A simplified algorithm to solve optimal power flows in hybrid VSC-based AC/DC systems

Javier Renedo, Ahmad Asrul Ibrahim, Behzad Kazemtabrizi, Aurelio García-Cerrada, Luis Rouco, Quanyu Zhao, Javier García-González

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

High Voltage Direct Current systems based on Voltage Source Converters (VSC-HVDC) are increasingly being considered as a viable technology with advantages, above all when using underground or submarine cables, for bulk power transmission. In order to fully understand how VSC-HVDC systems can be best used within existing power systems, it is necessary to adapt conventional tools to carry out system-wide studies including this technology. Along this line, this paper proposes a simplified algorithm to solve optimal power flows (OPFs) in hybrid VSC-based Alternating Current/Direct Current (AC/DC) grids with multi-terminal VSC-HVDC systems. The proposed algorithm makes it possible to seamlessly extend a previous large-scale AC case to which several multi-terminal VSC-HVDC systems must be added. The proposed approach combines two ideas used previously in two different modelling approaches: each VSC is modelled as two generators with a coupling constraint; and DC grids are modelled as notional AC grids, since, in per unit, the equations for the former are a particular case of the latter with resistive lines and no reactive-power injections. In the proposed approach, the hybrid VSC-based AC/DC system is transformed into an equivalent only-AC system. Therefore, the OPF solution of the AC/DC system can be found with the same tool used for the previous AC problem and a simple extension of the original case.

Original languageEnglish
Pages (from-to)781-794
Number of pages14
JournalInternational Journal of Electrical Power and Energy Systems
Volume110
DOIs
Publication statusPublished - 1 Sep 2019

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Underground cables
Submarine cables
Electric potential
Reactive power
Power transmission

Keywords

  • HVDC transmission
  • Multi-terminal
  • Optimal power flow
  • Power systems
  • VSC HVDC

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

A simplified algorithm to solve optimal power flows in hybrid VSC-based AC/DC systems. / Renedo, Javier; Ibrahim, Ahmad Asrul; Kazemtabrizi, Behzad; García-Cerrada, Aurelio; Rouco, Luis; Zhao, Quanyu; García-González, Javier.

In: International Journal of Electrical Power and Energy Systems, Vol. 110, 01.09.2019, p. 781-794.

Research output: Contribution to journalArticle

Renedo, Javier ; Ibrahim, Ahmad Asrul ; Kazemtabrizi, Behzad ; García-Cerrada, Aurelio ; Rouco, Luis ; Zhao, Quanyu ; García-González, Javier. / A simplified algorithm to solve optimal power flows in hybrid VSC-based AC/DC systems. In: International Journal of Electrical Power and Energy Systems. 2019 ; Vol. 110. pp. 781-794.
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