The Design And Implement Of The Variable Pitch Controller For Mw Wind Turbine

Because of the increasing depletion of fossil oil resources and more attention about deterioration of the global environment, wind energy has been already under the whole world's attention as a kind of inexhaustible clean green energy by its outstanding advantages. The importance of wind energy's exploiture has beyond question, and wind power technologies have also been developed rapidly. But the large-scale wind energy exploiture must resolve a number of key technical issues firstly, in which the variable pitch control of wind turbine is a challenging control problem, a in-depth research on this has great practical significance.On this paper, the research is based on the project called "the design and manufacture technology of the megawatt-level direct-drive type wind turbine and key components", and proposed a design scheme of wind turbines variable pitch control system which takes a ARM embeded system as platform. At first, we get the theoretical basis of variable pitch control and analyses the variable pitch control basic law through the study of the basic theory of aerodynamics. We study and analyses the control systems and variable pitch control strategy of the direct-drive type megawatt-class wind turbine in detail, especially, the perspective has been extended from the conventional fan, the wind conditions to the local environment with fan, wind conditions, wind farm and other large wide-area grid environment when design the control strategy of variable pitch controller. We designed the structure of the main body and studied the reliability of variable pitch control system in particular. At the same time, we designed the hardware and software module to realize the basic functions of the variable pitch control system. By setting up the variable pitch wind turbine controller hardware and software test platform which based on ARM+Linux+PC, validated that the variable pitch control system on this paper can be realized. In our platform, we have achieved the basic function to control wind turbine blade pitch angle in real time, and about emergency shutdown in special cases, the initialization of the wind turbines in general, the variable pitch control when boot and when wind speed is lower than the rated wind speed, the variable pitch control in generation status, normal shutdown, etc, we get a satisfactory control result through simulation experiments.In this paper, we contrasted the domestic and foreign wind power technology research and application, proposed a wind turbines pitch controller design scheme based on ARM embeded system. We have done a in-depth study and comprehensive work at simulation, experiment, theory and practice, which lay a certain foundation for a farther research in future.