Decentralized Supplementary Control of Multiple LCC-HVDC Links

Sahar Pirooz Azad, Joshua Adam Taylor, Reza Iravani

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


This paper presents a decentralized wide-area coordinated supplementary control of multiple line-commutated converter (LCC)-HVDC links to 1) prevent interactions among the HVDC links and 2) enhance the damping of the inter-area oscillatory modes. The proposed approach is based on the sparsity-promoting optimal control. The main features of the proposed approach are 1) it requires minimal communication infrastructure to achieve the control objectives and thus reduces the impacts of communication delays and noise, 2) it entails in an optimal gain which preserves the closed-loop stability and 3) it does not require the estimates of the system states. The performance of the proposed controller is evaluated based on eigen analysis and time-domain simulation of an interconnected AC system that includes five LCC-HVDC links. Performance of the proposed controller is also compared with those of fully centralized and conventional local supplementary controllers and its merits are highlighted. The studies indicate the proposed controller, based on 13 remotely communicated signals, provides similar performance as that of a fully centralized optimal controller using 2050 communicated signals and is far superior to the conventional local supplementary controllers.

Original languageEnglish (US)
Article number7024954
Pages (from-to)572-580
Number of pages9
JournalIEEE Transactions on Power Systems
Issue number1
StatePublished - Jan 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


  • Decentralized control
  • high voltage direct current (HVDC)
  • inter-area oscillations
  • sparsity


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