Study On Direct Power Control System Of Dual-PWM Converter Integration

At present,in the field of variable frequency adjustable speed, the generalconverters adopt a diode in rectifier part, adopt PWM in inverter part. The convertershas low power factor, harmonic pollution is serious, and can not realize energyrecycling. This paper adopts the PWM rectifier to replace the uncontrollable rectifierpart of traditional AC-DC-AC converter, To constitute the Dual-PWM converter. Dual-PWM converter network current is sine wave, the unit power factor, dynamic responseis quick, energy transmission bidirectional etc.The main content of this paper is research on the rectifier part of Dual-PWMconverter, and then carries on the integrated control of rectifier and inverter. Firstlyanalysis the working principle and mathematical model of three-phase voltage typePWM rectifier, Then analysis and compare on varieties direct power control of three-phase voltage type PWM rectifier, put forward direct power control of based on virtualflux without voltage sensor. And using two cascaded links to instead of the pure integral,solving integral initial value problem when observate virtual flux. Giving the controlsystem design of direct power control of three-phase voltage type PWM rectifier.In theSVPWM control algorithm,using Matlab/Simulink simulation environment tosimulation the control strategy,verified the design scheme is validity and feasibility.This paper is on basise of oretical analysis and simulation experiment, TakeTMS320LF2812DSP chip of TI company as core control, combined with the hardwareto designing flow and software implementation of PWM direct power control based onSVPWM technology.Drawing the part test results. The achievement of this paper is thefoundation further study on direct power control of three-phase voltage type PWMrectifier.