Type 1.5 Mw Doubly-fed Wind Variant Pitch Control Algorithm Research

The megawatt variable-speed variable-pitch wind turbine is today’s internationalmainstream turbine in the wind power field. In recent years,the megawatt-class windturbine which is our country independently developed has been put into operation.As the wind turbine is a complex, multi-variable, nonlinear, coupling systems, and thewind has randomness, instability, lower energy density and other characteristics, theresearch of control technology has become the key to solve the problem of wind turbineoperating safely and efficiently.The FD77turbine is1.5MW double-fed wind turbine which is manufactured byDEC who is a large domestic wind power manufacturing business. When the windturbine operating it uses the PID control algorithm introduced from abroad, this leadthat when the problems occur it can not be resolved quickly and effectively. Thus todesign a intelligent pitch control algorithm of highly efficient,easy to debug has becomean urgent demand for the wind farm operator.This paper focuses on the research and design of intelligent pitch controlalgorithm at the high wind speed. First, the basic theory of wind turbine running isdescribed,operating characteristics and each module of the wind turbine are analysed.Secondly, the intelligent pitch controller of the megawatt-class wind turbine at highwind speed is researched,the rules of the intelligent pitch controller is established.Thestructure of the controller has been improved because of the adjustment factor. Inaddition,the torque controller is designed to tracke the optimal wind energy curve at lowwind speed.Finally,the controller code is written in C language. I simulate and test thecontrol algorithm by simulation software Bladed, verify the rationality of the controlrules. The variables in the turbine running are analysed and evaluated. The test provedthat the system is able to maintain the rated power output at high wind speed, and at thelow wind speed it can track the wind power curve effectively. Compared with thetraditional PID controller, the intelligent pitch controller designed in this paper achievethe system’s control requirement and improved it’s stability.