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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 الرحمن الرحيم EELE 5450 — Fall 2009-2010 Lecture 30
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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.
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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.
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Dc Chopper
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Control system & power electronics
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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
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34 5- Speed Controllers Design Block diagram for the system
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35 Three phase induction motor inverter 5- Speed Controllers Design
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36 Three phase induction motor inverter 5- Speed Controllers Design
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37 Three phase induction motor inverter Mosfet IGBT Thyristor 5- Speed Controllers Design
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38 Three phase induction motor inverter 5- Speed Controllers Design
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39 Schematic diagram for one line of the inverter 5- Speed Controllers Design
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40 Software implementation of the inverter 5- Speed Controllers Design
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41 Deadband between upper and lower signals 5- Speed Controllers Design
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42 Sine Wave Generation 5- Speed Controllers Design
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44 Sine Wave Generation 5- Speed Controllers Design
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45 Sine Table skipping method for frequency variable 5- Speed Controllers Design
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46 Overall inverter 5- Speed Controllers Design
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47 Controllers design 5- Speed Controllers Design
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48 Three phase induction motor Two poles. 250W. Rotates at up to 2980 rev/min at 50 Hz. 5- Speed Controllers Design
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49 Induction motor model 1- DC resistance Test. 2- Locked-rotor Test 3- No-load test Professor Mahmoud Riaz model 5- Speed Controllers Design
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50 Speed Sensor 5- Speed Controllers Design
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51 PID Controller 5- Speed Controllers Design
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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.
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53 PID “sequential” algorithm 5- Speed Controllers Design
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54 5- Speed Controllers Design Step response for PID with speed and load variation
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Motor Drive System End of Lecture
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