No Z it is nothing like that simple. Let us look at this properly, using your car as an example. You are happily driving along a flat road at a constant speed and you come to a hill. More power is now needed from the engine to keep up the speed. Your engine however cannot speed up instantly because it's fuel supply is limited. To instantly change RPM takes infinite power, so it takes several seconds, as you do when you push the accelerator, to speed up. This is exactly the same as the grid, which has limited transient power available. It is true that a battery system could pretty much instantly add this power but it needs to know when to do it and how much which it gets from the frequency change. If the frequency didn't change the battery would not supply extra power..... That is how control systems work, they need an error signal to respond.
No Z it is nothing like that simple. Let us look at this properly, using your car as an example. You are happily driving along a flat road at a constant speed and you come to a hill. More power is now needed from the engine to keep up the speed. Your engine however cannot speed up instantly because it's fuel supply is limited. To instantly change RPM takes infinite power, so it takes several seconds, as you do when you push the accelerator, to speed up. This is exactly the same as the grid, which has limited transient power available. It is true that a battery system could pretty much instantly add this power but it needs to know when to do it and how much which it gets from the frequency change. If the frequency didn't change the battery would not supply extra power..... That is how control systems work, they need an error signal to respond.
