中文摘要：

开关回路电阻是评价开关设备状态的重要参数之一,针对3/2接线方式变电站开关回路电阻在线评估问题,提出一种基于偏最小二乘法的在线计算方法。根据变电站开关电流数据和基尔霍夫定律,建立开关回路电阻的数学模型。为减小不同时刻电流工况线性相关性带来的误差,采用偏最小二乘法求解开关回路电阻。最后,以采用3/2接线方式的某500 k V变电站为例,进行仿真计算。结果表明,采用偏最小二乘法能显著减小电流工况线性相关性带来的误差,相比于最小二乘法,精度更高。

英文摘要：

Switchgear circuit resistance is one of the most important parameters to evaluate the status of switch equipment. Aiming at the online evaluation problem of switchgear circuit resistance under 3/2 connection mode, a kind of online calculation method based on partial least squares is proposed. The mathematical model of switchgear circuit resistance is established according to the data of current flowing through switch equipment and Kirchhoff＇s law. To reduce the error caused by the high linear correlation of current condition at different time, partial least squares method is used to calculate the switchgear circuit resistance. Lastly, using a 500 k V substation which uses 3/2 connection mode as an example to do simulation calculation. The result shows that partial least squares method can reduce the error caused by the high linear correlation of current condition obviously. Compared with least squares method, partial least squares method is more accurate.