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Pulse Rectifiers Current-Type for Applications in Modern Frequency Converters

Department of Power Electronics and Electric Drives VSB – Technical University of Ostrava Czech Republic. Pulse Rectifiers Current-Type for Applications in Modern Frequency Converters. Pavel HLISNIKOVSKÝ. Petr CHLEBIŠ. Advantages of the Pulse Rectifier Current-Type.

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Pulse Rectifiers Current-Type for Applications in Modern Frequency Converters

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  1. Department of Power Electronics and Electric Drives VSB – Technical University of Ostrava Czech Republic Pulse Rectifiers Current-Typefor Applications in Modern Frequency Converters Pavel HLISNIKOVSKÝ Petr CHLEBIŠ

  2. Advantages of the Pulse Rectifier Current-Type • Sinusoidal current consumption from the mains. • Power factor can be set in wide range, so the pulse rectifier can perform the function of the compensators itself. Minimisation of the sizes and also the price of the chokes at the input side of the converter. • There is not a dangerous effect of not passed commutation as it is in phase controlled rectifiers. Small distance-velocity lag of the converter given by high frequency of the modulation (VPWM or delta modulation). The lower ripple of the output rectified DC current. It enables to use a smaller smoothing choke at the DC side. The converter retains its preferences even at the deformed voltage in the mains.

  3. Power Part of the Three Phase Pulse Rectifier Current-Type

  4. Power Part of the ZCS Indirect Frequency Converter Current-Type

  5. Vector Pulse Width Modulation

  6. Delta Modulation The principle for the Input Unit: • The calculation of the differences between desired and real instantaneous values of the input phase currents. • The determination of the switching combination of the next period for minimizing the differences. The principle for the Output Unit: The calculation of the differences between desired and real instantaneous values of the output phase voltages. The determination of the switching combination of the next period for minimizing the differences.

  7. Measured Results – Input Part Phase current and phase voltage with leading power factor cosφ=0.86 Measured without additional smoothing chokes at the input side of the converter Phase current and line voltage with leading power factor cosφ=0.86 Measured with small smoothing chokes at the input side of the converter

  8. Measured Results – Input Part Phase current and phase voltage with unite power factor Measured without additional smoothing chokes at the input side of the converter Phase current and phase voltage with lagging power factor cosφ = 0.86 Measured without additional smoothing chokes at the input side of the converter

  9. Measured Results – DC link and Output Resonant current pulses in theDC link of the indirect frequency converter using the zero current switching Output phase voltage (up) and output phase current (down) of the ZCS indirect frequency converter current-type with loaded Induction Motor

  10. Realized Physical Model of the Three Phase Pulse Rectifier Current - Type Awarded by SIEMENS OUTPUT: IDC = 10A UDC = 550V

  11. Realized Physical Model of the ZCS IndirectFrequency Converter Current-Type

  12. Thank You for Your Attention DEPARTMENT CZECH REPUBLIC

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