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Transcript
DOUBLE INPUT Z-SOURCE DC-DC
CONVERTER
Presented by
ABSTRACT
In this project presents a dynamic voltage restorer (DVR) that is
characterized by the use of a high-frequency unidirectional isolated
dc–dc converter is proposed. A traditional DVR has a large and bulky
series transformer even for three-phase low-voltage up to 480-V
applications because the transformer operates at the line frequency.
This project discusses the control and performance of a low-voltage
DVR using a high-frequency isolated dc–dc converter. The highfrequency transformer in the dc–dc converter is much smaller.
Experimental results obtained from the prototype confirm the viability
and effectiveness of the system configuration.
BLOCK DIAGRAM
AC SUPPLY
RECTIFIER AND
FILTER
12V DC SUPPLY
5V DC SUPPLY
Z SOURCE INVERTER
DRIVER
CIRCUIT
TMS PROCESSOR
LOAD
BLOCK DIAGRAM EXPLANATIONS
 Input supply:-DC
 Bridge rectifier:-It is used to convert AC voltage into Dcvoltage.
 Driver circuit:- It has two functions,
a) Amplification
b)Isolation.
It can be used to amplify the 5V pulses to 12V for using transistor
technology and provided isolations for using optocoupler.
 Dual Z source inverter:It is used to convert dc voltage into ac voltage.
 Load:- AC load
Rectifiers
 Here in our project for full wave rectification we use bridge rectifier.
From the basic bridge configuration we see that two diodes(say D2 &
D3) are conducting while the other two diodes (D1 & D4) are in off state
during the period t = 0 to T/2.Accordingly for the negative cycle of the
input the conducting diodes are D1 & D4 .Thus the polarity across the
load is the same.
Filters
 In order to obtain a dc voltage of 0 Hz, we have to use a low pass filter.
So that a capacitive filter circuit is used where a capacitor is connected
at the rectifier output& a dc is obtained across it. The filtered waveform
is essentially a dc voltage with negligible ripples & it is ultimately fed to
the load.
Power Supply Circuit
2
2
V1
D6
1
1
D5
TX1
C1
2
2
V3
D8
1
1
D7
Inverters
 DC to AC converters are known as inverters. The function of an inverter is
to change a dc input voltage to a symmetrical ac output voltage of desired
magnitude and frequency. The output voltage could be fixed or variable at
a fixed or variable frequency. A variable output voltage can be obtained by
varying the input dc voltage and maintaining the gain of the inverter
constant.
CIRCUIT DIAGRAM
EQUIVALENT CIRCUIT
CIRCUIT EXPLANATION
State 1, both source 1 and source 2 are active shows equivalent circuit of this
state. When both source1 and source 2 are active, the converter input dc voltage
is sum of voltage of two series dc sources. In this state, because both two
sources are active, D1 and D2 are forward biased and D3 and D4 are reverse
biased. Thus the sources current enters in Z-network through D1 and D2 and
after passing load impedance, comes back into sources through negative
polarity.
State 2, source 1 is active and source 2 is inactive In this state, source 1 is active,
so only this source provides converter (consequently load) energy. Because of
source 1 is active then D1 is forward biased and D3 is reverse biased, so Current
follows from D1 to Z-network to load.
State 3, source 1 is inactive and source 2 is active If source 1 is eliminated for each
reason and source 2 is active, the converter can operate normally without effect of
source 1 elimination.In state 3, it’s only source 2 that supplies converter and load.
Source 2 activation causes forward bias of D2 and reverse bias of D4. Because of
source 1 disconnection, current passes through D3 and indeed, current turns it on
forcedly to complete current path. In this state, converter input dc voltage is only
provided by source 2.
State 4, both source 1 and source 2 are inactive Basically, this state is only following
of one of the previously mentioned three states. Because in this state both dc
sources are inactive and disconnected from converter, D1 and D2 are forcedly
turned off and consequently, the only existing path for remain current, from
previous state, is provided by D3 and D4. Thereupon, in state4 D3 and D4 are
turned on.
Starting
Simulink
 Start Matlab
 Write in Command Window
 simulink




New… Model
Drag and Drop components from the libraries to the Model
Double click on component to edit parameters
Wire components together
 right button down and drag wire
 activate output, hold CTRL and click on input
ADVANTAGES
 Improved efficiency
 Low switching losses
 Low voltage stress
APPLICATION
 Industrial appliance
 improve the reliability.
 Boosting feature of converter makes it proper for new energy
applications.
CONCLUSION
In this project double input Z-source dc-dc converter is proposed.
The operation principle, including the operation modes and steadystate analysis is explained in detail. The analysis and simulation
results show the input dc sources can deliver power to the load
individually or simultaneously, as failure of each input sources
doesn’t disturb the other’s operation.
Two input sources can have different characteristics and voltage.
Also, converter controls output power with only one active switch
which can reduce cost and improve the reliability. Boosting feature
of converter makes it proper for new energy applications
REFERENCES:
 E. Milady and H. E. McKenna, “Power quality issues in a hybrid power
system,” IEEE Trans. Ind. Appl., vol. 38, no. 3, pp. 803-809, May/Jun
2002.
 F. Giraud and Z. M. Salameh, “Steady-state performance of a
gridconnected rooftop hybrid wind-photovoltaic power system with
battery storage,” IEEE Trans. Energy Convers., vol. 16, no. 1, pp. 1-7, Mar
2001.
 Yaow-Ming Chen, Yuan-Chuan Liu, and Sheng- sien Lin, “DoubleInput
PWM DC-DC Converter for High-/Low-Voltage Sources,” IEEE Trans.
Ind. Electron., vol. 53, no. 5, October 2006.
 Yuan-Chuan Liu and Yaow-Ming Chen, “A systematic approach to
synthesizing multi-input dc–dc converters” IEEE Trans. Power
Electron., vol. 24, no. 1, January 2009.
Thank You