Three-phase Three-wire System Research Of Vienna Rectifier

With the development of power electronic technology, especially the rapid development of power semiconductor devices and control technology, power electronic devices are increasingly used in industry. Power electronic devices in improving production efficiency and product quality plays an important role,become a important basis for production automation equipment. Because of the power electronic equipment has a strong nonlinear characteristics of power electronic devices, power electronics devices inject a large amount of harmonic and reactive power in grid, causing severe grid "pollution". Therefore, how to improve the power factor of power electronic devices, and reduce the current total harmonic distortion rate become a problem which needs to be settled. VIENNA rectifier is a kind of typical three level topology in the topology of the three-phase rectifier. The topology with high power factor, less switching devices, low switch stress, has high research value and application prospect.This dissertation analyzes the VIENNA rectifier topology structure and working principle, through the state space average method to get its under three-phase ABC coordinate system and d-q coordinates mathematical model and equivalent circuit model. In this dissertation, the design method of the main circuit is studied, the key parameters of the system design is given.This dissertation analyzes the conventional three level turn two level SVPWM control strategy, and the control strategy are analyzed. On the control strategy of input current distortion occurred in sector transformation of problem, causing the decline of the power factor by the displacement, analysis the causes of the problem.Based on three level to two level SVPWM control strategy, this paper designs a control strategy which combine the seven stages and five stages of vector distribution SVPWM, and the control process of the control strategy are analyzed in detail. This dissertation builds the corresponding simulation model in MATLAB and the effectiveness of this chapter design is verified.This dissertation design the controller of VIENNA, and mathematical model based on d-q by current feed-forward decoupling control of current is achieved, thus established the double closed-loop control structure based on PI control. For more specific number of harmonic is contained in the input current, causing the decline of the power factor by the distortion, on the basis of the PI current loop. This dissertation designed the PIR controller which is made up by PI and PR controller to realize the current inner loop adjustment. This control method can not only realize the current tracking, also can realize the function of specific harmonicfilter. This dissertation through the MATLAB simulation proves the feasibility of this method.This dissertation based on the applications of this subject and function requirements, designed the software and hardware of the whole system. This dissertation built a platform with the core of 10 k W DSPF28069 VIENNA rectifier prototype debugging the rectifier prototype, the results of experiment are analyzed in the end to verify the feasibility of this design.