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| Research on an improved double-terminal traveling wave fault location method for UHVDC project |
| DOI：10.19783/j.cnki.pspc.191050 |
| Key Words:UHVDC system line fault location double-end traveling wave method wavelet analysis travel wave velocity |
| Author Name | Affiliation | | SUN Guang | 1. State Grid East Inner Mongolia Electric Power Maintenance Company, Tongliao 028000, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | WANG Yang | 1. State Grid East Inner Mongolia Electric Power Maintenance Company, Tongliao 028000, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | XUE Feng | 1. State Grid East Inner Mongolia Electric Power Maintenance Company, Tongliao 028000, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | LI Mengke | 1. State Grid East Inner Mongolia Electric Power Maintenance Company, Tongliao 028000, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | DONG Jinxing | 1. State Grid East Inner Mongolia Electric Power Maintenance Company, Tongliao 028000, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | LIANG Wei | 1. State Grid East Inner Mongolia Electric Power Maintenance Company, Tongliao 028000, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | LE Jian | 1. State Grid East Inner Mongolia Electric Power Maintenance Company, Tongliao 028000, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China |
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| Abstract:Accurate transmission line fault location is of great practical significance for improving the efficiency of fault treatment and guaranteeing the reliability of a UHVDC system. A fault location strategy for a DC transmission line based on an improved D-type twin-terminal traveling wave method is designed. First, the derivative method is adopted to accurately judge the range of fault occurrence time. Then, the exact time when the traveling wave reaches both ends of the line is determined by wavelet modulus maximum analysis. Based on the first and second moments when the fault traveling wave reaches the measuring end, an improved D-type two-terminal traveling wave ranging method is designed. It eliminates the influence of traveling wave velocity on fault ranging. The simulation results show that the error of fault ranging is small. It indicates that the improved D-type two-terminal traveling wave method has higher fault location accuracy. At the same time, it has good adaptability to different types of faults and different transition resistances, and can also be applied to the location of near-area faults.
This work is supported by National Natural Science Foundation of China (No. 51477120). |
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