Abstract
This paper presents a DSP based implementation of simple and very useful control algorithm for the real-time efficiency optimization of the indirect vectorcontrolled induction motor drives. Conventional field-oriented induction motor drives operate at rated flux even at low load. To improve the efficiency of the existing induction motors, it is important to regulate the magnetization flux of the motor in the desired operating range. This paper presents techniques for minimizing power loss (the copper and core losses) of induction motor based on determination of an optimum flux level for the efficiency optimization of the vector-controlled induction motor drive. An induction motor (IM) model in d-q coordinates is referenced to the rotor magnetizing current. Thus the decomposition into d-q components in the steady-state motor model can be utilized in deriving the motor loss model. The algorithm offers a fast convergence. The complete closed loop vector control of the proposed LMC-based IM drive is successfully implemented in real-time using digital signal processor DSP TMS320LF2812 for 1HP motor induction motor. The close agreement between the simulation by Matlab/Simulink and the experimental results confirms the validity and usefulness of the proposed techniques. The proposed LMC in a comparison with conventional FOC can reduce total losses from 5% to 67.2% for all load ranges.
Highlights
Produced worldwide is used by motors, mainly induction motors, which constitute around Environmental concerns, increasing energy demand, and limited resources have driven efficiency improvement in all aspects of electrical engineering
The complete closed loop vector control of the proposed loss-model-based controller (LMC)-based IM drive is successfully implemented in real-time using digital signal processor DSP TMS320LF2812 for 1HP motor induction motor
It is found from the results that the performance of the drive with the proposed LMC has been improved in terms of power saving as compared to a conventional FOC
Summary
Produced worldwide is used by motors, mainly induction motors, which constitute around Environmental concerns, increasing energy demand, and limited resources have driven efficiency improvement in all aspects of electrical engineering. Operation with rated flux causes low efficiency at light load [2]. Converter loss and motor loss are still greatly dependent on control strategies, especially when the motor operates at light load. In transitional motor control the core losses and magnetizing-currentinduced stator copper loss are almost constant, so, at light load, the motor efficiency decreases drastically. At light loads, rated flux operation causes excessive core loss, impairing the efficiency of the drive. Since drives operate at light load most of the time, optimum efficiency can be obtained by programming the flux [2]. This paper presents loss-model-based controller (LMC) for minimizing power loss of induction motor and an approach of simultaneously optimizing the efficiency of induction-motor drives and selecting flux reference through the minimization of the copper and core losses while ensuring high dynamic. The loss-model-based controller based induction motor (IM) drive is implemented in real time for 1HP induction motor using digital signal processor DSP TMS320LF2812
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