Research On Modeling And Simulation Of AC Excitation Double Fed Generator System

The modeling and simulation of AC excited wind power generation system is the topic of this dissertation. This dissertation analyzes DFIG operation theory, including mathematic model of DFIG,coordinate transformation,DFIG operation characterrist–ics,DFIG power relationship .Deduce the relationship between rotor voltage and DF -IG speed or power factor.It analyse the vector diagram of DFIG four running state base on stator flux oriented vector control ,which is supersynchronous speed driven, supersynchronous speed generating, under synchronous speed driven, under synchr -onous speed generating.It briefly introduce basic principles of PWM rectifier, considering the DFIG system requirements,the author laid special stress on analyzing on the selecting of DC electric capacity. Simulation result verify that DC voltage has good stable quality. Base on analysis the fundamental principle of stator flux oriented ,control strategy of the cutting-in with no-load was put forward.. The simulation result demonstrate impact current is very small.Introduce the wind turbine mechanical features and build the simulation model of wind turbine,analysis the strategy of P,Q decoupled control base on stator flux oriented vector control. The simulation result demonstrate the control strategy is ideal.