Design And Testing Of 3-Phase Converter Applicable To Four Quadrant Operation

It is needless to say that four quadrant principle plays a vital role in industrial applications .Running a machine both in motoring and generating action illustrates the four quadrant operation. In electric locomotives, the motor may run clock wise and anti clockwise, and the torque may act either with or against the direction of rotation. In other words the speed and torque may be positive or negative. An attempt is made in this paper to demonstrate this principle by designing the required converter. Here, converter performs dual function i.e. both as rectifier (AC to DC) and inverter (DC to AC) Though the carrier period is fixed, the ON/OFF pulse widths are changing continuously that’s why this type of switching is called Pulse Width Modulation,(PWM). This PWM technique has been adopted in this paper with six-number of Insulated Gate Bipolar Transistors (IGBT’s) corresponding driver circuit. So designed converter has been tested with CRO at different stages .The same has been counter conformed by simulation process using MAT LAB/ Simulink. The bi-directional operation of converter is successfully observed at respective stages by CRO which depicts four quadrant operations.