科學園區特高壓供電系統及用戶變電站之接地系統最佳整合

Optimal Integration for the Grounding of VHV Supply System and Customer Substations in the Science Park

張家豪(Jia-Hao Chang)

指導教授 ： 周至如

國立臺北科技大學/電資學院/電機工程系研究所/碩士(2013年)

https://doi.org/10.6841/NTUT.2013.00197

摘要

科學園區特高壓供電系統，主要的接地問題是其地下閉環路供電系統上任何位置發生接地故障時，其所有用戶變電站接地系統都將承受故障電流而衍生其他風險。此外，靠近變電所的用戶極可能遭受來自變電所的高開關突波及雷擊突波之衝擊。為此，這些問題有賴用戶變電站及供電系統的接地配合改善。本研究針對此問題，首先使用電磁暫態特性分析程式(ATP)針對系統不同用戶故障、變電所與用戶變電站開關操作及各地網遭受雷擊時進行模擬分析，取得注入各地網之電流數據，應用接地系統電磁特性分析軟體(CDEGS)，進行用戶地網電磁特性分析，並評估特高壓用戶變電站之人員與設備感電風險。根據評估結果，再以模擬退火法為基礎進行用戶變電站與供電系統的接地整合，所提之整合措施並非僅在於降低接地電阻，更採取相關配套措施以妥善整合，才能達事半功倍之效。這些配套措施包括在用戶變電站內，及在電力公司供電系統上之措施，其所需之成本將加以評估，並進行最佳整合，使達成各項接地需求及合乎各項限制條件，而使總成本降至最低，以便提昇科學園區供電安全且兼顧經濟之考量。

關鍵字

科學園區 ； 用戶變電站 ； 最佳整合 ； 接地故障 ； 雷擊突波 ； 開關突波

並列摘要

The main grounding problem of very high voltage (VHV) (161kV and 69kV) utility power supply system (UPSS) in the science park is that the ground fault current will flow through the grounding system of all the customer substations when fault at any point of VHV underground close loop UPSS, which will produce other risks. Moreover, those customers near utility substation are subject to very high lightning and switching surges from utility substations. Obviously, to mitigate these problems, the grounding of both customer substation and UPSS should be improved together. In thesis, we use alternative transient program (ATP) to construct the VHV UPSS model and then simulate the characteristics of ground fault, lighting surge and switching surge to get the data of fault current that injected into customer grounding system. Furthermore, we use these data to analyze the electromagnetic characteristics of grid of customers by a software package namely the current distribution electromagnetic ground and soil structure analysis (CDEGS) program. The analysis result ensure that the original ground system is highly risky.The grounding improved measures include not only reducing ground resistance but also the use of related supporting measures and their integration which produce more effective results. This thesis aim to find all the feasible supporting measures of grounding base on simulated annealing method, the supporting measures include the measures used in customer substation and that of used on UPSS. The costs of the supporting measures will be assessed and optimal integration based on them are implemented to satisfy all the grounding requirements and constraints by lowest total cost, thus this research will upgrade the electric supply safety in science park and conform with economy.

並列關鍵字

Science Parks ； Customer Substations ； Optimal Integration ； Ground Fault ； Lightning Surge ； Switching Surge

參考文獻

[16] 陳哲彰，超高壓變電所內外接地故障之電磁特性研究，碩士論文，私立中原大學電機工程學系，中壢，2007。

[17] 胡開泰，多地網大型接地系統接地故障之電磁特性研究，碩士論文，私立中原大學電機工程學系，中壢，2001。

[19] 羅景禎，超高壓變電所鄰近線路接地故障特性及其對所內斷路器控制系統之影響研究，碩士論文，國立台北科技大學電機工程學系，台北市大安區，2007。

[21] 鄒國彥，地下超高壓變電所接地系統開關突波特性及其影響研究，碩士論文，國立台北科技大學電機工程學系，台北市大安區，2008。

[22] 楊致嘉，地下超高壓變電所接地故障電流於樓層地網之分佈及其影響研究，碩士論文，國立台北科技大學電機工程學系，台北市大安區，2009。