【摘要】：相同感應地電場作用下,不同電壓等級輸電線路的地磁感應電流(geomagnetically induced currents,GIC)大小不同,以往的GIC計算集中在電網(wǎng)最高電壓等級線路,通常忽略其他電壓等級線路的GIC。交流特高壓電網(wǎng)建設使我國電網(wǎng)增加了1 000 kV電壓等級,綜合考慮線路長度、單位阻值等GIC影響因素,準確計算包括500 kV超高壓及1 000 kV特高壓的多電壓等級電網(wǎng)的GIC是重要研究課題。以我國多電壓等級電網(wǎng)(三華電網(wǎng))為例,分別考慮1 000 kV單電壓等級網(wǎng)絡(稱電網(wǎng)1)和500、1 000 kV雙電壓等級網(wǎng)絡(稱電網(wǎng)2),建立了電網(wǎng)1及電網(wǎng)2的全節(jié)點GIC模型并提出了多電壓等級電網(wǎng)的GIC算法,計算了兩種感應地電場情況下電網(wǎng)1及電網(wǎng)2的GIC,比較了兩種情況下電網(wǎng)1及電網(wǎng)2的GIC計算結果。計算結果表明,500 kV超高壓電網(wǎng)的GIC對1 000 kV特高壓變電站的GIC水平有較大的影響,在多電壓等級電網(wǎng)的GIC計算中,不能只計算最高電壓等級電網(wǎng)的GIC,而忽略次級高壓電網(wǎng)GIC的影響。
[Abstract]:Under the same inductive geoelectric field, the magnitude of geomagnetic induced current (geomagnetically induced) of transmission lines with different voltage levels is different. In the past, the calculation of GIC was concentrated on the highest voltage level lines of the power network, and the GICs of other voltage-level lines were usually ignored. The construction of AC UHV power network has increased the voltage grade of 1 000 kV in China's power network, considering the GIC influence factors such as line length, unit resistance and so on. It is an important research topic to calculate accurately the GIC of multi-voltage power network including 500kV UHV and 1000 kV UHV. Take our country's multi-voltage power grid (Sanhua Power Network) as an example, Considering 1 000 kV single voltage grade network (1) and 500 1 000 kV double voltage level network (2) respectively, the full-node GIC model of power network 1 and 2 is established, and the GIC algorithm of multi-voltage grade network is proposed. The GICs of power grid 1 and grid 2 under two kinds of induced geoelectric field are calculated, and the GIC results of grid 1 and power grid 2 are compared. The calculation results show that the GIC of 500kV UHV network has a great influence on the GIC level of 1 000 kV UHV substation, and in the GIC calculation of multi-voltage grade power network, We can't only calculate the GICs of the highest voltage level grid, but ignore the influence of the GIC of the secondary high voltage power network.
【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);
【基金】：國家自然科學基金項目(51177045) 國家863高技術基金項目(2012AA121005) 國家科技部國際合作計劃項目(2010DFA64680)~~
【分類號】：TM744

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