Simulation Running too slow

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Rajendra 2011-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/14003-simulation-running-too-slow

I am trying to do a simple power system simulation. I just need to view the rms value of current. But since, the simulation is running very slow at steps of 1e-8 seconds, I am only getting instantaneous value. How to just solve the circuit for steady state condition? Here is a picture https://lh4.googleusercontent.com/-tBjv-eZlM2I/Tk1auvIklLI/AAAAAAAAA80/YeXeE8z1q0A/s800/too_slow.JPG

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Fangjun Jiang 2011-8-18

Any particular reason using such a small step size? What is the frequency of the signal that you are simulating?

Rajendra 2011-8-19

I am not using any step. It automatically does that. I simply hit run. Its 60 hz ofcourse.

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Answer 1

Fangjun Jiang 2011-8-19

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I don't have that Toolbox. I remember reading some posts here that the simulation step is variable step. I think you can go to menu Simulation->Configuration Parameters ...Solver to set up the maximum step size. Step size of 1e-8 seems to small. 1e-3 sounds more reasonable.

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Rajendra 2011-8-19

I just tried setting the min step size (which was previously set to auto) to 0.001.

But when simulating, I get this error message

Derivative input 1 of 'transmission/RMS/integ' at time 0.002200000000000017 is Inf or NaN. Stopping simulation. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances).

Fangjun Jiang 2011-8-19

Okay. There might be some dynamics that require small step size. To find out, you can choose fixed step size and then try-and-error a few times, form 1e-4 to 1e-5, 1e-6, etc.

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