現今電力系統面臨的挑戰之一為風力機組大量併入電網，其中需克服風力輸出的不確定性、管理頻率變化、變壓皺降變動，與輔助服務市場。現今越來越多風場加入電力輔助服務市場。傳統上參與輔助市場的為傳統發電機組較多，然而越來越多新型風機的出產(雙饋感應發電機DFIG、直接驅動同步發電機DDSG)，使得風場越來越有能力參與電力系統服務市場。本論文基於最佳電力潮流(OPF)、節點邊際價錢(LMP)、實功率損失來計算提高電壓穩定度需支付參與風場多少虛功補償輔助服務價錢。本論文使用Power World套裝軟體來模擬風機(DFIG)與計算節點邊際價錢(LMP)，並使用9-Bus系統來模擬當負載增加時，加入風場輔助服務的好處。

Rapidly growth of wind power sector present great challenge for power system operator. These challenges include the ability forecasting wind out- put, manage frequency and voltage variability, as well as ancillary market. Nowadays, through different set of control possibility, wind power plants are able to partly participate in provision of ancillary market.
Traditionally, ancillary market is supported by a lot of conventional generators. However, in recently years, with the penetration of new wind generations (Double Fed Induction Generator (DFIG) and Direct Drive Synchronous Generator (DDSG)) and through different set of control possibility, wind power plants are able to partly participate in provision of ancillary market. This thesis study the method to calculate price of reactive power with the purpose support wind farm provide reactive power in order to increase voltage stability for power system based on Optimal Power Flow, Locational Marginal Price and the loss of active power. This study used the Power World Program to simulate wind generator (DFIG) and calculate locational marginal price. 9-Bus_system is used to show the change of benefit of wind generator when the increasing load is applied.

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