Design and implementation of a 130KW, 750VDC bidirectional PWM rectifier supplied from 400V, 50HZ grid

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2019
Pul, Tevfik
Design of a 130kVA of all SiC MOSFET based voltage source three phase PWM rectifier was made in the scope of this thesis study. Power losses of SiC MOSFET and Si IGBT having same voltage and current ratings were analyzed. Selection criteria of all materials used in rectifier panel was explained in detail. Unity power factor operation, bidirectional power flow, pure sinusoidal line current, regulated and adjustable output voltage were achieved by applying Phase Lock Loop algorithm and Voltage Oriented Control. Control methods mostly used in three phase PWM rectifiers which are Voltage Oriented Control and Direct Power Control were compared. Frequently used Pulse Width Modulation methods which are Sinusoidal Pulse Width Modulation and Space Vector Pulse Width modulation were contrasted. Phase Lock Loop algorithm, Voltage Oriented Control and Space Vector Pulse Width Modulation were implemented both on MATLAB/Simulink simulation environment and on Digital Signal Processor. Designed all SiC MOSFET based voltage source three phase PWM rectifier was tested at 130kVA of input power by using three phase voltage source traction inverter in the laboratory test bench as an active load. Power quality measurements such as Total Harmonic Distortion of line to line voltages, Total Harmonic Distortion of line currents and power factor were also performed using power quality analyzer.