考虑深层大地电阻率的交流系统直流网络模型

发布时间：2018-03-19 10:55

本文选题：大地电阻率　切入点：直流电流分布　出处：《电网技术》2014年10期 　论文类型：期刊论文

【摘要】：直流输电入地电流在大型交流电网中的分布因素复杂,从交流电网元件的直流模型出发,详细论述了输电线路、变压器、变电站/换流站、杆塔-避雷线系统的建模要素,并给出了交流电网直流电流分布的求解方法。以一个两站系统对比了该求解方法和其他标准软件的计算结果,表明了该方法的正确性。以湖北电网的直流电流分布建模和求解为案例,给出在考虑深层大地电阻率参数情况下,地表电位分布和变电站间相互电位耦合的计算公式,并结合湖北电网的变压器中性点直流电流的现场测量数据,说明考虑深层大地电阻率参数情况下直流电流分布的计算结果较过往的经典模型具有更高精度。
[Abstract]:The distribution factors of DC earth current in large AC network are complex. Based on the DC model of AC power grid elements, the modeling elements of transmission line, transformer, substation / converter station, pole tower and lightning arrester system are discussed in detail. The calculation method of DC current distribution in AC power network is given, and the calculation results of this method and other standard software are compared with a two-station system. It is shown that the method is correct. Taking the DC current distribution of Hubei power grid as an example, the calculation formula of the coupling between the surface potential distribution and the mutual potential between substations is given under the condition of considering the deep earth resistivity parameters. Combined with the field measurement data of transformer neutral point DC current in Hubei power grid, it is shown that the calculation results of DC current distribution under the condition of considering the deep earth resistivity parameters are more accurate than those of the previous classical model.
【作者单位】：国家电网公司高压电气设备现场试验技术重点实验室(国网湖北省电力公司电力科学研究院);青海省高海拔电力研究重点实验室(国网青海省电力公司电力科学研究院);武汉大学电气工程学院;
【分类号】：TM721.1

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