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* Corresponding author: lukasz.cieplinski@put.poznan.pl
Simulation model of one-phase full bridge diode rectifier with
current modulator
Łukasz Ciepliński1, Michał Krystkowiak1, Michał Gwóźdź1
1Poznan University of Technology, Electrical Department, 60-965 Poznań Piotrowo 3a, Poland
Abstract. In the article, the simulation model of a one-phase full bridge diode rectifier with a current
modulator in the input circuit is described. The proposed solution is characterized by the consumption of a
sinusoidal current from a power grid, compatible in phase with the fundamental harmonic of voltage. The
power circuit, as well as controlling parts of the constructed simulation model were presented. Moreover,
selected results of the simulation model investigation are shown.
1 Introduction
The article presents the structure of the power circuit and
the control system of the developed full bridge diode
rectifier with the current modulator in the input. This
solution is characterized by the sinusoidal current
consumption, compatible in phase with the fundamental
harmonic of the supply voltage.
The idea of the operation of the presented system is
based on the modulation of the inverter input current.
The current modulator is a controlled power electronic
current source connected to the main circuit using a
wideband transformer. As a result of the use of the
modulator, it is possible to obtain a quasi-sinusoidal
supply current, compatible in phase with the
fundamental harmonic of the grid voltage [1, 2]. In
addition, this solution allows for the regulation of the
output voltage, even though the high-current part is
based on a full bridge rectifier.
2 Operating principle of the one-phase
full bridge diode rectifier with current
modulator
The applied current modulator, coupled with the input
circuit of the full bridge rectifier system through a
wideband transformer with a small stream of dissipation,
can work in three modes of operation, namely:
- lowering the output voltage,
- increasing the output voltage,
- unchanging the output voltage (in this case its value is
the same as for the classic circuits of full bridge
rectifiers).
Consequently, by means of the current generated by
the modulator (with the appropriate shape), it is possible
not only to improve the quality of the accidental current
drawn from the network, but also to control the power
flow in the system - depending on the current needs. The
modulator is based on a voltage inverter with an output
inductive low-pass filter operating in a closed loop
system, constituting a controlled power electronic source
[3, 4]. By means of a transformer, the modulator current
is added (with a "+" or "-" sign) to the input current of
the full bridge rectifier. In this way, it is possible to
shape the resultant current of the network. In addition, it
is also possible to regulate the power flow in the system
and thus also the voltage regulation at the receiver.
3 Structure of the one-phase full bridge
diode rectifier with current modulator
Fig. 1. Diagram of one-phase full bridge rectifier with current
modulator.
The system is based on the classic structure of the full
bridge diode rectifier, in which the current modulator is
additionally connected at the input circuit. Transformer
coupling of two circuits was used for this purpose. This
solution allows for the shaping of the current drawn from
the grid. The current modulator can be implemented on
the basis of the transistor bridge type H with an output
induction filter.
The task of the modulator controlled current source
(I) is to modulate the input current, so that it is as close
as possible to the sinusoidal waveform and compatible
with the fundamental harmonic of the grid voltage
(minimization of reactive power and deformation power)
in phase. This solution requires measuring the
instantaneous value of the current drawn from the
ITM Web of Conferences 28, 01013 (2019) https://doi.org/10.1051/itmconf/20192801013
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© The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution
License 4.0 (http://creativecommons.org/licenses/by/4.0/).
network and the voltage on the DC bus - in order to
enable, among others, synchronization of the generated
set signal with the network voltage and active power
flow regulation (by controlling the voltage value on the
DC bus).
The block diagram of the control system of current
modulator is presented in Fig. 2. A master PI output
voltage regulator on the DC bus was used. As a slave
regulator, the PI input current regulator was
implemented.
Fig. 2. Block diagram of the control system of one-phase full
bridge rectifier with current modulator.
4 Simulation model
Fig. 3 shows the simulation model of the high-current
part of the described system. The Matlab Simulink
software from The MathWorks, Inc. was used for this
purpose [5, 6]. Since the conducted research was only to
enable verification of the correctness of the system
concept operation, perfect elements were used, omitting
their parasitic parameters. The modulator was modeled
as a controlled power source.
Fig. 3. Simulation model of one-phase full bridge rectifier with
current modulator.
Fig. 4. Simulation model of the control system of one-phase
full bridge rectifier with current modulator.
Fig. 4 presents the structure of the control system.
Since the current modulator in the case under
consideration is based on an ideal controlled current
source, the PWM modulator has not been taken into
account.
5 Simulation research results
A summary of the obtained simulation research results is
presented in Fig. 5 and Fig. 6.
The use of a current modulator in the input circuit of
a one-phase full bridge rectifier allows not only to
improve the quality of the current drawn from the
network (THD is about 0.3 %), but also to regulate and
stabilize the output voltage on the DC bus to the desired
value.
Fig. 5. Comparison of current (iZ1) drawn by full bridge
rectifier and current (iZ2) drawn by full bridge rectifier with an
input current modulator, set voltage is 300 VDC.
Fig. 6. Comparison of voltage (uDC1) at the output of full bridge
rectifier and voltage (uDC2) at the output of full bridge rectifier
with an input current modulator, set voltage is 300 VDC.
6 Conclusions
The article presents the high-current and control part of
the one-phase full bridge rectifier with current modulator
at the input, which allows for the current consumption
with a shape similar to a sinusoid from the network. The
economic advantage of the presented solution is, among
others, the possibility of relatively easy implementation
in existing systems. As part of future works, it is planned
to refine the part of the high-current simulation model, as
well as optimization of structures and settings of the
voltage and current regulators used.
References
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252-255 (2004)
4. M. Gwóźdź, M. Krystkowiak, Prz.
Elektrotechniczny, 7, 138-140 (2009)
5. https://www.mathworks.com, Access: May, 2019
6. V.F. Pires, J.F.A. Silva, IEEE Transactions on
Education 45, 253-261 (2002)
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ITM Web of Conferences 28, 01013 (2019) https://doi.org/10.1051/itmconf/20192801013
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