8 results about "Variable speed wind turbine" patented technology

The invention discloses a predefined space-time pitch angle control method of a variable-speed wind generating set, and belongs to the technical field of variable-speed wind generating set control. The method is characterized by comprising the following steps of 1, obtaining a dynamic model of the variable-speed wind turbine according to the Betz theory; step 2, obtaining a predefined space-time reaching law with a buffer area according to the improved barrier function; 3, constructing a sliding mode variable, and converting a non-affine model of the variable speed wind turbine into an affine model based on an unknown smooth nonlinear function; and 4, compensating the unknown smooth nonlinear function by using a neural network, and obtaining a pitch angle controller according to the neural network. According to the predefined space-time pitch angle control method of the variable-speed wind generating set, the state space is divided into the multiple parts including the buffer areas, dependence on model parameters is reduced, the buffeting phenomenon is weakened through the improved obstacle function, and then the power generation efficiency is improved, and the operation cost is reduced.

A variable speed wind turbine maximum power capture method, system and application thereof, the method is based on active disturbance rejection control, RBF neural network and variable speed wind turbine maximum power capture method, including the following steps: establishing the equivalent model of variable speed wind turbine; using the second order linear active disturbance rejection control (LADRC) algorithm to construct the generator torque controller; using the gravity search algorithm to optimize the generator torque controller parameters and obtain the optimal parameter data set; based on the optimal parameter data set, the radial basis function neural network is trained, and the trained radial basis function neural output is suitable for the generator torque controller parameters under the current wind speed condition. Using the gravity search algorithm to optimize the generator torque controller parameters and obtain the optimal parameter data set; based on the optimal parameter data set, the radial basis function neural network is trained, and the trained radial basis function neural output is suitable for the generator torque controller parameters under the current wind speed condition.

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.

An axis-variable, contra-rotating wind turbine is disclosed. The axis-variable, contra-rotating wind turbine according to the present invention comprises: a tower; spline shafts horizontally connected to both upper sides of the tower; main rotors respectively coupled to the spline shafts on both sides so as to be axially movable and configured to contra-rotate to convert wind energy into mechanical energy; a main actuator having one end connected to the main rotors and the other end connected to the tower, and configured to move the main rotors on both sides in the axial direction of the spline shafts so as to adjust the distance between the main rotors; and a nacelle that converts mechanical energy transferred to the spline shafts into electrical energy, wherein the rotors are moved in the axial direction of the spline shafts by means of the main actuator to adjust the distance between the main rotors on both sides, such that the amount of generated power can be maximized.

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.

The present application belongs to the technical field of variable speed wind turbine generator set control, and more particularly to a wind turbine active power coordinated control method and device based on wind speed estimation. The method comprises: S1, under turbulent wind conditions, using an extended Kalman filter to estimate wind speed to obtain an estimated wind speed variation in a set sampling period; S2, setting a variable speed interval Π(ω r ,ω low ) of a wind wheel speed ω up and a kinetic energy utilization adjustment coefficient α, and updating the kinetic energy utilization adjustment coefficient α using the wind speed variation; S3, using the updated kinetic energy utilization adjustment coefficient α to calculate a second speed regulation error e2 when the wind wheel speed ω r is in the interval Π(ω low ,ω low +α), and calculating a target speed regulation error e according to a first speed regulation error e1 and the second speed regulation error e2 in an RSC method; and S4, using the target speed regulation error e to perform coordinated active power control of a pitch angle and torque facing wind wheel rotor kinetic energy regulation. The present application realizes that a variable speed wind turbine generator set can be regulated according to grid requirements, while reducing the pitch angle regulation frequency and reducing the load of the pitch system.

A self-disturbance-resistant wind power grid-connected power system frequency fluctuation suppression method, system and medium, the method comprises the following steps: a wind power grid-connected system frequency dynamic response model containing variable speed wind turbine is established; based on the wind power grid-connected system frequency dynamic response model, the real-time state of the system frequency deviation is observed, the comprehensive disturbance in and outside the system is estimated, the active power output of the variable speed wind turbine is adjusted in real time to respond to the change of the grid frequency; real-time monitoring of the error between the system frequency deviation and the target frequency deviation, further adjusting the active power output of the variable speed wind turbine, realizing the wind power grid-connected frequency fluctuation suppression. The frequency response characteristic of the wind turbine is improved, and the influence of wind power fluctuation on the system frequency is reduced.