Capacitor Voltage Ripple Reduction Modulation Method for String Photovoltaic Inverters

Mokhtar Aly, Emad M. Ahmed, Samir Kouro, Masahito Shoyama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper proposes a new pulse width modulation (PWM) method for reducing capacitor voltage ripples in H-bridge five-level T-Type inverters for grid-connected single-phase photovoltaic (PV) string inverter applications. The T-Type inverters have been widely employed in several applications due to their superior performance. However, single-phase applications suffer from high voltage ripples over the dc-link capacitors. These ripples cause shortened operating lifetime and reduced reliability of capacitors in addition to distorted output current of the inverter. Thence, a new improved PWM method is developed in this paper for reducing the ripple voltages over the capacitors. The new PWM method employs equally swapped utilization of dc-link capacitors within the line period. In addition, the proposed method is capable of achieving natural voltages balancing among the capacitors. The simulation and experimental verifications of the new proposed PWM have been provided.

Original languageEnglish
Title of host publication2019 21st International Middle East Power Systems Conference, MEPCON 2019 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages852-857
Number of pages6
ISBN (Electronic)9781728152899
DOIs
Publication statusPublished - Dec 2019
Event21st International Middle East Power Systems Conference, MEPCON 2019 - Cairo, Egypt
Duration: Dec 17 2019Dec 19 2019

Publication series

Name2019 21st International Middle East Power Systems Conference, MEPCON 2019 - Proceedings

Conference

Conference21st International Middle East Power Systems Conference, MEPCON 2019
CountryEgypt
CityCairo
Period12/17/1912/19/19

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All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Control and Optimization

Cite this

Aly, M., Ahmed, E. M., Kouro, S., & Shoyama, M. (2019). Capacitor Voltage Ripple Reduction Modulation Method for String Photovoltaic Inverters. In 2019 21st International Middle East Power Systems Conference, MEPCON 2019 - Proceedings (pp. 852-857). [9008065] (2019 21st International Middle East Power Systems Conference, MEPCON 2019 - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/MEPCON47431.2019.9008065