利用峰值频率的高压直流输电线路纵联保护方案
发布时间：2018-10-16 17:58
【摘要】：根据高压直流输电线路两端直流滤波器和换流器的阻抗频率特性,提出一种基于直流滤波器峰值频率的纵联保护方案。峰值频率下,直流滤波器近似为开路,换流器直流等值阻抗近似表现为感性元件。以此为基础,对直流输电线路进行区内外故障分析发现,区内故障时,整流侧、逆变侧峰值频点阻抗阻抗角均为-90°;区外故障时,故障侧峰值频点阻抗阻抗角为90°,对侧峰值频点阻抗阻抗角仍为-90°。根据此特征构造出区内外故障识别判据。针对利用单端故障信号选极可靠性差的弱点,进一步提出了含权重系数的双端选极判据。仿真结果表明,该方案原理简单、方法可靠、抗过渡电阻能力强且不受分布电容电流的影响。
[Abstract]:According to the impedance frequency characteristics of DC filters and converters at both ends of HVDC transmission lines, a longitudinal protection scheme based on the peak frequency of DC filters is proposed. At the peak frequency, the DC filter is approximately open circuit, and the DC equivalent impedance of the converter is approximately the inductive element. On the basis of this, the fault analysis inside and outside the area of HVDC transmission line shows that the peak impedance angle of rectifier side and inverter side is -90 掳when the fault is in the region, and when the fault is outside the area, the impedance angle of peak frequency point of rectifier side and inverter side is -90 掳. The impedance angle of the peak frequency point of fault side is 90 掳, and the impedance angle of the opposite peak frequency point is still -90 掳. According to this feature, a fault identification criterion within and outside the region is constructed. Aiming at the weakness of poor reliability of single terminal fault signal selection, the criterion of double terminal pole selection with weight coefficient is proposed. The simulation results show that the scheme is simple in principle, reliable in method, strong in resistance to transition resistance and independent of distributed capacitance current.
【作者单位】： 上海交通大学电子信息与电气工程学院;国网上海市电力公司电力科学研究院;国网福建省电力有限公司电力科学研究院;
【基金】：国家自然科学基金项目(51377104,51407115) 中国博士后科学基金资助项目(2014M560333)~~
【分类号】：TM75;TM773
本文编号：2275183
[Abstract]:According to the impedance frequency characteristics of DC filters and converters at both ends of HVDC transmission lines, a longitudinal protection scheme based on the peak frequency of DC filters is proposed. At the peak frequency, the DC filter is approximately open circuit, and the DC equivalent impedance of the converter is approximately the inductive element. On the basis of this, the fault analysis inside and outside the area of HVDC transmission line shows that the peak impedance angle of rectifier side and inverter side is -90 掳when the fault is in the region, and when the fault is outside the area, the impedance angle of peak frequency point of rectifier side and inverter side is -90 掳. The impedance angle of the peak frequency point of fault side is 90 掳, and the impedance angle of the opposite peak frequency point is still -90 掳. According to this feature, a fault identification criterion within and outside the region is constructed. Aiming at the weakness of poor reliability of single terminal fault signal selection, the criterion of double terminal pole selection with weight coefficient is proposed. The simulation results show that the scheme is simple in principle, reliable in method, strong in resistance to transition resistance and independent of distributed capacitance current.
【作者单位】： 上海交通大学电子信息与电气工程学院;国网上海市电力公司电力科学研究院;国网福建省电力有限公司电力科学研究院;
【基金】：国家自然科学基金项目(51377104,51407115) 中国博士后科学基金资助项目(2014M560333)~~
【分类号】：TM75;TM773
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