Title :
Novel DC Link Balancing Scheme In Five-Level Back-To-Back Converter System
Author :
Grzesiak, Lech M. ; Tomasik, Jacek G.
Author_Institution :
Warsaw Univ. of Technol., Warsaw
Abstract :
Paper presents a novel DC link balancing scheme for a back-to-back system with five-level diode clamped topologies. The proposed algorithm is improvement of the variable switching frequency control strategy formerly introduced with the five-level back-to-back system and it relays on measurement of adjacent capacitor voltages which provide information about the potential variation in consecutive nodes of the 5-level DC link network. Subsequently the adequate control signals are used to modify the multi-carrier PWM modulators on the rectifier side as well as on the inverter side respectively. In result, the voltages across all four capacitors in DC link network are effectively maintained balanced. This new control scheme has advantages over the variable switching frequency due to optimization of the switching losses.
Keywords :
AC-DC power convertors; DC-AC power convertors; PWM invertors; PWM power convertors; PWM rectifiers; switching convertors; AC-DC-AC energy conversion; DC link balancing scheme; adjacent capacitor voltages; five-level back-to-back converter system; five-level diode clamped topologies; inverter; multi-carrier PWM modulators; rectifier side; variable switching frequency control strategy; Control systems; Diodes; Frequency measurement; Network topology; Pulse width modulation inverters; Rectifiers; Relays; Switched capacitor networks; Switching frequency; Voltage control; 5-level diode clamped topology; 5LDCI; 5LDCR; Back-to-back converter; current mode control; multi-carrier PWM;
Conference_Titel :
EUROCON, 2007. The International Conference on "Computer as a Tool"
Conference_Location :
Warsaw
Print_ISBN :
978-1-4244-0813-9
Electronic_ISBN :
978-1-4244-0813-9
DOI :
10.1109/EURCON.2007.4400692
