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Open AccessArticle

Improved Predictive Control for an Asymmetric Multilevel Converter for Photovoltaic Energy

by Patricio Gaisse 1,†, Javier Muñoz 2,*,†,‡, Ariel Villalón 1,† and Rodrigo Aliaga 1
Engineering Systems Doctoral Program, Faculty of Engineering, University of Talca, Curicó 3344158, Chile
Department of Electrical Engineering, Faculty of Engineering, Universidad de Talca, Curicó 3344158, Chile
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Current address: Faculty of Engineering, Universidad de Talca, Merced 437, Curicó.
Sustainability 2020, 12(15), 6204;
Received: 7 June 2020 / Revised: 21 July 2020 / Accepted: 23 July 2020 / Published: 1 August 2020
(This article belongs to the Special Issue Photovoltaic Power)
This article proposes a 27-level asymmetric cascade H-bridge multilevel topology for photovoltaic applications, which considers a predictive control strategy that allows minimization of the commutations of the converter. This proposal ensures a highly sinusoidal and stable photovoltaic injection when there are solar irradiance disturbances, generating a low distortion in the current waveform and low switching losses. To validate the performance of the control and the proposed topology, the dynamic model of the alternating current (AC) and direct current (DC) side system is first obtained, which is checked by computational simulations. Subsequently, the implementation of a master–slave control is carried out, focused on the control of DC voltage and AC current. The proposal is simulated, and the total harmonic distortion (THD) is obtained in the voltage and current waveforms. Undesired commutations, typical of the predictive control, are eliminated in the AC voltage waveform, and a proper DC voltage tracking is achieved for the high-power cell. In order to demonstrate the performance of the proposed control strategy, a low-power proof-of-concept prototype is implemented, in which the energy is injected to the grid, under the event of solar irradiance disturbances (with DC control).Then, the undesired switching in the main cell is eliminated, generating THDs in the voltage and current signal of 7.76% and 2.65%, respectively. View Full-Text
Keywords: multilevel converter; predictive control; photovoltaic energy; cascade control multilevel converter; predictive control; photovoltaic energy; cascade control
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MDPI and ACS Style

Gaisse, P.; Muñoz, J.; Villalón, A.; Aliaga, R. Improved Predictive Control for an Asymmetric Multilevel Converter for Photovoltaic Energy. Sustainability 2020, 12, 6204.

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