Application of Short-Time Fourier Transform for Harmonic-Based protection of Meshed VSC-MTDC Grids

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Abstract

This work studies the application of short-time Fourier transform (STFT) to extract current harmonics of various fault types to design a protection method for meshed multi-terminal voltage source converter-high-voltage direct current (VSC-HVDC-MTDC) grids. The frequency spectrum of fault current harmonics is used to detect internal and external faults, the faulty pole and fault type. The method does not need the implementation of series inductance on the sides of the DC lines and it is also effective for lines combining overhead lines and cables. The window function and hop size play the primary role in STFT, which are investigated in a sensitivity analysis. A modified version of CIGRE meshed DC grid system is simulated in PSCAD in order to show the robustness of the method, and further signal processing analysis is done in MATLAB. The results show the accurate detection and discrimination between faulty sections using the proposed harmonic-based method and how important the STFT parameters are in order to have a robust protection algorithm.
Original languageEnglish
JournalThe Journal of Engineering
Volume2019
Issue number16
Pages (from-to)1439-1443
Number of pages5
ISSN2051-3305
DOIs
Publication statusPublished - Mar 2019
Event14th IET International Conference on AC and DC Power Transmission (ACDC 2018) - Chengdu, China
Duration: 28 Jun 201830 Jun 2018

Conference

Conference14th IET International Conference on AC and DC Power Transmission (ACDC 2018)
CountryChina
CityChengdu
Period28/06/201830/06/2018

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