A vector controlled current-source PWM rectifier with a novelcurrent damping method

摘要

Three-phase current-type pulse width modulation (PWM) rectifiersnare becoming increasingly popular as the front-end converter unit innpower electronic systems due to tighter electromagnetic compatibilityn(EMC) regulations. In this paper the control of the current source PWMnrectifier in the synchronously rotating reference frame is discussed. Ancontrol system is presented in which the active and reactive power arenindependently controlled with real and imaginary axis components of thensupply current vector. A new damping method for supply currentnoscillations is introduced. The method operates in an open-loop mannernand is very suitable for microcontroller implementation since thencalculation power demand is low. Furthermore, it is shown that in thensynchronously rotating coordinates, where the sinusoidal variablesnappear as DC quantities, the compensation of the reactive power drawn bynthe supply filter can be done very easily. The proposed control methodsnare realized using a single-chip Motorola MC68HC916Y1 microcontroller.nThe experimental tests show excellent performance in both steady statenand transient conditions