Abstract
To eliminate low-frequency oscillations, this article proposes an active-damping method for multiple grid-tied virtual synchronous generators (VSGs) in a power plant. First, using Lyapunov's indirect method, the damping ratio of multiple VSGs in parallel is analyzed. The average damping ratio reveals that this multi-VSG power plant can be poorly damped in a wide range of inertia and damping settings. Then, self- and mutual-damping controllers are developed to suppress self- and mutually induced low-frequency power oscillations, respectively. For practical implementation, an adaptive tuning algorithm that enables automatic realization is proposed. Through a reassessment, a remarkable damping-ratio improvement is validated. Moreover, the inertial response improvement is validated by the frequency response analysis. Finally, simulations in Digsilent/PowerFactory and experiments are performed to demonstrate the accuracy of the analyses and the effectiveness of the proposed method.
Original language | English |
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Journal | IEEE Transactions on Industrial Electronics |
Volume | 71 |
Issue number | 4 |
Pages (from-to) | 3673-3683 |
Number of pages | 11 |
ISSN | 0278-0046 |
DOIs | |
Publication status | Published - 1 Apr 2024 |
Bibliographical note
Publisher Copyright:IEEE
Keywords
- active damping
- Damping
- Manuals
- Microgrids
- Oscillators
- Power generation
- Power oscillation
- small-signal stability
- Symbols
- Tuning
- virtual synchronous generator (VSG)