Centralised busbar differential and wavelet-based line protection system for multi- terminal direct current grids, with practical IEC-61869-compliant measurements

Dimitrios Tzelepis, Adam Dyśko, Steven M. Blair, Anastasios Rousis, Sohrab Mirsaeidi, Campbell Booth, Xinzhou Dong

Research output: Contribution to journalArticle

8 Citations (Scopus)
70 Downloads (Pure)

Abstract

This paper presents a method for discriminative detection of DC faults on VSC-powered multi-terminal HVDC transmission systems using two fundamental guiding principles, namely instantaneous current-differential and travelling waves. The proposed algorithm utilises local voltage and current measurements from all transmission lines connected to a DC busbar, and current measurement from the DC side of the converter. The scheme operates at a sampling frequency of 96 kHz which conforms with IEC 61869-9. No long distance communication is involved while measurements and signal exchange within DC substations are enabled by the utilisation of IEC 61850. Performance is assessed firstly through detailed transient simulation, using verified models of modular multi-level converters, hybrid DC circuit breakers and inductive DC-line terminations. Furthermore, practical performance and feasibility of the scheme is evaluated through laboratory testing, using the real time Opal-RT hardware prototyping platform. Simulation and experimental results demonstrate that the proposed protection algorithm can effectively, and within a very short period of time (i.e. less than 1 ms), discriminate between busbar and line faults (internal faults), while remaining stable during external faults. Additionally, it has been demonstrated that IEC 61869-9 is suitable for enabling fast DC protection schemes incorporating travelling waves.
Original languageEnglish
Pages (from-to)3578-3586
Number of pages11
JournalIET Generation, Transmission and Distribution
Volume12
Issue number4
Early online date18 May 2018
DOIs
Publication statusPublished - 13 Aug 2018

Keywords

  • DC faults
  • multi-level converters
  • hybrid DC breaker
  • DC-line terminations
  • travelling waves
  • DC protection scheme

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