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invalid shunt status

asked 2018-02-01 23:27:56 -0500

Ali gravatar image

updated 2018-02-01 23:51:17 -0500

Hello, I am trying to increase BShunt of a fixed shunt element using shuntchng and I get error -1 i.e. invalid shunt status. Here is how I write it:

ierr = psspy.shunt_chng(bus,id,intgar1=1, realar2=100)

I am certain that this shunt element exist and I the bus number and id are correct. Could anyone please tell me what I am doing wrong?

I tried changing B-Shunt through GUI and I get the following:

Messages for api SEQFIXEDSHUNT_DATA Messages for shunt "3T" at bus 336 [extended bus name]: (002531) Warn: Sign discrepancy: positive sequence G=.00000 and zero sequence G=-.800000 (002532)

In "Short Circuit" tab of the element properties, G-Zero (MW) has negative sign and B-Zero (MVAr) has a positive sign. Maybe I do not understand their meaning properly. Could anyone please explain these to me?

Thank you in advance.

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answered 2018-02-02 01:15:51 -0500

perolofl gravatar image

The API is doing the wanted data change. Error -1 is a general error code informing about data warning. You can neglect this error. The reason for the warning is that you have a negative G0 while G1 is 0. Change G0 to 0 to get rid of the warning.

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Asked: 2018-02-01 23:27:56 -0500

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Last updated: Feb 02 '18