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asked 2021-03-09 05:07:29 -0500

rahmed gravatar image

I simulate with PSSE a production group loss using a GGOV1 regulator. At first the regulator responds well. So the mechanical power increases to correct the drop in frequency. But when the frequency reaches 49.8Hz the mechanical power begins to drop which is wrong because the setpoint frequency is 50Hz. I can't figure out why this drop and what should I do to correct it.

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answered 2021-03-09 11:02:59 -0500

perolofl gravatar image

In power systems droop control is used for primary frequency control of the generator. This means that the governor is not supposed to bring the frequency back to 50 Hz after a disturbance, e.g. trip of a unit.

After the generation loss the mechanical power is settling at a new operating point based on its droop setting. The frequency droop is defined in CON(J) of the model. The behaviour of your model seems very normal.

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Thank you for your answering. But why other models, such as GAST, don't have the same behaviour as the model GGOV1. In fact, the mechanical power of the GAST increases to correct the drop in frequency and remains constant with the new operating point.

rahmed gravatar imagerahmed ( 2021-03-12 04:26:03 -0500 )edit

Model GGOV1 should also remain constant at a new operating point. Have you simulated until steady a new state is reached?

perolofl gravatar imageperolofl ( 2021-03-15 05:28:26 -0500 )edit

Yes, I did

rahmed gravatar imagerahmed ( 2021-03-17 04:19:37 -0500 )edit

And the new Pmech is above the initial value? I assume you got a new steady operating point.

perolofl gravatar imageperolofl ( 2021-03-17 11:12:11 -0500 )edit

Thank you again for your answer. I don't understand why the drop in Pmech, at a frequency value of 49.75Hz and not 49.9Hz for example.

rahmed gravatar imagerahmed ( 2021-03-18 07:36:24 -0500 )edit

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Asked: 2021-03-09 05:07:29 -0500

Seen: 51 times

Last updated: Mar 09