Patent ID: 9716384
Date: 2017-07-25
CPC Classifications: F03D,H02J,H02P,Y02E

Claim:
1. Control method of a wind farm, the wind farm comprises an array of wind turbines, each wind turbine of said array of wind turbines comprising a rotor, a generator, a control unit and means of connection to the wind farm, said wind turbines being endowed with means for generating reactive power following instructions of a control system of the wind farm, said method comprising the step of calculating a global demand for reactive power to be produced by the entire farm on the basis of a voltage at a connection point or a power factor, wherein said method further comprises the following steps: receiving one or several thermal parameters from each wind turbine providing information on values of temperatures of electrical components included in each wind turbine; calculating, on the basis of the global demand for reactive power and of the values of the thermal parameters received, the instructions for reactive power production for the different wind turbines which reduce the values of the temperatures of the electrical components of those wind turbines displaying greater heating, the instructions for reactive power production collectively satisfying the global demand for reactive power and; sending said instructions to each wind turbine, wherein the thermal parameters providing information on the values of the temperatures of the electrical components included in each wind turbine comprise at least: a first thermal parameter comprising a heating index, calculated in accordance with at least the following steps: a second thermal parameter calculated for the hottest electrical component indicating the effect which a production of inductive reactive power has on a temperature of the hottest electrical component; wherein the reactive power production is distributed according to a method comprising the following steps: selecting the wind turbine with a greatest heating index; modifying the reactive power instructions corresponding to the wind turbine with the greatest heating index on the basis of the second thermal parameter in order to reduce electrical losses in a hottest electrical component of the wind turbine with the greatest heating index.