Examinando por Materia "Photovoltaic systems"
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- PublicaciónSólo datosAnalysis, Design and Implementation of a Static Conductance-Based MPPT Method(IEEE, 2018-05-15) López-Santos, Oswaldo; García, Germain; Martinez-Salamero, Luis; Giral, Roberto; Vidal-Idiarte, Enric; Merchán-Riveros, María C.; Moreno-Guzman, YamelThis paper introduces a maximum power point tracking (MPPT) method based on a power (P) versus static conductance (G) curve of a photovoltaic (PV) array. The maximum power point (MPP) is tracked by comparing the PV array instantaneous power to a varying power reference generated by the MPPT algorithm. The comparison error is used to reduce or increase the conductance at which the PV array is forced to operate until the MPP is reached. Simultaneously, the error is used to change the power reference until the trajectory of this reference in the P-G curve enters a limit cycle around the MPP. The P-G curve is derived from a piecewise linear approximation of the current versus voltage (I-V) curve, which facilitates the analytical description of the tracking operation. The technique reported can also be implemented by means of simple analog or digital circuitry and requires two sensors to measure the instantaneous PV array current and voltage. It uses only four tuning parameters, which are selected depending on the maximum value of the derivative of the power with respect to the conductance. The theoretical predictions are verified with simulations and experimental results. The latter show that the procedure performs well enough to be favorably compared with the most efficient MPPT methods.
- PublicaciónSólo datosQuadratic boost converter with low-output-voltage ripple(IET Power Electronics, 2020-06-17) López-Santos, Oswaldo; Mayo-Maldonado, Jonathan C.; Rosas-Caro, Julio C.; Valdez-Resendiz, Jesus E.; Zambrano-Prada, David A.; Ruiz-Martinez, Omar F.his study proposes a non-isolated quadratic boost converter (QBC) that features a low-output-voltage ripple with respect to traditional QBCs. This advantage is in contrast with other topologies that require a higher amount of stored energy by capacitors to achieve the same output-voltage ripple specification. This benefit permits to design a compact converter, since the size of capacitors is proportional to their energy storage rating. Moreover, the proposed transformerless topology is suitable for applications that require high-voltage gains as in the case of renewable energy applications. The main properties of the converter are corroborated as well as its advantages by providing mathematical models, analytical waveforms and experiments.