Conference paper
Asymmetric overlap and hysteresis current control of zero-current switched alternate arm converter
The alternate arm converter (AAC) is a multilevel converter of the same family as the modular multilevel converter (MMC). Contrary to the MMC, the AAC offers dc-fault tolerant capabilities but requires complex submodule (SM) capacitor voltage/energy regulation and circulating current control. Such control is also limited due to the small overlap period where both arms conduct and energy between the arms can be exchanged.
This paper develops a double-band hysteresis-based circulating current control strategy by introducing an asymmetric overlap period control of the director switches (DSs). The proposed controller ensures zero-current switching operation of the DSs, and increases the flexibility of SM capacitor voltage regulation owing to the asymmetric overlap period.
It improves the performance of current control and energy regulation for the AAC at both near sweet-spot and non sweet-spot operation without disturbing the output voltages and currents. The performance and effectiveness of the proposed controller are illustrated through simulations on MATLAB-Simulink and PLECS.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2016 |
| Pages: | 2526-2531 |
| Proceedings: | 42nd Annual Conference of the IEEE Industrial Electronics Society |
| ISBN: | 1509034749 , 1509034757 , 9781509034741 and 9781509034758 |
| Types: | Conference paper |
| DOI: | 10.1109/IECON.2016.7793990 |
| ORCIDs: | Agelidis, Vassilios |
Alternate arm converter Asymmetric overlap period Multilevel converters Zero-current switching
AAC Capacitors Current control Decision support systems Hysteresis Inductors MATI.AB-Simulink simulations MMC PLECS simulations SM capacitor voltage regulation Voltage control Zero current switching asymmetric overlap period asymmetric overlap period control capacitors director switches do-fault tolerant capabilities double-band hysteresis-bused circulating current control strategy electric current control energy regulation fault tolerance hysteresis modular multilevel converter multilevel converters nonsweet-spot operation performance improvement power control submodule capacitor voltage regulation sweet-spot operation switching convertors voltage control voltage-source convertors zero current switching zero-current switched alternate arm converter zero-current switching
