Evaluation effective parameters on the output current harmonics of SHE-PWM voltage source inverters

In the present day technology of power semiconductor drives, d.c.-a.c. switch-mode voltage source inverters are widely used in a.c. motor servo drives. In these applications, the motor phase currents need to be controlled for high performance. Thus, the prime control issue is to obtain the switching signals for the inverter switches in order to control/regulate the inverter output current. There are various standard ways to derive the switching signals for the inverter. Undergraduate students of electrical engineering should know these basics and get hands-on experience of the inverter current control techniques while taking a course on Power Electronics and Drives. This paper discusses an efficient way of teaching current control in d.c.-a.c. voltage source inverters by computer simulation studies using the student version of PSpice (Release 9.1). Three standard methods have been demonstrated, i.e., triangular carrier method, hysteresis band method, and periodic sampling method. This paper can be used by students for self-study as well as by instructors for simulation-based laboratory experiments.

Download Full-text

Voltage ripple analysis based on DC-link current harmonics for Voltage Source Inverters

2019 20th Workshop on Control and Modeling for Power Electronics (COMPEL) ◽

10.1109/compel.2019.8769623 ◽

2019 ◽

Cited By ~ 1

Author(s):

Cornelius Rettner ◽

George Jacob ◽

Maximilian Schiedermeier ◽

Andreas Apelsmeier ◽

Martin Marz

Keyword(s):

Voltage Source ◽

Current Harmonics ◽

Voltage Source Inverters ◽

Voltage Ripple

Download Full-text

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

Energies ◽

10.3390/en13174352 ◽

2020 ◽

Vol 13 (17) ◽

pp. 4352 ◽

Cited By ~ 2

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.

Download Full-text