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SystemModeler

About rootMeanSquare block

Colleagues,

In my area, power systems, the possibility of measuring/calculating instantaneous values such RMS and harmonic components is of great interest. To obtain some of these values I have been using the block rootMeanSquare. For a signals that vary smoothly in amplitude, for instance, the result in WSM is an staircase function of time which I believe is rather an approximation. I wonder how the block Mean used in rootMeanSquare is implemented, Could any of you help me to understand this?

Regards

Jesus
POSTED BY: J Jesus Rico-Melgoza
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Thanks Jesus!
POSTED BY: Jan Brugard

Jan, I think using an sliding window of width one period (T) is a better way to calculate means. That way, instantaneous means may be also used to detect inter-cycle changes. I think simulink follows this approach. In the attached file, the fundamental component of the trigonometric series is calculated at each time step.

regards Jesus

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POSTED BY: J Jesus Rico-Melgoza
POSTED BY: Jan Brugard

Jan, It is great to be able to see the actual code. I am not sure, it is a "good" way to calculate instantaneous mean but then we have the possibility of doing in our own way.

Thanks

Jesus
POSTED BY: J Jesus Rico-Melgoza
POSTED BY: Jan Brugard
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