三相四線式靜態同步補償器

Abstract

近年來隨著科技的進步，工廠設備所需求的供電品質也越來越高，尤其對於三相交流電機而言，負相序電壓及零相序電壓均不得超過正相序成份的1.5%。為了有效提昇電力品質，如何在現有的環境中發展出可讓系統穩定且維持良好供電品質的補償器，實為重要之課題，有鑑於此，本論文擬研究靜態同步補償器，以改善電壓品質。 本論文中將提出應用對稱成份法之演算法去設計靜態同步補償器。在硬體電路方面將由一個三相四臂脈波寬度調變(Pulse Width Modulation，PWM) 的電壓型變流器連接一個直流電容器所組成。在系統平台方面，則採用數位式架構，以個人電腦為基礎，配合研華科技公司PCL-1800資料擷取卡來完成靜態同步補償器的控制核心。 最後，由模擬與實驗結果可發現，本論文所設計之靜態同步補償可達到降低電壓不平衡率及改善電壓驟降的目的。

Recently, because of advancement in science and technology, factory equipments require better power quality than before, especially in three phase electric machinery where the negative sequence voltage and zero sequence voltage must not exceed 1.5% of positive sequence voltage. Hence, in this thesis, a static synchronous compensator is designed in order to have better voltage profile on the customer side. A symmetrical component algorithm will be proposed for the design of a static synchronous compensator which comprises a three phase four-arm voltage-sourced pulse width modulated inverter with a dc capacitor. The control kernel of the STATCOM is implemented by a PC-based digital system with advanced PCL-1800 data acquisition boards. Finally, based on the results from simulations and experiments, it can be concluded that voltage unbalance and voltage sag can be effectively reduced by the proposed STATCOM.