[[alternative]]Application of Dynamic Voltage Restorer for the Improvement of Load Transfer of Distribution Systems

碩士機電工程學系[[abstract]]摘要 提高供電品質及供電可靠度是台電公司一直追求的目標，而負載轉供作業在配電系統運轉上是很重要的工作，在實際運轉上由於電壓相角值、主變壓器阻抗值以及負載量的差異，有一部分饋線負載轉供的操作，會出現異常的電力潮流造成饋線停電，這種不預警的停電常引起用戶的抱怨；本文根據台電配電線路的分佈，大致分成四種負載轉供的型態，並分別對四種負載轉供型態做模擬；在比較模擬結果之後，找出負載轉供作業時會出現異常暫態電流，並超出保護協調設定值的型態，提出加入動態電壓調整器的觀念提升落後的電壓相角，使暫態電流降低不會影響系統供電。 ?印證本文所提出動態電壓調整器提升電壓相角的可行性，運用Matlab/Simulink進行分析及模擬電路架構，以證明本論文所提出之觀念及可行性。 關鍵字 ： 負載轉供、動態電壓調整器[[abstract]]ABSTRACT Taipower company has to put efforts to maintain good power quality and reliability all the years. Among those efforts the load transfer in distribution system determines the important work as mentioned above. It can be divided into four categories. These four types load transfer methodology is based on the concern of real distribution systems. Numerical simulation is first to test and verify the most possible abnormal situations. Most of the cases demonstrate that the large current in load transfer system will sabotage the relay elements. For increasing the voltage angel and decreasing the extraordinary large current, designate DVR is introduced into our simulated system. Simulation results based on MATLAB/Simulink software package show the proposed system performance is improved. This verifies the aim of this thesis for future Taipower load transfer applications. Key word：Load transfer、Dynamic Voltage Restorer(DVR