Wind-power generator maximal wind-energy capture control method based on self-adaptive theory

Abstract

The invention belongs to the filed of wind-power generator control and relates to a wind-power generator maximal wind-energy capture control method based on a self-adaptive theory, which is characterized in that firstly n wind speed values are selected from the cut-in wind speed to the rated wind speed of a wind-power generator, wherein each wind speed value corresponds to a rotating speed value so that a rotating speed point range is formed, and each rotating speed value corresponds to one modifying factor. The control method comprises the following steps of: 1. judging whether the sampled rotating speed value is in the selected rotating speed point range or not, if so, carrying out the primary setting of the operation mode of the wind-power generator of a step 2, and otherwise, directly carrying out the secondary setting of the operation mode of the wind-power generator of a step 4 without updating the modifying factor, and still adopting a maximum power curve which corresponds to the current modifying factor to control the torque of the wind-power generator according to a given result of the step 4; 2. carrying out the primary setting of the operation mode of the wind-power generator; 3. updating the modifying factor; 4. carrying out the secondary setting of the operation mode of the wind-power generator; and 5. controlling electromagnetic torque of the generator. The invention can reduce the influence of the aerodynamic characteristic parameter variation of the wind-power generator on system control and is helpful for improving the efficiency of wind energy capture of the wind-power generator.

Description

technical field [0001] The invention belongs to the field of wind power generator control, in particular to a method for controlling the maximum wind energy capture of a wind power generator. Background technique [0002] In the variable speed constant frequency wind power generation system, when the wind turbine is running below the rated wind speed, it is necessary to continuously adjust the electromagnetic torque T of the generator e To change the wind turbine speed ω r , to track the optimal speed value ω r_opt , so that the wind generator operates at an optimal operating point (Optimal Operating Point referred to as OOP in the present invention), so that the wind generator can capture more wind energy. In recent years, researchers at home and abroad have proposed a series of control strategies for the maximum wind energy capture of wind turbines. Some of the control methods need to obtain more information about the aerodynamic characteristics of the wind turbine, as ...

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Problems solved by technology

Some of the control methods need to obtain more information about the aerodynamic characteristics of the wind turbine, as well as wind speed information. Invariant, etc.), but the deviation caused by the measured wind speed and the factors such as the change of the aerodynamic characteristics of the wind turbine with the running time will affect its control effect; other control methods require less wind turbine information, such as the hill-climbing search method Although there is no need to measure the wind speed, the required information is very little, and the operation mode of the next control cycle of the wind turbine can be given only by judging the change of the captured power of the wind turbine. However, the moment of inertia of a large wind turbine is very large, and the speed response is difficult. Increase, wind speed fluctuations will cause the wind turbine to change the operating state of the wind turbine due to changes in the power increase and decrease of the wind turbine when the wind turbine does not reach the optimal speed, so the actual speed of the wind turbine will continue to deviate from the optimal speed. Rotational speed, especially when the sudden change of wind speed is very serious, the control signal given by the controller may cause the wind turbine to always run away from the optimal speed

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