臺灣博碩士論文加值系統

電力系統保護協調整體規劃中,環型輸電系統方向性過電流電驛或測
距電驛跳脫時間之設定,除須考慮其方向性外及主保護與後衛保護之協調
性外,連結至環型輸電系統之輻射型饋線過電流保護設備的動作時間亦應
納入檢討.本論文將應用線性規劃法,輔助環型輸電系統方向性過電流電驛
之設定. 為利於程式分析,首先須將保護電驛之時間-電流特性曲線數
位化,利用最小平方誤差法求取模擬電驛動作特性曲線之方程式,在進行線
性規劃求取電驛之最佳設定值時 ,電驛跳脫時間均以所模擬方程式表示
之.以圖形理論,建立環型系統所有過電流電驛主保護及後衛保護電驛對,
主保護及後衛保護電驛間的協調時間為線性規劃中的限制條件之一,而另
一個限制要求是遠端匯流排的後衛保護時間須大於連接至環型系統匯流排
之輻射型饋線保護電驛隔離故障最大跳脫時間與協調時間之和,線性規劃
中的目標函數定義為所有主保護電驛動作時間總和為最小.本論文應用上
述理論及方法於二不同電力系統範例,分析結果為短路故障發生後主保護
電驛在0.25秒內即能隔離故障線路而與後衛保護電驛協調時間亦在0.3秒
至1秒的範圍內,完全滿足含蓋環型系統與輻射型饋線之保護協調整體規
劃.

During planning the coordination of integer electrical
system, all directional overcurrent relays'' settings of network
transmission power system not only the direction and
coordination of primary and backuprelays, but also relays trip
time in the connection of radial systemsthat should be
considered. The application of linear programming in this
research is to get the settings of overcurrent directional
relaysin the network power system. The first step is to
digitalize relays'' Time-Current characteristiccurve data in
order to be analyzed easily in the computer program. Anequation
is simulated by the least square error method. The trip time
ofrelays is always expressed by the equation for making use of
the linearprogramming to get optimal settings of relays. All
overcurrent primary/backup relay pairs in network systems are
gotten by graph theorem. A constraint condition in linear
programmingis the coordination time between the primary and
backup relay, the orderis that the trip time of the backup relay
in far bus is larger than thecoordination time plus maximum trip
time of all relays to isolate thefault part in radial systems of
the bus. The objective function of linearprogramming is the
minimum summation of all primary relays'' trip time.Two different
network transmission power systems use the above methodsin this
research. The results are all the primary relays can trip
within0.25 second and all coordination time is between 0.3
second and 1 second.They satisfy the integer protective
coordination of network transmissionpower system.