Comparison of peak-to-peak current ripple amplitude in multiphase PWM voltage source inverters

2013 ◽  
Author(s):  
Gabriele Grandi ◽  
Jelena Loncarski ◽  
Claudio Rossi
Keyword(s):  
Voltage Source ◽  
Peak Current ◽  
Voltage Source Inverters ◽  
Ripple Amplitude ◽  
Current Ripple

scholarly journals A Comprehensive AC Current Ripple Analysis and Performance Enhancement via Discontinuous PWM in Three-Phase Four-Leg Grid-Connected Inverters

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4352 ◽  
Author(s):  
Riccardo Mandrioli ◽  
Aleksandr Viatkin ◽  
Manel Hammami ◽  
Mattia Ricco ◽  
Gabriele Grandi
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Performance Enhancement ◽  
Voltage Source ◽  
Complete Analysis ◽  
Switching Frequency ◽  
Output Current ◽  
Voltage Source Inverters ◽  
Switching Losses ◽  
Current Ripple

A complete analysis of the ac output current ripple in four-leg voltage source inverters considering multiple modulation schemes is provided. In detail, current ripple envelopes and peak-to-peak profiles have been determined in the whole fundamental period and a comprehensive method providing the current ripple rms has been achieved, all of them as a function of the modulation index. These characteristics have been determined for both phase and neutral currents, considering the most popular common-mode injection schemes. Particular attention has been paid to the performance of discontinuous pulse width modulation (DPWM) methods, including DPWMMAX and DPWMMIN, and their four most popular combinations DPWM0, DPWM1, DPWM2, and DPWM3. Furthermore, a comparison with a few continuous techniques (sinusoidal, centered pulse width modulations, and third harmonic injection) has been provided as well. Moreover, the average switching frequency and switching losses are analyzed, determining which PWM technique ensures minimum output current ripple within the linear modulation range at different assumptions. Numerical simulations and laboratory tests have been conducted to extensively verify all the analytical claims for all the considered PWM injections.

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.

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