Abstracto

Design of a 5KW Power Converter for powering thruster of a Remotely Operated Submersible

Harika Sadasivuni, Porselvi Thayumanavan, Subramanian AN

In this paper, the design of a deck based power converter for powering thruster of a remotely operated underwater vehicle is presented. The variable thruster is mechanically powered with a Brushless DC motor. The power converter has to maintain a constant voltage of 300 V DC irrespective of the maneuvering speed. The power converter consists of three main parts viz., Three phase diode rectifier to convert input AC to DC, Buck converter to step-down the DC according to the load requirement and a microcontroller for varying the duty ratio using PWM. An Insulated Gate Bipolar Transistor (IGBT) is used as a switch. The output voltage is maintained at 300 V DC by increasing or decreasing the duty ratio. Switching techniques employed is based on the measured buck output voltage and current for a given cable resistance which is adjusted from sensed correction to keep constant 300V DC output at the equipment. Index Terms—Power Converter, Remotely Operated Vehicle, 5 kW Regulated Power Supply.