Enhanced low-voltage ride-through capability of flying capacitors inverter using model predictive control

Mohamed Trabelsi, Lazhar Ben-Brahim, Adel Gastli, Haitham Abu-Rub

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This paper proposes an enhancement of the low-voltage ride-through (LVRT) capability of multilevel flying capacitors inverter using an improved model predictive control (MPC). The proposed solution is a multiobjective control strategy ensuring simultaneous capacitors' voltages balancing and grid current injection with reduced total harmonics distortion (THD) and unity power factor even under severe voltage sags. The proposed MPC technique makes use of a multioptimization solution for the common problem of weight dissimilarity of the control objectives. The first optimization is achieved by the inclusion of the state variables normalization within the cost function computation. This will provide to the proposed MPC technique more robustness with the ability to take into consideration external disturbances (grid voltage sag) while ensuring the meeting of the state variables constraints. The second one is achieved through accurately tuning the weighting factor based on minimizing the grid current total harmonics distortion and the maximal errors on the capacitors' voltages. Theoretical analysis and simulation results are presented to prove that the presented solution guarantees continuous and smooth power transfer to the grid even under severe voltage sags. The obtained results are validated on a 1-kW experimental prototype.

Original languageEnglish
Article numbere2430
JournalInternational Transactions on Electrical Energy Systems
Volume27
Issue number12
DOIs
Publication statusPublished - 1 Dec 2017

Fingerprint

Low Voltage
Model predictive control
Model Predictive Control
Inverter
Voltage Sag
Capacitor
Capacitors
Grid
Electric potential
Harmonic
Voltage
Harmonic distortion
Dissimilarity
Balancing
Normalization
Weighting
Cost Function
Control Strategy
Injection
Tuning

Keywords

  • flying capacitors inverter
  • grid connection
  • low THD
  • model predictive controller
  • voltage ride through
  • VRT

ASJC Scopus subject areas

  • Modelling and Simulation
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Enhanced low-voltage ride-through capability of flying capacitors inverter using model predictive control. / Trabelsi, Mohamed; Ben-Brahim, Lazhar; Gastli, Adel; Abu-Rub, Haitham.

In: International Transactions on Electrical Energy Systems, Vol. 27, No. 12, e2430, 01.12.2017.

Research output: Contribution to journalArticle

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