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A novel three phase buck boost AC DC converter
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A novel three-phase buck-boost AC-DC converter

Category : Power Electronics


Sub Category : AC TO DC CONVERTERS (RECTIFIERS)


Project Code : ITPW07


Project Abstract

A simple, low-cost, reduced-switch, three-phase ac– dc buck–boost converter is proposed in this paper. The converter can operate with input power factor correction and is suitable for applications where a converter needs to operate over a wide range of input ac voltages and/or produce a wide range of output dc voltages. 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.

 

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

 
 
 
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