Motilal Nehru National Institute of Technology

www.mnnit.ac.in
Allahabad, India

Motilal Nehru National Institute of Technology Allahabad , formerly Motilal Nehru Regional Engineering College , is a public higher education institute located in Allahabad, Uttar Pradesh, India. It is one of the National Institutes of Technology, and like the rest of them, classified as an Institute of National Importance.In the survey carried out by ET Now-Economic Times jointly, MNNIT Allahabad was declared as the best engineering institution of North India and ranked No.1 in overall ranking. It is also ranked 3rd in all 30 NIT's, and no. 1 NIT of North India. The college has distinction of being first in the country to start an undergraduate programme in Computer Science & Engineering in 1976-77. Wikipedia.

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Kar H.,Motilal Nehru National Institute of Technology
Digital Signal Processing: A Review Journal | Year: 2010

A novel criterion for the global asymptotic stability of two-dimensional (2-D) discrete systems described by the Roesser model employing saturation arithmetic is presented. The criterion is compared with previously reported criteria. Numerical examples showing the effectiveness of the present criterion are given. © 2010 Elsevier Inc. All rights reserved.


Perveen R.,Motilal Nehru National Institute of Technology | Kishor N.,Motilal Nehru National Institute of Technology | Mohanty S.R.,Motilal Nehru National Institute of Technology
Renewable and Sustainable Energy Reviews | Year: 2014

Offshore wind farm (OWF) is an emerging technology in the wind energy conversion system. These wind resources are abundant, stronger, and are more consistent in terms of their availability than land-based wind resources. As a matter of fact significantly higher energy production is achieved due to larger wind turbine ratings and stronger wind profiles. This paper highlights the present scenario and challenges in development of offshore wind power. The challenges and opportunities that exist in the development stages of an offshore wind farm project, from exploration to erection and installation of wind turbines, construction of platforms and laying of sea cables, up to maintenance and de-commissioning, involving important technical aspects are addressed. An application of high voltage direct current (HVDC) transmission for integration of large scale offshore wind farm with onshore grid is attractive as compared to high voltage alternating current (HVAC) transmission system. To make the offshore wind farm feasible, reliable and secure, the different aspects in its planning, design and operation are also reviewed in this paper. © 2013 Elsevier Ltd.


Shukla R.D.,Motilal Nehru National Institute of Technology | Tripathi R.K.,Motilal Nehru National Institute of Technology
Renewable and Sustainable Energy Reviews | Year: 2014

This paper presents a new speed-sensorless control strategy for a stand-alone doubly-fed induction generator supplying energy to an isolated load. The method is based on the root mean square (rms) detection scheme. The generated stator voltage is controlled via rotor currents. Amplitude of stator voltage and its frequency are controlled simultaneously. The output signals from the voltage controllers are the reference signals for the rotor current amplitude and frequency of the stator voltage is regulated with the help of frequency control loop. This developed direct voltage control method is applicable for both the balanced and unbalanced load and also for standalone and grid connected mode. The control pulses for the rotor side converter is supplied by the hysteresis controller which is operated on the error signal calculated between actual and reference rotor currents. This paper also provides the brief idea about the voltage and frequency control on modern Autonomous DFIG based Wind Energy Systems via single phase mathematical model of standalone DFIG system. A short state-of-the-art review on mechanical position/speed sensorless control schemes for autonomous DFIG based WESs is presented, which helps the present researcher and students working in this area. These include stator flux oriented control techniques; direct voltage control techniques; MARS observer based techniques for autonomous DFIG-based variable-speed WESs. Simulation results obtained from a 2MVA DFIG system, prototype in MATLab/Simulink, are presented and discussed in this paper. © 2014 Elsevier Ltd.


Kar H.,Motilal Nehru National Institute of Technology
Signal Processing | Year: 2011

A novel criterion for the global asymptotic stability of fixed-point state-space digital filters under various combinations of quantization and overflow nonlinearities is presented. The criterion is compared with a previously reported criterion. © 2011 Elsevier B.V. All rights reserved.


Tripathy M.,Motilal Nehru National Institute of Technology
Simulation Modelling Practice and Theory | Year: 2010

Many methods have been used to discriminate magnetizing inrush from internal faults in power transformers. Most of them follow a deterministic approach, i.e. they rely on an index and fixed threshold. This article proposes two approaches (i.e. NNPCA and RBFNN) for power transformer differential protection and address the challenging task of detecting magnetizing inrush from internal fault. These approaches based on the pattern recognition technique. In the proposed algorithm, the Neural Network Principal Component Analysis (NNPCA) and Radial Basis Function Neural Network (RBFNN) are used as a classifier. The principal component analysis is used to preprocess the data from power system in order to eliminate redundant information and enhance hidden pattern of differential current to discriminate between internal faults from inrush and over-excitation condition. The presented algorithm also makes use of ratio of voltage-to-frequency and amplitude of differential current for detection transformer operating condition. For both proposed cases, optimal number of neurons has been considered in the neural network architectures and the effect of hidden layer neurons on the classification accuracy is analyzed. A comparison among the performance of the FFBPNN (Feed Forward Back Propagation Neural Network), NNPCA, RBFNN based classifiers and with the conventional harmonic restraint method based on Discrete Fourier Transform (DFT) method is presented in distinguishing between magnetizing inrush and internal fault condition of power transformer. The algorithm is evaluated using simulation performed with PSCAD/EMTDC and MATLAB. The results confirm that the RBFNN is faster, stable and more reliable recognition of transformer inrush and internal fault condition. © 2010 Elsevier B.V. All rights reserved.


A recently reported criterion [Singh V. (2010). Modified criterion for global asymptotic stability of fixed-point state-space digital filters using two's complement arithmetic. Automatica, 46, 475478], which is a modified version of an earlier criterion due to MillsMullisRoberts, for the global asymptotic stability of fixed-point state-space digital filters with two's complement arithmetic is reviewed. Pertaining to second-order digital filters, it is shown that Singh's approach will never lead to a larger overflow stability region in the parameter space as compared to that obtainable via MillsMullisRoberts criterion. © 2010 Elsevier Ltd. All rights reserved.


Gupta R.,Motilal Nehru National Institute of Technology
IEEE Transactions on Power Electronics | Year: 2012

In this paper, a generalized frequency domain method is proposed to obtain the switching frequency formulation for hysteresis current controlled voltage source inverter (VSI)-based shunt compensator. The formulation obtained from the high-frequency model based on the Tsypkin's method explicitly shows the relation between the maximum switching frequency with the system and design parameters. The shunt compensator has been used for the load compensation in a distribution system for both weak and strong feeder supplying a nonlinear load. The maximum switching frequency has been shown related with hysteresis bandwidth and parameters of the VSI, feeder, and load of the distribution system. It is shown that the feeder and load reactance has a significant effect in determining the maximum switching frequency for the weak feeder distribution systems. However, the maximum switching frequency is mainly dependent upon the shunt compensator parameters for strong feeder distribution systems. The minimum switching frequency in general depends upon the modulation depth of the VSI. The results are verified using as power systems CAD (PSCAD) simulation studies for single-phase load compensation. A laboratory model distribution system has been used for the experimental verification. © 2006 IEEE.


Gautam S.,Motilal Nehru National Institute of Technology | Gupta R.,Motilal Nehru National Institute of Technology
IEEE Transactions on Power Electronics | Year: 2014

In this paper, a generalized expression of the switching frequency is obtained for the cascaded H-bridge multilevel inverter tracking a reference current. The inverter is considered connected to the grid and operates in current control mode using the generalized algorithm of multiband hysteresis modulation. The results are derived based on the time-domain current error dynamics which is applicable for any levels of the cascaded multilevel inverter. The generalized expression explicitly shows the relationship between the instantaneous switching frequency with the net hysteresis band, system parameters, and number of levels. The expression can be used for the determination of the net hysteresis band required for a given desired effective maximum switching frequency for the multiband hysteresis modulation. The value of maximum, minimum, and average switching frequencies can be obtained from the instantaneous switching frequency expression. The results are useful for the design of the multiband hysteresis controller for tracking of the desired reference current and can be used to evaluate the performance characteristics of the multilevel inverter. The simulation and experimental verification of the results are obtained through single-phase, three-and five-level cascaded H-bridge inverters. © 2013 IEEE.


Pandey S.K.,Motilal Nehru National Institute of Technology | Mohanty S.R.,Motilal Nehru National Institute of Technology | Kishor N.,Motilal Nehru National Institute of Technology
Renewable and Sustainable Energy Reviews | Year: 2013

In this paper an extensive literature review on load-frequency control (LFC) problem in power system has been highlighted. The various configuration of power system models and control techniques/strategies that concerns to LFC issues have been addressed in conventional as well as distribution generation-based power systems. Further, investigations on LFC challenges incorporating storage devices BESS/SMES, FACTS devices, wind-diesel and PV systems etc have been discussed too. © 2013 Elsevier Ltd.


Kar H.,Motilal Nehru National Institute of Technology
Signal Processing | Year: 2012

A new criterion for the global asymptotic stability of two-dimensional (2-D) state-space digital filters described by the Roesser model employing twos complement overflow arithmetic is presented. The criterion is compared with a previously reported criterion. © 2012 Elsevier B.V. All rights reserved.

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