Modeling and stability analysis of three- and six-phase asymmetrical grid-connected induction generator
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ORIGINAL PAPER
Modeling and stability analysis of three- and six-phase asymmetrical grid-connected induction generator Arif Iqbal1
· Girish Kumar Singh2
Received: 19 May 2020 / Accepted: 29 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2021
Abstract This paper presents the development of linearized model of asymmetrical six-phase grid-connected induction generator (GCIG) for small-signal stability. The developed linearized model has been used to obtain the eigenvalue to evaluate generator stability with respect to parameter variation of the machine in comparison with its three-phase counterpart. During the analysis, suitability of six-phase induction generator for higher output power has been accessed. Instability tendency during low electrical output power can be avoided through closed loop operation of the machine. Hence, the indirect field-oriented control scheme for asymmetrical six-phase GCIG has been proposed for stable operation with higher reliability. The key analytical results have been demonstrated with its experimental validation. Keywords Stability analysis · Grid-connected induction generator · Six-phase induction machine · Closed loop operation · Wind power generation
1 Introduction In the today’s era of science and technology, research focus is concentrated on renewable power generation such as solar power, wind energy power generation (WEPG), hydro and tidal energy, etc., which not only reduce the dependency on limited amount of fossil fuel, but also have positive environmental impact [1]. Moreover, the renewable energy also offers some more attractive advantages such as its free availability, pollution free with its economic viability through mature available technology. Among the various option of renewable energies, it is the sector of wind energy conversion system, where the industries are competing with the heavily subsidized traditional power generation technologies. Globally, more than 52 GW wind power has been extracted up to 2017, with the installed capacity of 539 GW. According to the updated record of Global Wind Energy Council (GWEC), the annual market will continue with the rapid growth after 2018, particularly in Europe, India together with offshore sector [2].
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Arif Iqbal [email protected]
1
Department of Electrical Engineering, Rajkiya Engineering College Ambedkar Nagar, Akbarpur, India
2
Department of Electrical Engineering, Indian Institute of Technology Roorkee, Roorkee, India
AC machines (synchronous or asynchronous) are vital component of the wind and hydro-energy systems. Squirrel cage induction machine possesses various advantages in comparison with others, important of which is its rugged construction, robust operation, lower maintenance and cost effectiveness [3]. Hence, induction machines are now preferably used as generator in place of other machines, particularly synchronous generator [4, 5]. Generator employed in power generation is usually a three-phase. But nowadays, researchers are focusing toward the use of multiphase machin
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