Abstract
The current paper discusses the adaptive choice of a filter time constant for filtering the steady-state flux reference in the energy-efficient control problem of field-orientation induction machines in transient behavior when load and speed conditions are changing taking into account the effect of the main induction saturation. It is shown that by appropriately managing the flux linkage rate of change the energy losses per full operation cycle under torque changes can be significantly reduced compared to the conventional cases. The analysis for the appropriate choice of the filter time constant as a fraction of the rotor time constant is based on a numerical study and simulation results for three different induction machines with different rated powers.
Highlights
Statement of the problem and analysis of the recent research and publications
The motivation is to give a simple and easy implementable solution to the problem of energy consumption minimization, which is characterized by a continuity of action, converges to the optimal flux level in the steadystate and expresses a compromise approach to the problem with changing loads in dynamics as well as provide an alternative solution to model predictive control [6]
An induction machine operated with high dynamics is controlled as a rule via a field-oriented scheme
Summary
Statement of the problem and analysis of the recent research and publications. The induction machine is widely used in industrial applications due to its robustness and its low cost compared to permanent magnet synchronous machines. The full model has four state variables: field-producing current i1d, torque-producing current i1q, rotor flux Ψ2, and motor speed ω2; and two controls: the stator voltage phasor components u1d and u1q.
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