Electric generator control system and method

A method for controlling an electric generator connected to a power grid by a back-to-back converter comprising a generator side converter and a DC-link connected in series, the method comprising:

• connecting a rectifying unit in parallel to the generator side converter and in series to the DC-link,
• connecting a semiconductor unit comprising a first thyristor, connected in series between a positive pole of the DC-link and a DC output of the rectifying unit, and a second thyristor, connected in series between a negative pole of the DC-link and a DC output of the rectifying unit, and
• in response to a voltage drop in the power grid, controlling the rectifying unit to conduct an energy excess in the generator towards the DC-link.