Improved Predictive Control for an Asymmetric Multilevel Converter for Photovoltaic Energy

Patricio Gaisse, Javier Muñoz, Ariel Villalón and Rodrigo Aliaga
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Patricio Gaisse: Engineering Systems Doctoral Program, Faculty of Engineering, University of Talca, Curicó 3344158, Chile
Javier Muñoz: Department of Electrical Engineering, Faculty of Engineering, Universidad de Talca, Curicó 3344158, Chile
Ariel Villalón: Engineering Systems Doctoral Program, Faculty of Engineering, University of Talca, Curicó 3344158, Chile
Rodrigo Aliaga: Engineering Systems Doctoral Program, Faculty of Engineering, University of Talca, Curicó 3344158, Chile

Sustainability, 2020, vol. 12, issue 15, 1-22

Abstract: 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.

Keywords: multilevel converter; predictive control; photovoltaic energy; cascade control (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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