There has been some confusion among my peers regarding the following circumstances. Often during the design of a ground grid, an engineer will specify that overhead shield wires from incoming lines must be tied into the ground grid prior to energization for a safe system. I've been told by a few...
K - if that's true I think that answers my question then. So the generating turbines ultimately compensate for system wide transient power imbalances by accelerating or decelerating therefore absorbing or producing excess power (within realistic limits until they could become damaged)? Since...
Thanks for the responses, that helps a bit.
I think I'm getting closer to understanding. Pin=Pout is really the sticking point of this issue. At steady state lets say Pin = 100MW and Pout = 100MW. Now 1MW of load is lost. Examining this transient period of time - Pin is still 100MW because...
No, I just want to mathematically understand the effect of power imbalance on the grid?
Everyone I ask tells me the frequency goes up or down and there are control systems in place to adjust the generation as needed. That's all well and good but I want to understand why exactly the frequency...
I could rephrase the same question, why does the frequency decrease when load exceeds generation?
I know these are fundamental operating characteristics of a power system network but I'm not sure I can mathematically prove it. My best guess is that everything dissipates more power when the...
Gotcha.
So if someone told you there was a 10MVA load consuming 8+6J MVA, and asked you what S produced was for the generator at the other end of the line, you would say 8+6J?
Easy enough.
Thanks for the response, funny you pointed out the error in my nomenclature as I've been trying to decipher it in my head for the last hour myself. I think I just proved it to myself though and understand it now. Made a new post about that issue actually.
I've read through a lot of old threads on this, and I admit I still do not fully understand. I just want to double check this.
S = P + jQ. The sign of Q is completely dependent on whether the load is leading or lagging, AND which convention you take the sign of P to be in.
For example. For...
Well in this (slightly hypoothetical) situation we're going to say the utility doesn't care about power factor. The .95 lagging to .99 leading is a characteristic of what the facility is capable of doing. So there wouldn't really be a conflict.
If you need to raise voltage, and you were...
Thanks - so lets say the situation is as follows.
System study was completed and the aggregate wind farm, at the POI on the high side of the GSU substation is capable of operating at between a .95 lagging to .99 leading power factor. (The farm maxes out at .99 leading likely because of the...
I have a question in regards to a project I'm involved with. Specifically, this is a Wind Farm generation facility although the answer to my questions does not necessarily have to be specific to wind farms. The turbines at this particular facility are DFIG machines that are capable of...
