A skewness based method for diagnosis in quasi-Z T-type grid-connected converters

Tito G. Amaral, V. Fernao Pires, Armando Cordeiro, Daniel Foito

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

One of the very interesting converters for transformerless grid-connected PV systems is the multilevel quasi-Z T-Type inverter. Besides their multilevel operation, it presents voltage Boost capability and robustness to instantaneous switching between power semiconductors of the same leg and capability to work in fault tolerant condition. However, to ensure this capability, it is essential to ensure a fast and correct diagnosis of the component under fault. Thus, this paper proposes a new method for the detection of an open switch fault. The proposed approach uses the inverter AC line currents that will be analyzed by a Skewness based method. The method has the capability to distinguish the switch under fault. Besides that, it presents robustness to interferences such as noise, as well is insensible to variations of the injected power into the grid. Several simulation and experimental results will be presented in order to verify the capability of the proposed method. 963478217

Original languageEnglish
Title of host publication8th International Conference on Renewable Energy Research and Applications, ICRERA 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages131-136
Number of pages6
ISBN (Electronic)9781728135878
DOIs
Publication statusPublished - Nov 2019
Event8th International Conference on Renewable Energy Research and Applications, ICRERA 2019 - Brasov, Romania
Duration: 3 Nov 20196 Nov 2019

Conference

Conference8th International Conference on Renewable Energy Research and Applications, ICRERA 2019
CountryRomania
CityBrasov
Period3/11/196/11/19

Keywords

  • Fault detection and diagnosis
  • Grid-connected PV
  • Quasi-Z inverter (qZSI)
  • Skewness
  • T-Type

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