Advanced vector control for voltage source converters connected to weak grids

Agusti Egea-Alvarez, Sajjad Fekriasl, Fainan Hassan, Oriol Gomis-Bellmunt

Research output: Contribution to journalArticle

129 Citations (Scopus)

Abstract

This paper addresses an advanced vector current control for a voltage source converter (VSC) connected to a weak grid. The proposed control methodology permits high-performance regulation of the active power and the voltage for the feasible VSC range of operation. First, the steady state characteristics for a power converter connected to a very weak system with a short circuit ratio (SCR) of 1 are discussed in order to identify the system limits. Then, the conventional vector control (inner loop) and the conventional power/voltage control (outer loop) stability and frequency responses are analyzed. From the analysis of the classic structure, an enhanced outer loop based on a decoupled and gain-scheduling controller is presented and its stability is analyzed. The proposed control is validated by means of dynamic simulations and it is compared with classic vector current control. Simulation results illustrate that the proposed control system could provide a promising approach to tackle the challenging problem of VSC in connection with weak AC grids.
Original languageEnglish
Pages (from-to)3072-3081
Number of pages10
JournalIEEE Transactions on Power Systems
Volume30
Issue number6
Early online date12 Jan 2015
DOIs
Publication statusPublished - 1 Nov 2015

Keywords

  • gain-scheduling control
  • stability
  • vector current control
  • VSC-HVDC
  • weak grid

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