Generator Terminal Output Voltage Regulation & Automatic P.F Control Problem

I have not heard generators working in PF control mode. The only thing I have heard is voltage control mode.

However, it is not difficult to understand the reactive power control mode. The reactive power output is regulated by varying the generator terminal voltage so that constant reactive power output results. The voltage is therefore not controllable and is controlled by the reactive power output constraints.

If you therefore have a load connected with low PF , your generator voltage will be increased substantially to a very high value so that reactive power output is obtained to the desired value by increasing load reactive power demand with increased voltage. However, this may not control power factor as the active power is also likely to increase with increased generator voltage.

The converse is true for high lagging load power factor. The terminal voltage of the generator will be reduced to match desired reactive power output. But again, the active power output is likely to be reduced and power factor may not be controlled.

Thinking again, I think, this is a case of reactive power control rather than PF control.

I will use plain language. If I understood the question, it will make sense. If I misunderstood, it will highlight it.

A generator standalone generates whatever it generates, and sensibly it is controlled for output voltage only (never mind protection circuits). You want stable voltage, and definitely no overvoltage beyond transients for the load. The generator's reactive part is low, that the load's reactive part establishes the angle between the node's voltage and current. That is IT. And it does not matter, until you have a very mixed bag for a load.

With a single generator (as I understood for your exercise), one can establish ONE value stable (in this case voltage). To do more, you need more equipment (in this case for phase), much preferably on the load side. Phase correction (or PF) is common in or for load equipment at the user's premises. Diverse loads can then correct for diverse PF.

I think that you did not understand the meaning of the P.F. control Mode (if it is on this genset).

Maybe if this genset is connected in parallel with another unit or the grid, then you will see the operation of the P.F.Control working to create more or less reactive power to compensate the load P.F. vis-a-vis the grid or the other gensets.

Meaning that this genset can be used to produce reactive power when in parallel and not when in single island use, where the P.F. is dictated by the load only.

The P.F. control of the type LAA_Lucke explained, is possible with manual control.

I have not come across a generator that takes PF of other generators for its AVR control, for purpose of P.F control.

Is there any references, where generators in parallel mode have AVR control to control PF?

Sorry I do not have any references of this kind.

But this is not necessary to have a specially dedicated or purposefully made AVR for P.F. control. power generation companies could use Synchronous Alternators on their grid for the sole purpose of power factor correction. this used to be the case before of more sofistications...

In our case, for relatively small installations, where no P.F. correction with capacitor is available, One particular set could be set such that it will take most of the reactive load through proper setting of the load sharing.