摘要
输电线路工频参数的准确及时获得对电力系统至关重要,否则可能会给电力系统带来恶劣的影响,甚至造成重大电力事故的发生。目前国内外针对线路参数理论计算通常采用传统公式。针对中、短输电线路施工或运行中分段参数与整段参数的求解问题,本文以某220kV双回线路为例,验证得到传统方法在求解正序参数上可以很好应用,但在零序参数求解上存在较大误差。为提高零序参数理论计算的准确性,本文首次提出将输电线路划分为整的参数理论计算公式及其等值稳态电路模型,即对各分段输电线路进行参数测试,然后经过科学计算得出整段线路参数,为输电线路参数测量提供了一种快速有效的方法。经实例计算验证该模型在零序参数求解上相对传统模型而言误差更小,可用于中短输电线路的参数计算,并进一步提出了该模型的改进措施。
It is essential for the power system to acquire frequency transmission line parameters accurately and timely, otherwise inaccurate parameters may cause more serious effects or even significant power accident. At home and abroad, line parameters are usually calculated using the traditional formula. Using sub-parameters to calculate the entire parameters in middle and short transmission line construction or operation, and based on an example of a 220kV double circuit transmission line, this paper proved that it is a good application on solving the positive sequence parameters through traditional method, although there is a large error in solving the zero-sequence parameters. To improve the accuracy of the calculation on zero-sequence parameters, this paper put forward a new method on line parameters calculation and its equivalent circuit model of steady-state for the first time. That is firstly, the test on segments of the transmission line parameters is carried out, and then the entire parameters through scientific calculations are obtained, thus providing a fast and effective way to calculate transmission line parameters. Through calculating the example above, this paper proved that the error is smaller on solving the zero-sequence parameters through this new model compared to the traditional model, and this new method can be used for the middle and short transmission line parameters measurement. Moreover, some improvements of the new model are given.
出处
《电工电能新技术》
CSCD
北大核心
2012年第3期77-80,85,共5页
Advanced Technology of Electrical Engineering and Energy
关键词
输电线路
参数计算
分段参数
transmission line
parameter measurement
subsection parameter
