微電網已成為先進國家解決電力系統許多問題的一種重要輔助方法，但微電網本身仍然有許多技術需要突破。本文以Matlab/Simulink建立太陽能發電系統動態模型，並搭配軟體中既有之雙饋式感應發電機與柴油引擎發電機動態模型，以建構出具微電網特性之輻射狀配電網路。本研究分別探討微電網在併網與微電網模式下之故障特性、規劃保護協調曲線；雖然微電網模式所能提供之故障電流較小，但經由對稱成分分析法可得知發生不平衡故障時，將產生零序及負序電流，以往保護設備無偵測負序電流，因此可加入此設備予以改善，並於微電網中加入中央控制單元調整電驛參數，讓不同模式下皆能維持保護協調。此研究結果可供做為國內日後發展微電網規劃與運轉之參考。

Microgrid has become a advanced solution for developed countries to handle many of the problems resulted form power systems. However, there are many technologic issues of microgrid system waiting for challenging. In this thesis, a radial distribution network, characterizing the microgrid, is constructed with a solar power system dynamic model established by using Matlab / Simulink and doubly-fed induction and dynamic models of diesel engine generators built-in software. Although, fault currents of microgrid are smaller, but by using symmetrical component method, we can be aware of zero and negative sequence currents occurring while unbalance faults happen. Most of the protective systems cannot detect negative sequence currents; thus, protective equipments can be combined with phase balance current relays for improving their capability. In addition, central control unit is joined to microgrid for adjusting relay parameters; therefore, protective systems can maintain protective coordination under different modes. The study results can be a useful reference for the future development of the domestic power grid planning and operation of microgrid.

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