發(fā)布時間：2018-04-19 13:14

  本文選題：強電弱磁 + 跨電壓故障�。� 參考：《電力系統(tǒng)自動化》2017年15期

【摘要】：目前對于同塔四回線路的研究多基于十二序分量法,然而十二序分量法矩陣階數(shù)較高,計算復(fù)雜,且僅適用于線路參數(shù)對稱的情況。提出一種基于經(jīng)典對稱分量法的故障分析新方法,將混壓同塔四回線強電弱磁系統(tǒng)分為強電聯(lián)系的等效電流源系統(tǒng)及弱電強磁系統(tǒng)兩部分;然后,分別計算兩部分電源提供的短路電流;最后將兩部分故障電流疊加,得到強電弱磁系統(tǒng)的故障電流,避免了高階矩陣運算,物理概念清晰,可實現(xiàn)跨電壓不接地故障電流的準(zhǔn)確計算。在PSCAD中搭建500kV/220kV混壓同塔四回線不同類型不接地故障模型,仿真與計算結(jié)果相比較,驗證了所述方法的正確性。
[Abstract]:At present, most of the researches on the same tower four-circuit line are based on the 12-order component method. However, the 12-sequence component method has the advantages of high order of matrix, complicated calculation, and only suitable for symmetrical transmission line parameters.A new fault analysis method based on classical symmetric component method is proposed, in which the four circuit strong and weak magnetic field system of the mixed voltage and the same tower is divided into two parts: the equivalent current source system with strong electric connection and the weak current strong magnetic system.The short-circuit current provided by the two parts of the power supply is calculated separately. Finally, the fault current of the strong electric-weak magnetic system is obtained by superposing the two parts of the fault current, avoiding the high-order matrix operation, and the physical concept is clear.It can realize the accurate calculation of cross voltage ungrounded fault current.The different types of ungrounded fault models of four circuit lines of 500kV/220kV mixed-pressure tower are built in PSCAD. The results of simulation and calculation verify the correctness of the proposed method.
【作者單位】： 新能源電力系統(tǒng)國家重點實驗室(華北電力大學(xué));國電南瑞科技股份有限公司;國網(wǎng)寧夏電力公司;
【基金】：國家重點研發(fā)計劃智能電網(wǎng)技術(shù)與裝備重點專項項目(2016YFB0900604)~~
【分類號】：TM75

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本文編號：1773240