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Multiport bidirectional DC–DC converter for PV powered electric vehicle equipped with battery and supercapacitor

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IET Power Electronics
Authors:
Murat Mustafa Savrun at Adana Alparslan Türkeş Science and Technology University
Murat Mustafa Savrun
  • Adana Alparslan Türkeş Science and Technology University
Alihan Atay at Adana Science and Technology University
Alihan Atay
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Abstract and Figures

This study presents a novel quasi-Z-source converter integrated isolated multiport bidirectional DC–DC converter topology for a photovoltaic (PV) powered and battery/supercapacitor buffered electric vehicle (EV). The proposed topology can provide uninterrupted power to the electric motor of EV and regain the braking energy with the capability of bidirectional power flow. The system integrates quasi-Z-source and H-bridge converters with an existing switch. Thus, a four-port converter is achieved without any need for individual converters or additional switches. Besides, the high-gain quasi-Z-source converter allows the reduction of the rated voltages of the battery and supercapacitor packs, as well as allows using a high-frequency transformer (HFT) with a low turn ratio. The isolation between ports is provided by a secondary centre-tapped HFT. The secondary side of the HFT is equipped with a controlled full-wave rectifier to provide bidirectional power flow. In addition, a power flow management and corresponding control scheme are suggested. The performance of the proposed system has been evaluated for different operational changes. Results show that it properly performs the power flow between the ports under steady-state and transient conditions. The power flow capabilities and efficiency values validate the viability and effectiveness of the proposed system.
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IET Power Electronics
Research Article
Multiport bidirectional DC–DC converter for
PV powered electric vehicle equipped with
battery and supercapacitor
ISSN 1755-4535
Received on 21st June 2020
Revised 20th November 2020
Accepted on 23rd November 2020
E-First on 19th January 2021
doi: 10.1049/iet-pel.2020.0759
www.ietdl.org
Murat Mustafa Savrun1 , Alihan Atay2
1Department of Electrical & Electronics Engineering, Adana Alparslan Türkeş Science and Technology University, Adana, Turkey
2Solvaytech Engineering Industry and Trade Ltd Co., Adana, Turkey
E-mail: msavrun@atu.edu.tr
Abstract: This study presents a novel quasi-Z-source converter integrated isolated multiport bidirectional DC–DC converter
topology for a photovoltaic (PV) powered and battery/supercapacitor buffered electric vehicle (EV). The proposed topology can
provide uninterrupted power to the electric motor of EV and regain the braking energy with the capability of bidirectional power
flow. The system integrates quasi-Z-source and H-bridge converters with an existing switch. Thus, a four-port converter is
achieved without any need for individual converters or additional switches. Besides, the high-gain quasi-Z-source converter
allows the reduction of the rated voltages of the battery and supercapacitor packs, as well as allows using a high-frequency
transformer (HFT) with a low turn ratio. The isolation between ports is provided by a secondary centre-tapped HFT. The
secondary side of the HFT is equipped with a controlled full-wave rectifier to provide bidirectional power flow. In addition, a
power flow management and corresponding control scheme are suggested. The performance of the proposed system has been
evaluated for different operational changes. Results show that it properly performs the power flow between the ports under
steady-state and transient conditions. The power flow capabilities and efficiency values validate the viability and effectiveness of
the proposed system.
1Introduction
Nowadays, the interest in renewable energy sources (RESs) such as
photovoltaic (PV) or fuel cell is increasing in parallel with the
rapidly depleting fossil fuels and increasing greenhouse gas
emissions. Therefore, power systems equipped with RESs are
frequently preferred. Owing to the intermittent nature of RESs,
energy storage units (ESUs) play a key role to provide
uninterrupted power to the loads in these types of power systems.
Besides, the power electronic converters are the other essential
components to supervise the power flow between the RESs,
storage units, and loads. Fig. 1 shows the conventional RES-based
power system equipped with an ESU. The power produced by the
RES is transferred directly to the loads or storage units, while the
batteries are charged or discharged depending on the instantaneous
production values of RESs and demands of loads. Power transfers
between the units are carried out through independent power
electronics converters are the main interface element.
Recently, several studies have been performed regarding the
integrated power electronic converters used in a system with
multiple RESs or storage units (i.e. hybrid energy systems).
Especially, multiport DC–DC converters or the reduced switch
form of them are employed because of the compact structures with
reduced complexity, a lower cost, and fewer component counts [1–
4]. The multiport converters (MPCs) are categorised into two as
isolated and non-isolated converters and are presented in [5–7].
Non-isolated MPCs had been derived from the buck, boost, buck–
boost converter topologies with features of compact design and
high-power density. The non-isolated forms of MPCs developed in
[8–11] are used to meet the requirements of an EV equipped with a
battery/ultracapacitor, such as high energy/power density, and long
battery life.
Fig. 1 Conventional RES-based power system
IET Power Electron., 2020, Vol. 13 Iss. 17, pp. 3931-3939
© The Institution of Engineering and Technology 2020
3931
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