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PSSE V32, PQ Mismatch Between Pelec/Qelec and Flow(Q+P)

asked Sep 29 '17

haveityourwa gravatar image

updated Sep 29 '17

Hey guys, I am using PSSE V32 to run a dynamic fault study however there seems to be a significant mismatch between Pelec/Qelec and Flow(Q+P) outputs. For example in this case there is an inverter at bus 903 and after the fault the Pelec/Qelec go back to values that are expected, however the Flow(Q+P) to the bus it is connected to 901 are quite different. Any help would be appreciated, Thanks image description

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Is there any more equipment connected to bus 903?

perolofl gravatar imageperolofl (Sep 30 '17)

The only equipment connected to bus 903 is the Generator and the transformer to bus 901

haveityourwa gravatar imagehaveityourwa (Sep 30 '17)

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answered Oct 19 '17

haveityourwa gravatar image

It appears as though there was an issue with the inverter model. However if someone could explain the difference between Qelec/Pelec and Q + P flow that would be appreciated however for now this issue is resolved.

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Pelec & Qelec values are in pu of system base (=100) and to get true values, just multiply their values by 100. After doing that, Pelec = Flow P. Qelec + Qloss at bus 903 (=transformer admittance) = Flow Q

jconto gravatar imagejconto (Oct 19 '17)

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Asked: Sep 29 '17

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Last updated: Oct 18 '17