本論文提出交流/交流轉換器應用於動態電壓恢復器之系統研製。動態電壓恢復器主要目的為防止市電電壓驟降、電壓突升以及電力擾動等狀況發生時,提供設備儀器穩定的交流電壓源,防止電力災害造成當機以及損毀的狀況發生。動態電壓恢復器實現方式由補償變壓器與市電串聯,藉由交流/交流轉換器改變補償變壓器二次側的電壓,達到調節及穩定輸出的功能。因此,交流/交流轉換器的研究與製作將為本文的重點。本研究共提出兩種交流/交流轉換器電路拓樸,分別為單向開關交流/交流轉換器以及雙向開關交流/交流轉換器。動態電壓恢復器的設計規格為,輸入市電電壓在-40%至+20%的電壓擾動範圍內,輸出電壓必須在一個週期內完成電壓補償且變動範圍必須<±3%。系統控制部分使用瑞薩電子所生產的 M16C/29作為本研究控制核心。控制器採用比例積分控制器與自動增益調整控制器實現,進行穩態控制與瞬間性暫態控制,其中一個架構並以內外迴路控制器來增快系統響應時間。在系統防護方面採取主/被動雙重防護機制,提升設備之安全性,其具有過電壓保護、過電流保護以及溫度保護等功能。最後以實作2kVA動態電壓恢復器,以驗證兩種交流/交流轉換器電路拓樸之可行性與正確性。
This thesis presents the design and implementation of AC-AC Converters for Dynamic Voltage Restorers to stabilize single-phase AC line voltage. The main purpose of dynamic voltage restorer is to prevent voltage sags, voltage swells, power disturbance and other situations, thereby providing stable AC voltage source. Dynamic voltage restorer is implemented by compensation transformer connected with input, and then change the secondary side of compensation transformer with AC / AC converter, so as to regulate and stabilize output. Therefore, research and design of AC / AC converter is the main issue in the paper. This study proposes two kinds of AC/AC converter circuit topology, which are unidirectional structure and bidirectional structure. Dynamic Voltage Restorer design specification is for the input voltage in the range of -40% to + 20%, and then the output voltage must complete voltage compensation and the range of variation <± 3% in one cycle. For enhancing the security of the device in the system, the active and passive protection mechanism in the device, which has over-voltage protection, over-current protection and thermal protection will be used. Finally, implementations for 2kVA Dynamic Voltage Restorer is to prove the feasibility and accuracy of two kinds of AC / AC converter circuit topology.