Research On PWM Rectifier Of High-voltage Frequency Converter Power Unit

With the development of power electronics and AC frequency control technology, frequency converter at the moment is more and more widely used in the social production and all aspects of life. In high power application, four-quadrant frequency converter which has fewer harmonic current in grid-side and by which the power can flow in two directions is widely used. Grid-side converter plays a key role in four-quadrant frequency converter. So the research on control strategy of grid-side converter is meaningful.Firstly the thesis first introduces the current situation of PWM rectifier control strategy. Through the analysis of our works, the mathematical model was derived. Meanwhile, we discussed the design of Space voltage vector of PWM rectifier control system under two-phase synchronous rotating reference frame. And the validity of this design was verified by simulation with Simulink.Then, the thesis gave a detailed description on the selection of three-phase voltage source PWM rectifier circuit's main parameters including AC-side inductance parameters and DC-side capacitance parameters, and the paper illustrates details of power switch device of choice, and designs control system software by using DSP chip TMS320F2812 described and particularizes its main program, initial subprogram and controlling subprogram at length.At last, through the experiment on GBP-H-06-125 High-voltage frequency converter power units in Jiaozuo HuaFei electronic electric appliance Co. LTD, I obtained ideal experimental results, and proved effectiveness and correctness of the design of hardware and software.