Design Of Single-Phase Voltage-Source PWM Rectifier Based On DSP

Development of social production and life makes the demand for electricity more and more urgent,at the same time,power quality requirements are also increasing.Power electronics technology has been developed to chase the need of times with its characteristic of efficiently using of energy,as well as the maintenance of power grid environment.As one of the technical means,the PWM rectifier system has been studied a lot and applied more widely.The study target of this paper is single-phase voltage-source PWM rectifier.Most of current researches on PWM rectifier are concentrated on three-phase system,while there is few cases with single-phase.Voltage-source is a more common topology.PWM control is the core part of a rectifier system,which requires the demand of a stable DC output voltage with smaller ripples,unity or adjustable power factor on AC side and lower input current harmonic contents.With the all above requirements,we not only adopt a common control method,PI dual closed-loop control,but also proportional-resonant(PR)dual closed-loop control and DQ coordinate transformation vector control.We first discuss these three kinds of control method,PWM modulation signal generation.Then we prove that we can achieve better AC side rectifier steady performance,lower waveform distortion using the PR dual closed-loop control and the DQ coordinate transformation vector control.In addition,the application of DQ coordinate transformation vector control also allows the dynamic performance of the system been significantly improved.And these three kinds of methods can achieve two-way flow of energy results.This study may provide theoretical and practical basis for PWM rectifier control program.Based on theory and simulation,we also carried out the design and implementation of the PWM rectification system based on DSP.The hardware work includes a main circuit,a core control circuit module,a sampling &conditioning circuit module,a driving circuit module.We build the software using three kinds of control methods.Experiment results from the rectification system demonstrate our research ideas.