A nonisolated three port dc–dc converter and three-domain control method for pv-battery power systems

OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD
CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com
ECWAY TECHNOLOGIES
IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT
A NON ISOLATED THREE-PORT DC–DC CONVERTER AND THREE-DOMAIN
CONTROL METHOD FOR PV-BATTERY POWER SYSTEMS
By
A
PROJECT REPORT
Submitted to the Department of electronics & communication Engineering in the
FACULTY OF ENGINEERING & TECHNOLOGY
In partial fulfillment of the requirements for the award of the degree
Of
MASTER OF TECHNOLOGY
IN
ELECTRONICS & COMMUNICATION ENGINEERING
APRIL 2016

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
CERTIFICATE
Certified that this project report titled “A NON ISOLATED THREE-PORT DC–DC
CONVERTER AND THREE-DOMAIN CONTROL METHOD FOR PV-BATTERY
POWER SYSTEMS” is the bonafide work of Mr. _____________Who carried out the research
under my supervision Certified further, that to the best of my knowledge the work reported
herein does not form part of any other project report or dissertation on the basis of which a
degree or award was conferred on an earlier occasion on this or any other candidate.
Signature of the Guide Signature of the H.O.D
Name Name

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
DECLARATION
I hereby declare that the project work entitled “A NON ISOLATED THREE-PORT DC–DC
POWER SYSTEMS” Submitted to BHARATHIDASAN UNIVERSITY in partial fulfillment
of the requirement for the award of the Degree of MASTER OF APPLIED ELECTRONICS is a
record of original work done by me the guidance of Prof.A.Vinayagam M.Sc., M.Phil., M.E.,
to the best of my knowledge, the work reported here is not a part of any other thesis or work on
the basis of which a degree or award was conferred on an earlier occasion to me or any other
candidate.
(Student Name)
(Reg.No)
Place:
Date:

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
ACKNOWLEDGEMENT
I am extremely glad to present my project “A NON ISOLATED THREE-PORT DC–DC
POWER SYSTEMS” which is a part of my curriculum of third semester Master of Science in
Computer science. I take this opportunity to express my sincere gratitude to those who helped me
in bringing out this project work.
I would like to express my Director, Dr. K. ANANDAN, M.A.(Eco.), M.Ed., M.Phil.,(Edn.),
PGDCA., CGT., M.A.(Psy.) of who had given me an opportunity to undertake this project.
I am highly indebted to Co-Ordinator Prof. Muniappan Department of Physics and thank from
my deep heart for her valuable comments I received through my project.
I wish to express my deep sense of gratitude to my guide
Prof. A.Vinayagam M.Sc., M.Phil., M.E., for her immense help and encouragement for
successful completion of this project.
I also express my sincere thanks to the all the staff members of Computer science for their kind
advice.
And last, but not the least, I express my deep gratitude to my parents and friends for their
encouragement and support throughout the project.

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
ABSTRACT:
A new nonisolated multiinput multioutput dc–dc boost converter is proposed in this
paper. This converter is applicable in hybridizing alternative energy sources in electric vehicles.
In fact, by hybridization of energy sources, advantages of different sources are achievable. In this
converter, the loads power can be flexibly distributed between input sources. Also, charging or
discharging of energy storages by other input sources can be controlled properly. The proposed
converter has several outputs with different voltage levels which makes it suitable for interfacing
to multilevel inverters. Using of a multilevel inverter leads to reduction of voltage harmonics
which, consequently, reduces torque ripple of electric motor in electric vehicles. Also, electric
vehicles which using dc motor have at least two different dc voltage levels, one for ventilation
system and cabin lightening and other for supplying electric motor. The proposed converter has
just one inductor. Depending on charging and discharging states of the energy storage system
(ESS), two different power operation modes are defined for the converter. In order to design the
converter control system, small-signal model for each operation mode is extracted. The validity
of the proposed converter and its control performance are verified by simulation and
experimental results for different operation conditions.

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
INTRODUCTION:
Except for direct energy transfer power systems, a pulse-width modulation switching
dc/dc converter controlled by the maximum power point tracking (MPPT) algorithm has been
used to extract the maximum power of photovoltaic (PV) in PV-battery power systems.
Recently, three-port converters, interfacing one PV port, one bidirectional battery port,
and one load port of a PV-battery dc power system, are a good candidate for such a renewable
power system, particularly for a spacecraft power supply system.
Because of the high power density and high efficiency merit of the three-port converters,
it has increasingly attracted research interest toward various applications
In general rules were carried out to derive nonisolated and isolated multiple-input
converters from the single-input versions, which are adopted to identify the feasible input cell
that complies with some assumptions and conditions. the simple and costeffective approach
based on a buck or a buck–boost topology was proposed.
However, these converters have no power flow path for charging when a battery is
connected, which are not fit for a PV-battery dc power system. The converter proposed in can
interface two unidirectional input power ports and a bidirectional port for a storage element.
Only two power inductors have been utilized; however, the number of metal–oxide–
semiconductor field-effect transistor (MOSFET) and power diode reaches eight.

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
A systematic approach is given in to generate nonisolated three-port converters; these
converters feature high integration and high efficiency due to one-stage conversion. However,
the inherent right-half-plane zero (RHPZ) of traditional boost deteriorates both the dynamic
performance and ac characteristic of the converter, and the current of the port is discontinuous.
In a multiple-port dc/dc converter for regulated satellite power bus has been proposed.
The converter has high power density by sharing common power devices and merits a good
modularity property by using conductance current control.
However, the battery port voltage of the converter must be higher than the bus voltage,
which will make the battery design difficult and unsafe. Moreover, it is a two-stage power
conversion from PV to bus, deteriorating the whole converter efficiency.
Furthermore, in order to make the PV voltage close to the battery voltage for higher
efficiency, the PV voltage design will be difficult, since the voltage of the battery will be
changed when charging and discharging. In, a threeport converter with high-voltage gain has
been proposed, and the port current of the converter in the low-voltage side can be continuous.
However, semiconductor power devices reach seven, which will complicate the whole system
design.

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
EXISTING SYSTEM:
The dc–dc full-bridge converter uses resonant techniques in which resonant elements
such as capacitors and inductors are used to shape the current through a converter switch so that
it can fall to zero to allow the switch to turn off with ZCS.
The resonant elements, however, are large and bulky, which makes their use impractical
for many applications, and the converter is operated with variable frequency control, which
makes the design of the converter more difficult and also increases the size of the converter as it
must operate with low switching frequencies at lighter loads

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
PROPOSED SYSTEM:
VSA, VBAT, and VBUS denote the voltage of the PV port, the battery port, and the load
port, respectively. L1, L2, and L3 refer to the dc inductor. CIN, CBAT, and CBUS are the filter
capacitors paralleled with the corresponding port. The duty cycles of Q1 to Q3 are represented
by d1 to d3, respectively, where d2 and d3 are complementary. The proposed B3C merits high
power density by sharing some common power devices, high efficiency by making one stage
power conversion from PV or battery or load, high dynamic performance by employing the two-
inductor boost topology, and modular and recurrent property by controlling both battery and load
port. In addition, battery voltage can be lower than that of main bus for safety purposes.

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
ADVANTAGES:
 Improving the whole topology EMC property and making B3C able to extract maximum
power from PV.
 The efficiency of the converter is greatly improved.
 Leading to high power density.
 Reduced costs.
 Based on the three-domain main bus control method, the bus voltage is always regulated
with high quality in all power flow conditions

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
BLOCK DIAGRAM:

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
TOOLS AND SOFTWARE USED:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
APPLICATIONS:
 PV-battery power systems.

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
CONCLUSION:
A new multiinput multioutput dc–dc boost converter with unified structure for
hybridizing of power sources in electric vehicles is proposed in this paper. The proposed
converter has just one inductor. The proposed converter can be used for transferring energy
between different energy resources such as FC, PV, and ESSs like battery and SC. In this paper,
FC and battery are considered as power source and ESS, respectively. Also, the converter can be
utilized as single input multioutput converter. It is possible to have several outputs with different
voltage levels. The converter has two main operation modes which in battery discharging mode
both of input sources deliver power to output and in battery charging mode one of the input
sources not only supplies loads but also delivers power to the other source (battery). For each
modes, transfer functions matrices are obtained separately and compensators for closed loop
control of the converter is designed. It is seen that under various conditions such as rapid rise of
the loads power and suddenly change of the battery reference current, output voltages and battery
current are regulated to desired values. Outputs with different dc voltage levels are appropriate
for connection to multilevel inverters. In electric vehicles, using of multilevel inverters leads to
torque ripple reduction of induction motors. Also, electric vehicles which use dc motors have at
least two different dc voltage levels, one for ventilation system and cabin lightening and other for
supplying electric motor. Moreover, in grid connection of renewable energy resources like PV,
using of multilevel inverters is useful. Finally, operation of this converter was experimentally
verified using low-power range prototype.
.

CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111
ECWAY TECHNOLOGIES
REFERENCES:
[1] X. Zhang and C. Mi, Vehicle Power Management, New York, NY, USA: Springer, 2011.
[2] M. Ehsani, Y. Gao, and A. Emadi, Modern Electric, Hybrid Electric and Fuel Cell Vehicle
Fundamentals, Theory and Design, 2nd ed., New York, NY, USA: CRC Press, 2010.
[3] P. Thounthong, V. Chunkag, P. Sethakul, B. Davat, and M. Hinaje “Comparative study of
fuel-cell vehicle hybridization with battery or supercapacitor storage device,” IEEE Trans. Veh.
Technol., vol. 58, no. 8, pp. 3892–3905, Oct. 2009.
[4] L. Wang, E. G. Collins, and H. Li “Optimal design and real-time control for energy
management in electric vehicles,” IEEE Trans. Veh. Technol., vol. 60, no. 4, pp. 1419–1429,
May 2011.
[5] M. Zandi, A. Peyman, J. P. Martin, S. Pierfederici, B. Davat, and F. Meybody-tabar “Energy
management of a fuel cell/supercapacitor/battery power source for electric vehicular
applications,” IEEE Trans. Veh. Technol., vol. 60, no. 2, pp. 433–443, Feb. 2011

A nonisolated three port dc–dc converter and three-domain control method for pv-battery power systems

Recomendados

Recomendados

Mais conteúdo relacionado

Último

Último (20)

Destaque

Destaque (20)

A nonisolated three port dc–dc converter and three-domain control method for pv-battery power systems