Design And Realization Of Rectifier With High Power Factor Based On Vienna Topology

With the development of science and technology, we can see the existence of power electronic devices in the power system widely.But most of the rectifier can not reach the international standard of the Current harmonics content. The rectifier circuit which is composed of a nonlinear controllable device and uncontrollable diodes can lead to a very high input current harmonics and generate a large number of reactive power, resulting in the grid voltage distortion and pollution. It is imperative to study the PWM rectifier with high power factor and low current harmonics.Compared with the traditional three-phase-two-level rectifier,the VIENNA rectifier is not only has a wide range of applications, but also be able to achieve a higher power factor and achieve a smaller harmonic content of the input current.So in this paper, the design and implementation of VIENNA rectifier is studied.In this paper, the working principle, the switching states, the mathematical model and the SVPWM control method of the VIENNA rectifier topology are analyzed in detail. Then this paper analyzes the control principle of the voltage outer loop and the current inner loop. The PI controller’s parameters of the current loop and the voltage loop are designed. After the theoretical analysis, the parameters of the input power inductor and output capacitor are calculated. Finally, the VIENNA rectifier simulation system is built in MATLAB.the simulation results indicates that the input three-phase current can track on the three-phase input voltages. The simulation results are in agreement with the theoretical analysis.The results also can verify the correctness of the control algorithm of the system and the feasibility of the design parameters.According to the functional requirements of the VIENNA rectifier, this paper designs the hardware system structure and the function modules including the main circuit, drive circuit, control circuit, protection circuit and so on. There are two highlights in the design.first, this paper proposes a non-isolated sampling scheme of three-phase input voltage and the DC output voltage.The scheme can save costs and volume. Second, this paper presents a novel hardware output voltage self-balance scheme.The scheme can solve the problems of high voltage power supply of the system,such as the device selection, the transformer design,the production costs and so on. Finally, the two schemes are successfully applied to the experimental prototype.Finally, this paper builds an experimental platform of the VIENNA rectifier with DSP digital control. We verify the theoretical research and debug the experimental platform of the VIENNA rectifier. The experimental results show that the hardware design of the system is effective.The VIENNA rectifier system can achieve a power factor greater than 98%, and the THD of the input current is less than 5%...