結論

7.1 總結

交流電力電容器廣泛的被應用於改善配電系統之功率因數，但卻有著無法依 負載變動而線性調整之缺點。由於，近年來大量使用非線性負載所造成之階波污 染，對於交流電力電容器有著容易發生串／並聯共振及過電壓／過電流之危險。

為了有效提供一線性可調之虛功量，以電力電子技術為基礎之固態式虛功補 償器被發展出來，它除了：

z 能線性調整補償虛功量外，

z 尚能確保提供之電流為三相弦波，不會受配電系統諧波污染而影響其補償效 果，

因此本論文在第四章發展一固態虛補償器，並以實測驗証其功能，証明固態虛功 補償器確實擁有良好的虛功補償效果。然而，由於固態虛功補償器利用一電力轉 換器直接與負載並聯，因此固態虛功補器必須提供負載所需全部之虛功量，所以 固態虛功補償器之電力轉換器容量必須相當大，而造成固態虛功補償器價格昂 貴，而限制其實用性。

在第五章中提出了一種混合式虛功補償之架構，它有以下特點：

1. 由交流電容器與固態虛功補償器串聯而成，由於結合了交流電容器以提供一 基本虛功量；

2. 固態虛功補償器則是用以在此基本虛功量礎上作上下調整，因此可降低固態 虛功補償器之容量；

3. 且由於固態虛功補償器與交流電容器串聯，而可避免交流電容器之諧波破壞 問題；

4. 由實測結果中，可看出混合式虛功補償器的補償效果幾乎與固態虛功補償器 一樣好。

証明了混合式虛功補償器之可行性。

而為了進一步降低虛功補償器之成本，第六章中又提出了一三相兩臂混合式

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