Global Asymptotic Stability of Current-Controlled Modular Multilevel Converters

Author

Harnefors, Lennart ; Antonopoulos, Antonios ; Ilves, Kalle ; Nee, H.-P.

Author_Institution

Corp. Res., ABB, Vasteras, Sweden

Volume

30

Issue

1

fYear

2015

fDate

Jan. 2015

Firstpage

249

Lastpage

258

Abstract

In this paper, previously developed stability results for open-loop sum-capacitor-voltage control of modular multilevel converters are extended. To give improved damping, circulating-current feedback is included in the control law. With the output-current control loop and a first-order measurement lag taken into account, global asymptotic stability is proven. Careful consideration of the on-line sum-capacitor-voltage reference computation is given, since this is the most critical part of the control system.

Keywords

asymptotic stability; electric current control; power convertors; circulating-current feedback; control law; current-controlled modular multilevel converters; first-order measurement lag; global asymptotic stability; improved damping; on-line sum-capacitor-voltage reference computation; open-loop sum-capacitor-voltage control; output-current control loop; Asymptotic stability; Current control; Current measurement; Harmonic analysis; Integrated circuits; Stability analysis; Voltage control; Converters; Lyapunov methods; current control; multilevel systems;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2014.2298560

Filename

6704795