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A novel soft-switching seven-level converter topology with self-voltage balancing ability

Porkar, S ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/AFRCON.2009.5308097
  3. Abstract:
  4. One of the major limitations of the multilevel converters is the voltage unbalance between different levels. The techniques to balance the voltage between the different levels normally involve voltage clamping or capacitor charge and discharge control. However, traditional Flying Capacitor Converter (FCC) may be quite limited by the voltage unbalance of flying-capacitors that is the most serious problem. This paper describes operating principles of a new softswitching seven-level converter topology based on FCC for self-voltage stabilization and balancing. By adding power electronic devices to the traditional FCC topology, the proposed topology regulates the DC bus voltage and balances the capacitors' voltages. To reduce switching losses and improve the converter efficiency, a soft-switching technique has been used. The softswitching seven-level converter not only utilizes maximum switching operations without additional switching losses, but also it significantly reduces high voltage and current stresses compared with hard-switching converter. Simulation results demonstrate the validity of the new proposed converter topology. © 2009 IEEE
  5. Keywords:
  6. Soft-switching ; Capacitor voltage balancing ; Charge and discharge ; Converter efficiency ; Converter topologies ; Current stress ; DC-bus voltages ; Flying capacitor converter ; High voltage ; Multilevel converter ; Operating principles ; Power electronic devices ; Seven-level ; Simulation result ; Soft-switching technique ; Switching converter ; Switching loss ; Switching operations ; Voltage balancing ; Voltage clamping ; Voltage stabilization ; Voltage unbalances ; Capacitors ; Electric power systems ; Power converters ; Switching circuits ; Topology ; Zero voltage switching ; Capacitance
  7. Source: IEEE AFRICON Conference, 23 September 2009 through 25 September 2009 ; 2009 ; 9781424439195 (ISBN)
  8. URL: http://ieeexplore.ieee.org/document/5308097