A protection scheme for multi-terminal VSCHVDC transmission systems

Ali Raza, Amin Akhtar, Mohsin Jamil, Ghulam Abbass, Syed Omer Gillani, Liu Yuchao, Muhammad Nasir Khan, Tahir Izhar, Xu Dianguo, Barry W. Williams

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

High voltage direct current (HVDC) power transmission is becoming increasingly important due to steadily rising need for bulk power delivery and interconnected power transmission and distribution systems. DC grids are vulnerable to dc faults, which lead to a rapid rise in dc fault currents. The dc faults must be cleared within timeframe of milliseconds to avoid collapse of the HVDC system. In the event of primary protection (PP) failure, back-up protection (BP) must be applied to clear the fault. In this paper, a novel algorithm based on a Naïve Bayes classifier is proposed to determine threshold levels and operational time frames for primary and back-up protection in multi-terminal voltage source converter based HVDC (VSCHVDC). Local voltage and currents are measured to detect and identify the kind of fault. A four terminal HVDC transmission system is developed in PSCAD/EMTDC and is subjected to lineline faults at different locations and time, to assess the designed protection schemes. Results show that relaying algorithm effectively detects the fault and expedite the primary protection operation. On malfunctioning of PP, BP is accelerated in a short delay of 0.2ms. Furthermore, the relaying algorithm provides faster protection compared to techniques available in the literature. The resulting reduced fault clearance time truncates the maximum fault current and inevitably, leads to reduced power ratings required for dc grid equipment.

LanguageEnglish
Number of pages7
JournalIEEE Access
Early online date25 Dec 2017
DOIs
Publication statusE-pub ahead of print - 25 Dec 2017

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Electric potential
Electric fault currents
DC power transmission
Classifiers

Keywords

  • back-up protection
  • multi-terminal VSC-HVDC
  • protection system
  • primary protection

Cite this

Raza, Ali ; Akhtar, Amin ; Jamil, Mohsin ; Abbass, Ghulam ; Gillani, Syed Omer ; Yuchao, Liu ; Khan, Muhammad Nasir ; Izhar, Tahir ; Dianguo, Xu ; Williams, Barry W. / A protection scheme for multi-terminal VSCHVDC transmission systems. In: IEEE Access. 2017.
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Raza, A, Akhtar, A, Jamil, M, Abbass, G, Gillani, SO, Yuchao, L, Khan, MN, Izhar, T, Dianguo, X & Williams, BW 2017, 'A protection scheme for multi-terminal VSCHVDC transmission systems' IEEE Access. https://doi.org/10.1109/ACCESS.2017.2787485

A protection scheme for multi-terminal VSCHVDC transmission systems. / Raza, Ali; Akhtar, Amin; Jamil, Mohsin; Abbass, Ghulam; Gillani, Syed Omer; Yuchao, Liu; Khan, Muhammad Nasir; Izhar, Tahir; Dianguo, Xu; Williams, Barry W.

In: IEEE Access, 25.12.2017.

Research output: Contribution to journalArticle

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T1 - A protection scheme for multi-terminal VSCHVDC transmission systems

AU - Raza, Ali

AU - Akhtar, Amin

AU - Jamil, Mohsin

AU - Abbass, Ghulam

AU - Gillani, Syed Omer

AU - Yuchao, Liu

AU - Khan, Muhammad Nasir

AU - Izhar, Tahir

AU - Dianguo, Xu

AU - Williams, Barry W.

PY - 2017/12/25

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N2 - High voltage direct current (HVDC) power transmission is becoming increasingly important due to steadily rising need for bulk power delivery and interconnected power transmission and distribution systems. DC grids are vulnerable to dc faults, which lead to a rapid rise in dc fault currents. The dc faults must be cleared within timeframe of milliseconds to avoid collapse of the HVDC system. In the event of primary protection (PP) failure, back-up protection (BP) must be applied to clear the fault. In this paper, a novel algorithm based on a Naïve Bayes classifier is proposed to determine threshold levels and operational time frames for primary and back-up protection in multi-terminal voltage source converter based HVDC (VSCHVDC). Local voltage and currents are measured to detect and identify the kind of fault. A four terminal HVDC transmission system is developed in PSCAD/EMTDC and is subjected to lineline faults at different locations and time, to assess the designed protection schemes. Results show that relaying algorithm effectively detects the fault and expedite the primary protection operation. On malfunctioning of PP, BP is accelerated in a short delay of 0.2ms. Furthermore, the relaying algorithm provides faster protection compared to techniques available in the literature. The resulting reduced fault clearance time truncates the maximum fault current and inevitably, leads to reduced power ratings required for dc grid equipment.

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Raza A, Akhtar A, Jamil M, Abbass G, Gillani SO, Yuchao L et al. A protection scheme for multi-terminal VSCHVDC transmission systems. IEEE Access. 2017 Dec 25. https://doi.org/10.1109/ACCESS.2017.2787485