有人研究过线路模型的原理及其适用条件么？

Tianjingsha

如贝瑞隆和频率相关

mingyu

在《电力系统的Matlab/simulink在电力系统仿真中的应用》中有对线路模型适用条件的描述。记不太清楚了，好像是＜250km的中段线路可以用集中参数模型（如π型模型），大于250km就要用分布式参数模型。分布模型在不同软件中可能又分好几种（如ATP中的分布参数模型 J.Marti模型、L.Marti线路模型、Noda线路模型、Semlyen模型）。PSCAD中的贝瑞龙模型和依频模型。

Tianjingsha

想了解ＰＳＣＡＤ中线路模型的原理和适应范围呢，楼上的答案有点笼统。不过还是谢谢推荐的这本书

ASLANWH

The Bergeron and Frequency Dependent line models are based on traveling wave theory, and thus have a limitation on the minimum length where they can be used (i.e. the travel time must be >= the time step).  For a time step of 50 ms, this length is about 15 km.  For lines shorter than this, a PI Section model is more suitable.

2 G9 x& u9 i% nWhen the traveling wave line models are used, the calculated travel time of the line/cable will not be an exact integer multiple of the time step.  The user is given a choice to interpolate the travel time or not.  Not interpolating the travel time can introduce errors by artificially increasing or decreasing the effective line length.  Interpolating the travel time will give the correct effective length (and the correct fundamental impedance), but has the disadvantage that it adds additional damping at high frequencies.  For example, an open ended loss-less line with a step input should result in the open-end voltage stepping from 0 to 2 forever.  If interpolation of the travel time is chosen, the square wave will eventually lose all high frequency components and become more of a sine wave

ASLANWH

The Bergeron and Frequency Dependent line models are based on traveling wave theory, and thus have a limitation on the minimum length where they can be used (i.e. the travel time must be >= the time step).  For a time step of 50 ms, this length is about 15 km.  For lines shorter than this, a PI Section model is more suitable.
, r5 F$ }1 n) ^( a1 j( q6 w
When the traveling wave line models are used, the calculated travel time of the line/cable will not be an exact integer multiple of the time step.  The user is given a choice to interpolate the travel time or not.  Not interpolating the travel time can introduce errors by artificially increasing or decreasing the effective line length.  Interpolating the travel time will give the correct effective length (and the correct fundamental impedance), but has the disadvantage that it adds additional damping at high frequencies.  For example, an open ended loss-less line with a step input should result in the open-end voltage stepping from 0 to 2 forever.  If interpolation of the travel time is chosen, the square wave will eventually lose all high frequency components and become more of a sine wave.