REGCA1 generator and branch VAR mismatch

asked 2022-07-27 07:29:14 -0500

Henry gravatar image

updated 2022-07-27 07:30:43 -0500


This is a problem in PSSE V34 dynamic simulation. I have a PV farm at bus 1. The PV farm is modeled by REPCA1+REECA1+REGCA1. A transformer branch connect bus 1 to bus 2.

In the initial condition, Qpvfarm (the MVAR output of the PV farm)=Qbranch (branch MVAR flow from bus1 to bus2), which is okay.

I applied a contingency to change a STATCOM output of the system (the STATCOM is not related to PV farm). After the contigency, Qpvfarm is significantly different from Qbranch, which seems to be a bug of the software.

A hint for this mismatch, my PV farm has 0 MVAR output, should not have the capability to regulate its terminal voltage. But the resulting terminal voltage after contingency is a ramping pattern (should be a step in this case).

Did anyone meet the same problem? Or have any idea for this? Thanks

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