3 results about "Variable speed wind turbine" patented technology

The utility model relates to the technical field of wind generating sets, in particular to a variable-pitch variable-speed wind generating set. Comprising a flow guide cover, a mounting cover is mounted in the flow guide cover, an inner cavity is formed in the mounting cover, an electric heating wire is mounted in the inner cavity, a heat conduction plate is mounted at the position, close to the electric heating wire, of the mounting cover, a fan is mounted below the mounting cover, the outer side of the fan is connected with an air filter through a pipeline, and an adjusting motor is mounted in the mounting cover; the output end of the adjusting motor is connected with a first speed reducer, and the upper portion of the first speed reducer is connected with a second speed reducer through a transmission shaft. An electric heating wire heats a heat conduction plate and the interior of an inner cavity, air enters the inner cavity through a draught fan, the heated air enters a mounting cover to guarantee the environment temperature when a first speed reducer, a second speed reducer and a paddle bearing work, and in this way, the situation that the device works under the low-temperature condition can be avoided; therefore, abrasion between mechanical parts is reduced, and the maintenance cost of the device is reduced.

The application belongs to the field of control and energy, and particularly discloses a linear optimal output regulation control algorithm for a variable-speed wind turbine in a low wind speed area, which comprises the following steps: linearizing a nonlinear system of a transmission shaft model and a tower model of a wind turbine in a low wind speed area at an equilibrium operating point; constructing an external dynamic system capable of generating a disturbance wind speed signal and a linear wind turbine system controlled output tracking signal by using wind speed measurement data of a continuous wave laser radar; defining a controlled output tracking error, and designing an output regulation control rate containing feedforward and feedback control for the linear wind turbine system based on asymptotic convergence of the tracking error to zero; and obtaining a linear optimal output regulation control rate on the basis of the linear output regulation control rate by using coordinate transformation and minimizing a performance index function containing fatigue load.

The present disclosure provides a method and device for primary frequency modulation control of a variable-speed wind turbine generator set, which comprises detecting a grid frequency and obtaining active power corresponding to the grid frequency; detecting a wind speed and a rotor speed of the wind turbine generator set, and obtaining a rotor radius, air density and gear box speed ratio, and then obtaining a wind energy absorption coefficient, an optimal gain of the wind turbine generator set and a maximum power corresponding to the wind speed; obtaining a frequency modulation gain based on the active power, the maximum power and the optimal gain; obtaining a frequency modulation torque instruction based on the frequency modulation gain, and performing primary frequency modulation on the variable-speed wind turbine generator set based on the frequency modulation torque instruction. The method according to the present disclosure can solve the problem that the wind turbine generator set without a variable-pitch actuator cannot respond to frequency modulation power.