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This work presents a brief description of stage integration for photovoltaic system converters. In low power PV applications the output voltage available is low and a boost stage is necessary for regulated stand-alone or grid-connected. In the most usual topologies, the boost stage and the inverter stage are separated and cascaded. It simplifies the control schemes and it improves the power decoupling...
In order to achieve power electronics converters with reduced weight and size the increase of the switching frequencies becomes mandatory. However, switching losses blocks practical implementation of power electronics converters switching at very high frequencies. Therefore, soft-switching techniques have been attracting great interest in the scientific community and power electronics converters with...
The need for solid-state ac-dc converters to improve power quality in terms of power-factor correction (PFC), reduced total harmonic distortion at input ac mains, and precisely regulated dc output have motivated the proposal of several topologies based on classical converters such as buck, boost, and buck-boost. Additionally, novel control techniques dedicated to PFC have also been introduced, motivating...
A new high voltage gain dc-dc converter is proposed on this work as a viable solution to step-up a low battery voltage into a high voltage dc link. This converter is suitable for non-isolated on-line UPS systems with common neutral connection, that improves bypass circuit installation. Furthermore, smaller size, higher efficiency, and increased reliability are features that spread the transformerless...
This paper presents the small-signal modeling and the control design of the six-phase Interleaved Double Dual Boost, which is a non-insulated, step-up DC-DC converter that can be operated with high voltage gain and can be scaled to high-power applications. The applications of this converter include electrical vehicles and renewable energy conversion. Experimental results obtained with a prototype...
This paper presents a three-state switching cell single-phase three-level boost rectifier with Power Factor Correction (PFC) using FPGA digital control. Its main features are: reduced conduction losses, weight and volume; simple digital control strategy based on One-Cycle Control (OCC) technique using FPGA; connection between input and output enabling the use of inverter and bypass for UPS application...
Often small and middle-size systems usually lack of a dynamical model which is not known in all. Moreover most of them are based on those classical PID controllers featured in not having a controlling system through a setpoint variable during the whole time where the process is in evolution. In this paper, a strategy of control based on a Nonlinear Model Predictive Control (NMPC) for nonlinear systems...
This paper presents a high voltage gain DC-DC converter. The proposed converter is based on the Sepic topology using the three-state switching cell. This converter is suitable for applications with a high voltage gain between the input and the output, as well as, UPS and renewable energy system. Another important feature of this converter is the lower blocking voltage across the controlled switches...
This paper presents a method to minimize the losses and the magnetic cores volume in a single-phase active power filter based in a two stages grid-connected PV system. The proposed circuit injects PV generated power into the utility, and always acts as an active power filter to compensate load harmonics and reactive power such that the input power factor is very high independently of the solar radiation...
The study of high-voltage isolated DC/DC converters used to supply pulse modulators is presented on this paper. The Full Bridge topology was selected, focusing in problems caused by parasitic capacitances in the circuit. This characteristic, which appears sharply in high voltage transformers and in inductors of output filter, is highly undesirable when the circuit is operated in switching mode. These...
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