Abstract
The adaptive virtual impedance (VI) control emerges as an attractive solution to limit the current of grid-forming voltage-source converters (GFM-VSCs) during grid faults. Yet, the adaptive VI-based current limitation relies on the detection of the current magnitude, which introduces nonlinear dynamics that challenges the controller parameters tuning of GFM-VSCs. This article develops the small-signal model of GFM-VSCs with adaptive VI-based current limitation, from which, the dynamic impact of the adaptive VI is explicitly revealed. Considering such impact, a holistic controller parameters tuning method for GFM-VSC is proposed to guarantee the small-signal stability of the system. Simulation and experimental tests are performed to verify the effectiveness of the theoretical analysis and the proposed parameters tuning method.
| Original language | English |
|---|---|
| Journal | IEEE Transactions on Power Electronics |
| Volume | 37 |
| Issue number | 6 |
| Pages (from-to) | 7185-7199 |
| Number of pages | 15 |
| ISSN | 0885-8993 |
| DOIs | |
| Publication status | Published - 1 Jun 2022 |
Bibliographical note
Publisher Copyright:IEEE
Keywords
- Adaptation models
- Circuit faults
- current limitation
- Cutoff frequency
- Grid-forming
- Power system dynamics
- Power system stability
- small-signal model
- Tuning
- virtual impedance
- Voltage control
- voltage-source converters