Vreg, Vref, Qext

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These are called "VARS" in the PSSE model documentation. You will have to record channels for them using BAT_VAR_CHANNEL or psspy.var_channel() functions. You will need the index of the VAR you want to record, this can be found using BAT_WNLIST or psspy.wnlist() and a subsystem containing the machine you want to record after loading your dynamic data. Refer to the PSSE documentation "MODELS.pdf" and "API.pdf".