應用模擬退火法於自動化配電系統中饋線末端設備之時間電流協調曲線最佳設定

Applying a Simuilated Annealing Method to the Optimal Setting for Time Cooridination Curve of Feeder Terminal Unit in a Distribution Automated System

現代饋線配電系統中，饋線上通常建置通訊設備，稱為饋線末端設備（feeder terminal unit, FTU）。這些通訊設備傳輸通過饋線上電流大小值至控制中心，同時其可以接受控制中心命令，以改變饋線上開關狀態。配合內建於控制中心電腦內之專家程式FDIR （fault detection, isolation, and service restoration），此使饋線配電控制中心可以監視及偵測饋線上停電事故。當持續性停電事故發生時，此配電系統可以自動隔離事故區段並有效地恢復鄰近區段供電，以縮小停電範圍。不過，饋線配電自動化系統成功之關鍵在於FTU 提供給專家程式FDIR 判斷的現場訊息之準確性。實務上，FTU 的動作由電流－－時間平面上之時間電流協調曲線 （time coordination curve, TCC） 決定。因此，為有效提升供電力供應的可靠度，TCC 的設定方式應嚴肅考慮。本文提出設定TCC 的方法以降低專家程式誤判發生率。並提出一種判準，達TCC 之最優化設定。最後，應用模擬退火演算法計算取得多點之設定，以符合將來FTU 技術提昇時之需求。

In a modern distribution system, many communication apparatus arebuilt in the feeders. The apparatus, called Feeder Terminal Unit (FTU),can transmit the information of the magnitude of the current through thefeeder to the control center. FTUs can receive the commands of the controlcenter to open/close switches on the feeder. The modern distributionsystem can operate automatically. Applying the expert program FDIR(Fault Detection, Isolation, and Service Restoration) in the computer of thecontrol center, the system has the functions of telemetry, monitoring, andremote control to detect feeder fault. When a fault occurs, the system willopen/close several switches automatically to isolate the de-energized zoneby the program. Thus, this system can narrow the section of power outagesand effectively restore the power supply of the neighbor sections.But this system can work well only if the information that provide to FDIRby FTUs are accuracy. In practice the action of a FTU is determined bythe associated Time Coordination Curve (TCC) in current-time plane. Forthe purpose of improving the reliability of electric power supply, themethod of setting TCC of FTU shall be examined seriously. In this paperwe discuss how to set up TCC to reduce the misjudgment of FDIR. And acriterion to reach the optimal setting for TCC is proposed. Finally, weapply the simulated annealing method to calculate TCC in order to meet thedemand for the upgrade of FTU in future.