Abstract
This article analyzes the influence of the saturation limiter used with dc-link voltage control (DVC) on the transient stability of grid-forming (GFM) inverters and proposes a flexible saturation limiter to alleviate its adverse impact. First, it is found that the conventional saturation limiter (CSL) can enhance transient stability. Yet, it would boost the dc-link voltage or even trigger overvoltage protection, especially when the threshold value of CSL is small. To tackle the adverse impact of CSL on dc-link voltage, a flexible saturation limiter is proposed, which only begins to limit the active power reference when the derivative of dc-link voltage turns from positive to negative (the dc-link voltage reaches its peak value at this instant). Finally, experimental tests confirm the effectiveness of the scheme.
| Original language | English |
|---|---|
| Journal | IEEE Transactions on Energy Conversion |
| Volume | 38 |
| Issue number | 4 |
| Pages (from-to) | 2514-2524 |
| Number of pages | 11 |
| ISSN | 0885-8969 |
| DOIs | |
| Publication status | Published - 1 Dec 2023 |
Bibliographical note
Publisher Copyright:IEEE
Keywords
- Grid-forming (GFM) inverters
- Inverters
- Numerical stability
- Power system stability
- Reactive power
- Stability criteria
- Transient analysis
- Voltage control
- dc-link voltage controller (DVC)
- flexible saturation limiter (FSL)
- transient stability