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Open- and Short-Circuit Fault Identification for a Boost dc/dc Converter in PV MPPT Systems

1
Coord. Acad. Región Altiplano, Universidad Autónoma de San Luis Potosí, 78700 Matehuala, S.L.P., Mexico
2
Applied Electronics Group, Universidad Nacional de Río Cuarto, Río Cuarto 5800, Córdoba, Argentina
3
Faculty of Engineering, Universidad Nacional Autónoma de México, México City 04510, Mexico
*
Author to whom correspondence should be addressed.
Energies 2018, 11(3), 616; https://doi.org/10.3390/en11030616
Received: 8 February 2018 / Revised: 26 February 2018 / Accepted: 6 March 2018 / Published: 9 March 2018
(This article belongs to the Section Electrical Power and Energy System)
This paper proposes a fault identification system for short and open-circuit switch faults (SOCSF) for a dc/dc converter acting as a Maximum Power Point Tracker (MPPT) in Photovoltaic (PV) systems. A closed-loop operation is assumed for the boost dc/dc converter. A linearizing control plus a Proportional-Derivative (PD) controller is suggested for PV voltage regulation at the maximum power point (MPP). In this study, the SOCSF are modeled by using an additive fault representation and the fault identification (FI) system is synthesized departing from a Luenberger observer. Hence, an FI signal is obtained, which is insensitive to irradiance and load current changes, but affected by the SOCSF. For FI purposes, only the sensors used in the control system are needed. Finally, an experimental evaluation is presented by using a solar array simulator dc power supply and a boost dc/dc converter of 175 W in order to validate the ideas this study exposes. View Full-Text
Keywords: fault diagnosis; photovoltaic systems; mppt; boost dc/dc converter fault diagnosis; photovoltaic systems; mppt; boost dc/dc converter
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Espinoza Trejo, D.R.; Bárcenas, E.; Hernández Díez, J.E.; Bossio, G.; Espinosa Pérez, G. Open- and Short-Circuit Fault Identification for a Boost dc/dc Converter in PV MPPT Systems. Energies 2018, 11, 616.

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