Control of a dfig grid side converter

A method for controlling a reactive power exchange of a Doubly-Fed Fed Induction Generator (DFIG) wind facility with a grid, the DFIG wind facility comprising a utility grid connected grid side converter connected via a DC link and a rotor side converter to a rotor of a DFIG, the method comprising:

• determining a grid side converter reactive power thermal limit value;
• determining a value of a required DFIG magnetizing reactive power to be consumed by a stator;
• setting dynamically a sharing of a reactive power between the stator and the grid side converter such that the grid side converter reactive power value is a difference between a reactive power demand of the DFIG wind facility and the magnetizing reactive power consumed by the stator;
• operating the DFIG wind turbine facility such that an absolute value of grid side converter reactive power is adjusted to be below the grid side converter reactive power thermal limit value value;
• in case a total DFIG reactive power demand is greater than zero:
• controlling the grid side converter to supply reactive power to serve the total DFIG reactive power demand according to a maximum possible degree so that the grid side converter operates within a thermal limit, so that a thermal limit of the grid side converter is not exceeded.