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

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.