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At initialization, Vref = Vt+Kc*Qbranch.

During simulation, Verror = Vref-(Vt+Kc*Qbranch).

You want to make a step test from 1.0146 to 1.0222 pu. That is an increase with factor 1.00749.

With the actual Q loading of the plant and the chosen droop factor Kc, Vref shall be changed from 1.0142 to 1.0142*1.00749 = 1.0218.

Please note that due to the dróop Kc, the actual voltage will not reach 1.0222 pu.