Voltage difference of generators runpf and runopf , case9

runpf.
Bus voltages of power system and generators rigidly set to 1.04, 1.025, 1.025.
The voltage does not change during optimization.

runopf
Voltage at  generator buses after optimization 1.099, 1.097b 1.086.

Question.
Which parameter will change the voltage calculation from the generator busbar 
voltage (ronpf) that is rigidly set to the changing voltage during optimization 
(runopf)?

Igor

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