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Published byJosephine Tucker Modified over 8 years ago
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الاسبوع الحادي والعشرون تطبيقات المبدلات Inverter Application تطبيقات المبدلات Inverter Application
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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
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Comparator Amp. Trigger cct. M TGTG Feed back loop IfIf Potential
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1-Uninterruptible power supplies
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Switch ON or OFF Switch ON or OFF Loads Main feeder converter invertor Battery
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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”
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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”
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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
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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
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M IfIf Ia V
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ComparatorAmp. Trigger cct. M TGTG Feed back loop IfIf Potential
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Variable Speed AC Drive VVVF control of induction motor 3-phase rectifier 415V 3- phase rectifier 600V DC Link AC motor
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Three-phase inverter for speed control (by using PWM METHODS )
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Three phase inverter
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Waveforms of voltages
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Key answer Switch ON or OFF Switch ON or OFF Loads Main feeder converter invertor Battery
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