A novel pilot protection scheme for HVDC transmission line based on current waveform matching

被引：0
|
作者：
Liu, Jian [1 ]
Tai, Nengling [1 ]
Fan, Chunju [1 ]
机构：
[1] School of Electronic Information and Electrical Engineering, Shanghai Jiaotong University, Minhang District,, Shanghai
来源：
Dianwang Jishu/Power System Technology | 2015年 / 39卷 / 06期
基金：
中国国家自然科学基金;
关键词：
DC-filter; HVDC transmission line; Impedance characteristic; Pilot protection; Waveform matching;
D O I：
10.13335/j.1000-3673.pst.2015.06.043
中图分类号：
学科分类号：
摘要：
In this paper a novel pilot protection principle for HVDC transmission lines is proposed based onwaveform characteristics analysis of specific current at both terminals of DC line. The impedance value of DC-filter at specific frequency is found nearly zero with spectrum analysis. Namely, there is no specific frequency current detected by DC shunts during normal operation, while the current will increase significantly when fault occurs due to system impedance change. Equivalent network for DC system at specific frequency is analyzed and it is found that when internal faults occur, the direction of specific current detected at DC line ends is from DC bus to DC line, while the direction of specific current detected at rectifier side is from DC line to DC bus and direction of specific current detected at inverter side is from DC bus to DC line during external faults at rectifier side. The situation of external fault at inverter side is opposite to that of faults at inverter side. The direction difference of specific current at DC line ends leads to significant difference in waveform matching, which can be used to identify the fault location(external or internal). An improved backup protection scheme for HVDC transmission line is also proposed to overcome the shortage of the existing current differential protection. Simulation results show that the proposed protection scheme can identify internal and external faults reliably, and owns ability to respond to faults with high transition resistance. ©, 2015, Power System Technology Press. All right reserved.
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页码：1736 / 1743
页数：7
相关论文
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