The Simulation of DFIG Grid Side Converter

Abstract

Firstly，DFIG basic structure of grid side converter was analyzed according to basic principles of voltage converter, and a mathematical model of grid side converter was established in the three-phase stationary coordinate system and the two-phase rotating coordinate system respectively. Then use the grid voltage oriented vector control strategy based On dq coordinate model of the grid side converter and its essential principles and realization scheme were introduced. Finally，SVPWM，Park，control systems and other power electronics model were built in matlab/simulink，converter was simulated based On vector control strategy under rectifier state and inverter state respectively. The simulation results show that the control strategy has a good dynamic response，and by choosing the appropriate inductance，capacitance，the network side current will reach stable state quickly with smooth waveform and small harmonic，while the DC voltage will reach stable value quickly with small overshoot.

Keywords

• grid side converter; vector control; control strategy; SVPWM