A wind turbine structural vibration monitoring instrument design
|School||Southwest Petroleum University|
|Course||Measuring Technology and Instruments|
|Keywords||Wind Turbine Structural Vibration Tri-axial Accelerometer IIR Filter ARM Corte-M3|
In natural conditions, such as rotor blades, driving mechanism and tower structure maybe generate vibration and deformation while air power, inertia force and the elastic force alternating load acting on the Wind Turbine. Wind power generation system operation process of the use of key structure structural vibration monitor real-time on-line monitoring of the low frequency, amplitude overrun or ultra-low frequency vibration have a warning and controlling equipment to send monitoring information. After receiving to alarm powered may frap the oars, emergency brake means such as wind Turbine, prevent structure protection failure.The paper first wind Turbine structure vibration monitoring research situation carried on the detailed analysis, and illustrates the wind Turbine structure vibration monitoring instrument, mainly including:the technical details of digital filter IIR based on Matlab design process, A/D conversion device selection analysis, circuit design methods and steps, circuit structure and function analysis, data acquisition programming, based on the ARM Cortex-M3 IIR digital filter of programming, CRC checking programming, the system of calibration and calibration process, etc.The wind Turbine structure vibration monitoring with double MCU design, the main logic control device based on ARM Cortex-M3, choose LM3S9B96 chip, the other internal integration 24 bits choose an A/D conversion module single-chip C8051F350 will acceleration sensor output analog signals are converted to digital signals, and migration calibration and gain calibration. Acceleration sensor selection MMA7260QT, measurable triaxial acceleration and output voltage signal proportional to the simulation. LM3S9B96 read the data at 100Hz rate, and vibration acceleration measurements in the ARM Cortex-M3 kernel IIR digital filter, in fengfeng value and RMS calculation. Monitor through a CAN bus, RS232C and parallel interface CAN read configuration parameters and send monitoring information, internal integration CANopen and Modbus agreement.The wind Turbine structure vibration monitoring measurement accuracy, stable performance, interface convenient, can replace the imported products use same type. Compared with the types of products imported after, this design localization price cheap, maintenance cost is low and maintenance cycle short wait for an advantage, but for wind power generation enterprise to reduce more than 50% of purchasing and maintenance cost, with a higher market value.