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Design of Three Phase PLL and Research on Control of DFIG Grid Convertor

Author: QinWei
Tutor: ZhuangShengXian
School: Southwest Jiaotong University
Course: Microelectronics and Solid State Electronics
Keywords: Three-phase VSR SVPWM Dual closed-loop control system Three-phase phase-locked loop CORDIC
CLC: TM461
Type: Master's thesis
Year: 2010
Downloads: 454
Quote: 3
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Abstract


With the development of power electronics technology, microelectronic technology and control theory, the power conversion device based on PWM (Pulse Width Modulation) technology has been widely used in the double-fed induction generator (DFIG) system. PWM rectifier with high power factor, energy can flow in both directions, and a constant DC voltage. For PWM rectifier and network requirements, the lock-in technique of three-phase grid voltage gradually become a hot research at home and abroad. PWM rectifiers and grid-lock-in technique, in-depth study of a very important practical significance. This paper applications from the the DFIG network side converter three-phase Voltage PWM Rectifier (Voltage Source PWM Rectifier, VSR) of the main circuit, and expounds the basic principle of the PWM rectifier. Were established through the analysis of the main circuit of the three-phase VSR VSR mathematical model based on the three-phase three-phase stationary coordinate two-phase rotating coordinate the DC voltage of the main circuit, the AC side inductance and capacitance of the DC side design. In a comprehensive analysis of the PWM rectifier control methods and control strategies, based on a mathematical model of the two-phase rotating coordinate the three-phase VSR to complete the design of the control system. In the MATLAB / SMULINK simulation tools established three-phase circuit model and control system of the VSR model and the simulation. The simulation results demonstrate the feasibility of the system design to achieve a unity power factor PWM rectifier run, two-way flow of energy, the DC voltage is constant at 250V. The same time, for PWM rectifier grid phase-locked, the three-phase phase-locked loop. First elaborated the basic principles of the three-phase phase-locked loop, and the three-phase grid voltage distortion may occur, including the three-phase imbalance, there is the case of harmonic theory analysis. Three-phase phase-locked loop modeling, system analysis, design typical type I system, the three-phase phase-locked loop. Different grid case simulation under different parameters measure three-phase phase-locked loop and analyzes the parameters that affect the performance of the three-phase phase-locked loop, and the systematic three-phase PLL can do the analysis, design optimization. FPGA-based designs containing multiple multiplication and trigonometric functions for three-phase phase-locked loop characteristics optimized three-phase phase-locked loop, a complete entire circumference coordinate rotation coordinate rotation digital computer ( CORDIC) algorithm is a viable program. Optimized three-phase PLL using Verilog HDL hardware description language coding. Through simulation to verify the feasibility of the three-phase phase-locked loop based on FPGA design.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter > Rectifier
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