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Energy model based loss‐minimized speed control of induction motor with a full‐order observer
Author(s) -
Mannan Mohammad Abdul,
Murata Toshiaki,
Tamura Junji,
Tsuchiya Takeshi
Publication year - 2006
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.20008
Subject(s) - control theory (sociology) , observer (physics) , vector control , induction motor , slip (aerodynamics) , controller (irrigation) , energy (signal processing) , computer science , engineering , mathematics , voltage , control (management) , physics , agronomy , statistics , quantum mechanics , artificial intelligence , aerospace engineering , electrical engineering , biology
In this paper, a loss‐minimization algorithm is developed to achieve maximum efficiency in terms of slip frequency. The optimal value of slip frequency can be obtained by minimizing all controllable losses of the induction motor (IM). The ratio of magnetic energy converted to torque ( W T ) to magnetic energy stored in the rotating field ( W q ) is defined in terms of slip frequency to obtain an error function that is used to design a controller to achieve the desired speed. Since the energy model of the IM can be expressed by the multi‐input and multi‐output (MIMO) system, an MIMO optimal regulator is proposed to achieve the desired speed with maximum efficiency. To design an optimal regulator, it is necessary to measure all state quantities. But W T and W q cannot be measured directly. Therefore, a full‐order observer is proposed to estimate these state quantities. The gains of the observer system are calculated by using the pole placement technique. Consequently, the observer system becomes stable. The performance of the proposed controller and observer system are verified by using simulation. With regard to the simulation results, it can be concluded that the desired speed can be achieved by using the proposed controller and the unknown state quantities can be estimated properly by using the proposed observer system. © 2006 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.