Research And Design On DSP For Three-Phase Active Power Factor Correction System

It needs plentiful rectifying power supply in industrial field. And people has realized that the rectifying system with lower power factor can bring harmonic pollution and pollute the electric net since the modern power electronics technology has uninterrupted development. So, eliminating harmonic pollution and improving power factor has been the development tendency of the rectifying system. Due to the prodigious proportion of medium and big electronics equipment in power line, the research of high power factor three phase rectifiers is becoming the research hotpot on international and nativeWith the development of the digital technique, more and control algorithms can be implemented in power electronics by the digital chips: microprocessors or digital signal processors (DSP). The merits of digital control: simple hardware, no temperature drift, flexible control and easy to realize advanced arithmetic etc, make digital control technique to be used in power supply manufacture to let it more credible and easier to realize in batches with lower costs. In the current it is popular to use digital control in power design.First of all some kinds methods of three phase PFC are given out, A three phase Power Frequency Corrector system with three-phase three-switch three-level and two cycles control methods was given out based on the research of the front. Then the characteristic of DSP chips in application of power electronics equipment. This thesis presents the total project to design the summarizes the control method of the PFC and the characteristic of the PFC power supply based on DSP. In order to get good dynamic as well as static performance, multiple-loop control strategy with the instantaneous outer voltage loop and inner current loop is used in PFC converter based on DSP TMS320LF2407A. How to get the control parameters is analyzed in details and the experimental results are displayed.The last of paper the system was simulinked in Matlab to confirm the methods of control .The result of simulator is useful for circuit of system and control. It is hard to establish the mode of three-phase which is the non-line, because the mode is hard to be established and the complex circuit can not be sure to weaken. So the mode was established by simplify, and the result show the methods and design parameters is right.