Abstract
Modular multilevel converter (MMC) has been widely applied in high voltage direct current (HVDC) transmission system, while its complex dynamic characteristics pose challenges for the stable operation under large-signal disturbance. In this paper, the large-signal stability of MMC is investigated under the grid voltage and power disturbances based on the mixed potential function (MPF). Firstly, a MMC simplified model based on average value model (AVM) is introduced. Then, the physical mechanism of the large-signal instability phenomenon is revealed for MMC. Based on the simplified model, the large-signal stability of MMC is analyzed by applying MPF. Furthermore, to diminish the conservatism of the MPF, a large-signal stability criterion is defined by introducing the conservative correction factor. The influences of system parameters on the large-signal stability of MMC are presented by the region of asymptotic stability (RAS). Finally, PLECS simulation case studies are carried out to verify the proposed stability criterion under the grid voltage and power disturbances.
| Original language | English |
|---|---|
| Journal | CSEE Journal of Power and Energy Systems |
| ISSN | 2096-0042 |
| DOIs | |
| Publication status | E-pub ahead of print - 2024 |
Bibliographical note
Publisher Copyright:© 2022 CSEE Journal of Power and Energy Systems. All Rights Reserved.
Keywords
- average value model (AVM)
- large-signal stability
- mixed potential function (MPF)
- Modular multilevel converter (MMC)
- region of asymptotic stability (RAS)