| Autor: |
Yu Jin, Jianze Wang, Yiqi Liu, Xinagyu Sai, Yanchao Ji |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Journal of Modern Power Systems and Clean Energy, Vol 7, Iss 6, Pp 1697-1708 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
2196-5420 |
| DOI: |
10.1007/s40565-019-0520-y |
| Popis: |
To explore the clustered voltage balancing mechanism of the cascaded H-bridge static synchronous compensator (STATCOM), this paper analyzes the causes of unbalanced clustered voltage. The negative-sequence current caused by the compensation of unbalanced reactive power or detection and control errors and the zero-sequence voltage caused by voltage drift of the STATCOM neutral point contribute to unbalanced clustered voltage. On this basis, this paper proposes a control strategy to inject negative-sequence current and zero-sequence voltage simultaneously. The injection of negative-sequence current may cause current asymmetry in the grid, and the zero-sequence injection has a relatively limited balancing ability in the clustered voltages. The proposed control strategy can not only generate a faster balancing response than the traditional zero-sequence voltage injection method, but also lower the extent of current asymmetry compared with the traditional negative-sequence current injection method. Then, the negative-sequence current and zero-sequence voltage injection are further transformed into the $dq$ frame to establish a unified frame. The effectiveness of the proposed control strategy is verified by the simulation and experimental results. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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