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EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING CONCEPT:

         In a recent years greater need to limit these harmonics to meet regulatory standards.

         This can be done by some form of PFC to shape the input phase currents so that they are sinusoidal and in phase with the phase voltages.

PROPOSED CONCEPT:

         The main difference between the new converter and the conventional converter is that each of the switches in the converter under test sees a line-to-neutral voltage across it rather than a line-to-line voltage

EXISTING TECHNIQUE:

         Three-phase ac–dc single-switch buck–boost converter

PROPOSED TECHNIQUE:

          Three-phase reduced switch buck–boost converter

TECHNIQUE DEFINITION:

         Existed system converter is the three-phase ac–dc single-switch buck–boost converter.

         The converter is operated with a constant duty cycle throughout the line cycle and is designed so that its input capacitors operate in the discontinuous voltage which results in naturally sinusoidal input currents

TECHNIQUE DEFINITION:

          A new three-phase reduced switch buck–boost converter is described.

          The project will examine how a reduced switched converter with capacitive input filter operates in the boost mode and how a reduced switch converter operates in buck and boost modes.

DRAWBACKS

        Peak voltage stress is presented

       High cost

         Complicated control

ADVANTAGES 

           Lower rated devices can be used for a larger operational range.         Low voltage stress