Simulintion Study On Three-Phase Voltage Source SVPWM Rectifier

With the development of power electronics and computer science, Space Vector Pulse Width Modulation (called SVPWM for short) has caused extensive concern. The three-phase voltage source SVPWM rectifier has widely application fields. It has become a hot topic of'Green'rectifier because of the characteristics of high power factor, small harmonic pollution, constant direct voltage and bidirectional power flow.This thesis, from the point of generality and based on the background of rectifying device in the electromagnetic exploration field, centers on the three-phase voltage source SVPWM rectifier system analysis and design, and the construction of high speed simulation platform proposed discrete domain control model ect, as well as has completed the following work:Firstly, the thesis descried the basic principle of the three-phase voltage source SVPWM rectifier according to the topology structure of the main circuit.Two closed-loop control schemes combining the internal current loop and the external voltage loop has been introduced, the space voltage vector pulse width modulation has been further studied, as well as a simplified acting time judgment model of correlation vector algorithm by only one coordinate transformation has been proposed.Secondly, on the premise of further study of inductance and capacitance design, the thesis put forward an optimal value of inductance design method and minimum capacitance design method according to the most increased rate of active current and the most decreased rate of DC-side voltage when load was suddenly changed. The lag links such as rectifier delay, feedback channel filtering delay, signals acquisition delay were considered as PI regulators were designed, so the accuracy of its parameters was improved. And also, the voltage loop PI regulator design method using of optimum three order design was proposed.Thirdly, the advantages and disadvantages of various processors and self-characteristics of power electronics simulation were analyzed and compared. Aiming at the disadvantages of current research methods and the feasibility of the real-time power electronics simulation platform on FPGA, a novel way to construct high speed real-time simulation platform of the three-phase voltage source SVPWM rectifier was proposed based on the high speed signal processing ability of VHS-ADC. The general interface board was designed between VHS-ADC platform and main circuits and its correntness has been verified by experiments.Lastly, the thesis constructed many power electronics models in Z-domain such as PI, SVPWM, Park transform which has made the VHS-ADC software resource more perfect. Based on the top-down model design process, simulation research has been made to the three-phase voltage source SVPWM rectifier. Three simulation methods were used. The first one is that continuous control modeling and simulation based on traditional MARTLAB/Simulink. The second one is to construct discrete control modeling and download executable codes to board of simulation system, and then collaborative simulation in hardware was carried out. The third one is to construct experimental platform for three-phase voltage source SVPWM rectifier, and to realize the hardware in loop simulation according to combine on-line algorithm simulation by simulation system with power main circuit. The same results of three simulation methods have proved that the simulation of power electronic based on VHS-ADC platform has feasibility and the improved algorithms are correct. Therefore, based on VHS-ADC platform the hardware in loop simulation research method lays a foundation for the further high-power rectifier prototype development of electromagnetic exploration and has certain theoretical significance and application value for simulation of power electronic.