While it has been stressed that frequency is the same in steady state
throughout a synchronous grid, two very interesting questions need to be
answered:
What is the precise value of frequency to which a system will settle?
How does the "system frequency" vary during transients? How does one obtain a useful definition of frequency when individual generators speeds can be different during transients?
To understand this we need to look at the basic governing equations of synchronous machines in a system.
