In this paper, a systematic and analytical study of non-isolated topologies belonging to the family of reduced redundant power processing (R2P2) converters is presented. Based on this study, all the non-isolated R2P2 topologies that can be implemented in reality are derived. Detailed examples clarify all possible cases of this analysis. In addition to this, the voltage ratio and the efficiency for each one of the R2P2 configurations are calculated, being further illustrated with examples. A comparison among configurations is also discussed with criteria the high step-up voltage gain and efficiency, aiming for high-power applications. One of these R2P2 converters is selected for further examination, as the most suitable for such applications. The theoretical analysis, as well as the calculations of the step-up voltage ratio and efficiency of the selected converter, is compared to experimental results conducted on a 2-kW laboratory prototype designed to operate in various step-up voltage ratios and in a high-power range, proving the effectiveness of the proposed investigation.

Non-Isolated Reduced Redundant Power Processing DC/DC Converters: A Systematic Study of Topologies With Wide Voltage Ratio for High-Power Applications

In this paper, a nonisolated high step-up dc/dc converter, belonging to the family of reduced redundant power processing converters (R2P2), is investigated for high-power applications The selection of this topology as the most suitable for such applications among those belonging to the R2P2 family is justified Emphasis is given on the theoretical analysis of the real step-up voltage ratio of the converter, and voltage and current stresses under continuous and discontinuous conduction modes of operation, taking into account the nonideality of the topology components, namely the parasitic resistances of semiconductor devices and inductors and the voltage drop of diodes The theoretical analysis and the behavior of the selected converter are experimentally validated through a 2 kW prototype Moreover, the overall efficiency of the chosen converter is experimentally investigated for various step-up voltage ratios and for a high-power range, considering a waste heat recovery system for a maritime application

Investigation of a Non-isolated Reduced Redundant Power Processing DC/DC Converter for High-Power High Step-Up Applications

Multilevel inverters (MLI) are frequently used in different fields like, oil and gas sectors, installations of power supply, high power and medium voltage applications and in FACTS (flexible AC transmission system) devices to improve power quality. Lot of topologies has been developed in the literature regarding multilevel inverters such as diode clamped type, flying capacitor type and cascaded H-bridge type multilevel inverters. However, several challenges are being faced while implementing these topologies like more number of switches, more losses and cost. The optimized construction of multilevel inverter is to get more number of levels with less number of switches and low total harmonic distortion. In this paper, three different existing multilevel inverter topologies have been considered and analyzed for five level output voltage. A comparison table is given for number of switches, extra diodes and voltage sources. The total work is carried by using Matlab/simulink software and results are presented.

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Comparative analysis of various multilevel inverter symmetrical topologies with minimum number of components

There is a constant development in power switching converters that can be controlled in a simple way and that can fulfill specific requirements in the energy processing. This work develops the model and control strategy of a converter to incorporate a three-phase rectifier and a DC-DC converter, through the reduced redundant power processing approach. The proposed converter is able to achieve a Unity Power Factor and a regulated DC voltage, the resulting converter can be useful in the power extraction from a wind turbine. Along the work it is demonstrated that the alternating current stage control is independent from the DC stage control. This is confirmed by simulations where the converter operation and the control are verified.

Three-phase converter based on reduced redundant power processing concept

A maximum power point tracking (MPPT) scheme based on a general pulse width modulation (PWM) modulator is presented. The purpose of the scheme is that switching converter behaves as a resistor seen by the photovoltaic module, it also regulates the input voltage to a desired value. The MPPT scheme is applied to a noncascading converter topology, which has the characteristic of processing a fraction of the total power generated.

A maximum power point control scheme applied to a noncascading dc-dc converter for a PV system

A maximum power point tracking (MPPT) scheme based on a power factor correction (PFC) strategy that uses a multiplier approach is presented. The purpose is that the switching converter behaves as a resistor seen by the photovoltaic module, and thus regulate the input voltage to a desired value. Moreover the multiplier approach considers an inner current loop and an outer voltage loop. In order to obtain a stable closed-loop system, a procedure to determine the bounds of controller parameters is developed. Finally, the control scheme is validated through simulation results.

Michel Alejandro Rivero-Corona

Papers

Three-phase converter based on reduced redundant power processing concept

A maximum power point control scheme applied to a noncascading dc-dc converter for a PV system

Maximum power point tracker based on PFC control scheme