電壓與虛功率控制是電力公司營運上的重要課題，現有許多研究均在探討電壓虛功率控制最佳化問題，以期系統內各節點匯流排電壓能保持在標準電壓值容許之偏差範圍內並確保線路損失之最小化。
本論文結合靈敏度方程式及九區圖法理論，運用於變電所電壓及虛功率控制；首先，建立變電所簡化模型，並推導電壓及虛功率靈敏度方程式，將低壓側匯流排電壓及流經變壓器虛功率之非線性關係式予以線性化，以易於九區圖上預測投切電容器或升降變壓器有載分接頭後造成之電壓及虛功率變化，比較不同調壓設備動作之電壓及虛功率變化量以判斷出理想調壓策略，並且以台電一次變電所模擬電壓及虛功率控制，其模擬結果驗證本文所提方法有效。
本論文所提出的方法原理既簡單且具預測性，更可在不增加成本狀況下，提供更有效之電壓虛功率控制機制。

The voltage/reactive power control in electrical system is an important issue of utility system operation and management. There are many research papers focusing on optimal exploration of voltage/reactive power control problems. The purpose of these studies is aimed at controlling the bus voltage violation within the allowable deviation zone of standard voltage and to minimize the line losses.
The thesis focused on testifying the impact of the sensitivity equation and the Nine-Area Theory on voltage control and reactive power dispatch. First, A simplified model is built up, and the nonlinear relationship between the bus voltage on the low tension side and the reactive power flowing through a transformer is also linearized so that the voltage and the reactive power can be derived. It facilitates predicting the variation of voltage and reactive power influenced by on load tap changer or capacitor banks in Nine-Area Graph. On the basis, the better and adequate voltage regulation strategy is determined by evaluating the change of different voltage /reactive power control. The determined method was simulated on a Taipower primary substation. This result proves that the proposed method is effective.
The method adopted in this thesis is simple in principle but turns out to be with predictability. This method can be considered as an effective mechanism for voltage control and reactive power dispatch without any increase in facility cost.

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