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How to Convert synchronous generators into asynchronous generators?

asked 2019-03-07 21:54:25 -0500

Camps94 gravatar image

Hello,

I am trying to convert a synchronous generators into an asynchronous generators to simulate the presence of a renewable energy plant which can control frecuency stability. To do so, I have to do this:

  1. Transform GENERATOR into a LOAD where PLoad = -PGEN and QLoad = -QGEN.

Does anyone how could I do it? I just want to simulate the effect of the presence of solar/wind energy generators in the frecuency stability for a simulation. I would like to do it with a script if its possible.

Thank you very much

Looking forward to hearing your answers!

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answered 2019-03-08 00:13:37 -0500

perolofl gravatar image

Use GNET to convert the generator at bus ibus to a load:

psspy.bsys(1,0,[0.0,0.0],0,[],1,[ibus],0,[],0,[])
psspy.gnet(1,0)
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Thank you so much for your answer. Just to clarify..Doing so you are converting a synchronous generator into a asynchronous that doesn't interfere in the dynamics of the response? Kind of a renewable source I mean. Is it what GNET does?

Camps94 gravatar imageCamps94 ( 2019-03-08 10:47:07 -0500 )edit

I see that after executing the code, the IPLOAD is -PGEN which is great but IQLOAD = 0. is it correct?

Camps94 gravatar imageCamps94 ( 2019-03-08 10:47:40 -0500 )edit

GNET is just taking the plant out of service and replacing it with a negative load. It has nothing to do with renewables. The new load is constant load. It seems you have converted the active load to 100 constant current. What about reactive load? Is is converted to constant impedance (YQload)?

perolofl gravatar imageperolofl ( 2019-03-08 16:26:53 -0500 )edit

This is the response I get in PSSE. I attached to a Google Drive link since I can't post screen captures here directly. LINK: https://drive.google.com/open?id=1XKHmooBmPxedLxvUq7IKcZN1TpltHAkG is it fine that PLOAD and QLOAD are zero whereas IPLOAD is approximately -PGEN and IQLOAD = 0?

Camps94 gravatar imageCamps94 ( 2019-03-11 20:32:57 -0500 )edit

YQload is 173.9142 Mvar at 1 pu voltage! You have already converted Qload to 100% constant impedance load.

perolofl gravatar imageperolofl ( 2019-03-12 09:46:11 -0500 )edit
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answered 2019-03-10 20:18:53 -0500

To simulat a frequency stability (assume it is only for frequency decay), modeling the renewables as negative loads is OK. Also when you convert the load to ZIP model, use the constant power model so the output is not affected by the voltage change. Also don’t apply frequency dependency on it to make sure its output does not affected by frequency too.

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How can I not apply frequency dependency on it? After applying GNET to the bus, PLOAD and QLOAD become zero and IPLOAD = -PLOAD whereas IQLOAD = 0. Is it correct? LINK: https://drive.google.com/open?id=1XKHmooBmPxedLxvUq7IKcZN1TpltHAkG Thank you for the answer

Camps94 gravatar imageCamps94 ( 2019-03-11 20:51:43 -0500 )edit

By the way, how can i implement ZIP Model in PSSE instead of frecuency dependent model?

Camps94 gravatar imageCamps94 ( 2019-03-11 20:56:39 -0500 )edit

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Asked: 2019-03-07 21:54:25 -0500

Seen: 50 times

Last updated: Mar 10