摘要
為提高分散式電源及再生能源的佔比，國內外正積極發展微型電網。微型電網不同於傳統的電力系統，前者的各個電源係採分散式控制，針對不同用戶之需求，以多樣性的再生能源組合供電；而後者係採用集中式大型發電廠，經由輸配電系統供電。在配電系統中，微型電網內的負載可由市電端供電，亦可由區域內的分散式電源或再生能源供電；遇到微型電網外的市電故障甚或全黑時，則能夠由區域內的電源單獨供電，稱為獨立運轉模式，而用戶得以穩定而持續用電，不受市電擾動之影響。由於電源靠近負載更可以減少線路損失，使電能得以作最有效的利用。 本論文概分為兩個部分，第一部分蒐集並整理國內外微型電網的相關發展資料，探討其與傳統電力系統之不同處。第二部分針對微型電網的網路特性提出微型電網的快速分析方法，包含電力潮流、故障電流、保護協調以及因電源/負載變動造成電網頻率偏移等之分析，所提出的方法可用於微型電網之規劃、設計，有助於微型電網之建置與發展。
並列摘要
Microgrid is a revolutionary concept and new vision for power system development. The loads in a microgrid, other than the power transmitted from a power utility, they can also be power supplied from a distributed generator located nearby, called grid connected mode. When a contingency occurs in power utility’s line, microgrid can turn into island mode which is isolated from utility’s grid. Microgrid can provide electricity customers a stable and continuous power supply without outage disturbance. The nearby distributed generator can reduce the energy waste caused in line loss, therefore the energy can be used more efficiently. The design of microgid is different from the design of a traditional power system. Microgrid adopts a combination of various reliably renewable resources to provide power energy and uses distributed control to meet varied demands. It is quite different from the one as in central control that is utilized in the traditional power system. This paper collects detailed information of the development of microgrid system in several countries. The differences between microgrid and the traditional power system are compared. Furthermore, a thorough study is completed on the characteristics and the network structure of microgrid. A set of fast analysis methods for microgrid study are proposed, including power flow, protection methodology and frequency drift. These fast methods can give a quick analysis to present an overview feature of the studied system. It can be a very useful tool in designing and developing microgrid.