Abstract
In order to improve the power output of wind turbine at low wind speed, this paper studies the aerodynamic performance of wind turbine blades at different installation angles. It is found that the optimal pitch angle of wind turbine can be switched between different installation angles when wind speed changes by introducing wind turbine speed differential feedback signal in PI controller of variable pitch, so as to track the optimal wind energy utilization coefficient The purpose of improving wind turbine power output. In order to verify the reliability of the analysis results, bladed is used to simulate the model of a 1.5MW unit with pitch differential control signal. At the same time, the research results are applied to the actual operation of the unit. The results show that the power curve of the wind turbine unit at low wind speed can be improved and the annual power generation can be increased by 1.24%.
Highlights
The main control technology of wind turbine is variable pitch and variable speed control technology[1]
In the actual operation process, the total control strategy of wind turbine is that when the wind speed is lower than the rated wind speed, the blade pitch angle is always maintained at 0 ° and the maximum wind energy is captured by adjusting the wind turbine speed[2]-[4]; when the wind speed is higher than the rated wind speed, the wind turbine speed remains unchanged
In this paper, based on the existing wind turbine control technology, through the analysis of the aerodynamic characteristics of wind turbine blades, it is found that when the wind speed is low, fine tuning the blade pitch angle can improve the aerodynamic performance of the blade[6]-[7]
Summary
The main control technology of wind turbine is variable pitch and variable speed control technology[1]. In the actual operation process, the total control strategy of wind turbine is that when the wind speed is lower than the rated wind speed, the blade pitch angle is always maintained at 0 ° and the maximum wind energy is captured by adjusting the wind turbine speed[2]-[4]; when the wind speed is higher than the rated wind speed, the wind turbine speed remains unchanged. This paper introduces low wind speed pitch control strategy into the wind turbine controller to improve the generation efficiency of wind turbine at low wind speed
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