Abstract
There is larger effect of single-phase reclosure sequence on ultra-high voltage AC/DC parallel system's transient stability. To discuss the inherent mechanism of this issue, single generator-ultra-high voltage AC/DC parallel transmission-infinite bus system is constructed, and equivalent AC impedance of DC system is derived based on switch function method and thus electromagnetic power expression is obtained. By analyzing the changing characteristic of power angle during the whole process that single-phase permanent fault is occurred, single-phase breaker is tripped, reclose to permanent fault and three phase breaker is tripped, influence of single-phase reclosure sequence on system's transient angle stability is described. Setting criterion of reclosure sequence to decrease acceleration area and enhance system's transient stability is proposed, i.e. to reclose on the terminal with smaller equivalent impedance of system. Correctness and effectiveness of the criterion is simulated in single generator-ultra-high voltage AC/DC parallel transmission-infinite bus system and south China power grid in 2010.
| Original language | English |
|---|---|
| Pages (from-to) | 106-113 |
| Number of pages | 8 |
| Journal | Diangong Jishu Xuebao/Transactions of China Electrotechnical Society |
| Volume | 24 |
| Issue number | 10 |
| State | Published - Oct 2009 |
Keywords
- AC/DC parallel system
- Single-phase reclosure sequence
- Transient stability
- Ultra-high voltage
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