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Modeling and Simulation of a Scalar Controlled Induction Motor Using Combined Inverter Machine Interaction in State Space

Small displacement equations valid for small excursions about an operating point are established from the machine equations expressed in synchronously rotating reference frame. The conventional form of d-q model used for drive simulation has limitations in predicting the machine performance. It is possible that, accurate results for fundamental component of current and average torque near rated operating conditions are possible. This paper presents the modeling and simulation of inverter along with the induction motor in the synchronously rotating reference frame. Analysis of a state space model of inverter and induction motor drive system in synchronously rotating reference frame under variable speed control is given. This enables to determine the performance of variable speed drive with inverter in a closed loop which can be used for stability studies. The performance of this proposed scheme is presented by simulation in MATLAB/SIMULINK.