Intensification of Transient Stability in Grid Connected Squirrel Cage Induction Generator Using Plugging Mode Operation

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2017 by IJETT Journal
Volume-44 Number-3
Year of Publication : 2017
Authors : C.Tamilselvi, G.Hemalatha, R.Geetha, Devika
DOI :  10.14445/22315381/IJETT-V44P221


C.Tamilselvi, G.Hemalatha, R.Geetha, Devika "Unified Framework for Energy Monitoring and Demand Based Optimization for Commercial Buildings – IoT based Enterprise Implementation and Beyond", International Journal of Engineering Trends and Technology (IJETT), V44(3),102-106 February 2017. ISSN:2231-5381. published by seventh sense research group

Over the past few decades, there has been an increasing use of induction generator particularly in wind power applications. In generator operation, a prime mover (turbine, engine) drives the rotor above the synchronous speed. Stator flux still induces currents in the rotor, but since the opposing rotor flux cuts the stator coils, active current is produced in stator coils, and motor operates as a generator, and sends power back to the electrical grid. This work investigates a new method for improving the transient stability of power systems equipped with squirrel cage induction generators. For stability improvement, the unique property of the induction machines which is the possibility of reversing the direction of the rotating flux is employed. In this work, after clearing the fault, operating mode of the induction machine is changed from the generating to the plugging mode for a short time. This leads to opposition between the rotating flux and mechanical torques, thus preventing the generator from further acceleration. Simulation results show that the proposed method can be effective in improving the transient stability.


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Transient Stability, Rotating flux, Plugging mode.