風力發電機組的發電量會隨著風力大小變化，當風力機組的發電量在系統中占所有發電機組的總發電量的比例越高時，由於風的多變性，對電網的影響就越高，尤其是較小容量的獨立電力系統。本文以台灣某離島獨立電力系統為例，針對系統於不同的狀況，以繞線式感應型風機及雙饋式感應型風機於不同的功因及電壓控制模式與系統併網，當風速下降，使風力機組發電量下降，若系統上熱機備轉容量調度不足，造成電力供應不及需求，會使得頻率下降，無法回復至60Hz。
兩款風機特性不同，正常運轉下繞線式感應型風機會消耗虛功，雙饋式感應型風機因有功因及電壓控制模式，能藉由提供或消耗虛功，來控制風機功因及併接點電壓；若遇風速下降，繞線式感應型風機消耗的虛功會隨著實功減少而下降，虛功潮流改變，使得風機端電壓及負載端電壓上升；雙饋式感應型風機若操作在0.95落後功因控制及1.05標么電壓控制模式，風速下降後，負載端電壓仍有過高的現象；若操作在0.95超前功因控制，風速下降後，風機端電壓及負載端電壓均會上升。
如上所述頻率及電壓的問題，均會影響用戶端用電品質，進而造成電器損壞，故系統上的頻率及電壓的動態響不容忽視，而本模擬結果對於系統的規劃及運轉有相當的助益。

The generated power of wind turbine generators changes with wind speed. The higher the ratio of wind generation to all system generation is, the more wind turbine generators influence the power system due to intermittent characteristics of wind. In particular, independent power systems with small capacities, such as remote islands, will be greatly influenced. This thesis adopts real system data of a remote island of Taiwan to investigate impacts on power systems under different load conditions that are interconnected with wound rotor induction generators(WRIGs) or doubly-fed induction generators(DFIGs) in different power factor control modes and voltage control mode.
If spinning reserve is insufficient, when wind speed ramps down causing wind generation to reduce and power to be unblanced, the frequency will not return to 60Hz. Also, the characteristics of two kinds of wind turbine generators are different. Under normal operating condition, WRIGs will consume reactive power and DFIGs can control power factor values and voltages at points of interconnection. When wind speed ramps down, the reactive power consumed by WRIGs will be reduced resulting in higher terminal voltages of WRIGs and load terminal voltages. If DFIGs are operated in 0.95 lagging power factor or
1.05 voltage control mode, the terminal voltages of DFIGs and load terminal voltages can be higher after wind speed ramps down. If DFIGs are operated in 0.95 leading power factor control mode, the terminal voltages of DFIGs and
load terminal voltages will increase after wind speed ramps down.
Above-mentioned frequency and voltage issues influence power quality
and customer applications,therefore, these responses are very important. The
reserch results are very helpful for both system planning and operations.

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