ABSTRACT:
The
integration of Battery Energy Storage Systems (BESS) into the power grids has
been proposed as an effective solution for mitigating voltage and frequency
instability problems arising from the integration of renewable resources with intermittent
patterns. One of the most important applications of BESS is to restore an electric
power system to operation without counting on the external transmission
network. To prevent potential damage to the expensive equipment of power plant,
the converters must generate a high quality and reliable three phase voltage.
This research provides a simulation-based investigation in order to scrutinize
different multi-level inverter topologies to find the more appropriate
multi-level inverter structure for BESS application. The investigation has been
done entitled of quantitative and qualitative studies. Throughout the quantitative
study, the output specifications of each inverter topology is scrutinized,
while other features such as reliability, modularity and functionality are
scrutinized as qualitative study. All topologies are simulated in MATLAB/Simulink
at the same operating conditions.
KEYWORDS:
1. Multilevel
converter
2. Battery
energy storage
3.
High power application
SOFTWARE: MATLAB/SIMULINK
DIFFERENT TOPOLOGIES:
Fig.
1. One leg representation of multi-level topologies. a) NPCMLI, b)
CCLMLI,
c) CMLI, d) ZsMLI, e) QZsMLI.
Fig.
2. Multi-level topologies classification.
EXPECTED SIMULATION RESULTS:
Fig.
4. Voltage and current waveforms of three level battery source capacitor clamped
inverter.
Fig.
5. Voltage and current waveforms of three level cascaded battery source inverter.
Fig.
6. Voltage and current waveforms of three level Z-source battery connected
inverter.
Fig.
7. Voltage and current waveforms of three level Quasi-Z source battery connected
inverter.
CONCLUSION:
In
this paper the most common multilevel inverter topologies were scrutinized to
find the more appropriate topology for BESS application. The investigation has
been done entitled of quantitative and qualitative studies. The important
output parameters of inverter topologies were investigated as quantitative study,
while other features such as reliability, modularity and functionality were
scrutinized in qualitative study. Also, various inverter topologies have been
evaluated in terms of required capacity in the same operating point. The
simulation results proved that the ideal BESS power conversion system, among
reviewed multi-level topologies, is Cascaded topology. This topology was chosen
for three reasons. First, the efficiency and reliability studies were
conducted, and the CMLI was found to be the most efficient and reliable
topology with minimum amount of power loss compared to other topologies. Second,
it subdivides the battery string and increases the high voltage functionality.
Finally, capacitor volume, cost and THD studies were again confirmed the
effectiveness of this topology in battery energy storage systems.
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[1]
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