Research On Variable Pitch Wind Power Generation System With Unfalsified Control

With the depletion of fossil energy and the environmental problems caused by the extensive use of fossil fuels,human beings are actively seeking renewable energy sources to change the energy structure and achieve sustainable development.Because of its advantages such as cycle,pollution free and low cost,wind energy has been paid more attention all over the world.Efficient utilization of wind energy and improvement of power generation quality are the main research directions and key points of wind power generation related technologies.Due to the uneven distribution,randomness and instability of wind energy,it is necessary for wind power generation system to realize unattended operation.Therefore,the research on the control system of wind turbine has profound practical significance.In this paper,the constant power control of wind power generation system is taken as the goal,and the pitch control technology and its realization method are deeply explored.The main work is as follows:First of all,the research background and significance of the subject are expounded.The status and development trend of control technology for variable pitch wind power system generation system in recent years are analyzed.The key and design idea of control technology for variable pitch wind power generation system is obtained.Secondly,aiming at the difficulty of model-based control of variable-pitch wind power generation system,the parameter-adaptive tuning of PID controller is designed based on the data-driven unfalsified control by analyzing the modelless control problem.After that,aiming at the problem that the controller set of traditional unfalsified control can not be infinitely,the improved gradient unfalsified control algorithm based on conjugate gradient method is designed by analyzing the gradient unfalsified control algorithm.Based on the Simscape platform,a wind power generation system is designed to obtain system data and visualize the operation.Taking account of both the wind speed and direction,the pitch controller is designed based on the improved algorithm and the yaw controller is designed based on the PID control.Finally,the author summarizes the existing work and points out the direction to be further studied.