要: 直流断路器是柔性直流电网故障清除的主流手段。混合式直流断路器动作前,转移支路IGBT处在正栅极电压的零电压零电流状态,当转移支路电流开始上升时,由IGBT正向恢复过程产生的集-射极电压过冲一旦满足IGBT过流监测判据,将会引起保护误动进而降低装备运行可靠性。针对直流断路器工况下IGBT出现的正向恢复现象,通过建立的IGBT大电流开通实验平台获取了不同电流上升过程中IGBT集-射极电压波形,基于分阶段数学表征建立了能够反映IGBT正向恢复特性的I-U映射关系。与实测结果相比,该模型计算所得的集-射极电压峰值相对误差小于10%,高于过流监测阈值电压的持续时间相对误差小于15%,可支撑直流断路器所用IGBT的过流监测判据的合理制定。

关键词: 直流断路器, 正向恢复, 行为模型, IGBT, 过流监测

Abstract: DC circuit breaker is the main means to clear the faults in VSC-HVDC power grid. Before action of the hybrid DC circuit breaker, the IGBT in the transfer branch is in a state of zero voltage and zero current. When the current of the transfer branch begins to rise, and once the voltage overshoot of collector-emitter produced in the forward recovery process of IGBT meets the IGBT's over-current monitoring criterion, the protection will malfunction, consequently reducing the operating reliability. Aiming at the forward recovery phenomenon of IGBT, a high-current turn-on experimental platform of IGBT is built to obtain the IGBT’s collector-emitter voltage waveforms corresponding to different current waveforms. Based on the staged mathematical fitting, an I-U mapping relationship that reflects the forward recovery characteristics of the IGBT is established. Compared with the experimental results, the relative error of peak collector-emitter voltage is less than 10%, and the duration relative error of over-current monitoring threshold voltage is less than 15%. The model can help to reasonably formulate the over-current monitoring criterion of IGBT used in DC circuit breaker.

Key words: DC circuit breaker, forward recovery, behavioral model, IGBT, over-current monitoring