A bidirectional single stage three phase rectifier with high-frequency isolation and power factor correction

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A Bidirectional Single-Stage Three Phase
Rectifier with High-Frequency Isolation
and Power Factor Correction
Introduction:
The use of equipment supplied by dc voltages rated within the
range of 380-400 V is currently found in industry, particularly in
telecommunications. Besides, the study of dc transmission system has
been intensified in the recent literature, mainly due to the widespread
use of small electrical grids and the intensive exploitation renewable
energy sources such as photovoltaic systems and wind energy
conversion systems (WECSs), which rely on dc voltages. With the
expansion of the distribution systems in recent decades and the
introduction of the smart grid concept, studies focused on topologies
with bidirectional capability to manage power flow between the
different energy sources (such as wind turbines, photovoltaic
modules, fuel cells, among others) and storage systems have been
increasingly carried out. Figure presents a typical distribution system
composed of high voltage lines and loads supplied by either ac or dc
medium and low voltages, while distinct primary sources also exist.
Existing system:
A bidirectional version of the topology introduced in without
output inductor filter, which is shown in Figure. The converter
increases power rating by paralleling phases, not by paralleling

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multiple devices, and it decreases turn ratio due to a double output
voltage by transformer open delta-wye connection. The possibility of
direct and indirect power flow is achieved with dual phase-shift
(DPS) Considering appropriate angles, it is possible to reduce the
reactive content and reduce transformer volume. The duty cycle of the
input bridge can be varied to regulate the input voltage and ensure
ZVS over the entire operation range.
Drawbacks:
 Low power density
 Complex circuit
 Less efficiency
Proposed system:
The proposed converter is shown in Figure, which is based on
the DAB converter, since the primary side is composed by a full-

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bridge converter employing the 3SSC. The use of the 3SSC allows
good distribution of losses among the semiconductors and also
reduction of high-frequency harmonic content for both voltages and
currents. In order to obtain reduced reactive power flow through the
transformer windings, the secondary is composed by a similar
arrangement using full bridge converters.
Advantages:
 Reduction of high-frequency harmonic content for both voltages
and currents.
 High power density.
 High efficiency.
Applications:
 Photovoltaic systems and wind energy conversion systems.

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 Smart-grids.
 Telecommunications (telecom) power supplies.
 More recent applications such as electric vehicles.
Block diagram:
AC Supply Isolation
Transformer
Three Phase
Rectifier
Load
Driver Circuit
Buffer circuit
Micro-controller
circuit
5V DC
Supply
12V DC Supply

A bidirectional single stage three phase rectifier with high-frequency isolation and power factor correction

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A bidirectional single stage three phase rectifier with high-frequency isolation and power factor correction