1000 kV与500 kV同塔四回混压架设输电线路电气不平衡度研究

Study on Electrical Imbalance for 1000 kV and 500 kV Four-circuit Hybrid Transmission Lines on the Same Tower

摘要: 同塔多回输电线路的参数和结构不对称，使输电线路各回及各相之间的互感不相等，导致电力系统中的电压和电流不平衡。以1000 kV与500 kV同塔四回混压架设输电线路为背景，介绍了特高压同塔四回同混压架设输电线路的典型导线排列方式，并搭建PSCAD/EMTDC仿真模型，利用MATLAB软件编制计算程序，分析相序排列方式及其他不同因素对特高压同塔四回混压架设输电线路电气不平衡度的影响，为特高压同塔四回混压架设输电线路工程建设提供参考。

Abstract: The asymmetry in the parameters of multi-circuit transmission lines sharing the same tower leads to unequal mutual inductance between circuits and phases, resulting in voltage and current imbalances within the power system. This paper investigates a 1000 kV and 500 kV quadruple-circuit mixed-voltage transmission line on the same tower, presenting the typical conductor configurations of UHV quadruple-circuit transmission lines. A simulation model was developed using PSCAD/EMTDC, along with a MATLAB-based calculation program, to analyze the effects of phase sequence arrangements and other factors on the electrical imbalance of these UHV mixed-voltage transmission lines. This study provides valuable technical insights for the engineering design and planning of future UHV quadruple-circuit mixed-voltage transmission lines on the same tower.