Title :
Capacitor voltage balancing in modular multilevel converters
Author :
Korn, A.J. ; Winkelnkemper, M. ; Steimer, Peter ; Kolar, Johann Walter
Author_Institution :
Power Electron. & MVDrives, ABB Switzerland Ltd., Turgi, Switzerland
Abstract :
A universal capacitor voltage control method for converters built from series connected modules is presented. It fully exploits both the circulating currents and the common-mode voltage without affecting the phase current control. The controllability of the capacitor voltages in various such converters is investigated. It is found that the nonzero branch currents and terminal voltages are necessary for capacitor voltage balancing.
Keywords :
capacitors; electric current control; modules; phase control; power convertors; voltage control; capacitor voltage balancing; circulating current; common-mode voltage; modular multilevel converter; nonzero branch current; phase current control; series connected module; universal capacitor voltage control method; Modular Multilevel Converter Control;
Conference_Titel :
Power Electronics, Machines and Drives (PEMD 2012), 6th IET International Conference on
Conference_Location :
Bristol
Electronic_ISBN :
978-1-84919-616-1
DOI :
10.1049/cp.2012.0158
