Undefined function or variable "xa" error message

2011 11 27
1 个回答
回答已采纳
更新时间：2014 10 21
3 次查看（30 天）

0 个投票

Hi. As part of my research work, I am investigating the synchronous machine stability at low speeds. I connected the SI fundamental simulink blockset machine with exciter and speed input to a load. Before I simulating I have tried to carry out a load flow to get steady state using the powergui with no success! I keep getting the error, Undefined function or variable "xa" in the matlab window. Unfortunately I cant get past this error and its delaying my research considerably. Can anyone give me direction on this please.....Thanks.

请先登录，再回答此问题。

 采纳的回答

Fangjun Jiang
Fangjun Jiang 2011-11-27

0 个投票

In the Simulink model, press Ctrl+F, search where the variable 'xa' is used. Then assign a proper value to 'xa' in MATLAB Command Window, for example:
xa=1

4 个评论
显示 2更早的评论 隐藏 2更早的评论

Thanks for response. I have tried your suggestion and it doesnt bring out the undefined function or variable. I also tried to assign it the value 1 in the command window with no success, load flow still throws the same error. What baffles me is that it is an extremely simple circuit and shouldnt have such issues. I have also tried constructing afresh from blockset and the power gui keeps throwing same error. Anything else I can try?
I've just tried the same simple circuit with the pu standard synchronous model and the load flow/initialization works! The only problem is the larger network I was using the machine in is such that I need the SI units synchronous machine model and not the per unit one...argggh this is driving me up the wall!
J Gunda
J Gunda 2014-10-21
Hi James...
I am trying to simulate synchronous machine per unit standard block. I have filled all the values but if I observe the waveform of voltage and current its not sinusoidal.
J Gunda
J Gunda 2014-10-21
IF you have any idea regarding pleas help me...

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Simulink 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by