- #1
girts
- 186
- 22
Hi,
In a given area there are different types of power plants , let's assume they are (coal, nuclear, wind and solar) Now as I have learned most of these plants (except solar and some others) use synchronous generators as the last step between mechanical energy conversion into electricity.
But since the plant sizes and output power (thermal) differ from one to another I assume also the generator sizes, rotor pole count and stator winding size and turn ratio differs correct?
If this is so then I also assume that the output voltage of the stator windings is different say from a 1000MW rated 10 generator Hydro plant to a single nuclear reactor two turbine/two generator set plant and maybe even differ from a single generator single turbine coal plant correct?
So by now I know that in AC grids it is important to synchronize before switching online a generator, aka the sinus waveforms need to match in frequency and in angle but how about the voltage? I do realize that every generator out there in a large plant is switched to the grid via a transformer which usually steps up the stator voltage to line voltage which then is fed into the high voltage lines that come to the station.
The question is do all of these transformers located at different plants with different sized generators have to be synchronized in terms of their secondary winding (the one attached to the HVAC grid) so that the voltages are the same?
For example in my country we have three large Hydro plants, they are all connected by 330Kv HVAC lines but their capacity differs so I assume the generator stator output voltage also differs so the transformers need to be made so that the secondary voltages are the same?Another question, what would happen if for example I had a generator attached to the grid via a transformer but somehow suddenly my generator would output a lower voltage while everything else stayed in sync, (I know synchronous generators don't work this way but this is just a thought question) in other words the frequency and angle stays the same just the amplitude of the sinewave decreases aka voltage decreases, obviously the transformer secondary output would also decreases yet it is still attached to the grid , what happens? is the generator still able to supply energy to the grid even though its output voltage is lower than that of the grid or does energy now flow from he grid into the generator?
In a given area there are different types of power plants , let's assume they are (coal, nuclear, wind and solar) Now as I have learned most of these plants (except solar and some others) use synchronous generators as the last step between mechanical energy conversion into electricity.
But since the plant sizes and output power (thermal) differ from one to another I assume also the generator sizes, rotor pole count and stator winding size and turn ratio differs correct?
If this is so then I also assume that the output voltage of the stator windings is different say from a 1000MW rated 10 generator Hydro plant to a single nuclear reactor two turbine/two generator set plant and maybe even differ from a single generator single turbine coal plant correct?
So by now I know that in AC grids it is important to synchronize before switching online a generator, aka the sinus waveforms need to match in frequency and in angle but how about the voltage? I do realize that every generator out there in a large plant is switched to the grid via a transformer which usually steps up the stator voltage to line voltage which then is fed into the high voltage lines that come to the station.
The question is do all of these transformers located at different plants with different sized generators have to be synchronized in terms of their secondary winding (the one attached to the HVAC grid) so that the voltages are the same?
For example in my country we have three large Hydro plants, they are all connected by 330Kv HVAC lines but their capacity differs so I assume the generator stator output voltage also differs so the transformers need to be made so that the secondary voltages are the same?Another question, what would happen if for example I had a generator attached to the grid via a transformer but somehow suddenly my generator would output a lower voltage while everything else stayed in sync, (I know synchronous generators don't work this way but this is just a thought question) in other words the frequency and angle stays the same just the amplitude of the sinewave decreases aka voltage decreases, obviously the transformer secondary output would also decreases yet it is still attached to the grid , what happens? is the generator still able to supply energy to the grid even though its output voltage is lower than that of the grid or does energy now flow from he grid into the generator?