| This dissertation is a part of the project of Permanent-Magnet Generator based Wind Power Generation Energy Conversion System. The paper studied Predicted Current Control with Fixed Switching Frequency (PCFF) for Grid Side Converter of wind power generation system. This paper focuses on the researches of operation principle, mathematical model, model simulation and experiment validating.Firstly, the operating principle and mathematical model of Voltage Source PWM Rectifier (VSR) was analyzed in this paper. Also, this paper introduced several common control methods such as Vector Control (VC), Direct Power Control (DPC), Hysteretic Current-mode Control and compared their characteristics. This dissertation mainly analyzed the operating principle and control methods of PCFF, then analyzed the reason and compensating scheme of phase error produced by PCFF with mathematical method.Moreover, this dissertation introduced the conception of virtual flux on the basis of PCFF, then estimated virtual flux in terms of direct voltage, alternating current and switch states of PWM rectifier to calculate the phase of grid voltage and replace line voltage sensors.This dissertation built PCFF simulation model of Voltage Source PWM Rectifier by MATLAB/Simulink to simulate PCFF as well as validate and compensate the existent phase error. This paper also simulated its steady state characteristics and dynamic characteristics based on the simulation model and achieved power factor control of VSR. Furthermore, this paper imitated Non-line voltage sensors virtual flux based PCFF and validated its feasibility.In the end, the PCFF experiment platform of PWM rectifier was established. This dissertation composed program of control system and accomplished the experiments of PCFF. The experiments results indicate that PCFF has the advantages of controllable power factor, simple arithmetic and system structure, fixed switching frequency, better dynamic response, easy to digitization etc. |
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