Method and device for reducing voltage imbalances in a three-phase network by means of a static compensator

A device for reducing voltage imbalances in a three-phase network, comprising:

• a static compensator;
• a voltage control circuit generating a susceptance mean value and controlling the static compensator, the voltage control circuit including individual comparison circuits producing voltage imbalance values;
• a balance control circuit generating correction signals and controlling the static compensator, each of the correction signals being proportional to a corresponding one of the voltage imbalance values;
• and
• a conditioning circuit having a conditioning input side and a plurality of conditioning output sides, the conditioning input side being coupled to a plurality of voltage converters for receiving line-to-earth voltages, the voltage control circuit coupled to one of the plurality of conditioning output sides for receiving line-to-line voltages, the balance control circuit coupled to another one of the plurality of conditioning output sides,
• wherein each of the voltage imbalance values is generated by comparing a corresponding one of the line-to-line voltages with different ones of the line-to-line voltages of the three-phase network, the line-to-line voltages being determined from the measured line-to-earth voltages of the three-phase network, and
• wherein each of the correction signals are superimposed on the mean susceptance value of the static compensator to generate phase-related susceptance values.