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

asked 2017-09-29 01:09:41 -0600

haveityourwa gravatar image

updated 2017-09-29 01:11:06 -0600

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 ( 2017-09-30 01:58:27 -0600 )edit

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

haveityourwa gravatar imagehaveityourwa ( 2017-09-30 02:03:22 -0600 )edit

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answered 2017-10-18 18:38:08 -0600

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 ( 2017-10-18 20:39:31 -0600 )edit

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Asked: 2017-09-29 01:09:41 -0600

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Last updated: Oct 18 '17