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How can I modify the circuit to obtain constant power?

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James
James on 31 Mar 2015
Closed: MATLAB Answer Bot on 20 Aug 2021
The circuit consist of a generator running at constant speed input of 1800rpm and is required to power a load of 50kW, 380 V rms, 60Hz. Although I'm feeding in constant speed but the Electrical power, Pe is still fluctuating as seen in the magnified picture on the right. Is there any type of filters or modifications I should do to correct the model? Any comments on the model is greatly appreciated. Thanks :)

Answers (1)

A Jenkins
A Jenkins on 31 Mar 2015
There is bound to be some numerical error in your simulation because you are finding a numerical solution, not analytic.
Your solution looks quite stable to me, but if you think you need more accuracy, you can tighten the error tolerances in the solver under Simulation->Model Configuration Parameters->Solver Options.
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James
James on 1 Apr 2015
Thanks. I understand that fluctuation is rather small around +0.004 to -0.004 of mean value of 504.83 but units are in MW (so a varying difference of 4000W) that is why I'm rather worried.
But at the same time I'm not really sure of the tolerance level involve in reality (e.g power station generators)

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