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This paper presents an integral solution of the overvoltage problem caused by mismatched conditions when DC-DC converter outputs of PV systems are connected in series, and a distributed maximum power point tracking architecture is implemented. The operating conditions that cause the overvoltage problem are discussed in detail and the consequences of the overvoltage problem are illustrated. The proposed solution is based on a structure that includes a non-linear controller, two linear controllers, and a maximum power point tracking algorithm. Such a solution makes it possible to regulate the PV voltage according to the MPPT controller commands and to limit the DC-DC converter output voltage to avoid damages. The non-linear control structure is experimentally validated with a boost converter and a BP585 PV panel. Simulation results show that the proposed integral solution allows the operation of PV panels in the feasible maximum power point and protects the integrity of the DC-DC converters, avoiding the overvoltage problem caused by mismatched conditions.

Tipo de documento: Artículo - Article

Información adicional: Derechos de autor reservados

Palabras clave: photovoltaic systems, DC-DC converters, overvoltage protection, distributed maximum power point tracking





Fuente: http://www.bdigital.unal.edu.co


Introducción



DISTRIBUTED MAXIMUM POWER POINT TRACKING WITH OVERVOLTAGE PROTECTION FOR PV SYSTEMS SEGUIMIENTO DISTRIBUIDO DEL PUNTO DE MAXIMA POTENCIA CON PROTECCION DE SOBREVOLTAJE CARLOS ANDRÉS RAMOS-PAJA Ph.D., Profesor Facultad de Minas, Universidad Nacional de Colombia, Sede Medellín, caramosp@unal.edu.co ANDRÉS JULIÁN SAAVEDRA-MONTES Ph.D., Profesor Facultad de Minas, Universidad Nacional de Colombia, Sede Medellín, ajsaaved@unal.edu.co MASSIMO VITELLI Doctor, Dip.
Ingegneria dell’Informazione, Second University of Naples, Aversa (CE), Italy, vitelli@unina.it Received for review July 4 th, 2012, accepted October 9th, 2012, final version October, 11 th, 2012 ABSTRACT: This paper presents an integral solution of the overvoltage problem caused by mismatched conditions when DC-DC converter outputs of PV systems are connected in series, and a distributed maximum power point tracking architecture is implemented.
The operating conditions that cause the overvoltage problem are discussed in detail and the consequences of the overvoltage problem are illustrated.
The proposed solution is based on a structure that includes a non-linear controller, two linear controllers, and a maximum power point tracking algorithm.
Such a solution makes it possible to regulate the PV voltage according to the MPPT controller commands and to limit the DC-DC converter output voltage to avoid damages.
The non-linear control structure is experimentally validated with a boost converter and a BP585 PV panel.
Simulation results show that the proposed integral solution allows the operation of PV panels in the feasible maximum power point and protects the integrity of the DC-DC converters, avoiding the overvoltage problem caused by mismatched conditions. KEYWORDS: photovoltaic systems, DC-DC converters, overvoltage protection, distributed maximum power point tracking RESUMEN: Este artículo presenta una solución integral al problema de sobrevoltaje en sistemas fotovoltaicos, el cual aparece cuando las...






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