Non‐unit travelling wave protection method for dc transmission line using waveform correlation calculation. Issue 12 (17th April 2020)

• Record Type: Journal Article
• Authors: Zhang, Chenhao; Song, Guobing; Yang, Liming; Dong, Xinzhou
• Is Part Of: IET generation, transmission & distribution. Volume 14:Issue 12(2020)
• Page Start: 2263
• Page End: 2270
• Publication Date: 2020-04-17
• Subjects: power transmission protection -- fault location -- power grids -- relay protection -- power transmission faults -- fault diagnosis -- HVDC power transmission -- power transmission lines -- HVDC power convertors; waveform correlation calculation -- high‐speed operation -- relay protection -- nonunit travelling wave‐based protection methods -- fault impedance -- low protection sensitivity -- high‐impedance fault -- fault information -- fault travelling wavefront -- dc transmission line -- fault‐point initial travelling wave -- fault distance -- thyristor‐based HVDC -- VSC HVDC PSCAD test systems -- high fault‐impedance tolerability -- nonunit travelling wave protection method; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2019.0455
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : High voltage dc (HVDC) transmission, especially voltage source converter (VSC)‐based HVDC transmission requires high‐speed operation for relay protection. However, traditional derivative‐based non‐unit travelling wave‐based protection (TWP) methods are sensitive to the fault impedance, resulting in low protection sensitivity in case of the high‐impedance fault. First, the fault information containing in the fault travelling wavefront is analysed based on the frequency‐dependent parameters of the dc transmission line and the broadband characteristic of the fault‐point initial travelling wave. It can be concluded that the distortion of the fault travelling wavefront depends on the fault distance and the amplitude of the fault travelling wavefront depends on the fault impedance. Then, a principle of non‐unit TWP for dc transmission line based on waveform correlation calculation is proposed. The proposed method is verified in both thyristor‐based HVDC and VSC HVDC PSCAD test systems. The simulation results verify the high‐speed, high fault‐impedance tolerability and correctness of the proposed protection method.