基于浮动门槛值的改进电流互感器饱和识别方法研究
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TM452

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国家自然科学基金资助项目(61673213)


An improved method of identifying the CT′s saturation considering line parameters
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National Natural Science Foundation of China(61673213)

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    摘要:

    线路纵联通道中传统电流互感器(CT)与电子式电流互感器(ECT)混用时,CT饱和可能导致线路差动保护不正确动作。目前虚拟制动电流法是解决这一问题的常用方法,但虚拟制动电流法开放差动保护门槛值固定,并未考虑线路参数变化对其的影响,使得开放差动保护时间较长。针对这一问题,文中在虚拟制动电流法基础上,提出了一种基于浮动门槛值的改进方法。通过对CT进行建模,获取线路参数与饱和程度关系,计算出浮动门槛值参考曲线,并根据具体线路参数自适应选取门槛值,以确保差动保护不误动,同时缩短差动保护闭锁时间。仿真表明,该方法能够有效提高灵敏性,减小差动闭锁时间,并具有较大的适用范围。

    Abstract:

    The mixing of magnetic and electronic CTs in transmission line might affect the correction of line differential protection′s action. Recently, the virtual braking current method is the common way to solve that problem. While the virtual braking current method is fixed to the threshold value of the differential protection, and the influence of the variation of the line parameters is not considered, therefore the opening time of differential protection takes too long. Aiming to this, it proposes an improved method to identify saturation in this paper, which is based on floating threshold value. Firstly, it calculates the line parameters and floating threshold value of the reference curve by the establishment of the model of current transformer which obtains line parameter and relationship of saturation degree. Secondly, the threshold value is chosen adaptively according to the specific line parameters to ensure the differential protection disoperation, as well as reducing the locking time of differential protection. The simulation results show that the method can enhance the sensitivity, reduce the shutting time of differential protection and can apply to a large scale.

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张凌浩,刘建坤,卜京.基于浮动门槛值的改进电流互感器饱和识别方法研究[J].电力工程技术,2019,38(3):115-120

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历史
  • 收稿日期:2018-12-07
  • 最后修改日期:2019-01-14
  • 录用日期:2019-01-14
  • 在线发布日期: 2019-06-03
  • 出版日期: 2019-05-28