Nilanjan Tewari

Bio: Nilanjan Tewari is an academic researcher from VIT University. The author has contributed to research in topics: Voltage & Switched capacitor. The author has an hindex of 2, co-authored 8 publications receiving 39 citations.

Family of modular, extendable and high gain dc–dc converter with switched inductor and switched capacitor cells

Abstract: This study presents a family of novel high gain non-isolated hybrid dc-dc converter for dc micro grid application. The proposed family of the converter is developed by employing both inductor-capacitor-inductor (LCL) based switched inductor (SI) and switched capacitor (SC) technique to achieve high voltage gain. Appropriate increase in the number of LCL-based SI cells in the power circuits in order to achieve ultra-high voltage gain allows formulating a generalised structure of the circuit. Incorporation of SI & SC techniques and the structure of the circuit with one stage power transfer ensure high voltage gain at low voltage stress across the switches and diodes. The study includes the principle of operation, steady-state analysis and performance analysis in detail for the converters. Experimental results from the developed hardware prototype of 380 V/250 W validate the adopted concept, design and exemplify that the proposed family of converter operates at a full load efficiency of 94%.

Implementation of Designed PV Integrated Controlled Converter System

Abstract: Photovoltaic (PV) energy has increased drastically at an average annual rate of 60% in the last few years. It quickly became an integral part of the power system networks. This increase, in turn, has triggered the evolution of PV power converters with more efficiency and reliability. In this paper, a prototype of the PV integrated controlled converter system is designed, which is applicable in water pumping for irrigation. Main components of this system are floating dual boost converter (FDBC), three-phase voltage source inverter (VSI) and three-phase squirrel cage induction motor (pump). For address the issue of PV voltage fluctuations, a voltage mode controller is designed for the FDBC which regulates the output voltage of the FDBC to a fixed value irrespective of any voltage fluctuations at the PV side.

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

Abstract: 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 (>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.

Switched Inductor-Switched Capacitor based high gain hybrid dc-dc converter

Abstract: This paper deals with a new non-isolated high voltage gain hybrid dc-dc converter for dc micro grid applications. The proposed converter utilizes both the switched inductor (SI) and switched capacitor (SC) technique to attain a high gain. The suggested voltage lifting mechanisms result in reduced voltage stress on switches (about 45% of the output voltage) and diodes. A hardware prototype of 380V/120Watts is developed in laboratory and presented here. Experimental results and a brief comparison with other high gain converters included in the paper, confirms the capability of the proposed converter to provide high voltage gain at very low duty cycle with low voltage stress on switches and diodes used.

Integration Of Alternative Sources Of Energy

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Non-isolated high step-up DC/DC converters – An overview

Abstract: High step-up, high efficiency, low cost DC/DC converters have operated as an interface to make use of the renewable energy system generated power. In order to obtain desired output voltage, the DC/AC voltage conversion to AC mains voltage is an important consideration mainly achieved through inverters. Taking into acoount the performance of the non-isolated high step-up DC/DC converters for the renewable energy systems, the substantial amount of topologies studied in past years are the non-isolated high step-up DC/DC converters. Based on proposed and generalized configurations, the non-isolated high step-up DC/DC converters are classified into several categories and reviewed in this paper. So, to clarify the distinguishing solutions, the key features; topological variations, merits and demerits of these converters are discussed and compared. This review work aims to give a well-informed and a well-detailed general framework about these converters and facilitates to derive the new well topologies in the future.