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Rao L.N.,P.A. College | Gairola S.,NIET
International Conference on Energy Economics and Environment - 1st IEEE Uttar Pradesh Section Conference, UPCON-ICEEE 2015 | Year: 2015

The main challenge in control of photovoltaic (PV) power system is to operate at maximum efficiency. The I-V characteristics of PV system are non-linear, which makes it difficult to track the maximum power at varying Insolation and temperature. In this paper a 50W photovoltaic module based system is investigated for its control characteristics. The operating characteristics is studied with the focus on control of boost converter to achieve maximum power point tracking by Perturbation and Observation method uniquely used with PI controller. The performance analysis of this system based model is simulated and presented for MPP operation by applying the control technique to a boost converter highlighting the issues in its control. The simulation results are obtained and plotted for varying insolation level between 50 % and 100 % for validation. © 2015 IEEE. Source


Gupta R.,Thapar University | Gairola S.,NIET
2015 2nd International Conference on Recent Advances in Engineering and Computational Sciences, RAECS 2015 | Year: 2015

This paper presents a technique of PID controller tuning for fractional order industrial process and proposes a Time-Response Specification Based Fitness (TRSBF) function required by Particle Swarm Optimization (PSO) for the controller tuning. The results are compared with the conventional Integral Time Absolute Error (ITAE) based and analytic controllers. The performance and robustness is analyzed in time-domain and frequency-domain to establish the suitability of proposed fitness function. MATLAB/Simulink has been employed for PSO based tuning algorithm validation and comparison of parameters like peak overshoot, settling time, disturbance rejection time, stability in frequency domain, etc. © 2015 IEEE. Source


Srivastava V.K.,NIET | Prajapati Y.K.,Motilal Nehru National Institute of Technology | Singh V.,Banaras Hindu University | Saini J.P.,BIET
Microwave and Optical Technology Letters | Year: 2015

An efficient study is performed to modify the propagation characteristics of Bragg waveguide using plasma filled core. The proposed Bragg waveguide consists of a low index central region having plasma surrounded by a large number of periodic cladding layers of dielectric with alternating high and low refractive indices. The effect of plasma filled core of proposed waveguide on chromatic dispersion, radiation loss, and effective area is studied. This analysis shows that introducing plasma in the core region of proposed waveguide is a key to achieve higher effective area with small radiation loss. Hence, a trade-off exists between low radiation loss and high effective area in the proposed waveguide. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2491-2496, 2015 © 2015 Wiley Periodicals, Inc. Source


Singh B.,National Institute of Technology Kurukshetra | Kumar J.,National Institute of Technology Kurukshetra | Kumar S.,NIET
Materials and Manufacturing Processes | Year: 2014

In this study, machining of AA6061/10%SiC composite fabricated by mechanical stir casting process has been experimentally investigated using electrodischarge machining (EDM) process with tungsten-powder-mixed dielectric fluid (PMEDM). Peak current, pulse on-time, pulse off-time, and gap voltage are selected as machining parameters. Mathematical relation has been established for response quality characteristics like surface roughness with and without tungsten powder dielectric fluid using Central Composite Rotatable Design (CCRD) through response surface methodology (RSM). Surface characteristics like microhardness, surface topography, and white recast layer have been evaluated through scanning electron microscope (SEM), electrodispersive X-ray spectroscopy (EDS), and micro-Vicker hardness. Results have also been compared with simple EDM of AA6061/10%SiC composite without powder-mixed dielectric fluid. The existence of tungsten powder in dielectric fluid increases surface quality owing to decrease in number, size, and depth of craters formed while machining. Thickness of white recast layer is reduced whereas surface hardness is increased when machined with powder-mixed EDM. © 2014 Copyright Taylor & Francis Group, LLC. Source


Rao L.N.,P.A. College | Gairola S.,NIET
International Conference on Electrical, Electronics, Signals, Communication and Optimization, EESCO 2015 | Year: 2015

In photovoltaic power system, both photovoltaic (PV) module and switch-mode converters show non-linear and time variant characteristics which make it difficult to be analyzed and controlled. In this paper a 50W photovoltaic module is investigated for its design and control characteristics. The operating characteristic is studied and PV model parameter estimation is carried out using Particle Swarm Optimization (PSO) technique. The unknown parameters like series resistance, shunt resistance and reverse saturation current are estimated using PSO that do not involve assumptions. At the same time the operating range estimation of power converter is also suggested using PSO. The performance analysis of this estimated parameter based model is presented for constant power operation by applying suitable control technique to a boost converter. The results from identified parameter based module are obtained and plotted for varying insolation conditions between 20 % and 100 % for validation. © 2015 IEEE. Source

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