- 學位論文
大型風力電廠對現有系統電壓穩定度影響之研究
Effects of offshore wind farm interconnected Taipower system
摘要
本論文模擬，每機裝置容量1.5MW雙饋式感應風力發電機，建置一百台風力發電機組，將此大型風力發電機組連接至一離岸變電站後再併入現有台灣電力系統，分別以雙迴路併入台灣電力系統中台西及四湖兩個161kV匯流排，並進行風電系統對電力系統穩態及暫態案例分析，其中案例模擬分為兩部分，穩態模擬包含:風力發電機於最小上機發電與最大額定輸出時，電力系統與風電系統間潮流分析及對系統之電壓變化;風力發電機組於滿載輸出時，風力發電機不同控制模式設定下，風電系統與併接點匯流排電壓變化情形; 計算離岸變電站與併接點之故障電流和短路容量。暫態模擬:包含模擬當風力發電機遇到陣風或疾風時，與所建置風電系統中風力機群連結至離岸變電站最長之輸電線，發生線路跳脫時，對電力系統之併接點電壓擾動情形，並模擬於離岸變電站加入(50MVAr)虛功補償器STATCOM，改善系統暫態干擾響應。最後模擬離岸變電站發生三相短路故障，是否造成電力系統併接點匯流排電壓崩潰，及附近發電廠機組於此故障發生時轉子角度變化情形。
並列摘要
The study aims at transient and steady state voltage stability analyses of the existing power system in parallel with a hundred wind turbines which each rated at 1.5MW. The wind turbines are connected to 161kV Taixi and Sihu substations with a double-loop transmission lines via a new offshore substation. Two categories of simulation have been completed. The steady state simulations include power flow studies and voltage stability analyses between the wind turbines and existing power system under operation condition at maximum and minimum wind turbine outputs. The fault current and short-circuit capacity have also been calculated when 3 phase fault occurred at offshore substation. Voltage disturbances at existing substations are included in transient studies. When the wind turbine is encounting a gust or blast of winds, the far end turbine group which is connected to the offshore substation with longest transmission lines, has been tripped, the voltage disturbance at existing 161kV substations have been observed. In order to improve the transient voltage stability, a STATCOM rated 50MVAr has been considered to install at offshore substation to compensate active power requirement. The voltage collapse condition and the rotor angle variation of the nearby power generators have been examined when 3-phase fault occurred at offshore substation.