The usual method for the reactive energy compensation in industrial networks consist of the connection of capacitors, sometimes fixed or switched by automatic power control regulators. However the direct connection of capacitors to the distribution network is not always admissible for different reasons such as:*Presence of harmonic currents generated by non linear loads.*Possibility of resonances between the power factor correction capacitors and certain inductive loads or even the leakage inductance of the supply transformer.*Presence of drop outs or other disturbances in the voltage, due to capacitor switching transients, specially in case of low short circuit power at the point of coupling.*Attenuation of high frequency command signals transmitted through the network.When such problems occur it is necessary to add reactances, either to match with the capacitors and filter the disturbances or to obtain an adequate rejection for the harmonics or for the HF signals and adapt to the int