Search results for: Shubhrata Gupta

Items from 1 to 18 out of 18 results

article

Highly resilient 17‐level fault‐tolerant multilevel inverter topology with reduced capacitor size

Anilkumar Chappa, Shubhrata Gupta, Lalit Kumar Sahu, Krishna Kumar Gupta, more

International Journal of Circuit Theory and Applications > 52 > 6 > 2803 - 2822

Multilevel inverters (MLIs) have recently drawn the huge attention of industry and academia since they are becoming a viable technology for a variety of applications. However, the risk of failure of the converter increases with the increasing number of component count for applications involving heavy duty and continuous operation. In this context, an asymmetrical source configured FT‐MLI (fault tolerant‐MLI)...

article

Teager energy assisted variational mode decomposition‐based fault location technique for STATCOM compensated system

Saswati Mishra, Shubhrata Gupta, Anamika Yadav

International Journal of Numerical Modelling: Electronic Networks, Devices... > 36 > 5 > n/a - n/a

Modern power systems are structurally complex and thus experience transient events. For secure and reliable operation, quick system restoration is required whenever transient phenomenon like line faults occurs. Fault location techniques (FLTs) aid in faster restoration process. However, the accuracy of FLTs gets affected in presence of static synchronous compensator (STATCOM) since STATCOM compensates...

article

Improved Optimum Nonnegative Integer Bit Allocation Algorithm Using Fuzzy Domain Variance Estimation and Refinement for the Wavelet-Based Image Compression

Vikrant Singh Thakur, Kavita Thakur, Shubhrata Gupta, K. R. Rao

Circuits, Systems, and Signal Processing > 2019 > 38 > 8 > 3880-3900

Optimum nonnegative integer bit allocation (ONIBA) is a conspicuous technique, which usually provides the solution of optimal quantization issues for the transform coders (TCs). In order to obtain the optimum bits for a specific quantizer, all the existing ONIBA algorithms strongly rely on the variance characteristics of transform coefficients. Typically, in the wavelet-based TCs, the sub-band variances...

article

Fuel cell power conditioning unit for standalone application with real time validation

Tata Venkat Dixit, Phani Teja Bankupalli, Anamika Yadav, Shubhrata Gupta

International Journal of Hydrogen Energy > 2018 > 43 > 31 > 14629- 14637

In recent era, fuel cells are emerging as better alternative to wind and solar based energy sources due to its reliability and high efficiency. Polymer Electrolyte Membrane Fuel Cell (PEMFC) is widely used in various applications due to low operating temperature and high energy density. On the other side low and unregulated stack voltage demands PEMFC integration with suitable power conditioning unit...

article

Hybrid WPT-BDCT transform for high-quality image compression<?show [AQ ID=Q1]?>

Vikrant Singh Thakur, Shubhrata Gupta, Kavita Thakur

IET Image Processing > 2017 > 11 > 10 > 899 - 909

The image compression performance of transform coders highly depends on the energy compaction (EC) capability of transforms. The popular transforms such as discrete cosine transform (DCT) and discrete wavelet transform (DWT) provide decent EC; however, their capability is not enough to deliver good quality image reconstruction for higher compression levels (CLs). In this study, the authors propose...

article

Reliability improvement of transistor clamped H-bridge-based cascaded multilevel inverter

Shivam Prakash Gautam, Shubhrata Gupta, Lalit Kumar

IET Power Electronics > 2017 > 10 > 7 > 770 - 781

Reduced voltage stress and low-total harmonic distortion are the main causes for such widespread application of multilevel inverters (MLIs) in various industrial sectors. However, reliability is one of the major concerns of MLIs as it uses a large number of switches as compared with two-level inverters. Therefore, a newly developed transistor clamped H-bridge inverter is proposed in the literature...

article

A Single-Phase Five-Level Inverter Topology With Switch Fault-Tolerance Capabilities

Shivam Prakash Gautam, Lalit Kumar, Shubhrata Gupta, Nitesh Agrawal

IEEE Transactions on Industrial Electronics > 2017 > 64 > 3 > 2004 - 2014

Low reliability is one of the major concerns of multilevel inverter due to the requirement of a large number of semiconductor devices as compared to two-level inverters. Thus, in this paper, a novel topology of multilevel inverter is proposed that can tolerate both open and short-circuit faults on its switches. The proposed topology also reduces dc sources and capacitors as compared to the conventional...

chapter

Optimal quantization table generation for efficient satellite image compression using teaching learning based optimization technique

Vikrant Singh Thakur, Shubhrata Gupta, Kavita Thakur

2017 International Conference on Big Data Analytics and Computational Intelligence (ICBDAC) > 52 - 56

2017 International Conference on Big Data Analytics and Computational Intelligence (ICBDAC)

Communication of the satellite images plays a crucial role in many important applications such as change detection, land cover classification, weather prediction etc. The increase in the demand of satellite images over the band limited channel requires good quality compression tools. Currently, the compression standard developed by Joint Photographic Experts Group (JPEG) is the widely used product...

chapter

UPFC facts devices in power system to improve the voltage profile and enhancement of power transfer loadability

Mithilesh Singh, Shubhrata Gupta

2016 IEEE 1st International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES) > 1 - 4

2016 IEEE 1st International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES)

The expansion of transmission system is more significant due to impact of power transfer capacity of transmission lines on power market transactions but today the new expansion of transmission systems is restricted due to environmental considerations, budgetary problems and potential health effects of electric and magnetic fields. The use of flexible AC transmission system (FACTS) may be cost effective...

chapter

Implementation of symmetrical Multilevel Inverter topology

Shivam Prakash Gautam, Lalit Kumar, Shubhrata Gupta, Nitesh Agrawal

2016 IEEE 1st International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES) > 1 - 6

2016 IEEE 1st International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES)

Multilevel Inverter (MLI) is a key player in high-power high-voltage applications. However, MLI requires large number of semiconductor switches, gate driver circuits and diodes in order to perform its conversion. Besides this, MLI also has a very complex controlling technique. Hence, in order to overcome the above mentioned problems, a new symmetrical topology of MLI is proposed in this paper which...

article

Dense traffic flow patterns mining in bi-directional road networks using density based trajectory clustering

Vaishali Mirge, Kesari Verma, Shubhrata Gupta

Advances in Data Analysis and Classification > 2017 > 11 > 3 > 547-561

Due to the rapid growth of wireless communications and positioning technologies, trajectory data have become increasingly popular, posing great challenges to the researchers of data mining and machine learning community. Trajectory data are obtained using GPS devices that capture the position of an object at specific time intervals. These enormous amounts of data necessitates to explore efficient...

article

Reduction in number of devices for symmetrical and asymmetrical multilevel inverters

Shivam Prakash Gautam, Lalit Kumar Sahu, Shubhrata Gupta

IET Power Electronics > 2016 > 9 > 4 > 698 - 709

Multilevel inverter (MLI) is receiving remarkable recognition due to its reduced voltage stress across the power switches and low total harmonic distortion in output voltage. However, MLI incorporates large number of semiconductor switches and hence increases its complexity. In this study, new structures of symmetrical and asymmetrical MLI are proposed. The proposed structures offer reduced number...

chapter

A novel Type-2 fuzzy directed hybrid post-filtering technique for efficient JPEG image artifact reduction

Vikrant Singh Thakur, Shubhrata Gupta, Kavita Thakur

2016 International Conference on Information Communication and Embedded Systems (ICICES) > 1 - 6

2016 International Conference on Information Communication and Embedded Systems (ICICES)

Image and video compression become very popular and intense field in recent decades, due to fast and high quality communication demand of visual information. Currently, JPEG and JPEG2000 are the most popularly used codec's for achieving image compression. Practically, on the low bit rate compression, it has been observed that the JPEG compressed images suffer from multifarious visual distortions....

article

Hybrid topology of symmetrical multilevel inverter using less number of devices

Shivam Prakash Gautam, Lalit Kumar, Shubhrata Gupta

IET Power Electronics > 2015 > 8 > 11 > 2125 - 2135

The interest in development of newer topologies of multilevel inverter has been increasing rapidly in past few years. Recently introduced topologies achieve higher number of output voltage steps with reduced number of switches, DC voltage sources, voltage stress across switches and losses as compared with the conventional topologies. In this study, a new structure of symmetrical multilevel inverter...

chapter

A modified structure for symmetrical and asymmetrical configuration of multilevel inverter

Shivam Prakash Gautam, Lalit Kumar, Shubhrata Gupta

IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society > 1430 - 1435

IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society

MLI is receiving tremendous popularity due to its reduced voltage stress across switches and low THD in output voltage. MLI incorporates large number of semiconductor switches which increases complexity and reduces efficiency. Therefore, a great deal of attention is paid towards reducing the number of semiconductor switches. The reduction of switch count reduces the size, cost and complexity and enhances...

chapter

New topology with reduced number of switches in asymmetrical cascaded multilevel inverter

Shivam Prakash Gautam, Shubhrata Gupta, Swapnajit Pattnaik, Varsha Singh

Fifth International Conference on Advances in Recent Technologies in Communication and Computing (ARTCom 2013) > 336 - 344

Fifth International Conference on Advances in Recent Technologies in Communication and Computing (ARTCom 2013)

Use of multilevel inverters has been increased rapidly in the recent years, due to its tremendous popularity in reduced voltage stress across power switches and low total harmonic distortion in output waveform. Various topology of multilevel inverter has been proposed. In this paper a new nine level single phase multilevel inverter topology has been presented and comparison is made between proposed...

chapter

Use of genetic algorithms (GA) for optimal coordination of directional over current relays

Dharmendra Kumar Singh, Shubhrata Gupta

2012 Students Conference on Engineering and Systems > 1 - 5

2012 Students Conference on Engineering and Systems (SCES)

In this paper, the optimization of coordination of directional overcurrent relays in an interconnected power system is presented. The objective of protective relay coordination is to achieve selectivity without sacrificing sensitivity and quick fault clearance time. A methodology is adopted for the consideration of backup relays in the optimal coordination of directional overcurrent relays. The calculation...

chapter

Facial expression recognition using facial characteristic points and Gini index

Nazil Perveen, Shubhrata Gupta, Kesari Verma

2012 Students Conference on Engineering and Systems > 1 - 6

2012 Students Conference on Engineering and Systems (SCES)

In this paper, Facial Expression Recognition (FER) system, aid in modeling facial expression space for facial expression recognition by facial characteristic points and Gini index. Facial expression information are mostly concentrated on facial expression information regions, so the, eyes, eyebrows, and mouth are extracted from the input image. When a face image is input the feature extraction is...

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