臺灣博碩士論文加值系統

本論文在探討以SVC改善汽電共生廠的穩定度問題,完成設計SVC的各種控
制方式,裝設位置及各項參數的設定.文中選擇中鋼公司多機組汽電共生系
統為研究對象.首先針對中鋼系統因軋鋼廠不規則之電力需求而造成局部
電壓不穩定的現象,以電壓調節模式設計裝置SVC於此軋鋼場所在之匯流排
上,並對SVC參數進行設定,最後以穩定度模擬程式加以分析探討之.而中鋼
系統若因故障未及時清除而導致與台電系統解聯,則中鋼系統將會因電力
需求大於供給而陷入不穩定的狀態,此時我們執行一合適的卸載策略使系
統恢復穩定運轉,然後設計SVC以配合此卸載策略,使得系統因卸載執行段
數的減少而將停電導致的損失降至最低,亦使系統回復穩定的速度加快.最
後在順利執行卸載後,若因回復穩定之系統有大型的感應馬達必須起動,則
於起動期間系統將遭受一電壓擾動的問題,此時為了改善上述穩定度問題
而設計裝置的 SVC將轉為改善此電壓擾動問題,其並將SVC改裝設至感應馬
達所在之匯流排上,藉以證明SVC裝設於擾動點對動態穩定度問題的改善為
最佳.

This thesis develops the control strategy, proper installation
location and parameter setting of the SVC to improve the
stability of the cogeneration facility. In this thesis, the
China Steel Corporation (CSC) with many cogeneration units is
selected for the stability problems study. The power system of
CSC always suffers a great voltage fluctuation due to the
operation of rolling mills. To solve this problem, the SVC with
voltage as a feedback signal is assumed to be installed on the
bus which connects to the rolling mill facility. Transient
stability program is then executed to verify the performance of
the SVC. Besides, the load shedding scheme is designed for the
cogeneration to prevent the power system from breakdown after
the tie line is tripped due to external system fault. The SVC
will be used and designed to improve the power system transient
stability and achieve the stable operation during the emergency
state. Furthermore, the system will suffer a voltage
disturbance when a large induction motor is started in the
stable isolated system. According to the computer simulation,
it is concluded that the SVC should be installed at the same
bus as the induction motor to achieve the best enhancement of
system dynamic stability.