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.

Sri Revathi B

Electrical

School of Electrical Engineering

Chennai Campus

Prabhakar M

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

IET Power Electronics

In this paper a non-isolated high gain DC-DC converter which is preferred for photovoltaic (PV) applications is proposed. This converter uses hybrid switched inductor technique to enhance its overall voltage gain. The inductors of the gain extension network are all charged together in parallel and get discharged simultaneously in series to obtain the high voltage gain (&gt;10). Resultantly, the voltage stress experienced by the switches of the proposed converter are reduced to 55% of the desired output voltage. An experimental prototype version of the proposed converter yields the rated voltage gain of 10.8 and delivers 21OW at a maximum efficiency of 94.45% when excited from an input voltage of 35 V. Further, the operating range of the converter is demonstrated by experimental results which are obtained for an output power ranging from 90% to 95% of rated power. © 2019 IEEE.

2019 IEEE International Conference on System, Computation, Automation and Networking (ICSCAN)

High Gain DC-DC Converter Based on Hybrid Switched-Inductor Topology for PV Application

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

Solar Energy

Interleaved high gain DC-DC converter for integrating solar PV source to DC bus

Renewable and Sustainable Energy Reviews

Review and comparative study of single-stage inverters for a PV system

This paper proposes a three phase interleaved high gain DC-DC converter for photovoltaic (PV) applications. Interleaving technique reduces the input current ripple and current stress on the power switch while simultaneously handling high power. The voltage gain is extended by using a voltage lift capacitor, coupled inductor and voltage multiplier cell. Since voltage gain extension is realized at the secondary side of the coupled inductors, the voltage stress on the switches is only a fraction of the output voltage. Experimental results obtained from a 24V/260V, 500W prototype converter proves the converter suitability for high step up voltage conversion. © 2017 The Authors. Published by Elsevier Ltd.

Fulltext

Energy Procedia

High Step-Up DC-DC Converter with Reduced Switch Stress and Low Input Current Ripple

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

A hybrid non isolated high step up high power converter with asymmetric interleaved boost converter and voltage multiplier cell with one multi-coupled inductor is proposed in this paper. Appropriate coupling of primary and secondary windings of the coupled inductor enhances the voltage gain and power delivering capability. Turns ratio of the coupled inductors is kept very small so that the leakage energy does not induce high voltage stress which results in incremental switching losses. To reduce the current stress on the switches, current through the device is shared by applying interleaving technique to the first stage of the proposed converter. The proposed converter is capable of producing a gain of 36 at a power level of 3kW. Design details of a 60V/2.2kV, 3kW DC-DC converter that operates at 100 kHz are presented. Simulation results validate the design details and prove the superior features of the proposed converter. © 2014 IEEE.

2014 IEEE 2nd International Conference on Electrical Energy Systems (ICEES)

Non isolated high gain high power DC-DC converter

In this paper, a novel DC-DC converter topology that provides very high gain at high power rating is presented. The proposed DC-DC converter is obtained by combining interleaved boost converter (IBC), coupled inductor and switched capacitor. Voltage gain expression and design equations of the proposed converter are derived. The operational modes, characteristic waveforms and the design details of the 60V/6.6kV, 3kW DC-DC converter are also presented. Results obtained from simulation prove that the converter is capable of providing a very high voltage gain of 100 at high power rating of 3kW. Based on the proposed design and simulation results, it is observed that the voltage and current stress of the main switch is within acceptable limits. Thus, the proposed converter promises to be a suitable alternative to existing topologies in DC microgrid applications. © 2013 IEEE.

2013 Annual IEEE India Conference (INDICON)

Analysis and design of ultra-high step up converter for DC microgrids

This paper introduces a novel high gain DC-DC converter topology which can be used for photovoltaic (PV) applications. The proposed DC-DC converter consists of 3 interleaved boost converters and 2 voltage multiplier cells (VMC). The operating principle, characteristic waveforms, design details along with the simulation results prove the validity of the design and its superiority over existing converter topologies in terms of its ability to provide high voltage gain at higher power level and low device stress. The proposed topology is able to produce a voltage gain of 10 and deliver 3kW output power at 88% efficiency. © 2013 IEEE.

2013 Annual International Conference on Emerging Research Areas and 2013 International Conference on Microelectronics, Communications and Renewable Energy

Journal	IET Power Electronics
Publisher	Institution of Engineering and Technology (IET)
ISSN	1755-4535
Open Access	No