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直流偏磁在線監測系統

日期:2017-02-16 瀏覽次數: ...

 
        我國作為世界上直流輸電應用最多的國家,直流輸電的裝機總容量和單機容量是世界之最,目前已有超過40個建成/在建/規劃中的直流輸電工程。湖北省是我國的直流輸電大省,已建成±500kV直流輸電工程5個:葛上直流、三常直流、三廣直流、三滬直流和三上直流。五個直流輸電工程單極運行均會不同程度地引發周圍變電站變壓器直流偏磁現象。
        交流變電站分布地域廣,數量多,對每個變電站安裝直流偏磁抑制裝置,工作量大,成本高,維護繁瑣。通過監測變壓器中性點的直流電流,能夠有效地判斷各變電站存在直流偏磁風險的程度,找到影響大的變電站,對存在直流偏磁現象的主變中性點接地進行改造,減少投資成本,為有針對性的開展抑制直流偏磁工作提供理論基礎。
        交流電網是一個龐大的直流傳輸網絡,高壓線路是直流電流的重要通道。直流電流除通過中性點直接接地變壓器和輸電線從一個變電站流向另外一個變電站以外,在連接兩變電站輸電線路的地線與變電站接地網相連的情況下,一部分也會從線路地線流過。如果地線電流在流入變電站接地網的總直流電流中占有相當大的比例,它將改變變電站之間的地電位差,從而影響流入變壓器中性點的電流。因此,除了監測變壓器中性點電流,還需要監測架空地線中的直流電流,才能得到交直流混聯電網中的直流分布情況。
        直流偏磁在線監測系統具有直流偏磁預警功能,系統可以直接指出直流偏磁風險較大的變壓器,提示運行人員采取抑制措施;同時全面指出直流電流在交流電網中分布的主要環節,可以用于驗證預報仿真計算的結果,也可以驗證抑制措施的效果及其對電網內其他變電站變壓器中性點直流電流的影響。因此開展直流偏磁在線監測系統的研究,對預防直流偏磁風險,保證交流電網安全運行具有十分重要的意義。
 
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