基于小波变换的HVDC输电系统故障诊断研究
利用PSCAD/EMTDC工具,搭建了完整的高压直流输电系统的电磁暂态模型,对直流输电系统的各种典型故障进行仿真。经小波变换后,提取了多种典型故障信息特征波形。分析了直流线路保护区内与区外故障的暂态电流信号极性和过渡电阻等因素对电流暂态信号极性识别的影响。研究了在双极系统中,故障时两极之间电压耦合关系状态下,由电压变化量来判定故障极。由此提出了一种基于暂态信息的直流输电线路保护判据。仿真结果表明,该保护判据能准确识别故障位置,具有较高的耐过渡电阻能力,并且对通信通道的可靠性要求较低。...
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Published in | 电力系统保护与控制 Vol. 40; no. 3; pp. 100 - 104 |
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Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
山东省电力学校,山东泰安,271000%山东大学电气工程学院,山东济南,250061
2012
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Subjects | |
Online Access | Get full text |
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Summary: | 利用PSCAD/EMTDC工具,搭建了完整的高压直流输电系统的电磁暂态模型,对直流输电系统的各种典型故障进行仿真。经小波变换后,提取了多种典型故障信息特征波形。分析了直流线路保护区内与区外故障的暂态电流信号极性和过渡电阻等因素对电流暂态信号极性识别的影响。研究了在双极系统中,故障时两极之间电压耦合关系状态下,由电压变化量来判定故障极。由此提出了一种基于暂态信息的直流输电线路保护判据。仿真结果表明,该保护判据能准确识别故障位置,具有较高的耐过渡电阻能力,并且对通信通道的可靠性要求较低。 |
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Bibliography: | system fault; line protection; wavelet transform; polarity identification; voltage variation SONG Zhi-ming1, HUO Yong-hong1, XUN Tang-sheng1,WANG Li1, GAO Zhan-jun2, CONG Wei2, CUI Hao1, FU Zhao-yuan2 (1. Shandong Electric Power School, Taian 271000, China; 2. School of Electrical Engineering, Shandong University, Jinan 250061, China) 41-1401/TM A complete electromagnetic transient model of HVDC (High Voltage Direct Current) system is built on the basis of PSCAD/EMTDC. A lot of typical faults for HVDC transmission system are simulated in the model. A large amount of typical fault information is extracted with the method of wavelet transform. When the faults occur inside and outside protection section of HVDC system, polarities of transient current and transition resistances affect transient current signal polarity identification, and the effect is analyzed. For two electrodes system, under the state of coupling relationship of voltage, the fault electrode is confirmed by voltage variation. A transient protection |
ISSN: | 1674-3415 |
DOI: | 10.3969/j.issn.1674-3415.2012.03.019 |