Peak demand reduction strategy for energy conversion in X-ray systems

Several commercial and industrial equipment, like automotive welders and medical exposition systems, take energy from the AC mains in a discontinuous way. Due to intermittent operation of these, a significant peak of energy has to be delivered from the mains in a short period of time. A PWM rectifier is used instead the typical three-phase diode or SCR rectifier to control the storage and deliver of energy during an operative cycle. In this paper an improved use of the energy for X-ray system is presented. Control based in Input-output linearization for dq current components is incorporated as control strategy. A decoupled, suitable for power control is obtained. Unitary Power Factor (PF) and low Total Harmonic Current Distortion (THDI) are guaranteed. Graphic simulation results are presented.