Method for compensating reactive power, associated control system, and sensor driver circuit

A control system for controlling a full bridge converter to compensate the reactive power consumed by at least one inductive position sensor for a rotor of an electrical machine supported by at least one active magnetic bearing, the inductive position sensor measuring a displacement of a rotor and being supplied by an alternating current source, the control system comprising:

• a phase shift determining means configured to determine the phase shift between a supply voltage and a supply current delivered by the alternating current source,
• a first control loop configured to control the amplitude of a control signal from the determined phase shift,
• a second control loop configured to control the phase of the control signal from the voltage of the energy storage device and a voltage reference,
• a third control loop configured to control a voltage reference for an energy storage device from the amplitude of the control signal and a duty cycle reference value, and
• a controlling means configured to control the full bridge converter according to the control signal to generate the compensation current to bring the supply current in phase with the supply voltage.