Flexible expansion control method and system for cut-out wind speed of megawatt wind turbine generator

Abstract

The invention discloses a flexible expansion control method and system for the cut-out wind speed of a megawatt wind turbine generator. The method is characterized by comprising the following steps that Step 1, a preset load matrix composed of multiple load elements in a wind turbine generator application site is obtained; Step 2, the real-time load of the wind turbine generator is compared with a preset load matrix, whether to carry out cut-out wind speed flexible expansion control or not is analyzed and judged, if so, the next step is performed, and otherwise, normal cut-out wind speed control is performed; Step 3, cut-out wind speed flexible expansion control is performed by adjusting the power characteristics of the wind turbine generator; and 4, when the cut-out wind speed flexible expansion control runs to the set time or one load element in the wind turbine generator application site exceeds the preset load matrix range, the wind speed flexible expansion control ends, and the normal cut-out wind speed control begins. According to the method, the performance potential of the unit is fully excavated, the energy capture of a high-wind-speed section is increased, the cut-out and re-cut-in processes are reduced, the overall batch trawling of a wind field is reduced, and the power grid friendliness is high.

Description

technical field [0001] The invention relates to a flexible expansion control method and system for cut-out wind speed of a megawatt wind turbine, and belongs to the technical field of cut-out wind speed control of a megawatt wind turbine. Background technique [0002] Existing megawatt-level wind turbines, when the wind speed measurement sensor detects that the instantaneous value or average value of the measured wind speed is greater than the corresponding design threshold of the wind turbine, the main purpose is to directly shut down and disconnect the grid. Reduce the aerodynamic load on the wind rotor and ensure the safety of the unit, which is commonly referred to as "cut-out shutdown". The advantages of this rigid "cut-out shutdown" control are: simple logic, easy engineering implementation, and guaranteed unit safety. Its shortcomings are also very obvious: collective off-grid, poor grid friendliness, waste of unit design margin, and loss of "gale" wind energy captur...

AI Technical Summary

Problems solved by technology

This approach will cause the unit to shut down immediately when it exceeds the environmental adaptation range, which is not friendly to the power grid and also loses the ability to capture "strong winds"

However, simply increasing the cut-out wind speed will inevitably lead to an increase in the load of the wind turbine under the cut-out wind speed condition, especially the fatigue and ultimate load of the blades, connecting bolts, towers, yaw bearings, hubs and other components, affecting The safety of the unit, the purpose of the present invention is to ensure that the wind turbine does not go off-grid during the "gale" period, while taking into account the load safety, and to improve the wind energy capture capacity of the "gale"

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