Patent ID: 6674267
Filing Date: 2004-01-06
Classification: H02J,Y02E

Abstract:
A method for compensation of the compensating a reactive power consumption of an industrial load, supplied from a three-phase electric AC network including a first compensation device for controllable consumption of reactive power and a second compensation device for generation of reactive power, both of said first and second compensation devices being connected to the AC network in a parallel connection with the industrial load, the first compensation device comprising a thyristor-controlled reactor for each of the phases of the AC network, the method comprising:sensing an amplitude value for a voltage for each of the thyristor-controlled reactors, said voltage representing a voltage across a respective thyristor-controlled reactor; forming a voltage mean value as a mean value of said amplitude values; forming an amplitude deviation for each of the thyristor-controlled reactors as a difference of the voltage mean value and the amplitude value associated with the respective thyristor-controlled reactor; forming a separate control order for phase-angle control of each of the thyristor-controlled reactors, said control order being dependent on the amplitude deviation for the respective thyristor-controlled reactor; and determining an instantaneous consumption of reactive power by the industrial load, said control order being further dependent on the instantaneous consumption of reactive power by the industrial load.