A five-level inverter topology with single-DC supply by cascading a flying capacitor inverter and an H-bridge
Rajeevan, P. P.
José I. León
García Franquelo, Leopoldo
|Department||Universidad de Sevilla. Departamento de Ingeniería Electrónica|
|Published in||IEEE Transactions on Power Electronics, 27(8), 3505-3512|
|Abstract||In this paper, a new three-phase, five-level inverter
topology with a single-dc source is presented. The proposed topol-
ogy is obtained by cascading a three-level flying capacitor inverter
with a flying H-bridge power ...
In this paper, a new three-phase, five-level inverter topology with a single-dc source is presented. The proposed topol- ogy is obtained by cascading a three-level flying capacitor inverter with a flying H-bridge power cell in each phase. This topology has redundant switching states for generating different pole voltages. By selecting appropriate switching states, the capacitor voltages can be balanced instantaneously (as compared to the fundamen- tal) in any direction of the current, irrespective of the load power factor. Another important feature of this topology is that if any H-bridge fails, it can be bypassed and the configuration can still operate as a three-level inverter at its full power rating. This fea- ture improves the reliability of the circuit. A 3-kW induction motor is run with the proposed topology for the full modulation range. The effectiveness of the capacitor balancing algorithm is tested for the full range of speed and during the sudden acceleration of the motor.
Editor´s version: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6138327