同塔双回输电线路参数修正及其影响分析

Parameter Modification Method and Influence Analysis of Double-circuit Transmission Lines on the Same Tower

电网中存在线路无功功率状态估计结果与实际量测值差异较大现象,严重影响电网在线分析与正常调控运行。线路参数作为一种静态基础数据,其准确度直接影响状态估计结果。针对电厂直接接入电网的短距离不换位同塔双回输电线路无功功率状态估计准确率较低现象,通过PSCAD仿真线路并网运行,对线路进行分相建模,提出线路参数修正方法,得到能够准确反映同塔双回线路运行状态的线路参数,并分析不同相序排列对导线自感、互感影响及线路无功功率准确率较低原因。

There is a big difference between transmission line reactive power state estimation results and actual measured val-ues,which seriously affects the normal operation of power grid analysis and other links.As a kind of static basic data,the accu-racy of transmission line parameters affects the result of state estimation.In order to solve the low reactive power state estima-tion accuracy of the short-distance non-transposition double-circuit transmission line on the same tower with the power plant di-rectly connected to the grid,through PSCAD simulate line connected to the grid operation,the line phase modeling is carried out,it proposed the method of line parameter correction,and then,the line parameters which can accurately reflect the running state of double-circuit line in the same tower was obtained.Finally,it analysde the influence of the self-inductance and mutual in-ductance of lines under different phase sequence arrangements and the reasons for low accuracy of line reactive power.