Design, Control, and Analysis of a Novel Grid-Interfaced Switched-Boost Dual T-Type Five-Level Inverter With Common-Ground Concept

Reza Barzegarkhoo, Sze Sing Lee, Yam Prasad Siwakoti, Shakil Ahmad Shakar, Frede Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

16 Citations (Scopus)
30 Downloads (Pure)

Abstract

Multilevel inverters with a common-ground structure and voltage step-up feature are beneficial for transformerless grid-connected photovoltaic applications. In this article, a novel topology of such converters with a five-level output voltage generation is presented. The proposed topology comprises of an integrated switched-boost (SB) module and a dual T-type (D2T) cell constructed with 10 power switches (six unidirectional and two bidirectional). An inductor in the integrated SB module is used to boost the voltage across two involved capacitors of the D2T cell. Therefore, a desirable ac voltage magnitude for the grid-connected application can be achieved over a wide range of input voltage changes. Current stress is also kept within a permissible input current range by the soft-charging operation of the involved capacitors through the inductor. A corresponding dead-beat continuous-current-control-set controller with a sinusoidal PWM modulator is implemented for controlling the real and reactive powers. The controller has an added benefit of achieving constant switching frequency for power switches. Circuit description, theoretical analyses, and comparative study are discussed. Simulation and experimental results are also presented to confirm the feasibility and correctness of the proposed topology.

Original languageEnglish
Article number9177286
JournalI E E E Transactions on Industrial Electronics
Volume68
Issue number9
Pages (from-to)8193 - 8206
Number of pages14
ISSN0278-0046
DOIs
Publication statusPublished - Sep 2021

Keywords

  • Common-grounded (CG)
  • soft charging operation
  • switched-boost (SB) module
  • transformerless (TL) inverter

Fingerprint

Dive into the research topics of 'Design, Control, and Analysis of a Novel Grid-Interfaced Switched-Boost Dual T-Type Five-Level Inverter With Common-Ground Concept'. Together they form a unique fingerprint.

Cite this