運用不同之控制策略，線上互動型電能轉換器可具備電力調節器、穩壓器、及主動濾波器等功能，因此在不同場合，配合供電系統特性之變化，適時改變電能轉換器運轉模式，可增加其對電力系統之適應性。本論文即在研究電能轉換器於分散型供電系統之品質提升應用策略，首先在分散型發電系統併入電力系統運轉之研究上，其所可能引發之獨立運轉現象，將對電力系統穩定性及安全性構成威脅，因此本論文即行探討該獨立運轉動態程式，並提出主動型及被動型偵測法。由理論分析及實作驗證顯示，本論文所提方法將可提高保護電驛的獨立運轉事件偵測靈敏度，協助分散型發電系統降低獨立運轉事故之發生機率。
其次，在電力品質相關研究領域中，所需解決的電力擾動問題除電壓驟降外，尚包括電壓諧波失真、波形凹陷及電力突波等各種暫態現象，然而目前應用於輸配電系統之動態電壓恢復器，仍無法解決上述高頻電力干擾問題，因此本論文亦研究提出一新型動態電壓恢復器架構，其可同時補償多項電力擾動暫態。再者，由於不斷電系統產品特性強調運轉之穩定性，因此當不斷電系統廠商完成新產品製造後，常需再進行冗長的燒機測試品質驗證過程，然而此舉亦導致大量電力耗能，嚴重悖離節約用電之原則。著眼於未來可能的能源短缺，上述課題的研究及其解決對策的擬定將有其實用上之需要，因此本論文即應用電能轉換器技術，發展不斷電供電系統之節能型燒機測試法。本論文所提系統除可降低執行燒機測試的電力耗能外，並可補償受測不斷電系統運轉產生之電流諧波，避免燒機測試進行時衍生出其對鄰域配電系統之諧波污染問題。

With advances in the technology of power electronics, utility interactive power converter can operate as power conditioner, voltage stabilizer and active power filter. The broad commitments of power converter on utility applications help electrical engineer achieve the goal of reliable and safe operation of an electric power system. In this dissertation, systematic procedures to the prudent design of utility interface power converter are studied. Firstly, anti-islanding methods for the application of power converter on the distributed generation system are discussed. It is known that the occurrence of islanding can deteriorate the reliability of a power system, development of an efficient method to detect the islanding is, therefore, increasingly important. The proposed methods improve the sensitivity and reliability of protective relays that will be a potential candidate to solve the islanding problems besides the traditional approaches.
Next, the power converter is applied for dynamic voltage restorer. The installation of dynamic voltage restorer at transmission and distribution system has demonstrated their effectiveness in improving voltage sags; however, they were found to be of low performance for certain disturbances. By taking all possible disturbances into considerations, the proposed method can ensure a high quality of supplying power that protect customers’ equipment against potential voltage sags and transients. In addition, uninterruptible power supplies are widely used at customer side to mitigate the problems of utility power quality deterioration, yet the input harmonic current of UPS will bring higher possibilities of damaging the sensitive equipment. For those UPS test facilities, this problem becomes particularly serious since a large number of UPS are often simultaneously activated for burn-in test. In this dissertation, a new approach of circulating current method for three-phase UPS testing is proposed. By use of the method, the testing power can be recycled for reuse. Besides, the proposed method is enhanced with a higher immunity to possible harmonics pollution coming from the tested product to the utility supplies. Therefore, electric power quality can be better ensured.

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