Analysis of Hysteresis Current Controlled Three Phase PWM Rectifier with Reduced Switching Loss

Pulse Width Modulated (PWM) Rectifiers offer a promising and high end performance for the ac to dc conversion needs of the industry, customer and power grid sectors. This paper presents a reduced switching loss algorithm applied to a hysteresis current controlled PWM rectifier. This acts as an ac to dc boost converter with near unity power factor at the grid side along with regulated and ripple free dc voltage at the output. Adaptive hysteresis technique is incorporated in the hysteresis controller so that near constant frequency of operation is assured. The performance of the converter with reduced loss is compared with that of conventional hysteresis controller with and without adaptive technique. Matlab/Simulink simulation results show a better performance for the converter with modified switching algorithm in terms of switching loss, overall efficiency, dynamic and steady state performance.