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dc.contributor.advisorOrtiz-Rivera, Eduardo I.
dc.contributor.authorGonzález-Llorente, Jesús David
dc.description.abstractDue to the nonlinear behavior of the photovoltaic (PV) cells, dc-dc power converters are added for matching the load to the photovoltaic generators; thus, maxi- mum power can be reached. In this thesis, mathematical models were used to examine the behavior of the off-grid photovoltaic system composed by: PV generator, dc- dc converter and dc motor. Different converter topologies (step-up, step-down and step-down/step-up) are compared, evaluating their feasibility to be used as interface to attain operation around the maximum power point (MPP). The analysis found the relationships between the optimal duty ratio and the maximum motor speed, which are used to select the simplest topology to meet the requirement as inter- face. Moreover, several maximum power point tracking (MPPT) methods including model-based MPPT methods and MPPT searching algorithms are implemented on a microcontroller and tested in real weather conditions. MPPT searching algorithms are recommended for real applications, such algorithms do not require tuning due to parameter variations by aging or dusty environment of the PV module and the fluctuation of the PV voltage has little effect on the motor speed.en_US
dc.description.abstractDebido al comportamiento no lineal de los módulos fotovoltaicos, es necesario usar convertidores de corriente continua para extraer más potencia por medio del acople de carga. Se utilizan modelos matemáticos para estudiar el comportamiento de un sistema fotovoltaico compuesto de: generador fotovoltaico, convertidor de potencia y motor de corriente continua. Diferentes topologías de convertidores de potencia (reductora, elevadora y reductora-elevadora) son comparadas, evaluando la viabilidad de ser usadas como interfaces para obtener operación alrededor del punto de máxima potencia. Se deriva la relación entre el ciclo útil del convertidor y la velocidad máxima del motor; la cual permite seleccionar la topología más simple que cumple los requerimientos como interface. Además, métodos basados en modelo y métodos de búsqueda para el seguimiento del punto de máxima potencia son implementados en un microcontrolador y probados bajo condiciones climáticas reales. Los métodos de búsqueda son recomendados para aplicaciones prácticas, ya que no requieren ajuste debido al cambio de parámetros de los módulos fotovoltaicos y del poco efecto de la variación del voltaje sobre la velocidad del motor.en_US
dc.titleAnalysis of optimal matching between a dc motor and photovoltaic modules via dc-dc power convertersen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2009 Jesús David González-Llorenteen_US
dc.contributor.committeeBeauchamp-Báez, Gerson
dc.contributor.committeeVenkatesan, K.
dc.contributor.representativeRios-Soto, Karen R. Engineeringen_US
dc.contributor.collegeCollege of Engineeringen_US
dc.contributor.departmentDepartment of Electrical and Computer Engineeringen_US

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    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a degree at UPR-Mayagüez.

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