Modeling And Studying For Control Strategies On The Wind Turbine System With The Directly Drive Permanent Magnet Synchronous Generator Based On Back-to-back PWM Conwerter

At present, with the increasing of wind turbine gengerator's capacity and the enlarging of wind power factory, the technique of electricity generation using wind turbines just face on larger power capacity,higher efficiency,directly driven,variable speed,variable pitch and optimum control. This paper based on back-to-back PWM convertor, researchs the higher efficiency,much more reliable of directly driven wind turbine with permanent magnet synchronous generators systems.Firstly,the paper base on the technique of variable speed constant frequency, discuss the directly driven of wind turbine with permanent magnet synchronous generators(D-PMSG) wind turbine systems, include the feature of variable speed constant frequency,the principle of D-PMSG wind turbine systems ,the topological structure of D-PMSG wind turbine systems converter and discuss the new techniques of D-PMSG wind turbine system converter,base on the topological structure of back-to-back PWM convertor,builts the core of this paper;Secondly,reposes on the principle of D-PMSG wind turbine systems,built the mathematical model of D-PMSG wind turbine systems, includes the model of wind turbine,the mathematical model of shaft-line,the model of D-PMSG and the mathematical model of back-to-back PWM convertor ;Thirdly,aims at the back-to-back PWM convertor of D-PMSG wind turine systems and reposes on the technique of vector control, presents respective control strategy,the control strategy of back-to-back PWM convertor includes the control strategy of generator's convertor and grid's convertor ; Finally , utilize DIgSILENT/PowerFactory simulates and verify the validity of model and the effectivity of back-to-back PWM convertor's control strategy during the grid occur the best voltage decline of three-phase short circuit fault and the modal of single phase short-circuit fault.