Title :
A Five-Level Inverter Topology with Single-DC Supply by Cascading a Flying Capacitor Inverter and an H-Bridge
Author :
Roshankumar, P. ; Rajeevan, P.P. ; Mathew, K. ; Gopakumar, K. ; Leon, Jose I. ; Franquelo, Leopoldo G.
Author_Institution :
Centre for Electron. Design & Technol., Indian Inst. of Sci., Bangalore, India
Abstract :
In this paper, a new three-phase, five-level inverter topology with a single-dc source is presented. The proposed topology 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 fundamental) 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 feature 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.
Keywords :
bridge circuits; induction motors; invertors; power capacitors; power factor; power system reliability; switching convertors; capacitor balancing algorithm; five-level inverter topology; flying H-bridge power cell; induction motor; load power factor; power 3 kW; redundant switching states; single-DC supply; three-level flying capacitor inverter; Capacitors; Clamps; Discharges (electric); Inverters; Switches; Topology; Vectors; Flying capacitor (FC); H-bridge; induction motor drive; multilevel inverter;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2012.2185714