Research On Electric Pitch Control Of Large Scale Wind Turbine

Energy for human existence and social economic development, since twenty-firstCentury, the world changed pattern, economy, ecological environment, the earth energyeconomy high speed development bad, plus oil energy is drying up day by day, the windpower as the emerging clean energy has attracted worldwide attention.Modern wind turbinecontrol and excellent performance can be divided into three types: to maintain the theoutput power quality generator can. Wind turbine pitch propeller system technology fromthe initial distance stall control to variable pitch control, is a very important part of modernwind turbines.Firstly, this paper analyzes the basic structure of MW wind turbine, and then from theaerodynamics of wind turbine energy conversion process. Then from the wind absorption ofutilization coefficient, tip speed ratio and torque coefficient, analysis of the overallrequirements of wind turbine on the pitch control system, laid the foundation for therealization of the design of the pitch controller and hardware and software.Then, the paper changed into the design from the controller of the propeller of a fuzzyself-tuning table and query and so on completion of the variable pitch design of a fuzzy self-tuning PID controller of wind turbine Analysis of wind turbine output torque and generatorpower output, the controller can meet the requirements of high reliability and stability ofwind turbine pitch control system.Then, the design and optimization of the electrical structure of pitch system of windturbine electric variable in this paper. First in the motor and servo control strategy, the servoactuator system was designed; and then optimizes the structure of electricity system, mainlyin the central control cabinet as a system of power distribution unit, the CANopen protocolfor data communication, as well as the backup power supply of super capacitor form.Finally, in the wind power turbine propeller system based hardware platform, the firstpitch master Bechhoff Twincat PLC configuration and debugging, then according to theactual operating mode simulation of wind turbine main control computer fan, assembledactuator pitch servo.In addition to write the host human-computer interface, convenient formonitoring and debugging. Its reliability has been verified in this paper the stability of thesystem with experimental results.