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In a DC circuit that is what is done and that is=20
intuitively obvious. In an AC circuit, it's a whole lot more=20
complicated and I cannot think of a simple, emailable,=20
written explanation that would explain that.
If we had a DC system, it's clear how this would
be handled: The increased load would cause the
voltage to drop. An op-amp would notice this,
and would inform the generators to increase their
output. This is easy to arrange, by increasing
the excitation in the field coils.
=20
You might imagine that the AC system works the
same way, but it doesn't.