Proceedings ArticleDOI
Design, Simulation and Comparative Analysis of Control Topologies for Thyristor Power Controllers
Arnab Mondal,P. Velmurugan,S.K. Sharma,R.D. Kulkarni,Manicka Shenoy,K.E Subramanian,M.R.S. Prasad +6 more
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TLDR
The paper proposes a best suited control topology through comparative study to minimize the power consumption and maintenance downtime of reduction process enhancing the overall efficiency of the power system.Abstract:
Every batch of reduction process for zirconium sponge production consumes nearly 4 MWh of energy in the operation of heaters. The heating circuit of reduction furnaces generally divided into four zones, each consists of nichrome heating elements fed by 3 phase, 415 Volts, 50 Hz AC supply. The process temperature is maintained by switching the state of these heating elements at specific intervals incorporating ON/OFF controller, using power contactors of suitable rating. However, in view of certain drawbacks of ON/OFF control system, thyristor power controllers have been proposed based on either phase angle control technique or integral cycle control topology. The paper presents the design schematic of these two control topologies and subsequently performs the circuit simulation to evaluate the parametric performance. The simulation results are also highlighted in the paper. The comparative analysis of phase angle control topology with integral cycle control scheme has been presented to find out the best temperature control strategy to keep the retort temperature within certain optimal limits. The FFT analysis of electrical parameters including total harmonic distortion, power factor and input waveforms has been discussed to meet the limits of IEEE: 519–1992. The paper also proposes a best suited control topology through comparative study to minimize the power consumption and maintenance downtime of reduction process enhancing the overall efficiency of the power system.read more
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Dissertation
Elaboration de zirconium par réduction de tétrachlorure de zirconium par magnésothermie : étude expérimentale et modélisation
TL;DR: In this paper, the plupart du zirconium produit industriellement is elabore selon le procede kroll which consiste a reduire du tetrachlorure de zirconsium par du magnesium suivant the reaction globale : zrcl 4 + 2mg = zr + 2 mgcl 2 cet.
Proceedings ArticleDOI
Design and Simulation of Digitally Controlled High Current Thyristor Rectifier for Nuclear Research
TL;DR: The paper presents design considerations and circuit simulation of digitally controlled high current, six pulse thyristor rectifier system used for powering Fuel Rod Cluster Simulator of thermal hydraulic experimental R&D facilities for simulating temperature and power transients expected in nuclear reactor.
Proceedings ArticleDOI
Investigation of Power Factor Improvement for Non-Linear Furnace Inverter
TL;DR: In this paper , a model investigation and analysis are carried out to combine a active power factor correction and active hybrid filters to get the best outcomes for better furnace inverter performance to the electrical grid.
References
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Journal ArticleDOI
The impact of switching strategies on power quality for integral cycle controllers
TL;DR: In this article, an innovative concept of group frequencies is discussed for the management of power quality issues in terms of selecting the controller switching strategy for load power control in an integrated cycle controller.
Journal ArticleDOI
Thyristor Control of Resistive and Series DC Motor Loads Using Integral-Cycle Switching
William Shepherd,P. J. Gallagher +1 more
TL;DR: In this article, a rectifier integral-cycle pulses of current were obtained from a single-phase supply using a pair of inverse-parallel connected thyristors and a diode bridge.
Proceedings ArticleDOI
Comparison Analysis of AC Voltage Controllers Based on Experimental and Simulated Application Studies
Hamdy A. Ashour,R. A. Ibrahim +1 more
TL;DR: Experimental and simulation results have been obtained and well correlated, showing the effectiveness of such configurations in the fields of control of reactive power flow and in the field of controlling the starting performance of three phase induction motor.
Journal ArticleDOI
A new study of laminar natural convection in two concentric vertical cylinders
TL;DR: In this paper, the local and average Nusselt numbers correlations of interest in determining the insulating value of an annular cavity formed by two concentric vertical cylinders have been obtained.
Journal ArticleDOI
Three-phase circuits with voltage control by integral-cycle single-phase mode triggering of thyristors
M. T. Lazim,William Shepherd +1 more
TL;DR: In this article, the feasibility of using thyristor control with integral-cycle triggering with balanced three-phase series RL loads was investigated to consider the feasibility and performance of using a four-wire star-connected load and a branch-delta connection.