Dynamic Simulation Of Permanent Magnet Wind Turbine Generator Based On MATLAB

As the world's fastest growing renewable energy source,wind energy has drawn worldwide attention.With the increase of wind turbine,it is becoming more and more important to do research on dynamic response of PMSG.This paper is under the project background of "3.2MW PMSG system analyse",and it aims at studying dynamic response of PMSG and its system in normal and special operation mode.It analyzes the effect of converter system and control strategy on generator and gives advice for optimization design of PMSG.Firstly,this paper analyzes variable speed and variable pitch control strategy on the foundation of discussing basic theory of permanent magnet wind turbine generator.Then it builds simulation model of permanent magnet wind turbine generator based on Matlab/simulink and analyzes performance of generator under maximum power tracking and variable pitch control.Secondly,generator-side and grid-side converter of double PWM converter system and its control strategy has been discussed.Model of generator-side controller with double PI regulator based on speed outer-loop and current inner-loop control has been built.Model of grid-side controller based on grid voltage-oriented control with voltage outer-loop and current inner-loop has also been built by Matlab/simulink.Finally,simulation of dynamic response of PMSG during three phase short circuit and voltage dip of grid with different control,and three phase short circuit of generator terminal have been done.The result indicates:current change of grid converter and voltage change of direct current bus have an important influence on dynamic response of PMSG system. Dynamic response of PMSG system can be improved by maintaining inverter current and direct current bus voltage steady.Given generator design parameter satisfy the requirements of short circuit current.Impact of grid fault on generator can be reduced by using converter system.