A fault location criterion for MTDC transmission lines using transient current characteristics |
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| Affiliation: | 1. Department of Electrical Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, PR China;2. Huzhou Power Supply Company of State Grid Zhejiang Electric Power Company, Huzhou, Zhejiang 313000, PR China;3. Zhejiang Electrical Power Corporation, Hangzhou, Zhejiang 310007, PR China;1. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, Zhejiang Province, China;2. China Electric Power Research Institute, Haidian District, Beijing 100192, China;1. Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education, Shandong University, Jinan 250061, China;2. Shandong Xunfengdianzi Co. Ltd., Jinan 250200, China;1. School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China;3. Wenzhou Power Supply Company, Zhejiang Electric Power Company of State Grid, 325000, China;4. Technische Universität Berlin, Berlin 10623, Germany;5. Key Laboratory of Power System Intelligent Dispatch and Control, Shandong University, Jinan 250061, China;6. School of Electrical Engineering, Jiaozuo University, Jiaozuo 454000, China;1. Department of Electrical and Electronic Engineering, University of Bath, Bath, UK;2. Department of Electrical and Computer Engineering, São Carlos School of Engineering, University of São Paulo, São Carlos, Brazil;1. Department of Electrical Engineering, School of Automation, Guangdong University of Technology, Guangzhou 510006, China;2. Brunel Interdisciplinary Power Systems Research Centre, Department of Electronic and Electrical Engineering, Brunel University London, London UB8 3PH, UK |
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| Abstract: | Multi-terminal DC (MTDC) transmission system is applied in modern power systems due to its technical features. In an MTDC system, the converter stations are generally connected in parallel. To smooth the DC current output from the converter, the smoothing reactors are integrated in the converter outputs, instead of in the DC transmission line. When a fault occurs on the DC transmission line of the MTDC system, the fault current will flow along the whole DC line. As a result, the protection scheme may not locate the fault accurately. Based on the characteristics of DC filter, this paper analyzes the impedance characteristics of the combinational circuits, and proposes a method to identify the fault location by the characteristic harmonic. A protection criterion of the non-integer harmonics comparison is composed with phase-frequency characteristics curve derived from complex wavelet transform. The inevitable blind zone is analyzed in theory which exists on the terminal of transmission lines just like distance protection in AC systems. The algorithm is successfully tested and compared with other techniques. |
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| Keywords: | MTDC Transmission line DC filter Fault location Protection Complex wavelet algorithm |
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