Evaluation of current ripple amplitude in three-phase PWM voltage source inverters

2013 ◽  
Author(s):  
G. Grandi ◽  
J. Loncarski
Keyword(s):  
Voltage Source ◽  
Voltage Source Inverters ◽  
Three Phase ◽  
Ripple Amplitude ◽  
Current Ripple

scholarly journals Analysis of Equivalent Inductance of Three-phase Induction Motors in the Switching Frequency Range

Electronics ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 120 ◽  
Author(s):  
Milan Srndovic ◽  
Rastko Fišer ◽  
Gabriele Grandi
Keyword(s):  
Induction Motors ◽  
Harmonic Distortion ◽  
Voltage Source ◽  
Switching Frequency ◽  
Frequency Range ◽  
Leakage Inductance ◽  
Squirrel Cage ◽  
Three Phase ◽  
Ripple Amplitude ◽  
Current Ripple

The equivalent inductance of three-phase induction motors is experimentally investigated in this paper, with particular reference to the frequency range from 1 kHz to 20 kHz, typical for the switching frequency in inverter-fed electrical drives. The equivalent inductance is a basic parameter when determining the inverter-motor current distortion introduced by switching modulation, such as rms of current ripple, peak-to-peak current ripple amplitude, total harmonic distortion (THD), and synthesis of the optimal PWM strategy to minimize the THD itself. In case of squirrel-cage rotors, the experimental evidence shows that the equivalent inductance cannot be considered constant in the frequency range up to 20 kHz, and it considerably differs from the value measured at 50 Hz. This frequency-dependent behaviour can be justified mainly by the skin effect in rotor bars affecting the rotor leakage inductance in the considered frequency range. Experimental results are presented for a set of squirrel-cage induction motors with different rated power and one wound-rotor motor in order to emphasize the aforesaid phenomenon. The measurements were carried out by a three-phase sinusoidal generator with the maximum operating frequency of 5 kHz and a voltage source inverter operating in the six-step mode with the frequency up to 20 kHz.

scholarly journals Remote-State PWM with Minimum RMS Torque Ripple and Reduced Common-Mode Voltage for Three-Phase VSI-Fed BLAC Motor Drives

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 586 ◽  
Author(s):  
Jaehyuk Baik ◽  
Sangwon Yun ◽  
Dongsik Kim ◽  
Chunki Kwon ◽  
Jiyoon Yoo
Keyword(s):  
Pulse Width Modulation ◽  
Torque Ripple ◽  
Motor Drives ◽  
Voltage Source ◽  
Common Mode ◽  
Voltage Source Inverters ◽  
Common Mode Voltage ◽  
Voltage Vector ◽  
Three Phase ◽  
Current Ripple

A minimum root mean square (RMS) torque ripple-remote-state pulse-width modulation (MTR-RSPWM) technique is proposed for minimizing the RMS torque ripple under reduced common-mode voltage (CMV) condition of three-phase voltage source inverters (VSI)-fed brushless alternating current (BLAC) motor drives. The q-axis current ripple due to an error voltage vector generated between the reference voltage vector and applied voltage vector is analyzed for all pulse patterns with reduced CMV of the RSPWM. From the analysis result, in the MTR-RSPWM, a sector is divided into five zones, and within each zone, pulse patterns with the lowest RMS torque ripple and reduced CMV are employed. To verify the validity of the MTR-RSPWM, theorical analysis, simulation, and experiments are performed, where the MTR-RSPWM is thoroughly compared with RSPWM3 that generates the minimum RMS current ripple. From the analytical, simulation, and experimental results, it is shown that the MTR-RSPWM significantly reduces the RMS torque ripple under a reduced CMV condition at the expense of an increase in the RMS current ripple, compared to the RSPWM3.

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