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POWER ELECTRONICS

بسم الله الرحمن الرحيم. The Islamic University of Gaza Faculty of Engineering Electrical Engineering Department. POWER ELECTRONICS. EELE 5450 — Fall 2009-2010. Instructor: Eng.Moayed N. EL Mobaied. Lecture 30. Dc Chopper. Dc Choppers are of Two Types

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POWER ELECTRONICS

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  1. بسم الله الرحمن الرحيم The Islamic University of Gaza Faculty of Engineering Electrical Engineering Department POWER ELECTRONICS EELE 5450— Fall 2009-2010 Instructor: Eng.Moayed N. EL Mobaied Lecture 30

  2. Dc Chopper • Dc Choppers are of Two Types • 1- Buck converter (Step-down converter) • 2- Boost converter (Step-up converter) • In step down chopper output voltage is less than input voltage. • In step up chopper output voltage is more than input voltage.

  3. Dc Chopper • Problem • Input to the step up chopper is 200 V. The output required is 600 V. If the conducting time of thyristor is 200 sec. Compute • Chopping frequency, • If the pulse width is halved for constant frequency of operation, find the new output voltage.

  4. Dc Chopper

  5. Dc Chopper

  6. Dc Chopper

  7. Control system & power electronics

  8. 3 Control system • The design of intelligent control systems has become an area of modern research. Experience System System Model Conventional Controller Fuzzy Controller PID Controller Fuzzy-PID controller

  9. 34 5- Speed Controllers Design • Block diagram for the system

  10. 35 5- Speed Controllers Design • Three phase induction motor inverter

  11. 36 5- Speed Controllers Design • Three phase induction motor inverter

  12. 37 5- Speed Controllers Design • Three phase induction motor inverter • Mosfet • IGBT • Thyristor

  13. 38 5- Speed Controllers Design • Three phase induction motor inverter

  14. 39 5- Speed Controllers Design • Schematic diagram • for one line of the • inverter

  15. 40 5- Speed Controllers Design • Software implementation of the inverter

  16. 41 5- Speed Controllers Design • Deadband between upper and lower signals

  17. 42 5- Speed Controllers Design • Sine Wave Generation

  18. 44 5- Speed Controllers Design • Sine Wave Generation

  19. 45 5- Speed Controllers Design • Sine Table skipping method for frequency variable

  20. 46 5- Speed Controllers Design • Overall inverter

  21. 47 5- Speed Controllers Design • Controllers design

  22. 48 5- Speed Controllers Design • Three phase induction motor • Two poles. • 250W. • Rotates at up to 2980 rev/min at 50 Hz.

  23. 49 5- Speed Controllers Design • Induction motor model • 1- DC resistance Test. • 2- Locked-rotor Test • 3- No-load test Professor Mahmoud Riaz model

  24. 50 5- Speed Controllers Design • Speed Sensor

  25. 51 5- Speed Controllers Design • PID Controller

  26. 52 5- Speed Controllers Design • Ziegler-Nicholas tuning method • TS is equal at least 4 to 20 times the rise time of the system response.

  27. 53 5- Speed Controllers Design • PID “sequential” algorithm

  28. 54 5- Speed Controllers Design • Step response for PID with speed and load variation

  29. Motor Drive System End of Lecture

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