2. الاسبوع الحادي والعشرون تطبيقات المبدلات Inverter Application تطبيقات المبدلات Inverter Application

5. Study the following :  Inverter application.  Emergency power supply  Single phase motor speed control Study the following :  Inverter application.  Emergency power supply  Single phase motor speed control

7. Comparator Amp. Trigger cct. M TGTG Feed back loop IfIf Potential

10. 1-Uninterruptible power supplies

12. Switch ON or OFF Switch ON or OFF Loads Main feeder converter invertor Battery

13. Static UPS system are two types : 1.short-break UPS. Fig ( 2 ) Batteries Rectifier ac-dc Inverter dc-ac Filter Main ac supply Critical load Static transfer switch Normally off Power flow Normally “OFF” Normally “ON”

14. 2-No-break UPS Fig (3 ) Batteries Rectifier ac-dc Inverter dc-ac Filter Main ac supply Critical load Static transfer switch Normally on Power flow Normally “ON” Normally “OFF”

15. 3-rotating – type UPS system based on dc motor /alternator set. Fig 4: rotating – type UPS system based on dc motor /alternator set. DC M UPS to critical loads Alternator Diesel engine Flywheel Rectifier 3-phase supply mains Battery Bank

17. Variable speed motor drives * DC drives ▹ Power supply for DC motor ▹ Usually controlled rectifier to convert constant AC to variable DC *AC drives ▹ Power supply for AC motor ▹ Mostly for induction motors, but can be used with synchronous motors ▹ Fixed AC →DC (fixed or variable) →Variable frequency and voltage AC 2- Electrical Drive

18. M IfIf Ia V

19. ComparatorAmp. Trigger cct. M TGTG Feed back loop IfIf Potential

20. Variable Speed AC Drive  VVVF control of induction motor 3-phase rectifier 415V 3- phase rectifier 600V DC Link AC motor

21. Three-phase inverter for speed control (by using PWM METHODS )

22. Three phase inverter

23. Waveforms of voltages

25. Key answer Switch ON or OFF Switch ON or OFF Loads Main feeder converter invertor Battery