University of Hertfordshire

  • Mokhtar Benasla
  • Tayeb Allaoui
  • Mostefa Brahami
  • Vijay Sood
  • Mouloud Denai
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Original languageEnglish
Number of pages11
Pages (from-to)228-238
JournalElectric Power Systems Research
Journal publication date1 Mar 2019
Volume168
Early online date19 Dec 2018
DOIs
Publication statusE-pub ahead of print - 19 Dec 2018

Abstract

In recent years, guaranteeing that large-scale interconnected systems operate safely, stably and economically has become a major and emergency issue. A number of high profile blackouts caused by cascading outages have focused attention on this issue. Embedded HVDC (High Voltage Direct Current) links within a larger AC power system are known to act as a “firewall” against cascading disturbances and therefore, can effectively contribute in preventing blackouts. A good example is the 2003 blackout in USA and Canada, where the Québec grid was not affected due to its HVDC interconnection. In the literature, many works have studied the impact of HVDC on the power system stability, but very few examples exist in the area of its impact on the system security. This paper presents a control strategy for HVDC systems to increase their contribution to system security. A real-time closed-loop control scheme is used to modulate the DC power of HVDC links to alleviate AC system overloads and improve system security. Simulations carried out on a simplified model of the Hydro-Québec network show that the proposed method works well and can greatly improve system security during emergency situations.

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