Title :
Energy efficiency improvement in ac/dc/ac diode-clamped multilevel conversion systems
Author :
Borghetti, G. ; Carpaneto, M. ; Marchesoni, M. ; Tenca, P. ; Vaccaro, L.
Author_Institution :
Dipt. di Ing. Elettr., Univ. degli Studi di Genova, Genoa
Abstract :
An analysis of the efficiency of AC/DC/AC diode-clamped multilevel converters is presented, where commanded and suitable variations of the DC-link voltages are proposed in order to decrease the energy losses. The study is carried out also aiming at the correct DC-link capacitor voltage balance, obtained with additional chopper stages together with a new PWM technique, considering both inverter and line-side converter behaviour in different working points. The minimum losses and the correct operation of the system are then obtained by combining the optimal operating conditions of the converters. A detailed explanation of the efficiencies evaluation and the main results are reported.
Keywords :
AC-DC power convertors; DC-AC power convertors; PWM invertors; PWM power convertors; choppers (circuits); AC/DC/AC converters; DC-link capacitor voltage balance; PWM technique; chopper stages; diode-clamped multilevel conversion system; energy efficiency improvement; energy losses; inverter; line-side converter; AC motors; Capacitors; Choppers; Circuits; Diodes; Energy efficiency; Energy loss; Pulse width modulation inverters; Rectifiers; Voltage; Adjustable speed drive; converter control; efficiency; multilevel converters;
Conference_Titel :
Power Electronics, Electrical Drives, Automation and Motion, 2008. SPEEDAM 2008. International Symposium on
Conference_Location :
Ischia
Print_ISBN :
978-1-4244-1663-9
Electronic_ISBN :
978-1-4244-1664-6
DOI :
10.1109/SPEEDHAM.2008.4581267
