本文選題：直流偏磁 + 變壓器��； 參考：《高電壓技術(shù)》2017年04期

【摘要】：直流輸電系統(tǒng)單極大地方式運行會導(dǎo)致交流系統(tǒng)部分變壓器處于直流偏磁狀態(tài)。基于場路直接耦合方法,建立了±800 k V溪浙和±800 k V靈紹特高壓輸電工程的直流偏磁計算模型,確定了建模范圍和地網(wǎng)參數(shù),并對土壤模型進(jìn)行了修正,將直流偏磁電流計算值與現(xiàn)場測試結(jié)果進(jìn)行了對比,測試站點的總的相對平均誤差≤5%,驗證了計算模型的準(zhǔn)確性。進(jìn)一步計算分析了單極大地運行方式下,直流接地極周圍110 k V及以上電壓等級變電站中變壓器的直流偏磁電流分布規(guī)律,結(jié)果表明:站點的直流電流隨著站點與直流接地極之間距離的增加而減小;多臺變壓器并列運行時,流過每臺變壓器的直流電流將大幅度下降;首末站點間跨度增大時,流經(jīng)兩站點的電流將增大。研究可為大型交流電網(wǎng)直流電流分布計算和直流偏磁治理提供參考。
[Abstract]:Operation of DC transmission system in monopole mode will result in DC bias of transformer in AC system. Based on the direct coupling method of field path, the calculation models of DC bias of 鹵800kV Stream Zhejiang and 鹵800kV Lingshao HV transmission projects are established, the modeling range and ground network parameters are determined, and the soil model is modified. The calculated value of DC bias current is compared with the field test results. The total relative average error of the test station is 鈮，

本文編號：1798217