Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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27-Level asymmetric multilevel inverter for photovoltaic energy conversion

  • Aliaga, Rodrigo (Department of Electrical Engineering, Universidad de Talca) ;
  • Rojas, Diego (Department of Electrical Engineering, Universidad de Talca) ;
  • Munoz, Javier (Department of Electrical Engineering, Universidad de Talca) ;
  • Villalon, Ariel (Department of Electrical Engineering, Universidad de Talca)
  • Received : 2019.12.26
  • Accepted : 2020.03.30
  • Published : 2020.07.20
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Abstract

This paper presents a novel structure to inject the electric energy from photovoltaic modules to the grid based on a 27-level asymmetric multilevel inverter. This work proposes mixing existing approaches based on string and central inverters to implement a hybrid structure that generates highly sinusoidal waveforms. Indeed, the presented structure allows for a staircase AC voltage waveform with a low level of harmonic distortion, which is a key feature for photovoltaic energy conversion. The proposal is supported with theoretical analyses that include system modeling and a suitable control strategy to track both the active and reactive power. A low power proof-of-concept prototype was built to validate the properness of the proposal. Several dynamic tests were performed, such as severe load impacts, partial shading and fault ride-through capability.

Keywords

Acknowledgement

Authors would like to thank the financial support provided by the Chilean Government under Project ANID/FONDECYT 1191028.

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