應用模糊理論設計動態電壓調整器

Abstract

電力品質對產業用電影響極大，供電品質不良易造成敏感設備損壞，導致工廠損失，因此本文對電壓驟降及電壓變動等問題提出改善之方法，達到系統電壓穩定，以提供高品質之電力給工業用戶。 本論文之目的在將模糊邏輯控制理論應用在動態電壓調整器(Dynamic Voltage Regulator, DVR)上。此補償器為串聯型之架構，連接一直流電容器提供電壓來源，使用脈波寬度調變技術控制三相電壓源型變流器之輸出電壓。論文中主要以三相接地故障來驗證所提出補償器的補償性能。模擬方面使用MATLAB軟體來評估系統補償效果；實驗方面採用數位式控制架構，以個人電腦為基礎，配合研華公司PCL-1800資料擷取卡，透過軟體運算產生三相脈波調變訊號，達成電壓補償控制。最後由模擬及實驗結果來驗證所提出之動態電壓調整器在配電系統中，確實可以有效維持系統電壓之穩定性。

The power quality affects the industry to a great extent. Poor quality in the power supply, such as voltage fluctuations, may cause damage in sensitive equipments. How to maintain constant voltage profile at the load bus under disturbance conditions is of major concern in this work. The purpose of this thesis is to use fuzzy logic control to design the Dynamic Voltage Regulator (DVR). This compensator employs a direct current capacitor to offer the voltage source and uses the pulse-width modulation technology to adjust the output voltage of the three-phase voltage-source inverter. DVR can be used to compensate the voltage drop caused by balanced system fault. The effectiveness of the designed DVR is first investigated by digital simulations using the MATLAB software. Then, in the experiment, the control kernel of digital system for DVR is based on a personal computer with Adventec PCL-1800 data acquisition cards. The three-phase pulse width modulation signals are generated by computer software in order to reach the objective of voltage compensation.Finally, it is concluded from results of simulations and experiments that load bus voltage can be effectively regulated by the designed DVR.