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You haven't provided a lot of information about what you are doing, but here are a few thoughts.. For a generic Statcom, I would recommend the SVSMO3 WECC model over CSTCNT. That probably won't solve your problem, but SVSMO3 is a more representative model. There is also CDVAR7 in the vendor library model for the AMSC D-VAR STATCOM (to which I am very biased).

Are you seeing NaN in your .out file? Or in the progress report? What channels are you trying? Have you tried monitoring branch flows out of the Statcom? I don't believe that Qelec works for FACTS devices. Do you have an Initial Conditions Suspect warnings? Can you confirm that the DYR entry is getting properly associated with your FACTS device?(remember, FACTS devices are referenced by device name)

The FACTS device load flow fields can be confusing. Notably... Terminal Bus Number must be 0 (this creates a shunt device). Shunt Max should be the STATCOM nameplate (1pu) rating. The Series Data fields are not used and can be left with default values.