HVDC is usually used to link two AC power systems with same or different system frequencies. Nevertheless, even the two AC power systems linked have the same rated system frequency, the actual frequencies of the two AC systems may be different from time to time due to different load conditions. As a result, asynchronous operation occurs to the HVDC system, which leads to a lot of harmonics to be induced. The frequencies of the main harmonic are within several to several tens Hz (i.e. sub-harmonics), which coincide with the turbine resonant frequency range. Therefore, it has the potential of producing the sub-synchronous resonance phenomena.
Usually, the sub-synchronous resonance arising from the excitation by the sub-harmonics currents persists only a very short period of time, thereby the induced fatigue loss would not so serious. However, due to the cumulating characteristics, the fatigue loss may reach the dangerous degree if the shafts and blades are persistently subjected to such resonance excitations. According to such a situation, the fatigue life expenditure of the turbine shafts and blades are evaluated in the thesis. It is anticipated that the potential danger of the turbine-generators in conjunction with the operations of HVDC system can be found.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0614101-194222 |
| Date | 14 June 2001 |
| Creators | Tsai, Chia-Chun |
| Contributors | Ming-Yuan Cho, Chun Chin, Wen-Chang Tsai, Whei-Min Lin, Ta-Peng Tsao |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0614101-194222 |
| Rights | restricted, Copyright information available at source archive |
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