Research On New Control Strategies Of Three Phase PWM Rectifier With High Power Factor

With the increasingly serious problem of the power harmonic pollution as well as green and clean energy demand, scholars have paid more attention to the PWM rectifier control technology. PWM rectifier has many advantages such as the input sine current, run with unity power factor. In this equipment, energy can flow between DC-side and AC-side. Therefore, the study of PWM converter has become the hot topic of power electronic field.First, the working principle of three-phase voltage source PWM rectifier was systematically analyzed in the paper,and the mathematics model of PWM rectifier has been set up. Based on thar, the current mode control strategy of rectifier was discussed in details, and the typical control strategies with its research were introduced. The control strategies were given to demonstrate respectively from five aspects.There are: principle and application, controller parameters selecting, simulation waveforms comparing, advantages and disadvantages, suitable situation were.Secondly, the analysis of the rectifier based on mathematical models to analyze the rectifier current mode control strategies, several typical control strategies from their principle, the controller parameter selection, simulation waveform comparison, the respective advantages and disadvantages and the application of the five occasions to be compared side note; it was highlight that use of fixed-frequency and dual combination of fixed-frequency hysteresis hysteresis control new algorithm, described the basic idea of the control strategy and algorithm methods. Constant frequency hysteresis control strategy using a dual hysteresis control method, this control strategy targets for the rectifier AC side line current, rather than the phase current, the hysteretic switch state selected to reduce the high harmonics, Select the switch state of the current loop response speed, which can effectively track of the current control, while achieving nearly constant frequency.At last, on the base of theory research and simulation on fixed switching frequency control strategy, combining with evaluation board of DSP/TMS320LF2407 made in Sanyi Tec.CO.LTD, an experimental platform is established to support the theoretical activities of research in control algorithm. The experiments verify the feasibility and effectiveness of this method.