Control of wind turbines

A method of controlling a plurality of wind turbines connected to a common node from which power generated by the plurality of wind turbines is exported by at least one power collection cable, the method comprising:

• generating and outputting an overrating control signal to the plurality of wind turbines, the overrating control signal setting an amount by which the power output of the plurality of wind turbines is to be overrated;
• measuring cable temperature values for the at least one power collection cable using at least one cable temperature sensor;
• determining whether the measured cable temperature values exceed a temperature set point;
• and
• modifying the overrating control signal of at least one of the wind turbines to reduce the amount of overrating if the measured cable temperature values exceed the temperature set point.