耐张塔输电线路等值覆冰厚度的简化预测方法

Small signal Impedance Modeling of Line commutated Converter with Commutation Overlap

摘要:

输电线路覆冰会引发断线倒塔事故，严重影响电网的安全运行，准确监测线路覆冰情况具有重要的工程意义和应用价值。在输电线路综合荷载的静力学模型基础上，提出了两种简化的等值覆冰厚度预测方法。第一种简化方法不需要水平档距和高度差参数，减少了输入参数；第二种简化方法不需要角度传感器，避免角度传感器误差造成的预测性能下降，且减小了系统的硬件成本。结果表明:在大水平档距情况下，第一种简化方法与现有方法的预测性能基本一致；在覆冰前后悬垂角变化不大的情况下，第二种简化方法的预测误差在工程允许范围以内。

Abstract:

The icing of transmission lines can cause the accident of line broken and tower collapse, which seriously affects the safe operation of power grid. So accurate monitoring of icing conditions on transmission lines has important engineering significance and application value. Based on static mechanical model of comprehensive load of transmission line, two simplified equivalent ice thickness prediction methods are proposed. The first simplification method does not require horizontal span and height difference parameters, and reduces the input parameters, and the second simplification method does not require angle sensors, avoids the degradation of prediction performance caused by angle sensor errors, and reduces the hardware cost of the system. The results show that in the case of large horizontal span, the prediction performance of the first simplified method is basically the same as that of the existing method, and in the case of little changes in overhang angle before and after icing, the prediction error of the second simplified method is within the engineering allowable range.