A fault identification method for HVDC transmission lines based on transient measured-impedance

作者：Liu, Jian^*; Tai, Nengling; Fan, Chunju; Chen, Shi; Chen, Jinxiang

来源：Proceedings of the CSEE, 2016, 36(20): 5504-5514.

DOI：10.13334/j.0258-8013.pcsee.152697

• Fault identifications
• Fault resistances
• HVDC
• Measured impedance
• System parameter
• Transient voltage

In order to improve the accuracy of fault detection for HVDC transmission lines, a fault identification method was proposed. Based on the transmission equation of long line, the transient measured-impedance, which is defined as the ratio of transient voltage component and transient current component, was analyzed in detail. The transient measured- impedances at the both sides of DC line are quite different during the internal and external faults due to the different impedance paths provided by the DC line boundary to the transient component with different frequency. This difference is used for fault identification. By employing this method, the shortcomings of traditional protection principles using transient harmonics, such as low amplitude, sensitive to fault resistance and line attenuation, are overcome. The coupling coefficient between the bipolar lines for low-frequency transient component is small. Therefore, the faulted pole selection can be achieved by using the ratio of low-frequency transient component of the bipolar lines. The results of simulation and the test with field data show that the proposed fault identification method is able to identify internal faults with high fault resistance from external faults reliably. In addition, the proposed method is suitable for the situations when the system parameters vary with large range.

• 出版日期2016
• 单位上海交通大学