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Small-Signal Modeling and Analysis of MMC Under Unbalanced Grid Conditions Based on Linear Time-Periodic (LTP) Method.
- Source :
-
IEEE Transactions on Power Delivery . Feb2021, Vol. 36 Issue 1, p205-214. 10p. - Publication Year :
- 2021
-
Abstract
- As in grid-tied Modular Multilevel Converters (MMC), the steady-state operation under asymmetric grid conditions is rather general, especially for the overhead line of the AC network. Therefore, the small-signal dynamics of MMC under unbalanced grid conditions have become a great important research topic. In this paper, the inherent periodic time-varying characteristic of MMC's original relationships is given priority consideration. Based on the linear time-periodic (LTP) method, a general small-signal LTP model under unbalanced grid conditions is built considering the internal dynamic of submodules (SMs). Then based on the eigenvalue locus analysis method from Floquet- Lyapunov theory, the effects of controller parameters and interactions between different controllers on small-signal dynamics are studied, respectively. Finally, the results from the detailed nonlinear MMC model are provided to verify the effectiveness of the proposed analysis. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHASE-locked loops
*EIGENVALUES
*SYSTEM dynamics
Subjects
Details
- Language :
- English
- ISSN :
- 08858977
- Volume :
- 36
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Power Delivery
- Publication Type :
- Academic Journal
- Accession number :
- 148380678
- Full Text :
- https://doi.org/10.1109/TPWRD.2020.2976776