Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Overmodulation Characteristics of Carrier Based MVPWM for Eliminating the Leakage Currents in Three-Level Inverter
Authors Eun-Chul Lee ; Nam-Sup Choi ; Kang-Soon Ahn
DOI 10.6113/TKPE/2015.20.6.509
Page pp.509-516
ISSN 1229-2214
Keywords Carrier based PWM; Common mode voltage; Leakage current; MVPWM(Medium Vector PWM); Overmodulation; Three-level inverter
Abstract The overmodulation characteristics of a carrier-based medium vector pulse width modulation (CBMVPWM) are examined in this study. CBMVPWM can completely eliminate leakage currents in a three-phase, three-level inverter using only the switching states with the same common mode voltage even in an overmodulation operation. The analytic equations for the magnitude of the output voltage and the switching frequency are derived for overmodulation operation, and the effect of dead time on the leakage current is demonstrated. This study presents the operating principle of CBMVPWM, basic overmodulation features, and simulations and experiments for operating verification.