Analysis and Mitigation of Inner Voltage Control’s Negative Damping Effect on Active Power Oscillations in Multi-VSG Systems
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Bibliographic record
Abstract
The virtual synchronous generator (VSG), a grid-forming technology, is emerging as an effective approach to improving frequency and voltage regulation in power grids with high penetrations of inverter-based resources. In a system with multiple parallel VSGs, two types of active power oscillations can occur: one is between the multi-VSG system and the grid (<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">VSG-grid</i> oscillation); the other is among different VSGs within the system (<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">inter-VSG</i> oscillation). Existing studies have shown that these oscillations primarily result from VSGs' emulation of the swing equation. However, the impact of VSG's inner voltage control (IVC) on these oscillations remains inadequately examined. To provide physical insights into this issue, this article proposes damping torque analysis models for the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">VSG-grid</i> and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">inter-VSG</i> oscillations. The models reveal that the IVC introduces negative damping torques to both types of oscillations, potentially leading to oscillatory instability. To address this issue, a graphical IVC parameter design method is proposed. This method defines a satisfactory region that ensures consistently positive net damping torques for both the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">VSG-grid</i> and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">inter-VSG</i> oscillations, thereby effectively mitigating oscillatory instability in multi-VSG systems. Finally, real-time simulations and experiments verify the theoretical analyses and the parameter design method.
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Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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