分布参数输电线路的时变动态相量模型及其仿真

THE TIME-VARYINM PHASOR MODEL OF THE DISTRIBUTED PARAMETER TRANSMISSION LINE AND ITS SIMULATION

目前,随着大量的电力电子设备应用于电力系统,由这些设备而产生的更快的暂态现象已超出传统的基于“准稳态”假定的暂态稳定研究范围。所以,基于“准稳态”假定的暂态稳定研究已受到局限。时变动态相量突破了这种局限性,能够被用于分析那些更快的现象。该文把时变动态相量引入电力系统,对分布参数输电线路进行建模,以分析分布参数输电线路的电磁暂态过程,并对分布参数输电线路的模型进行了仿真。通过与EMTP的结果比较得出:作为一种介于电 磁 暂 态 模 型 和“准 稳 态”模 型 之 间 的 中间模型,时变动态相量模型能够定性地分析元件的电磁暂态过程,并能推广到一些既不能完全忽略电磁暂态过程,又不能完全用“准稳态”模型去分析的对象。

Traditional transient studies, which we call 搎uasi-stationary?assumption in power system analysis are limited because of occurrence of more recently faster phenomena related to electromagnetic transients which are leaded by application of power electric devices into power system. 揟ime-varying phasor?breaks through this limitation and can be used to analyze those faster phenomena. This paper brings time-varying phasor concepts into power system to model the distributed parameter transmission line to analyze its electromagnetic transients phenomena. We simulate the model and compare the results with the results of EMTP. The conclusion is drew that the time-varying phasor, as the middle models between EMTP models and 搎uasi-stationary?models, can represent elements?electromagnetic transients at a certain extent, and can be used into power system to simulate objects whose electromagnetic transients can not be ignored and which 搎uasi-stationary?assumption can not be used to analyze.