Three-phase current-type pulse width modulation (PWM) rectifiers are becomi
ng increasingly popular as the front-end converter unit in power electronic
systems due to tighter electromagnetic compatibility (EMC) regulations, In
this paper the control of the current source PWM rectifier in the synchron
ously rotating reference frame is discussed. A control system is presented
in which the active and reactive power are independently controlled with re
al and imaginary axis components of the supply current vector. A new dampin
g method for supply current oscillations is introduced. The method operates
in an open-loop manner and is very suitable for microcontroller implementa
tion since the calculation power demand is low Furthermore, it is shown tha
t in the synchronously rotating coordinates, where the sinusoidal variables
appear as dc quantities, the compensation of the reactive power drawn by t
he supply filter can be done very easily. The proposed control methods are
realized using a single-chip Motorola MC68HC916Y1 microcontroller, The expe
rimental tests show excellent performance in both steady state and transien
t conditions.