Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 30, Issue 1, Pages 249-258Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2014.2298560
Keywords
Converters; current control; Lyapunov methods; multilevel systems
Categories
Funding
- Elforsk
- Energimyndigheten
- ABB
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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.
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