Voltage Ride through Control Strategy of Modular Multilevel Converter under Unbalanced Voltage Sag

Seyed Mehdi Hakimi, Amin Hajizadeh

Research output: Contribution to journalJournal articleResearchpeer-review

30 Downloads (Pure)

Abstract

This paper develops modeling and describes a control strategy for a modular multilevel converter (MMC) for grid-connected renewable energy systems. The proposed model can be used to simulate MMC activity during normal and faulty situations. Firstly, a dynamic model of a grid-connected MMC (GC-MMC), based upon the symmetrical component of voltages and currents, was designed. Then an adaptive robust control approach was established in order to follow the reference currents of the converter and stabilize the submodule (SM) capacitor voltage. The positive and negative sequences of reference currents that were given from the demanded active and reactive power during grid voltage disturbance and a normal situation were then utilized in control loops. Finally, the numerical results for the performance of the MMC throughout voltage sag conditions and the effect of uncertainties on the filter parameters during changing power demands were evaluated. The results specified that the current control strategy is more potent under voltage sag situations and able to fulfill the stability requirements of the MMC.
Original languageEnglish
Article number551
JournalApplied Sciences
Volume9
Issue number3
Number of pages12
DOIs
Publication statusPublished - 7 Feb 2019

Keywords

  • Control
  • Modeling
  • MMC
  • Unbalanced voltage

Fingerprint Dive into the research topics of 'Voltage Ride through Control Strategy of Modular Multilevel Converter under Unbalanced Voltage Sag'. Together they form a unique fingerprint.

Cite this