ABSTRACT:
Solar Energy has been the most popular sources of
renewable energy for residential and semi commercial applications. Fluctuations
of solar energy harvested due to atmospheric conditions can be mitigated through
energy storage systems. Solar energy can also be used to charge electric
vehicle batteries to reduce the dependency on the grid. One of the requirements
for a converter for such applications is to have a reduced number of conversion
stages and provide isolation. Z-source inverter (ZSI) topology is able to
remove multiple stages and achieve voltage boost and DC-AC power conversion in
a single stage. The use of passive components also presents an opportunity to
integrate energy storage systems (ESS) into them. This paper presents modeling,
design and operation of a modified Z-source inverter (MZSI) integrated with a split
primary isolated battery charger for DC charging of electric vehicles (EV)
batteries. Simulation and experimental results have been presented for the
proof of concept of the operation of the proposed converter.
KEYWORDS:
1.
Z-source-inverters
2.
Active filter
3.
Energy storage
4.
Photovoltaic
(PV) power generation
5.
Quasi-Zsource
inverter (qZSI)
6.
Single-phase
systems
7.
Transportation
electrification
8.
Solar energy
9.
Distributed
power generation
10. Inverter
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig.
1. Simplified Block Diagram of the System
EXPECTED SIMULATION RESULTS
Fig.
2. Simulation Waveform of the grid current,Ig, DC link voltage,VPN, Capacitor
Voltage,VC1, and Battery current,ib for the power balance between the
Photovoltaic input power, the AC Grid side and the battery power.
Fig.
3. Simulation Waveform for the power balance between the Photovoltaic input
power, the AC Grid side and the battery power.
CONCLUSION:
A
modified ZSI topology has been proposed in this paper is an attractive solution
for photovoltaic grid connected charging systems. It consist of a single stage
photovoltaic grid (PV-Grid) connection and an integrated charger for PV-Grid
connected charging or energy storage. This topology can be applied to centralized
configuration for charging in semi-commercial locations such as a parking lot
of a shopping mall. For residential applications, this idea can be extended to
string inverters with the charger side of the string inverter configurations
connected in series or parallel for current sharing. The paper proposes a an
energy storage topology using Z source converter through symmetrical operation
of its impedance network.
REFERENCES:
[1]
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[2]
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[3]
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[4]
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[5]
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