考虑频变特性的架空线端口分数阶模型及其数值计算方法
发布时间：2018-08-04 20:17
【摘要】：在电力系统运行中,架空线是连接各个变电站和重要用户之间必不可少的基础设施。雷电袭击架空线引发线路上电压迅速升高从而产生雷电过电压,导致了跳闸事故的发生,严重影响电力系统的安全可靠运行。因此建立更加有效准确的架空线端口模型,不仅能够在电磁暂态计算中广泛的应用,也能更进一步研究输电线路的防雷保护。本文基于分数阶微积分理论,综合考虑导线本身及土壤电参数的频变特性,建立更为准确、有效且简洁的架空线端口分数阶模型,并对其数值计算方法进行深入研究。首先,使用分数阶矢量匹配技术对架空线的特征阻抗进行拟合,基于递归卷积法得到了等值电流源的时域模型,建立考虑频变特性架空线端口分数阶模型。其次,针对所提架空线端口分数阶模型,采用分数阶对应的差分方法,得到了适用于所提分数阶模型的数值计算方法,基于相模变换理论,分别对各个模量的特征阻抗使用分数阶矢量匹配拟合,实现了三相架空线端口雷电过电压的计算,并通过MATLAB语言和EMTP-ATP软件验证了本文所提模型和算法的准确性和有效性。最后结合杆塔数值计算模型,计算了220kV同塔双回架空输电线路的雷电过电压。
[Abstract]:In the operation of power system, overhead line is the essential infrastructure between substation and important users. Lightning attacks on overhead lines lead to a rapid rise in the voltage on the line, resulting in lightning overvoltage, resulting in tripping accidents, which seriously affect the safe and reliable operation of the power system. Therefore, the establishment of a more effective and accurate model of overhead line ports can not only be widely used in electromagnetic transient calculation, but also can further study the lightning protection of transmission lines. Based on fractional calculus theory and considering the frequency variation characteristics of conductors and soil electrical parameters, a more accurate, effective and succinct fractional order model of overhead line ports is established in this paper, and its numerical calculation method is deeply studied. Firstly, the fractional vector matching technique is used to fit the characteristic impedance of overhead line. Based on the recursive convolution method, the time domain model of equivalent current source is obtained, and the fractional order model of overhead line port considering frequency variation is established. Secondly, according to the proposed fractional order model of overhead line port, a numerical calculation method suitable for the proposed fractional order model is obtained by using the fractional order corresponding difference method, which is based on the phase mode transformation theory. The characteristic impedance of each modulus is fitted by fractional vector matching to realize the calculation of lightning overvoltage at the three-phase overhead line port. The accuracy and validity of the proposed model and algorithm are verified by MATLAB and EMTP-ATP software. Finally, the lightning overvoltage of 220kV double-circuit overhead transmission line with the same tower is calculated based on the numerical calculation model of the tower.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75;TM863
[Abstract]:In the operation of power system, overhead line is the essential infrastructure between substation and important users. Lightning attacks on overhead lines lead to a rapid rise in the voltage on the line, resulting in lightning overvoltage, resulting in tripping accidents, which seriously affect the safe and reliable operation of the power system. Therefore, the establishment of a more effective and accurate model of overhead line ports can not only be widely used in electromagnetic transient calculation, but also can further study the lightning protection of transmission lines. Based on fractional calculus theory and considering the frequency variation characteristics of conductors and soil electrical parameters, a more accurate, effective and succinct fractional order model of overhead line ports is established in this paper, and its numerical calculation method is deeply studied. Firstly, the fractional vector matching technique is used to fit the characteristic impedance of overhead line. Based on the recursive convolution method, the time domain model of equivalent current source is obtained, and the fractional order model of overhead line port considering frequency variation is established. Secondly, according to the proposed fractional order model of overhead line port, a numerical calculation method suitable for the proposed fractional order model is obtained by using the fractional order corresponding difference method, which is based on the phase mode transformation theory. The characteristic impedance of each modulus is fitted by fractional vector matching to realize the calculation of lightning overvoltage at the three-phase overhead line port. The accuracy and validity of the proposed model and algorithm are verified by MATLAB and EMTP-ATP software. Finally, the lightning overvoltage of 220kV double-circuit overhead transmission line with the same tower is calculated based on the numerical calculation model of the tower.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75;TM863
【参考文献】
相关期刊论文 前10条
1 申文;刘亚东;盛戈v，
本文编号：2165022
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