摘要：傳統的根據無功功率的定義來計算SVC系統中的無功功率的方法難以滿足快速響應要求，因此本文采用瞬時無功理論來實現SVC系統中無功功率的計算和檢測。分析了瞬時無功理論的原理，在此基礎上推導出SVC系統中瞬時無功功率的計算，然后采用滑動平均窗的方法實現對無功功率的檢測。通過仿真實驗實現SVC系統無功功率的計算和檢測，仿真結果表明算法能快速有效地檢測SVC系統中無功功率，為設計SVC中無功功率的監測和控制系統提供理論依據和實現方法。 敘詞：瞬時無功理論，靜止無功補償器（SVC），無功功率檢測 Abstract：The traditional methods based on definitions of reactive power can not fulfill the demand, so the paper employs the instantaneous reactive power theory to detect the reactive power in SVC system. The paper analyses the principle of instantaneous reactive power theory, and deduces the formula to calculate the instantaneous reactive power in SVC system, and employs a sliding window to calculate the average reactive power. The paper applies the new method by simulation, the results of which show that the method is efficient in detecting reactive power in SVC system and thus provides application in designing the monitor and control system of SVC. Keyword：instantaneous reactive power, Static Var Compensator, reactive power detection