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This paper describes a new application of SEPIC (Single Ended Primary Converter) and Cuk converter for distributed generation systems. A DC/DC converter configuration based on a combination of both converters is proposed. In the resulting topology the switching node is shared by the SEPIC and Cuk converter, since they have the same instantaneous duty cycle. This topology allows the connection of renewable...
The basic operation of a solar cell, module or photovoltaic generator under different irradiation and temperature conditions is characterized by its I-V characteristic curve. Only the experimental measurement of the I-V curve allows us to know the electrical parameters of a photovoltaic cell, module or array. This measure provides very relevant information for the design, installation and maintenance...
In this paper, the usefulness of several topologies of DC-DC converters for measuring the characteristic curves of photovoltaic (PV) modules is theoretically analyzed. Eight topologies of DC-DC converters with step-down/step-up conversion relation (buck-boost single inductor, CSC (canonical switching cell), Cuk, SEPIC (single-ended primary inductance converter), zeta, flyback, boost-buck-cascaded,...
This paper gives a general approach to the development of duty cycle sweep (DCS) in fixed switching frequency pulse width modulated (PWM) strategies based on microcontroller. The flexibility of the PWM signal generated is characterized by: 1) Fixed duty cycle or variable between 0% and 100%. 2) Duty cycle sweep in both directions: increase from 0% to 100% and decrease from 100% to 0%.3) duty cycle...
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