| Autor: |
Yuming Liao, Heng Nian, Yaoxin Wang, Dan Sun |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
IEEE Access, Vol 11, Pp 63852-63862 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2169-3536 |
| DOI: |
10.1109/ACCESS.2023.3288282 |
| Popis: |
With the rapid growth of renewable energy sources, single-phase rooftop photovoltaic inverters connected to the distribution network have received widespread applications in recent years. In such a distribution network, asymmetric fault problems are likely to occur, and small-signal stability during asymmetric faults becomes important. The existing papers analyzed the sequence impedance and related stability issues during asymmetric faults in a three-phase three-wire system. In contrast, the SIs connected to three-phase four-wire systems requires consideration of the effect of zero-sequence components and the phase to phase coupling effect. Because both the zero-sequence component and phase coupling effect will affect the impedance characteristics of the inverter sub-system and thus the stability of the power system. Therefore, this paper established the $3\ast 3$ admittance model matrix for the inverter sub-system considering the frequency coupling effect and phase coupling effect under asymmetric fault. Based on the admittance model matrix, the main factors including phase-locked loop bandwidth and grid neutral inductance that affects the phase to phase coupling effect are also analyzed. In addition, this paper studies the effect of phase-locked loop bandwidth, short circuit fault degree, and short circuit location on system stability. The validity of theoretical analysis is further verified through the experimental results. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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