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.

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

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.

https://ietresearch.onlinelibrary.wiley.com/doi/pdf/10.1049/iet-pel.2015.0406

Transformerless high-gain DC–DC converter for microgrids

The use of green energy sources to feed DC microgrids is gaining prominence over traditional centralised AC systems. DC microgrids are characterised by the use of intermediate DC-DC converter which acts as power conditioning units. Hence, the choice of an appropriate DC-DC converter becomes significant as the overall system efficiency is strongly dependent on the converter’s performance. This paper proposes a novel high gain high power (HGHP) DC-DC converter for DC microgrid, which is of one of the significant step forward in the development of DC microgrids. The suitability of the proposed HGHP DC-DC converter is demonstrated by experimental tests of the 60V/1.1kV, 3kW converter; test results validate the converter’s suitability for DC distribution. A significant number of performance parameters of the proposed converter is compared with state of the art converter topologies demonstrating the superior capabilities of the proposed converter. This paper also portrays the potential benefits that could be reaped by trending towards DC instead of existing AC system. The advantages and challenges to be confronted in the foreseeable future while implementing sustainable DC microgrids are also highlighted. Finally, this paper encapsulates renewable energy fed DC microgrid system as an appropriate, technically feasible, economically viable and competent solution for efficiently utilising the sustainable energy sources.

/pdf/high-gain-high-power-hghp-dc-dc-converter-for-dc-microgrid-39eaols47y.pdf

High gain - high power (HGHP) DC-DC converter for DC microgrid applications: design and testing

This article advises a simple high voltage-gain boost converter for interfacing a low voltage renewable energy source to high voltage DC-link. The proposed converter could produce high quality input/output powers, which reduces the losses and filtering requirements in input/output stages. The article introduces also a thorough mathematical analysis for the operation theory of the proposed converter. Moreover, the dynamic performance of the proposed converter is investigated for two distinct cases: driving a PV module at maximum power point under different climatological conditions and interfacing an energy storage element to DC-link. The internal model control technique is used here for tuning the proportional integral controller. The proposed converter and its controller are simulated in Matlab Simulink dynamic platform. The simulation results for different operating scenarios of the proposed DC/DC converter confirms its salient merit in producing high value/quality DC voltage.

Simple high voltage-gain DC/DC boost converter for renewable energy sources interfacing

This paper presents a new modified structure of the SEPIC converter topology using series magnetic coupling and voltage multiplier in order to obtain an elevate voltage gain. The application fields that this converter will be used includes: combined with embbeded systems and photovoltaic modules. The proposed converter is analyzed focusing in its operation stages e observing the effort on the semiconductors e voltages on the other components. The theoretical and experimental results of the proposed converter are described on this paper and shows the converter's efficiency through parameters such as: low voltage on switch, low input current ripple and high output voltage.

Modified sepic converter with serial magnetic coupling and voltage multiplier cell

In this paper, a non-isolated high step-up high power DC-DC converter based on coupled inductor and voltage multiplier cell (VMC) is proposed for renewable energy applications. To obtain high voltage gain and high output power, three interleaved coupled inductors and three VMCs are used. Each VMC consists of secondary winding of the coupled inductor, two diodes and two capacitors which charge and discharge alternately through the diodes. The three stages present in interleaved boost converter reduce the current stress on the switch and input current ripple. Voltage stress on the power switches is reduced by using coupled inductors with proper turns ratio. The proposed converter produces a voltage gain of 23 and delivers 3kW power output. The converter has a modular structure which facilitates smooth increment in voltage gain and output power requirement. The operating principle, characteristic waveforms, design details and simulation results of the proposed converter prove the desirable features.

High gain high power non-isolated DC-DC converter for renewable energy applications

A hybrid non-isolated compact DC–DC converter with high voltage conversion ratio and operating at higher power level is proposed in this paper. A three phase interleaved structure comprising of cou...

Sri Revathi Balapattabi

Papers

High gain high power non-isolated DC-DC converter for renewable energy applications

A Novel Compact Hybrid Converter for DC Distribution