中国电力 ›› 2022, Vol. 55 ›› Issue (9): 70-78.DOI: 10.11930/j.issn.1004-9649.202201098

• 电网 • 上一篇    下一篇

基于可变合闸角的变压器励磁涌流抑制方法

李海涛1, 刘北阳2, 滕文涛2, 李宽3, 刘东超1, 须雷1   

  1. 1. 南京南瑞继保电气有限公司,江苏 南京 211102;
    2. 中国电力科学研究院有限公司,北京 100192;
    3. 国网山东省电力公司电力科学研究院,山东 济南 250003
  • 收稿日期:2022-01-27 修回日期:2022-06-10 发布日期:2022-09-20
  • 作者简介:李海涛(1984—),男,高级工程师,从事智能变电站技术、断路器选相控制及一次设备在线监测研究,E-mail:liht@nrec.com
  • 基金资助:
    国家电网有限公司科技项目(特高压变压器选相投切技术、控制装置及系统应用研究,SGSDDKOOWJJS1800100)。

Research on Inrush Current Suppression of Transformer Based on Changeable Closing Angle

LI Haitao1, LIU Beiyang2, TENG Wentao2, LI Kuan3, LIU Dongchao1, XU Lei1   

  1. 1. NR Electric Co., Ltd., Nanjing 211102, China;
    2. China Electric Power Research Institute, Beijing 100192, China;
    3. State Grid Shandong Electric Power Research Institute, Jinan 250003, China
  • Received:2022-01-27 Revised:2022-06-10 Published:2022-09-20
  • Supported by:
    This work is supported by Science and Technology Project of SGCC (Research on Controlled Switching Technology, Device and System Application for UHV Transformer, No.SGSDDKOOWJJS1800100).

摘要: 变压器空载合闸励磁涌流可能引发电网安全问题,采用固定峰值选相合闸抑制励磁涌流的技术尚有提升空间。提出一种基于可变合闸角的励磁涌流抑制方法及控制策略,采用主变压器高压侧或低压侧的电压互感器测算剩磁,并根据剩磁情况调整目标合闸角,阐明了影响剩磁的关键因素及目标合闸角优选原则。试制了装置样机并通过动模仿真及开关带电试验验证了该方法的有效性,为工程实用化提供参考。

关键词: 变压器, 励磁涌流, 选相投切, 控制策略, 合闸电阻, 剩磁

Abstract: The transformer no-load closing inrush current may cause safety problems in power grid, and the controlled switching technology with fixed target angle still has room for improvement in suppressing inrush current. A transformer inrush current suppression method and controlled-switching strategy are thus proposed based on changeable closing angle. The high voltage side PT or low voltage side PT of transformer is used to calculate the residual flux, and the target closing angle is adjusted according to residual flux. The key factors influencing the residual flux are determined, and the principles for choosing the target closing angle are proposed. A device prototype is developed and its effectiveness is verified through dynamic simulation and test station, which can provide reference for its engineering application.

Key words: transformer, inrush current, controlled switching, controlled-switching strategy, closing resistor, residual flux