Wind speed prediction model-based wind power prediction method considering fan inflow angle

Abstract

The invention relates to a wind power prediction method based on a wind speed prediction model and considering a fan inflow angle. The method includes: drawing a contour line for the topographic information of each fan; establishing an inflow angle operator model according to the terrain contour line and the 0-360-degree predicted wind direction rose diagram; the terrain gradient complexity is calculated; dividing the wind direction rose diagram into a plurality of sectors at 0-360 degrees, establishing an inflow angle sector model of each fan in each sector at a fixed inflow angle approximation, substituting the predicted wind direction angle into the established sector model to obtain a corresponding inflow angle, and taking a corresponding inflow angle COS value as a correction factor of fan power prediction calculation. The method can practically improve the accuracy of fan power prediction, and has important significance for improving the power prediction level of the wind power plant, meeting the accuracy assessment of a power grid company, making an overhaul plan, mastering the predicted power of the whole-grid wind power plant by the power grid company, arranging overhaul and making a power generation plan, and improving the absorptive capacity of the wind power plant.

Description

Technical field: [0001] The invention relates to the technical field of wind power, in particular to a wind power prediction method based on a wind speed prediction model taking into account the inflow angle of a fan. Background technique: [0002] Wind power prediction technology refers to the prediction of the output power of wind farms within a period of time in the future. The wind speed-based prediction method targets a single wind turbine, predicts the wind speed near it according to the wind speed model, and then calculates the actual output wind power by using the wind power curve. power. [0003] The current method based on wind speed prediction only considers the wind speed near the height of the fan hub, and calculates the output power according to the curve fitted by the wind speed and the fan output power. The default airflow direction is consistent with the horizontal axis of the wind turbine, and the rotation plane of the fan impeller is perpendicular to the a...

AI Technical Summary

Problems solved by technology

[0003] The current method based on wind speed prediction only considers the wind speed near the height of the fan hub, and calculates the output power according to the curve fitted by the wind speed and the fan output power. The default airflow direction is consistent with the horizontal axis of the wind turbine, and the rotation plane of the fan impeller is perpendicular to the airflow direction , does not consider the angle between the airflow direction and the horizontal axis of the wind turbine (inflow angle) caused by the terrain where the fan is located

Especially for wind turbines installed on the ridges of wind farms in mountainous areas, due to the large terrain slopes on both sides of the mountain ridges, especially the steep walls, the problem of large inflow angles is often caused. Large inflow angles worsen the force on the wind turbines and affect the power generation output of the units. Fan power prediction results have a greater impact

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