5次谐波对高压输电线路特性影响分析研究

Analysis and Research on Influence of 5th Harmonic on High Voltage Transmission Lines

本文基于五次谐波对远距离高压输电线路特性影响进行分析研究。随着以电力电子为基础的设备在电网系统中的大规模的应用,谐波污染已成为电力系统运行中真正关心的问题,而对高压输电线路特性影响最大的就是负序谐波—5次谐波。本文以500kV输电线路为例,建立了独特的PI电路输电线模型,改变功率潮流方向、电流幅值和相位角,研究分析线路5次谐波中对地电压、电流幅值的变化,最后将实验结果叠加到工频的结果中,以全面了解5次电力谐波对稳态下输电线路特性的影响。

This paper analyzes and studies the influence of the fifth harmonic on the characteristics of long-distance high-voltage transmission lines.With the large-scale application of power electronics-based equipment in the power grid system, harmonic pollution has become a real concern in the operation of the power system, and the negative-sequence harmonic—5 th order has the greatest impact on the characteristics of high-voltage transmission lines.harmonic.Taking the 500 kV transmission line as an example, this paper establishes a unique PI circuit transmission line model, changes the power flow direction, current amplitude and phase angle, studies and analyzes the changes of the ground voltage and current amplitude in the 5 th harmonic of the line, and finally the experimental results are superimposed on the results of the power frequency to fully understand the effect of the 5 th power harmonics on the performance of the transmission line in steady state.