Synching Feeling
Synching Feeling
(OP)
What is it that hold a generator in synch with the rest of the grid. My way of thinking, the magnetic field produced by the generator must be of opposite polarity as the magnetic field of the grid...so they attract each other.
Is that close...? Or should I go ahead and take that fuel handler job they just posted...
Is that close...? Or should I go ahead and take that fuel handler job they just posted...






RE: Synching Feeling
cheers
RE: Synching Feeling
RE: Synching Feeling
AS a CRO, I know how to make the turbine generator operate...I'm just wanting a better understanding of why it works that way.
I reckon it follows then, that the grids alternating voltage would tend to oppose allowing the generator speed to either slow OR speed up (to a point). If you increase the torque of the prime mover without a corresponding strenghtening of the generators magnetic field, it is possible then to overpower the the grid. Is that correct?
Or...if you reduce the prime mover, you would need to decrease excitation as well.
I sorta get this. I was always told the prime mover directly controls MW load, while excitation controls voltage...but I never could see how this happened independently. It seems to me that while this may be true, one without the other doesn't go too far.
Let me try to follow what I think I think...
If you increase the prime mover in order to increase generator load, then the corresponding excitation needs to be increased to maintain proper voltage. The strengthened magnetic field then has more lines of flux cutting thru the stator winding...Is this why load actually increases?
Thanks in advance for helping me out. If my questions seem a bit novice, I apologize in advance.
RE: Synching Feeling
With the shaft supplying a constant power, changing the internal voltage produced by the generator will change the power angle, but will not change the amount of power.
The amount of reactive power is the product of the magnitudes of the two voltages divided by the reactive impedance, multiplied by the cos of delta, all that minus the square of the magnitude of the system voltage divided by the reactive impedance. Increasing the internally generated voltage (increasing the field current) increase the reactive power delivered by increasing the product of the magnitudes of the voltages. In response to that increase the power angle reduces so that the real power output remains constant (controlled by the power in at the shaft). The reduction in power angle increases the cos value, so reactive power output goes up with both the increase in generated voltage magnitude and with the decreased power angel.
If someone else knows how to put the equations in here so they show up well formatted, that would be great.
RE: Synching Feeling
This article explains operation of a network connected geneartor fairly well.
http://b
RE: Synching Feeling