MWh AND MVARh SAVING IN THREE PHASE INDUCTION MACHINE USING STAR-DELTA SWITCHING SCHEMES WITH SPWM

Ramesh Daravath , Paka Sindhura

Real and Reactive power saving, case study of induction machine, phase controlled anti parallel thyristor bank, star-delta stator winding, SPWM, harmonics, predetermined values

ABSTRACT: Induction machines are the most commonly used industrial drives for variety of applications. In this paper, it has been demonstrated that the star-delta switching of stator winding of three-phase induction machine (motor / generator operations) reconnected in star at suitable reduced loads with a switching arrangement, can result in improved efficiency and power factor, as compared to a fixed delta or star connection. In such star-delta stator switching scheme, only two voltage settings are possible for the operation of the three-phase induction machine i.e. line voltage for normal operation (delta-connection) and (line voltage / 3) for reduced load conditions (star-connection). Hence, a Sinusoidal Pulse-Width-Modulated (SPWM) inverter is proposed to employ for feeding a variable voltage applied to the three-phase induction machine. In this context, a method has been evolved to find the optimum voltage fed to the induction machine for the improved performance. A case study on a 250 kW, 400 V, 4-pole, three-phase induction machine, operated with different load cycles, reveals the significant real and reactive power savings that could be obtained in the present proposal. In addition, for feeding the variable voltage to the induction machine, power and control circuit have been designed and fabricated in the laboratory. Experiments have been conducted and the results are presented. A MATLAB program has been developed for the predetermination of performance of the three-phase induction machine using exact equivalent circuit.

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"MWh AND MVARh SAVING IN THREE PHASE INDUCTION MACHINE USING STAR-DELTA SWITCHING SCHEMES WITH SPWM", IJSDR - International Journal of Scientific Development and Research (www.IJSDR.org), ISSN:2455-2631, Vol.2, Issue 3, page no.52 - 59, March-2017, Available :https://ijsdr.org/papers/IJSDR1703009.pdf

Volume 2 Issue 3, March-2017

Pages : 52 - 59

Paper Reg. ID: IJSDR_170074

Published Paper Id: IJSDR1703009

Downloads: 000347214

Research Area: Engineering

Country: Hyderabad, Telangana, India

Published Paper PDF: https://ijsdr.org/papers/IJSDR1703009

Published Paper URL: https://ijsdr.org/viewpaperforall?paper=IJSDR1703009

ISSN: 2455-2631 | IMPACT FACTOR: 9.15 Calculated By Google Scholar | ESTD YEAR: 2016

An International Scholarly Open Access Journal, Peer-Reviewed, Refereed Journal Impact Factor 9.15 Calculate by Google Scholar and Semantic Scholar | AI-Powered Research Tool, Multidisciplinary, Monthly, Multilanguage Journal Indexing in All Major Database & Metadata, Citation Generator

Publisher: IJSDR(IJ Publication) Janvi Wave

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