Design and implementation of a pulse width modulated rectifier for industrial applications

Pulse Width Modulated (PWM) rectifiers have lower input current harmonics and faster voltage regulation speeds compared to classical diode and thyristor rectifiers. They also have adjustable input power factors and allow bi-directional power transfer. As a result their use has been widening especially in the front ends of motor derives and uninterrupted power supplies (UPS). A PWM rectifier that could be used in the front end of an industrial type UPS is investigated in this thesis. First, properties of PWM rectifiers and modulation techniques that are used in these converters are summarized, and mathematical models of PWM rectifiers are given. Contoller design and simulation work have been performed based on these models. Finally, power stage and filter design of a boost type PWM rectifier that has 220 V DC bus voltage and 70 A output current capacity is given. Experimental results are obtained by using a PWM rectifier that was built by an industrial company.