Direct torque control of AC machines

Direct torque control of AC machines

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The DTC technology has been steadily developed for induction motors initially and now in a mature stage where its adaptation in commercial products has been accepted by industry. The development focus is now toward adaptation of DTC into complex applications requiring special motor types and drive topologies. The various technology areas are special machines for high-speed applications and multiphase machines with more than three-phase windings. There are attempts to extend DTC strategies for advanced drive topologies like matrix converters, multilevel converter topologies, integrated line side converter control. The complexity in such topologies is coming from increased number of voltage vector combinations, which are available for switching, and thus, decision-making can be a complex and time-consuming process. This is typical situation in even more complex multilevel converter fed multiphase machine architecture where the number of voltage vector combinations rises exponentially with machine phase and converter voltage levels.

Chapter Contents:

  • 9.1 Induction motor model
  • 9.2 Two-level inverter voltage vector representation
  • 9.3 DTC control principle
  • 9.3.1 Flux and torque comparator
  • 9.3.2 Optimum switching vector selection
  • Treatment during starting up of the drive
  • 9.3.3 Motor model
  • 9.4 Flux estimation approaches
  • 9.4.1 Use of low-pass filters
  • 9.4.2 Flux estimation with feedback
  • 9.4.3 Application of hybrid flux estimators
  • 9.4.4 Other methods for estimation of stator flux
  • 9.4.5 Speed-sensorless operation
  • 9.5 Simulation of DTC control
  • 9.6 Performance enhancement of classical DTC scheme
  • 9.6.1 Reduction in torque and flux ripple using alternate switching tables
  • 9.6.2 DTC-SVM control [11]
  • 9.6.3 Predictive torque control
  • 9.7 Direct torque control of synchronous motors
  • 9.8 Industrial adaptation of DTC schemes
  • 9.9 Summary
  • List of symbols
  • Glossary of terms
  • References

Inspec keywords: torque control; AC machines; AC motor drives; machine control

Other keywords: multiphase machines; converter voltage levels; direct torque control; induction motors; drive topologies; integrated line side converter control; complex multilevel converter; time-consuming process; multilevel converter topologies; three-phase windings; AC machines; high-speed applications; decision-making; voltage vector combinations; matrix converters; multiphase machine architecture; DTC technology

Subjects: Mechanical variables control; Drives; Control of electric power systems; a.c. machines

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