電力品質對於配電系統是相當重要的。由於電力品質問題的成因是複雜且難以偵測，在實際的電力工程上，趨向使用電力電子技術於電力傳輸線與配電系統。統一電能質量調節器(UPQC)是一種性能優良的新型電力電子裝置，它能夠對電力系統中易出現的多種電壓、電流質量問題進行綜合補償，但是目前沒有特別適用的控制方法能保證其雙向多功能補償特性的實現。在現有的電力電子裝置中，對於提昇電力品質，整合式強化電力品質調節器似乎是最先進且有效的裝置。本論文將焦點設於整合式強化電力品質調節器。一般而言，整合式強化電力品質調節器與強化電力潮流控制器有相同的功率電路，其架構是基於串並聯轉換器，中間使用電容器連接。整合式強化電力品質調節器並聯側控制目標為補償電源電流於負載電流失真的情形，串聯側控制目標為補償負載電壓於電源電流失真的情形。本論文使用同步旋轉座標法，發展改善整合式強化電力品質調節器的控制架構，並有以下的特點：(1)使用串聯控制於電壓驟降與驟升之補償; (2)使用並聯控制於虛功補償並考慮轉換器所能提供之容量。對於整合式強化電力品質調節器的模型與參數設計於論文中也有所討論。本論文以PSCAD模擬軟體測試所提出之控制架構。模擬結果測試各種操作情形，證明所提出之控制架構是有效的。

Electric power quality is one of the most important indicators of power distribution systems. Since the causes of power quality problems are generally complex and difficult to detect, applications of power electronics in power transmission and distribution systems become a new trend in power engineering practice. Unified Power Quality Conditioner (UPQC) is a new power electronic equipment with excellent performance, which can synthetically compensate familiar voltage and current quality problems of power system. However, there’s no control method which is very suitable for UPQC. Among all existing power electronics apparatus, the Unified Power Quality Conditioner (UPQC) seems to be the most advanced and effective way for power quality enhancement. In this thesis, we will focus on the UPQC. Generally speaking, the UPQC and UPFC (Unified Power Flow Controller) have a power circuit the same which is based on series and shunt power converters that share a single DC link. The shunt controller is implemented for load current compensations under harmonic distortion conditions while the series controller is designed for voltage sourced compensations. By applying the (SRF) theory, an improved UPQC control configuration will be developed in this thesis with the following new features: (1) a voltage sag/swell compensator is implemented in the series controller for dynamical voltage restoring, and (2) a reactive power compensation scheme is developed for the shunt controller with considering power ratings of the shunt converter. Practical considerations about UPQC modules and parameters settings are also discussed in details. The proposed control configuration has been validated under the PSCAD simulation environments. Simulation results on various operating conditions have been performed to verify the effectiveness of the proposed control configuration.

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