Abstract
Interactions of identical inverters in weak grids have received wide attentions. However, in a practical wind farm, parameters of grid-side inverters and lengths of collecting lines are not completely the same. In this case, a multi-inverter system is not symmetric, and thus the interaction mechanism could be more complicated than that of identical inverters. To investigate the interaction mechanism of differently parameterized inverters, this paper proposes a clustering-based modeling method, in which inverters with identical parameters are classified as one group. The clustering-based model allows for efficient stability assessment using three low-order transfer function matrices, instead of a full-order dynamic model. The root locus analysis is applied in the clustering-based model for stability analysis. Results show that the interconnection of distinct groups of inverters deteriorates common current stability, but has no impact on interactive current stability. The simulation and rtlab-based experimental results validate the effectiveness of the proposed model and the interaction mechanism of differently parameterized inverters.
Original language | English |
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Journal | IEEE Transactions on Energy Conversion |
Volume | 36 |
Issue number | 4 |
Pages (from-to) | 3031-3043 |
Number of pages | 13 |
ISSN | 0885-8969 |
DOIs | |
Publication status | Published - 1 Dec 2021 |
Bibliographical note
Publisher Copyright:IEEE
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
Keywords
- Admittance
- Analytical models
- dynamic modeling
- eigenvalue analysis
- Equivalent circuits
- Generators
- Interaction
- Inverters
- multiple inverters
- Power system stability
- stability analysis
- Stability criteria