Design of an MPPT Technique for the Indirect Measurement of the Open-Circuit Voltage Applied to Thermoelectric Generators

Ricardo Marroquín-Arreola, Jinmi Lezama, Héctor Ricardo Hernández- De León, Julio César Martínez-Romo, José Antonio Hoyo-Montaño, Jorge Luis Camas-Anzueto, Elías Neftalí Escobar-Gómez, Jorge Evaristo Conde-Díaz, Mario Ponce-Silva and Ildeberto Santos-Ruiz
Additional contact information
Ricardo Marroquín-Arreola: Tecnológico Nacional de México, I.T. de Tuxtla Gutiérrez, Tuxtla Gutiérrez 29050, Chiapas, Mexico
Jinmi Lezama: Universidad Nacional Tecnológica de Lima Sur, Lima C.P. 15834, Peru
Héctor Ricardo Hernández- De León: Tecnológico Nacional de México, I.T. de Tuxtla Gutiérrez, Tuxtla Gutiérrez 29050, Chiapas, Mexico
Julio César Martínez-Romo: Tecnológico Nacional de México, I.T. de Aguascalientes, Aguascalientes 20256, Ags, Mexico
José Antonio Hoyo-Montaño: Tecnológico Nacional de México, I.T. de Hermosillo, Hermosillo 83170, Sonora, Mexico
Jorge Luis Camas-Anzueto: Tecnológico Nacional de México, I.T. de Tuxtla Gutiérrez, Tuxtla Gutiérrez 29050, Chiapas, Mexico
Elías Neftalí Escobar-Gómez: Tecnológico Nacional de México, I.T. de Tuxtla Gutiérrez, Tuxtla Gutiérrez 29050, Chiapas, Mexico
Jorge Evaristo Conde-Díaz: CONACYT-Universidad de Ciencias y Artes de Chiapas, Instituto de Investigación e Innovación en Energías Renovables, Tuxtla Gutiérrez 29039, Chiapas, Mexico
Mario Ponce-Silva: Tecnológico Nacional de México, CENIDET, Cuernavaca 62490, Morelos, Mexico
Ildeberto Santos-Ruiz: Tecnológico Nacional de México, I.T. de Tuxtla Gutiérrez, Tuxtla Gutiérrez 29050, Chiapas, Mexico

Energies, 2022, vol. 15, issue 10, 1-20

Abstract: This paper presents the design of a maximum power point-tracking (MPPT) technique for DC–DC converters that are used in energy-harvesting systems based on thermoelectric generators. This technique is based on the analysis of the characteristics of the converter to measure the open-circuit voltage indirectly. The main contribution of this article is that the algorithm measures the voltage at the maximum power point without the need to disconnect the source of the circuit, as happens when the fractional open-circuit voltage (FOCV) technique is used. The algorithm is based on a predetermined initial duty cycle, which is applied to the circuit, and the input voltage and input current are read. With these values, the open-circuit voltage and short-circuit current are calculated with equations obtained from the circuit. Then, it calculates the duty cycle at the maximum power point and applies it to the circuit. If this duty cycle does not obtain the maximum power from the circuit, the algorithm starts a second stage based on fuzzy logic to calculate an increase or decrease in the duty cycle. The designed technique was evaluated using a topology based on a DC–DC flyback converter variant and was compared with the P&O technique and obtained better results. The designed technique provides between 3.9% and 5.6% more power to the load than the P&O technique in a 20 W system.

Keywords: DC–DC converter; fuzzy logic; indirect measurement; MPPT; open-circuit voltage; thermoelectric generators (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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