我國的用電量於近年來皆呈穩定的成長，電力系統之裝置容量、尖峰負載及平均負載亦逐漸攀升，電能的使用儼然已經與民眾的日常生活息息相關。因此，以合理的價格，提供用戶連續且高品質之供電服務，實乃電業責無旁貸的努力目標。目前，台灣電力公司為兼顧投資成本及變電所供電可靠之要求，在變電所匯流排之規劃上，於22/11kV配電級系統大多採用單匯流排架構。惟變電所匯流排架構之規劃，在不同可靠度之需求下，仍有不同之匯流排架構可供配置選用，諸如：1-1/2斷路器匯流排、雙匯流排斷路器及單匯流排附連絡斷路器等。因此，對於重要之供電區域，可經由可靠度評估後，採用適當之配置方式。
有鑑於此，本論文首先依據台電公司現行配電變電所之饋線匯流排架構，並參考文獻之常見型態，以建構變電所匯流排架構之候選類型。其次，使用最小切集法計算各型匯流排架構之負載點可靠度指標。最後，運用預測性可靠度評估方法，進行不同匯流排架構之系統可靠度評估。藉由對變電所各型式匯流排之可靠度評估，本研究提供不同可靠度需求之匯流排型式建議，有利於電力公司未來規劃配電變電所之用。

Electricity consumption in Taiwan has stably grown in recent years. Also, power system installed capacity, peak load and average load have gradually escalated. The use of power seems to have been closely linked with people's daily lives. Therefore, providing continuous and high quality power service at a reasonable rate to the customers is the inevitable goal of the electric utilities. For the present, considering the investment cost and reliability requirement, Taiwan Power Company typically uses a single bus scheme at 22/11kV distribution systems. However, for a different level of reliability required, there are various candidate bus schemes available, such as the breaker and a-half scheme, double bus single breaker scheme and single bus scheme with tie circuit breaker, etc. Therefore, in the important area of electricity supply, the most suitable bus scheme can be determined via reliability assessment so that the reliability of the system can be increased.
In view of this, the various substation bus schemes currently adopted in the Taipower system and those frequently appeared in the literature are first referred to constitute the candidate bus schemes for reliability assessment. Secondly, the reliability indices of a load point for the candidate bus schemes are evaluated using the minimal cut set method. Finally, a predictive reliability assessment method is employed to assess the system reliability indices for different bus schemes. With a variety of reliability evaluation for substation bus schemes, this study can provide suitable bus scheme proposals for different level of reliability and hence will benefit the electric utilities in future distribution substation planning.

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