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This paper describes a study, which enables the implementation of a microinverter for grid-tied photovoltaic applications. The system consists of a Ćuk converter in cascade with a full-bridge current source inverter. The Ćuk converter, working in DCM, synthesizes a sinusoidal current waveform, in absolute value, synchronized with the power grid. A simple square wave (SQW) full bridge current source...
This paper reports a study on a grid-tied photovoltaic system, using a microinverter based on Ćuk converter working in DCM. Since, when the Ćuk converter is working in DCM, its output voltage presents a linear behavior in relationship to its duty cycle. Therefore, the duty cycle must have a sinusoidal behavior, in absolute value, in order to generate a rectified sine current waveform, at its output...
This paper presents a high power factor single-stage driver powering a high-power-LED. The driver employs a PFC based on a Zeta converter, using the One-Cycled Control (OCC) technique. A design procedure for Zeta converter is presented, which is based on the flyback converter as proposed by (Lamar, et al. [1]). Through simulation results of Zeta converter working as PFC, classical OCC and exponential...
This paper proposes a modified maximum power point tracking method (Perturbation and Observation) based on the use of the information from the derivative of power and the derivative of the voltage on the PV panel. The main contribution of this work resides in the employment of the derivative of voltage that is used to determine instantaneously the increment or decrement ratio of the converter duty...
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