In this paper, a novel non-isolated DC-DC converter topology is proposed for solar photovoltaic (PV) application. The proposed converter is constructed from an interleaved boost converter (IBC) to reduce the input current ripple. Voltage gain is extended by (i) using voltage lift technique, (ii) replacing the conventional inductors of the IBC by coupled inductors (CIs) with appropriate turns ratio and (iii) connecting a voltage multiplier cell (VMC) across the secondary windings of the CIs. As the voltage gain is extended mainly at the secondary side of the CIs, the switches are subjected to low voltage stress which is only 12.63% of the output voltage. The converter yields a high voltage conversion ratio of 15.83. Experimental results obtained from a 24 V/380 V, 225 W prototype converter operating at 91.6% efficiency serves as a proof of the presented concept which has been employed to achieve high voltage conversion ratio (15.83) with low input current ripple (20%). © 2019 International Solar Energy Society

Sri Revathi B

Electrical

School of Electrical Engineering

Chennai Campus

Prabhakar M

Gonzalez-Longatt F.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Solar Energy

This paper presents a single switch non-isolated DC-DC converter with high voltage gain capability for solar photovoltaic (PV) applications. The proposed converter is synthesized from passive switched inductor (SI) and switched capacitor (SC) topologies and integrated with an additional voltage boost capacitor to enhance the voltage gain. Due to the converter structure and adopted gain extension technique, the voltage stress on the switch and three diodes is 50% of the output voltage, while the remaining diodes experience a voltage stress of only 25% of the output voltage. Experimental results obtained from a 34 V/380 V, 200 W prototype converter validate the proposed concept, adopted design procedure and illustrates the fact that the proposed converter operates at a full load efficiency of 93%. Further, the proposed converter provides better component utilization compared to some existing converters. © 2018 Elsevier Ltd

A novel single switch dc-dc converter with high voltage gain capability for solar PV based power generation systems

This manuscript discuss about the various DC-DC converter configurations with high voltage conversion ratio utilized in DC micro-grid structures. The presented DC-DC converter topologies play a major role globally in the power generation sector including micro-grid, because of its decreased number of semiconductor devices, maximum conversion efficiency, small in size and cost of manufacturing is less. In this manuscript the DC-DC converter are categorized in to isolated and Non-isolated topologies. The first group topography works with the presence of transformer and the second group works without the transformer. These converters are capable to provide the various stages of output range. Researchers utilize these converters in the area of renewable energy generation, electric vehicle, micro sources, charge pumping applications etc. Hence they also work to improve the efficiency and reliability with reduction in components numbers and economical aspect. In this manuscript, the various topography of DC-DC converter topologies utilized in micro-grid are reviewed and comparison is made based on voltage conversion ratio, duty ratio, efficiency along with the basic operating principle. This review also reveals the research gaps, current trends, and challenges in the last part. © 2017 Elsevier Ltd

Renewable and Sustainable Energy Reviews

An overview of high voltage conversion ratio DC-DC converter configurations used in DC micro-grid architectures

This study proposes a novel non-isolated high-gain high-power DC-DC converter. The converter is developed from a basic high-gain high-power converter structure. The proposed converter comprises of a three-phase interleaved boost converter, one coupled inductor and a voltage multiplier cell which act as gain extension stage. The main desirable features like voltage gain, stress on the switches and diodes, turns ratio, component utilisation factor and efficiency are summarised. The power circuit, operational details, simulation and experimental results of the 60 V/1.1 kV, 3 kW, 100 kHz proposed converter are presented. © The Institution of Engineering and Technology 2016.

IET Power Electronics

Transformerless high-gain DC–DC converter for microgrids

To meet the ever increasing electrical energy demand, energy conversion from PV sources is gaining prominence. When used in conjunction with existing power system network, the energy extracted from the renewable energy sources can be utilized to electrify remote areas also. The advancements in DC-DC converter topologies and inverter control strategies have led to the wide emergence of grid tied PV systems. The efficiency at which power is fed to the grid hinges largely on the proper choice and performance of the DC-DC converter stage. Hence, there is a compelling need to thoroughly review the performance of existing DC-DC converter topologies. In this paper, a comprehensive review on the evolution and design aspects of High Gain High Power (HGHP) DC-DC converters employable for solar PV fed system is presented. A simple and generalized strategy to derive high gain high power DC-DC converters has been developed and presented. The salient features of five novel converter topologies that have been derived by using the proposed strategy are elaborated to illustrate the validity of the adopted synthesis methodology. The salient features and the feasibility of connecting the derived topologies to the DC grid/micro grid are highlighted. © 2016 Elsevier Ltd

Non isolated high gain DC-DC converter topologies for PV applications – A comprehensive review

The output voltage available from renewable sources like photovoltaic panels, fuel cells and battery banks are too low to be practically utilised. Therefore, the available voltage must be stepped up considerably before connecting to the load. In this paper, a novel topology, which consists of two interleaved stages and five voltage multiplier cells, is presented. The topology is derived from a classical boost converter and utilises two switches, two inductors for the interleave stage,12 diodes, 12 capacitors and one voltage lift capacitor to provide a voltage gain of 14. In general, a topology that provides a gain (N + 2) times that of a classical boost converter utilises (2N + 2) diodes and (2N + 2) capacitors along with a voltage lift capacitor. The primary feature of this topology is its capability to provide high-conversion ratio without using a transformer; additional features are, continuous input current, moderate duty cycle operation and modularity. Experimental results obtained from a 100 W, 24 V/336 V prototype demonstrate the feasibility of the converter and validate the converter design. © 2014 Inderscience Enterprises Ltd.

Journal	Data powered by TypesetSolar Energy
Publisher	Data powered by TypesetElsevier BV
ISSN	0038-092X
Open Access	No