Research On Three-phase AC/DC Pfc Technology

Eliminating harmonic pollution from electronic equipments and improving power factor are the hot topic in the field of power electronics. In this thesis, the technology of three-phase AC/DC power-factor-correction technology is analyzed and it centers on performance analysis and design methods of three-phase voltage source PWM rectifier.Firstly, according to the topology of the main circuit, by switch-function,the math models in three-phase static reference frame,two-phase static reference frame and two-phase rotator reference frame were designed, the basic principle was discussed, and the relations between the system parameters with unity-power -factor were revealed.Secondly, the thesis discussed the current direct control and indirect control, and analyzed the control scheme based on three-phase static reference frame and two-phase rotator reference frame, and pointed out the better dymanic and static performance of the second; to decouple the three-phase system, the current feedforwad compensation was introduced, the current model decoupled was equal to one-order system and realized the separated control on the active and inactive current, as well as the design of PI regulator with the control theory. Then the design of anti-perturbation to the load and input voltage was done by introducing the feedforward control of them. The principle and synthesis method of space vector pulse width modulation were analyzed, and selected seven-segment synthesis method to reduce the harmonic.Three-phase VSR was modeled and simulated based on Saber, and the simulation results demonstrated the feasibility of control strategy and was helpful to the degsin of the main circuit and control circuit.At last, the main circuit parameters and the control circuit with its periphery circuit of the three-phase VSR were designed with the control of TMS320F2812. The T1 underflow interrupt subroutine was introduced into the achievement of control algorithm. The experimental results showed the feasibility of the design scheme of the system .