无损耗传输线物理模拟的集总电路级联数目确定方法

发布时间：2018-03-31 14:00

本文选题：物理模拟　切入点：无损耗传输线　出处：《中国电机工程学报》2017年09期

【摘要】：物理模拟是研究电力系统特性、检验继电保护装置性能的模拟试验方法,可以真实地再现被研究对象的物理过程。对于长距离输电线路的物理模拟,如直流输电或半波长交流输电线路等,主要采用由(47)型或T型电路级联构成的集总等效电路,级联电路的数目主要根据经验或仿真计算确定,缺乏一般的解析公式。该文提出了无损耗传输线物理模拟的集总等效定理,通过对无损耗传输线的空间离散并求解差分—微分方程,获得了(47)型或T型电路的级联数目与传输线长度、最高频率、延迟时间及其相对误差的解析公式。采用该解析公式,可以根据物理模拟精度等实际需求,确定(47)型或T型电路的数目。最后,以某1000kV三相半波长输电线路的物理模拟为例,仿真验证了文中集总等效定理的正确性。
[Abstract]:Physical simulation is a simulation test method to study the characteristics of power system and test the performance of relay protection device. For example, DC transmission lines or half-wavelength AC transmission lines are mainly composed of lumped equivalent circuits composed of cascaded circuits of type Li 47) or T type circuits. The number of cascaded circuits is mainly determined by experience or simulation calculation. In this paper, the lumped equivalent theorem for the physical simulation of lossless transmission lines is presented. By discretization of the lossless transmission lines in space, the difference differential equations are solved. The analytical formulas of the number of cascades and the length of transmission lines, the maximum frequency, the delay time and their relative errors are obtained. Finally, taking the physical simulation of a 1000kV three-phase half-wavelength transmission line as an example, the correctness of the lumped equivalent theorem is verified.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);
【基金】：国家电网公司科技项目(SGXJDK00DJJS1600151)~~
【分类号】：TM743;TM75

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