AC to DC PWM voltage source converter under hysteresis current control

In this paper, a new closed loop scheme, based on hysteresis current control for an AC to DC PWM voltage source converter is presented. In this control, for obtained reliable commutations, a lockout circuit is used. This circuit permits a switching frequency reduction and is suitable for IGBTs and thus for high power applications. The hysteresis control scheme presented in this paper can use a symmetrical or an asymmetrical hysteresis band. The implementation of an asymmetrical hysteresis band permits good control for output current. Also, the presented study refers to hysteresis control with a fixed band and a variable or sinusoidal band. A single-phase AC to DC PWM voltage source power converter under hysteresis current control has the merits of nearly sinusoidal input current, good power factor and regeneration ability. The study and the performance evaluation are made using PSPICE simulation. An improved model for system level simulation is used. This model is based on the switching signal for the power converter devices and is very important in real build-up of a power converter.