Proposal of a AC/DC converter with unitary power factor for a thermal plasma torch system

Abstract

This paper describes the project development and the construction of a 50 kW AC/DC PWM power supply with power factor correction for use with plasma inertization plant. The main power circuitry is built on a industrial IGBT's three-phase bridge rectifier module configured in a boost regulator topology and supplies by means of an electronic chopper, the 850 Vdc link. To attend the Brazilian electrical standard with regard to power factor and harmonic current injection in the electrical line, this power supply is provided of a power factor correction using a space-vector PWM. All the control was implemented in a TMS320LF2812A Evaluation Module (EVM). A remote PC microcomputer using a man-machine interface was connected to the DSP in order to supervise the parameters of the system.