Sensorless control of IM drives

Sensorless control of IM drives

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This chapter addresses the fundamental issues of sensorless vector control of induction motor drives. Starting from an historical overview of induction motor control in general, we revisit the two archetypical flux estimators known as the current model and voltage model, as well as their combination into a reduced-order observer. It is demonstrated not only that how speed estimation can be added to the observer but also how the flux estimator can be made inherently sensorless, i.e. the rotor speed no longer appears in the estimator equations. It is shown that all inherently sensorless flux estimators that are based on the reduced-order observer resemble a variant of the voltage model, called the statically compensated voltage model. Finally, theory is developed whereby the coefficients of the inherently sensorless flux estimator can be selected so that stability is obtained for all operating conditions, called complete stability. This includes the low-speed regeneration region where often instability phenomena tend to occur.

Chapter Contents:

  • 13.1 Introduction
  • 13.2 Essentials of sensorless vector control
  • 13.2.1 IM model and nomenclature
  • 13.2.2 Dynamic model and principle for vector control
  • 13.3 Flux estimation in DFO
  • 13.3.1 Current model
  • 13.3.2 Voltage model
  • 13.3.3 Statically compensated VM
  • 13.3.4 Combination of CM and VM
  • 13.3.5 Reduced-order observer
  • 13.3.6 Speed estimation
  • 13.4 Flux estimation in IFO
  • 13.4.1 Current model
  • 13.4.2 Reduced-order observer
  • 13.4.3 Voltage model
  • 13.4.4 Statically compensated VM
  • 13.4.5 Speed estimation
  • 13.4.6 Inherently sensorless reduced-order observer
  • Inherently sensorless reduced-order observer recast as SCVM
  • Inherently sensorless CM
  • 13.4.7 Speed estimation in an inherently sensorless scheme
  • 13.5 Design for complete stability
  • 13.6 Examples
  • 13.6.1 Inherently sensorless reduced-order observer and SCVM
  • 13.6.2 Sensorless CM
  • Inherently sensorless CM
  • 13.6.3 Simulations
  • 13.7 Conclusion
  • List of symbols
  • Glossary of terms
  • References

Inspec keywords: induction motor drives; sensorless machine control; stability; reduced order systems; observers

Other keywords: instability phenomena; statically compensated voltage model; reduced-order observer; archetypical flux estimators; estimator equations; induction motor drives; sensorless vector control; induction motor control; speed estimation; current model; rotor speed; low-speed regeneration region; IM drives

Subjects: Asynchronous machines; Simulation, modelling and identification; Control of electric power systems; Stability in control theory

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