Wind generating set blade load measurement device and measurement method thereof

Abstract

The invention discloses a wind generating set blade load measurement device. The wind generating set blade load measurement device comprises at least three fiber bragg grating sensor arrays, a demodulation module and a load data processing module, wherein each fiber bragg grating sensor array is formed by connecting at least four fiber bragg grating sensor groups in series sequentially; each fiber bragg grating sensor group consists of a strain sensor and a temperature sensor; the strain sensor is used for measuring the strain amount of a blade when the blade is loaded; the temperature sensor is used for compensating the temperature drift of the strain sensor caused by the ambient temperature change; the demodulation module is used for converting the signals of each strain sensor and each temperature sensor into corresponding strain amount values and temperature values respectively; the load data processing module is integrated with a load algorithm to process the strain amount value and the temperature value of each measurement point, convert the strain amount value and the temperature value of each temperature point into a waving bending moment and a shimmy bending moment, and output the waving bending moment and the shimmy bending moment to a pitch-variable control system or a master control system of a wind generating set.

Description

technical field [0001] The invention relates to the field of wind power generation monitoring, in particular to a load measuring device applied to a blade load of a wind power generating set and a measuring method thereof. Background technique [0002] The cost of wind power generation is the main factor restricting the development of the wind power industry. In order to reduce the cost of kilowatt-hour power generation, the size of the designed wind turbine blades is getting larger and larger. The diameter of large wind turbine blades has reached more than 100 meters, and the weight of a single blade is several Ten tons, in the area swept by the blades, due to the influence of terrain and other factors, the wind speed is uneven, resulting in uneven wind loads on the blades, prone to excessive fatigue of the blades and vibration of the wind turbine, reducing power generation efficiency. Therefore, it is very important to know the load of wind blades in real time. Knowing the...

AI Technical Summary

Problems solved by technology

However, there are few load monitoring sensors suitable for wind power blades at present. The common resistive strain sensors are prone to failure in the harsh environment of wind power generation, such as lightning strikes, salt spray, and high temperature differences between day and night. At the same time, the wiring of such sensors is complicated. , not easy to measure in large-capacity networking

Images