The so -called power curve is a series of specified data pairs (VI, PI) described by wind speed (VI) as a horizontal coordinate and a effective PI as a vertical coordinate. Under the condition of standard air density (= = 1.225kg/m3), the relationship between the output power of the wind power unit and the wind speed is called the standard power curve of the wind turbine.
The use coefficient of wind energy refers to the ratio of the energy absorbed by the impeller to the wind energy flowing from the entire impeller plane. It is expressed by CP, which is the percentage rate that measures the energy absorbed by the wind unit from the wind. According to the theory of Bez, the maximum wind energy utilization coefficient of the wind turbine is 0.593, and the size of the wind energy use coefficient is related to the angle of the leaf clipper.
The ratio of wings -type lift and resistance is called lift ratio. Only when the lift ratio and the sharp speed ratio are approaching infinitely, can the use coefficient of wind energy approach the Bez limit. The actual rising ratio and sharp -rate ratio of the wind turbine will not approach infinite. The actual wind energy utilization coefficient of the wind turbine cannot exceed the wind energy utilization coefficient of the ideal wind turbine units with the same lift ratio and pointed speed ratio. Using the ideal blade structure, when the resistance ratio is less than 100, the actual wind power utilization coefficient of the actual wind power unit cannot exceed 0.538.
As far as the control algorithm of the wind turbine is concerned, there are no control algorithms that integrate all advantages. Design high -performance wind turbine control strategies need to be aimed at the specific wind energy environment, take into account the cost of control and control, and maximize the quantitative control indicators to achieve multi -target optimization design. When optimizing the power curve, it should take into account the parts and unit life, failure probability, and power consumption of the unit. In principle, this can indeed increase the CP value of the low air speed segment, which will inevitably increase the working time of the wheel parts. Therefore, this modification may not be desirable.
Therefore, when selecting a model, the comprehensive performance of the unit should be considered. For example: the unit is convenient, the cost of long -term maintenance and maintenance is low, and most of the faults can be checked and diagnosed by remotely; when optimizing the power curve to improve the efficiency of the crew, various factors should be comprehensively considered to avoid the life of the unit component and long -term long -term Maintenance costs cause adverse effects and obtain better electricity costs.
Post time: Jun-29-2023
