Implementation Of A New Fast Direct Torque Control Algorithm For Induction Motor Drive
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Implementation of a new fast direct torque control algorithm for induction motor drive.
Neha D.Bais
Mtech IPS in Electrical Engineering
G.H.Raisoni college of Engineering ,Nagpur
Email- nehabais84@gmail.com
J.G.Chaudhari
Asst Prof Electrical Engineering
G.H Raisoni college of Engineering, Nagpur.
Email- jagdish.choudhari@raisoni.net
Abstract- The abstract DTC system used for controlling of Induction motor gives robust as well as gives a high dynamic performance.However it has two major drawbacks .The first one is the variation of switching frequency in accordance with the amplitude of the hysteresis bands and the motor operating speed ,also the selection of voltage vectors is not optimized inside the flux hysteresis band to…show more content… It is the simplest technique ,with good dynamic performance , robust and gives large benefits. It is recognized as an alternative method to field oriented control (FOC). Industrial drives with DTC are present in the market today.DTC is proposed to control electromagnetic torque and stator flux by directly modifying the stator voltage in accordance with the torque and flux errors DTC has added advantages over FOC absence of mechanical transducer, no requirement of co-ordinate transformation ,and a very simple control scheme with less computational time Though DTC is simple and have fast transient response, it generates high level common mode voltage variations. To avoid the problems of common mode voltage variations a new DTC algorithm was developed, in which, only odd or only even voltage vectors will be applied in each sector in which stator flux lies without using any zero voltage vectors. However, this method gave torque ambiguity. To overcome the torque ambiguity, modified DTC algorithm has been proposed The variable switching technique is a part of the conventional DTC technique . It was firstly introduced by Takahashi and Noguchi around 1980’s this method is the wide band of the switching frequency of the inverter even when the flux and torque references are kept constant. The conventional DTC scheme has some inherent