離島電力系統保護協調研究

Relay Coordination of Island Power Systems

郭文豪(WEN-HAO KUO)

指導教授 ： 陳士麟

中原大學/工學院/電機工程研究所/碩士(2008年)

https://doi.org/10.6840/cycu200900649

摘要

本研究針對金門、馬祖等離島配電系統的保護協調進行分析，主要探討計算本島最大與最小短路電流所依據的慣用準則，是否能適用於離島電力系統。所稱慣用準則指的是：以模擬三相故障來估計最大短路電流、而以模擬單相接地故障來估計最小短路電流，且不考慮系統發電機組的運轉模式。除評估是項本島慣用準則以外，金門、馬祖等離島電力系統，原設計為中性點非接地方式，近期改為中性點接地，惟仍存有部份非接地系統，遂有必要探討接地與非接地兩個系統之間特別是在介面處是否有保護協調的問題，本論文亦將探討之。
研究步驟包括：針對金門與馬祖配電系統，建立模型與蒐集數據，再依不同的機組運轉模式，計算最大及最小短路電流，並檢討保護協調。對於尖峰與離峰的運轉模式，針對所選擇的饋線地點模擬每個故障地點的最大與最小短路電流，模擬結果顯示金門、馬祖等離島電力系統的短路電流特性不同於本島，在大部份的情況下，單相接地故障電流反而大於三相短路電流，本島所採用的最大及最小短路電流慣用準則遂不適用於金門、馬祖等離島電力系統；對於相過流電驛而言，接地系統與非接地系統之間確實有必要進行協調，而對於接地過流電驛，兩個系統之間實無協調的必要。

關鍵字

故障電流 ； 保護協調

並列摘要

The thesis aims at the evaluation of protection coordination for the distribution system of island power system such as that of Kinmen and Matsu. The main research focuses on the evaluation of whether the criteria adopted for estimating the maximum and the minimum short circuit currents (Imax and Imin) of the main-land power system are still applicable to the island power system. The criteria under evaluation refer to the estimation of Imax by simulating the three-phase fault and the estimation of Imin by simulating the single-phase-to-ground fault, both ignoring the operation of generating units for the main-land power system. Apart from evaluation the Imax and Imin criteria, as Kinmen and Matsu had been designed with the neutrally ungrounded power system are presently being changed into the grounded system, thus there is necessity of evaluating the protection coordination, particularly at the interface locations, of both systems, which shall be also under evaluation in this research.
The research procedure includes: the model formulation, the data collection and the modes estimation of Imax and Imin by accounting for the operation of generating units, as well as the review of protection coordination for both Kinmen and Matsu distribution systems. Under the peak and off-peak generation modes, the author estimates Imax and Imin for the selected feeder locations, The simulation shows that the short-circuit current characteristics of the island power system such as Kinmen and Matsu, differ from that of the main-land. Under most occasions, the single-phase-to-ground fault current is higher than that of three-phase and thus the Imax and Imin evaluation criteria adopted for the main-land is not applicable to the island such as Kinmen and Matsu. As to the phase relays, the coordination is necessitated between the grounded and the ungrounded power systems, but the coordination is not necessitated to the ground relays.

並列關鍵字

fault current ； protection coordination

參考文獻

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