SYSTEM FOR USING ENERGY STORED IN THE MECHANICAL INERTIA OF THE ROTOR OF A WIND TURBINE

摘要

The invention relates to a system for using the mechanical energy stored in a rotary element in order to contribute to the dynamic stability and frequency control of the network to which said rotary element is connected. The inventive system is primarily intended for use in the field of aerogenerators in which the inertial energy stored in the rotor of said aerogenerators can be used. Said system comprises two back-to-back power converters, a rectifier (4) and an inverter (6) with a control system (16) that generates the transfer torque Topt which ensures optimum energy capture for any wind speed. Said system comprises two additional torque components: the first DELTA Tf at the output of the control block (20) with the purpose of ensuring that the frequency of the distribution network follows a reference frequency the second component, comprising a torque generated by the control block (18), performs the gain calculation for torque DELTA Ti in order to help improve the dynamic stability of the distribution network. In this way, the system is provided with an inertial torque which is similar to the equivalent inertial power of a synchronous generator connected to the distribution network of a standard generating station. As a result, reference torque Tref is obtained which is the torque set point that the rectifier circuit (4) will have to follow so that the electric torque of the generator (3) follows said reference and so that the control objectives are achieved.