Novel Multilevel Inverters Based on AC-AC Converter for Photovoltaic Applications

Ashraf Ali Khan, Wilson Eberle, Liwei Wang, Usman Ali Khan, Shehab Ahmed, Mohammad Agamy

Research output: Contribution to journalArticlepeer-review

Abstract

A novel family of multilevel inverters consisting of three-level (3L) half-bridge, 3L full-bridge and cascaded modular multilevel inverters for photovoltaic applications is presented in this article. The proposed inverters are based on a buck type ac-ac converter and feature no high-frequency common-mode voltage. They can be isolated from the grid or output load without requiring an external circuitry. The voltage stress of all the high-frequency switches in the proposed half-bridge 3L inverter is half of the input voltage. The proposed cascaded multilevel inverter is highly modular and can reach a high output voltage level using low voltage rating devices. In addition, it offers a unique feature in that a faulty or unnecessary unit can be bypassed without disturbing the circuit operation of the remaining healthy units. The derivation of the proposed inverters, modulation strategies, working principles and common-mode voltage analysis are discussed. A 550 W experimental prototype of the proposed 3L half-bridge inverter and 1.5 kW experimental prototype of the proposed 5L cascaded modular multilevel inverter are constructed and tested. Test results verify the excellent performance of the proposed inverters.
Original languageEnglish (US)
Pages (from-to)1-1
Number of pages1
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
DOIs
StatePublished - 2020

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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