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POWER ELECTRONICS Instructor: Eng.Moayed N. EL Mobaied The Islamic University of Gaza Faculty of Engineering Electrical Engineering Department بسم الله.

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Presentation on theme: "POWER ELECTRONICS Instructor: Eng.Moayed N. EL Mobaied The Islamic University of Gaza Faculty of Engineering Electrical Engineering Department بسم الله."— Presentation transcript:

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

2 Dc Chopper Dc Choppers are of Two Types 1- Buck converter (Step-down converter) 2- Boost converter (Step-up converter)  I n 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

6

7 Control system & power electronics

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

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

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

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

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

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

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

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

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

17 42 Sine Wave Generation 5- Speed Controllers Design

18 44 Sine Wave Generation 5- Speed Controllers Design

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

20 46 Overall inverter 5- Speed Controllers Design

21 47 Controllers design 5- Speed Controllers Design

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

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

24 50 Speed Sensor 5- Speed Controllers Design

25 51 PID Controller 5- Speed Controllers Design

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

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

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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