The Research On Converter's Control System Of The Direct-Driven Wind Power Generation System

Direct-driven wind generation system has spared the gear case and dirve the wind wheel directly by permanent magnet synchronous generator's roter,more and more countries has been thinking much of it due to its low noises and high efficiency. At present, China's direct-drive low-power wind turbine converter is made of, Subject to the constraints of converter technology, most of MW direct-driven wind generation system'power converters are still relied on importing.Hence,it has a great academic and actual significance for studying the control technology of direct-driven wind generation system's deflector.The article firstly introduce the full power converter's structure and control technology and established some math models through studying the operation characteristice of wind turbine and PMSQIncluding wind turbine model,permanent magnet synchronous generator model,shafting model,power converter model.Base on the math models,the control of rotor magnetic field to the converter at generator-side is researched,The purpose of follow the most wind energy is reached.for the grid-side,The directional voltage control is researched,The voltage at DC side fluctuate acutly because of the variety of wind speed, aim at the problem,Through the fuzzy PI control in the voltage outer loop and PI control in the current inner loop,the unity power factor retrorse convent is realized.Besides,the concerted control based on RBF neural network is resolved the problem of grid voltage sag on the basis of power balance,through transporting the Q power to the grid to made the Direct-driven wind generation connect to the grid.Through compare the characteristic of some different filters,the LCL filter is adoped to the grid-side power conventer.then the LCL filter's math model and characteristic are analysed,and the parameters of LCL filter are confilmed.In the end,the simulation models of the power conventer at generator side and grid side are bulited with matlab/sinmulink software, and the holistic model of direct-driven wind generation system is simulated, Through analyse the simulation results,the control strategies are proved to be correct and doable.