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超高压同塔四回输电线路零序参数测量方法

DOI: 10.13334/j.0258-8013.pcsee.2015.17.032, PP. 4548-4556

Keywords: 超高压,同塔四回输电线路,零序参数,传输线方程,分布参数模型,拉普拉斯变换

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Abstract:

现有超高压同塔四回交流输电线路零序参数测量方法存在很多不足之处。针对这些不足,同时考虑同塔四回输电线路零序耦合参数多,存在难以推导全部零序参数计算方法的问题。基于分布参数模型和传输线方程,提出了一种新型超高压同塔四回输电线路的零序工频参数精确测量方法。应用PSCAD建立500kV超高压同塔四回输电线路模型,对200~1900km的不同长度超高压同塔四回输电线路零序参数进行了仿真测量与误差分析比较。理论分析、仿真测试结果均表明,在不同长度同塔四回输电线路参数测量中,现有测量方法测量误差大,所提出的新型测量方法,可同时对零序电阻、零序电感、零序电容进行精确测量,且零序电阻误差在1.5%以内,零序电感和零序电容误差在0.9%以内,测量精度可满足实际工程测量的需要。

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