Modeling and Estimation of Core Losses for Doubly-fed Wound Rotor Induction Machine KRISHNA ROY, AGNIPROTIM SEN,  DEBASHIS...
Introduction <ul><li>Sensorless rotor flux oriented control (RFOC) of induction machines </li></ul><ul><li>Difficulties at...
Double Inverter Fed Induction Motor
Doubly Fed Induction Motor  MODE I MODE II MODE III MODE IV 0 -m1pu m1pu Torque Speed - ω 1PU - ω 2PU ω 1PU ω 2PU
Doubly-Fed Wound Rotor Induction Machine Modeling
Proposed Core loss Model
Equivalent Circuit <ul><li>steady state equivalent circuit for the wound rotor machine with both stator and rotor side exc...
Modified Equivalent Circuit <ul><li>dynamic equivalent circuit for the wound rotor machine with both stator and rotor side...
Rotor and Stator Frequency Reference
Results
Conclusion <ul><li>V/f-type direct frequency control can be applied on the rotor side  </li></ul><ul><li>normal direct tor...
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Modeling and Estimation of Core Losses for Doubly-fed Wound Rotor Induction Machine

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Modeling and Estimation of Core Losses for Doubly-fed Wound Rotor Induction Machine

  1. 1. Modeling and Estimation of Core Losses for Doubly-fed Wound Rotor Induction Machine KRISHNA ROY, AGNIPROTIM SEN, DEBASHIS CHATTERJEE, S.K GOSWAMI By
  2. 2. Introduction <ul><li>Sensorless rotor flux oriented control (RFOC) of induction machines </li></ul><ul><li>Difficulties at lower input frequencies (saturation & DC offset) </li></ul><ul><li>Estimation of low voltage is difficult due to dead bands introduced by the switching devices </li></ul><ul><li>Sub synchronous and super synchronous operation </li></ul><ul><li>Core loss model </li></ul>
  3. 3. Double Inverter Fed Induction Motor
  4. 4. Doubly Fed Induction Motor MODE I MODE II MODE III MODE IV 0 -m1pu m1pu Torque Speed - ω 1PU - ω 2PU ω 1PU ω 2PU
  5. 5. Doubly-Fed Wound Rotor Induction Machine Modeling
  6. 6. Proposed Core loss Model
  7. 7. Equivalent Circuit <ul><li>steady state equivalent circuit for the wound rotor machine with both stator and rotor side excitation </li></ul><ul><li>core loss resistance is considered to be constant throughout the operating region </li></ul>
  8. 8. Modified Equivalent Circuit <ul><li>dynamic equivalent circuit for the wound rotor machine with both stator and rotor side excitation </li></ul><ul><li>the core loss resistance is shown to be variable quantity which is a function of rotor and stator frequencies </li></ul>
  9. 9. Rotor and Stator Frequency Reference
  10. 10. Results
  11. 11. Conclusion <ul><li>V/f-type direct frequency control can be applied on the rotor side </li></ul><ul><li>normal direct torque or flux control can be applied on the stator side </li></ul><ul><li>frequency on either side of the doubly fed wound-rotor induction motor does not go below some minimal value </li></ul><ul><li>the rotor frequency is the slip frequency and can be compared to normal single excitation operation </li></ul><ul><li>with higher rotor injected frequencies, this operation increases the rotor core loss which can overheat the machine </li></ul><ul><li>proper choice of stator and rotor frequencies for different rotor speeds, the total core loss can be restricted within rated core loss over a speed range of 0-1.0 p.u of rotor speed </li></ul>
  12. 12. Thank You

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