Title :
Global asymptotic stability of modular multilevel converters with measurement lag and circulating-current control
Author :
Harnefors, Lennart ; Antonopoulos, Antonios ; Nee, H.-P.
Author_Institution :
Corp. Res., ABB, Vasteras, Sweden
Abstract :
In this paper, previously developed stability results for open-loop sum-capacitor-voltage control of modular multilevel converters are extended. To obtain improved damping, circulating-current feedback is included in the control law. A first-order measurement lag is added to this feedback. With these additions, global asymptotic stability is proven. Careful consideration of the online control-law computation is given, since this is the most critical part of the control system. Experimental results verify the theory.
Keywords :
asymptotic stability; convertors; damping; electric current control; feedback; circulating-current control; circulating-current feedback; damping improvement; first-order measurement lag; global asymptotic stability; modular multilevel converters; online control-law computation; Asymptotic stability; Current measurement; Damping; Integrated circuits; Resistance; Stability criteria; Voltage control; Active damping; Converter control; Estimation technique; Multilevel converters; Non-linear control;
Conference_Titel :
Power Electronics and Applications (EPE), 2013 15th European Conference on
Conference_Location :
Lille
DOI :
10.1109/EPE.2013.6634453
