本論文主要在研究微型電網於市電併聯與孤島運轉模式間之轉態行為。首先，利用MATLAB/SimulinkR模擬軟體建立柴油發電機組、直流-交流功率轉換器、直流-直流功率轉換器、電壓控制型直流-交流功率轉換器及電流控制型直流-交流功率轉換器模型。接著，整合所建立之柴油發電機系統與分散型電源轉換器模型，規劃、建構出一模擬用之輻射型微型電網系統模型。最後，則透過各種情境的假設、模擬與分析，探究輻射型微型電網系統於市電因故停電而由併網運轉模式轉換為孤島運轉模式﹔以及反之於市電復電後，由孤島運轉模式轉換為併網運轉模式之轉態行為，對輻射型微型電網系統頻率與各母線電壓所造成的擾動情形，並觀察市電與各分散型電源之功率潮流變化，期藉資探求輻射型微型電網系統之最適規劃與設計，進而提高供電品質，及降低轉態行為對設備與用電裝置所可能造成之衝擊與危害。

The main purpose of this thesis is to investigate the transition behaviors between grid-connected and islanding modes in a microgrid. First of all, a diesel generating set and the converters, involving AC-DC, DC-DC, voltage-controlled DC-AC and current-controlled DC-AC types were modeled by using MATLAB/SimulinkR. Next, a sample radial microgrid system was arranged and formed by integrating the diesel generating set and converters models mentioned above. Finally, the disturbances in the system frequency and bus voltages during the transition periods between grid-connected and islanding modes in a microgrid were simulated and analyzed. In addition, the power flow of DERs and public grid were also observed. On the basis of the achievements of this thesis, the most suitable planning and design for a microgrid can be possible obtained. The lessening the impact on the system equipment and apparatus, and the improvement of power quality during the transitions can then be achieved as well.

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