Multifunctional Control Strategy for Asymmetrical Cascaded H-Bridge Inverter in Microgrid Applications

Ali Mortezaei, Marcelo Godoy Simoes, Abdullah S. Bubshait, Tiago Davi Curi Busarello, Fernando P. Marafao, Ahmed Al-Durra

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

A multifunctional control strategy for a single-phase asymmetrical cascaded H-bridge multilevel inverter (ACHMI), suitable for microgrid systems with nonlinear loads, is presented. The primary advantage of ACHMI is to produce a staircase output voltage with low harmonic content utilizing unequal dc voltages on the individual H-bridge cells. In a grid-connected mode of operation, the control strategy of the ACHMI is based on the conservative power theory, providing selective disturbing current compensation besides injecting its available energy. In autonomous mode of operation, two different control methods along with a damping resistor in the filter circuit are developed for regulation of the ACHMI instantaneous output voltage in a variety of load conditions. The first method is a single-loop voltage control scheme without the need of any current measurement. The second one is a multiloop voltage control scheme with a load current feedforward compensation strategy and preservation of the grid-connected current control scheme. The steady-state response and stability of both voltage control schemes are analyzed, and based on the application requirement, the control schemes are implemented individually. The effectiveness of each control strategy is experimentally verified using a hardware-in-the-loop setup with the control algorithm implemented in the TMSF28335 DSP microcontroller.

Original languageBritish English
Article number7740840
Pages (from-to)1538-1551
Number of pages14
JournalIEEE Transactions on Industry Applications
Volume53
Issue number2
DOIs
StatePublished - 1 Mar 2017

Keywords

  • Conservative power theory (CPT)
  • distributed generation (DG)
  • microgrid
  • multilevel inverter
  • power quality improvement

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