Dynamic Voltage Regulator?

It wouldn't be much of a regulator if it was dependent on a known impedance. It will be likely to have a practical range of operation somewhere between short circuit and open circuit where the regulation is within a given amount of (tolerance) variation. When you have conditions outside the range is when it gets to be interesting...

From the IEEE:

"...The paper presents the structures and control of a dynamic voltage regulator (DVR) that injects voltage in series with a distribution feeder. This is a power electronic controller that can protect sensitive loads from disturbances in the supply system. It is demonstrated that this device can tightly regulate the voltage at the load terminal against imbalance or harmonic in the source side. It is stipulated that the device does not supply any real power in the steady state. To accomplish this, the behavior of the device is first studied through steady state analysis and then this analysis is extended for the transient operation. Two suitable structures in which the DVR is realized by voltage source inverters along with filter are also discussed. A deadbeat output feedback controller for these DVR structures is designed. Extensive simulation results are included to illustrate the operating principles of the DVR..."

As far as I understand it is not electronic but a rotary machine with inertia (there are different options of forming inertia, including doubly fed machine).

Also it does not inject through a reactor.

In fact it feeds load through a tapping on a reactor. The purpose of the reactor is that DVR does not support the Grid but the load on disturbance as a Finite Size relatively small machine can not support Infinite Size Grid under disturbance.

Yes, Grid information (Maximum Short Circuit Capacity) is required to size the Reactor and the tap - but only once for purpose of designing of Reactor and location of tap (Grid side and load side reactance values for maximum power Transfer from DVR to Load).

Since DVR is isolated from Grid via Series Reactor so that AND hence its performance does not depend upon parameters of Grid.

..which means "no".

Its interesting to disscuss of it... thanks every one.. so may I conclude that DVR does need only real time measurement of voltage level.

Short circuit power will be used during design phase. So for operation there is no need for any other information (except voltage) ?

I think the point here is that your supply voltage is what you wish to provide. The distorted voltage is what you wish to protect yourself from.

Perhaps you should talk to the manufacturers representative for more details.