A new PWM method for a 3-phase 4-leg inverter based on the injection of the opposite median reference voltage

Abdelkader Bouarfa (1) , Maurice Fadel (2) , Marc Bodson (3)

1 LAPLACE - LAboratoire PLasma et Conversion d'Energie
2 LAPLACE-CODIASE - COmmande et DIAgnostic des Systèmes Electriques
3 The University of Utah, Dept. of Electrical & Computer Engineering

In this paper, a new carrier-based pulse-width modulation (PWM) technique for a voltage source inverter (VSI) is presented. The new modulation law is obtained using a particular configuration of a control allocation technique based on a per-switching-state formulation of the 4-leg 2-level inverter. The resulting modulation law is equivalent to the injection of the opposite of the median reference voltage as a zero-sequence voltage. This particular solution produces a smooth transition from a continuous modulation mode at low modulation depth to a dis-continuous modulation mode at high modulation depth. This hybrid solution makes it possible to focus on the THD for low output voltages and reduce losses for higher voltages.

Mots clés: Carrier-based PWM; Four-leg two-level inverter; Voltage source inverter; Continuous-discontinuous PWM transition method; Discontinuous PWM; DPWM; OMIPWM; Opposite median voltage injection PWM; Zero sequence injection; Two-level inverter; Voltage sequence injection

Mots clés: Injection de l'opposé de la médiane; Injection de séquence nulle de tension; MLI discontinue; Onduleur de tension; MLI intersective; Onduleur quatre bras deux niveaux

Domaines: Energie électrique

Abdelkader Bouarfa, Maurice Fadel, Marc Bodson. A new PWM method for a 3-phase 4-leg inverter based on the injection of the opposite median reference voltage. 2016 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), Jun 2016, Anacapri, Italy. ⟨10.1109/SPEEDAM.2016.7525959⟩. ⟨hal-01899488⟩