![Subject: Control of Electrical Drives
Subject Code:2160913
Class: 6EE2
Prepared By,
Mayank Velani [160973109035]
PWM
INVERTER
FED VFD](https://image.slidesharecdn.com/mpdf-180511081741/85/PWM-inverter-fed-VFD-1-320.jpg)
PWM inverter fed VFD
- 1. Subject: Control of Electrical Drives Subject Code:2160913 Class: 6EE2 Prepared By, Mayank Velani [160973109035] PWM INVERTER FED VFD
- 2. 1. Theory 2. Circuit diagram 3. Simulation 4. conclusion 5. references Index
- 3. The AC Induction Motor Frequency is Speed Where: N = Speed in RPM Fq = Frequency in Hz P = The number of motor poles 120 is a constant for time conversion P f N *120
- 4. The AC Induction Motor Voltage is torque Where: N = Speed in RPM Fq = Frequency in Hz P = The number of motor poles 5250 is a constant for time conversion N HP Tq 5250*
- 5. Converter Inverter Control DC LINK AC LINE POWER VARIABLE FREQUENCY AC VOLTAGE CONVERTS 50/60 HZ LINE POWER INTO DC INVERTS DC POWER INTO ADJUSTABLE FREQUENCY AC POWER Variable Frequency CONTROL Fig. Block Diagram of VFD
- 6. Variable Frequency CONTROL SOLID STATE BLOCK CONVERTER Dc capacitors INVERTER
- 7. Variable Frequency Control Converts AC power to DC power DC Bus = RMS x 1.414
- 8. Variable Frequency Control converter PWM rectifier is an AC to DC power converter, that is implemented using forced commutated power electronic semiconductor switches. Conventional PWM converters are used for wind turbines that have a permanent-magnet alternator. Today, insulated gate bipolar transistors are typical switching devices. In contrast to diode bridge rectifiers, PWM rectifiers achieve bidirectional power flow. In frequency converters this property makes it possible to perform regenerative braking. PWM rectifiers are also used in distributed power generation applications
- 9. VFC Sections Inverts the DC Bus Voltage into a PWM AC sine wave Monitors the motor Back EMF to determine the load Inverter PWM wave
- 10. … At start up the the discharged caps look as a dead short to the AC line. … The resistor allows the caps to charge softly and prevent fuse faults. Soft Charge Circuit Softchargecircuit
- 13. CURRENT WAVEFORM
- 15. DC LINK WAVE FORM
- 16. THD ANALYSIS
- 17. Conclusion: Thus, we concluded that when the motor works at lower speed, then it will be the less energy utilize. So, significant amount of power can be saved with the help of Variable Frequency Drive (VFD).By changing the frequency and supply voltage of Induction Motor the speed of Induction Motor can be changed. Thus, the Variable Frequency Drive (VFD) can serve both in case of speed control as well as Energy Saving.
- 18. References: 1. B.L.THERAJA,” A TEXTBOOK OF ELECTRICAL TECHNOLOGY” PUBLIDHED BY S.CHAND 2. POWER ELECRONICS BY U A BAKSHI 3. POWER ELECTRONICS BY DR.PS BIMBHRA 4. MORDAN POWER ELECTRONICS AND AC DRIVE BY BIMAL K. BOSE 5. FANDAMENTAL OF ELECTRICAL DRIVES BY GOPAL K. DUBEY