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Oct 27, 2019 at 16:53 comment added crasic In other words, taking your train example. The grid frequency will droop by an imperceptible amount as the train energizes. as the size of the load increases or the generating power decreases such that the load is a relatively large portion of generating capacity this frequency change may be a step function. At which point the grid must adjust in the manner described by this and other answers, and if this does not happen, desynchronization will occur.
Oct 27, 2019 at 16:42 comment added crasic In case of an enormous step change in load that cannot be accommodated by speed governors in time , all producers may desynchronize and effectively take the grid down cascading to more and more plants. . At which point you will need to shut down and start everything again.
Oct 27, 2019 at 1:40 comment added relayman357 The EPRI Power System Dynamics Tutorial is a really good read that should help you. It is free for download.
Oct 27, 2019 at 0:26 comment added curiousguy "The energy source (steam, diesel, hydro, etc.) will have to be reduced quickly" And if they don't, where is that excess energy "lost"? Or balancing works in that case? "perfect balance doesn't exist in nature" "Yes it does." This is were I'm lost. Does the floor know how much support you need? What about train passing on a bridge? "From the generator via the grid." Then other users should be robbed of power, no?
Oct 26, 2019 at 23:20 history answered Transistor CC BY-SA 4.0