Simulation Research On Dual-pwm Converter Control Of Doubly-fed Induction Generator

The dual-PMW converter which used in the Doubly-Fed Induction Generator is consisted of two fully symmetrical PWM converters; these two converters are connected through a DC bus. The output of the generator-side converter, which is the input of the rotor, directly controls the running of the Doubly-Fed Induction Generator. The dual-PMW converter control is the core of the Doubly-Fed Induction Generator running control. In view of this, the paper attempt to do some simulation research of the control of dual-PMW converter, which is used in the Doubly-Fed Induction Generator.Firstly, the characteristics of the dual-PWM converter were analyzed in this paper, and the work principle of the dual-PMW converter was elaborated. Then the paper established the mathematical model from three-phase static coordinate system of the Doubly-Fed Induction Generator.According to the coordinate transformation theory, the paper further established the mathematical model of the Doubly-Fed Induction Generator from the two-phase static coordinate system and the two-phase rotating coordinate system. Based on the mathematical model, after the introduction of the principle of vector control, the paper identified the power grid voltage vector orientation as the method of the control of grid-converter, then established the control model of the grid-side converter, and designed the control diagram of the grid-side converter. Next, the paper established the mathematical model of the Doubly-Fed Induction Generator. Based on the mathematical model, stator flux vector orientation was identified as the control fashion of generator-side converter, then control model was established and control diagram was designed, too.Finally, in use of the MATLAB/LIMULINK simulation software, according to the control diagram, the paper established the simulation model of the dual-PMW converter. In the light of the simulation model, the paper did a series of simulation studies. The simulation results showed that the control targets of the grid-side converter and the generator-side converter wear achieved successfully.