A proposal for the study of voltage sag in isolated synchronous generators caused by induction motor start-up

Abstract This study presents a proposal based on controlled capacitor switching at the moment of three-phase induction motor start-up, when such motors are fed by isolated synchronous generators. This procedure allows for the mitigation of voltage sag that occurs during this transitory period, since a large portion of the reactive power requested during the motor start-up is provided by capacitor banks, thereby relieving a portion of current from the synchronous generator, and with it mitigating the voltage sag. Traditionally, oversizing of the generator was used, under the pretext of mitigating voltage sag. This proposal represents not only an economy, but also power optimization, developed through the motor-generator group, leading to a greater working life.

[1]  R. H. Park,et al.  The Reactances of Synchronous Machines , 1928, Transactions of the American Institute of Electrical Engineers.

[2]  Yoshihide Hase.  Handbook of Power Systems Engineering with Power Electronics Applications , 2012 .

[3]  Pedro Nunes,et al.  Induction Motor Response to Voltage Dips , 2006 .

[4]  Bernard F. Kolanowski.  Small-Scale Cogeneration Handbook , 2000 .

[5]  C. A. Nickle,et al.  Synchronous machines I — An extension of Blondel's two-reaction theory , 1926, Journal of the A.I.E.E..

[6]  R. H. Park,et al.  Two-reaction theory of synchronous machines generalized method of analysis-part I , 1929, Transactions of the American Institute of Electrical Engineers.

[7]  Jeffrey H. Lang,et al.  Motors and Generators , 2009 .

[8]  Prado Wellington,et al.  Comparative performance analysis of a standard three-phase induction motor and an asymmetric three-phase induction motor fed from a single-phase network , 2015 .

[9]  Luis Sainz,et al.  Characterization of non-linear load behavior , 2008 .

[10]  Ion Boldea,et al.  The Induction Machine Handbook , 2001 .

[11]  George J. Wakileh.  Harmonics in rotating machines , 2003 .

[12]  Paul G. Cummings,et al.  Estimating Effect of System Harmonics on Losses and Temperature Rise of Squirrel-Cage Motors , 1986, IEEE Transactions on Industry Applications.

[13]  B. Singh,et al.  Application of DSTATCOM for Mitigation of Voltage Sag for Motor Loads in Isolated Distribution Systems , 2006, 2006 IEEE International Symposium on Industrial Electronics.

[14]  F. De Rosa,et al.  Shaft torsional vibration due to non-linear loads in low capacity turbine units , 2001 .

[15]  Elham B. Makram,et al.  Starting transients of induction motors connected to unbalanced networks , 1989 .

[16]  Kenneth C. Ludema,et al.  A qualitative empirical model of cylinder bore wear , 1999 .

[17]  A. David Graham,et al.  Line Harmonics of Converters with DC-Motor Loads , 1983, IEEE Transactions on Industry Applications.

[18]  Esmat H. Badawy.  Performance of a synchronous generator with bridge rectified output , 1984 .

[19]  U. G. Knight,et al.  Power Systems in Emergencies: From Contingency Planning to Crisis Management , 2001 .

[20]  D. Shmilovitz,et al.  On the definition of total harmonic distortion and its effect on measurement interpretation , 2005, IEEE Transactions on Power Delivery.