The Research Of Direct-Drive Permanent Magnet Wind Turbine Generator System On MPPT Control Technology

With the increasingly serious problems of environmental pollution and energy shortage,the development of renewable energy power generation has become an inevitable trend.Wind energy,as a pollution-free,abundant and renewable energy,has become an important direction of renewable energy development in the world.At present,the direct drive permanent magnet synchronous wind turbine is the mainstream model of wind power generation system.It has been widely used because of its remarkable technical advantages.In this paper,the components of the direct-drive permanent magnet synchronous wind turbine are analyzed,and then the simulation model is built.The fuzzy PID control algorithm is adopted to realize the maximum power tracking control target.This paper first introduces the background and significance of this research,discusses the current situation of wind power generation technology at home and abroad,introduces the various components of direct drive permanent magnet wind turbine,analyzes the operation principle of wind turbine,The control target of the generator,is the target of the maximum power tracking control.A mathematical model of wind turbine,permanent magnet synchronous generator,machine side converter and grid side converter is established for the maximum power tracking control target.These mathematical models provide the theoretical basis for establishing the simulation model below.In this paper,the maximum power tracking control method of wind turbine is studied,and the control methods such as blade speed ratio control,power curve control and climbing search algorithm,variable step climbing algorithm,fuzzy control and fuzzy PID are introduced in detail.Finally,the fuzzy PID control method is chosen as the main control method.Based on the simulation model,the fuzzy control and fuzzy PID control method are designed to ensure the maximum power output of the direct drive permanent magnet wind power generation system based on the mathematical model of direct drive permanent magnet wind generator.By comparing the simulation results,it is proved that the fuzzy PID control algorithm has better control effect than the fuzzy control algorithm.