Navegando por Assunto "Photovoltaic pumping systems"

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Acesso aberto (Open Access)
Avaliação teórica experimental de sistemas fotovoltaicos de bombeamento de água
(Universidade Federal do Pará, 2024-01-24) SILVA, Gabriel Bastos de Souza; MACÊDO, Wilson Negrão; http://lattes.cnpq.br/3386249951714088; https://orcid.org/0000-0002-6097-8620
The photovoltaic pumping system represents a sustainable solution to provide access to potable water in remote communities of the Amazon region, whether for human consumption or agricultural irrigation, in areas with limitations in electrical supply from the local utility company. A central component of this system is the motor pump, responsible for suctioning the fluid and conveying it through a piping system to the desired destination and is often associated with a power conditioning device. This device acts as a converter from direct current to alternating current and may incorporate a mechanism for tracking the maximum power point of the photovoltaic generator. However, in photovoltaic systems, it is common for the motor pump to operate at frequencies below the nominal, resulting in lower efficiency compared to situations where energy supply is constant from the local electrical grid. Therefore, this study proposes an approach based on theoretical equations of the system components, aiming to predict an optimized operating point for the pump, considering factors affecting the performance of the photovoltaic generator, such as solar irradiance and temperature. To achieve this, the laboratory of the Study and Development of Alternative Energy Group has a test bench for simulating manometric heights. This was employed in this study to compare the performance of three photovoltaic pumping systems with simulations conducted in a MATLAB program, developed in a doctoral thesis defended in the Graduate Program in Electrical Engineering at the Federal University of Pará. The results highlighted the effectiveness of the methodology in identifying an optimal efficiency point for these systems, suggesting its applicability in specific types of pumping systems. Although in some situations, real-world operation showed discrepancies compared to predictions, overall, this model proved to be valuable for guiding projects aimed at implementing photovoltaic pumping systems in specific wells with enhanced energy efficiency.
Acesso aberto (Open Access)
Controlador fuzzy para uso em conversores de frequência aplicado à sistemas fotovoltaicos de bombeamento
(Universidade Federal do Pará, 2015-11-06) MARANHÃO, Geraldo Neves de Albuquerque; BRITO, Alaan Ubaiara; http://lattes.cnpq.br/9194391143997588; MACÊDO, Wilson Negrão; http://lattes.cnpq.br/3386249951714088
This work proposes a fuzzy controller applied to a commercial variable-speed drive (VSD) for use in direct-coupled photovoltaic pumping systems (PVPS). The fuzzy logic system used is embedded in a controlling programming device (CPD) connected to the auxiliary input of the VSD for controlling the pump's working speed according to the power provided by photovoltaic generator (PVG). The objective is to avoid unintended behaviors in the d.c. bus voltage level VSD and cause the system to operate near the point of maximum efficiency. The control methodology is based on achieving the dynamic be-havior of the irradiance with which the PVPS is subjected via two different methods of low cost sensing, namely: using a light-dependent resistor (LDR) and using a low power sensor module. Experimental tests were performed using two tests bench for motor pumps able to simulate several-head wells. The results confirm the feasibility of using fuzzy con-troller with both sensing methods. Using LDR it possible to ensure the availability of PVPS, since it could suppress the undesired undervoltage errors, as with the methodology using the sensor module, and ensure availability of the system was obtained also satisfac-tory yield assembly VSD + motor pump, with a daily average efficiency of approximately 23 %.