Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
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 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. Power Part of the Three Phase Pulse Rectifier Current-Type S Fast diode leakage inductance of the transformer 3x L + S1 S3 S5 L1 UDC L2 L3 C1 C2 C3 capacitor battery I DC S4 S6 S2 Power Part of the ZCS Indirect Frequency Converter Current-Type L DC S11 S13 S15 CR I DC S22 S26 S24 L1 L21 L2 L22 L SAT LR L3 C11 C12 C13 L23 S14 S16 S12 S25 S23 S21 C21 C22 C23 Vector Pulse Width Modulation Im inscribed circle S1,S2 i2 the left vector of the sector no. s0 i03 S2,S3 i3 i01 the zero vector of the sector no. s0 s0 s1 I DC i1 S6,S1 the right vector of the sector no. s0 60°- s2 s5 30° i02 I DC max s2 60° i4 S3,S4 s3 i6 S5,S6 i03 i5 S4,S5 Re s5 s4 i01 i02 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. Measured Results – Input Part Phase current and phase voltage with leading power factor cosφ = 0.86 Phase current and line voltage with leading power factor cosφ = 0.86 Measured without additional smoothing chokes at the input side of the converter Measured with small smoothing chokes at the input side of the converter Measured Results – Input Part Phase current and phase voltage with unite power factor Phase current and phase voltage with lagging power factor cosφ = 0.86 Measured without additional smoothing chokes at the input side of the converter Measured without additional smoothing chokes at the input side of the converter Measured Results – DC link and Output Resonant current pulses in the DC 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 currenttype with loaded Induction Motor Realized Physical Model of the Three Phase Pulse Rectifier Current - Type Awarded by SIEMENS OUTPUT: IDC = 10A UDC = 550V Realized Physical Model of the ZCS Indirect Frequency Converter Current-Type CZECH REPUBLIC DEPARTMENT