dc.contributor.advisor |
Umenne, Patrice
|
|
dc.contributor.author |
Tshiani, Chrispin, Tumba
|
|
dc.date.accessioned |
2023-02-08T13:04:48Z |
|
dc.date.available |
2023-02-08T13:04:48Z |
|
dc.date.issued |
2022-08 |
|
dc.identifier.uri |
https://hdl.handle.net/10500/29789 |
|
dc.description.abstract |
Electrical energy storage is very important. Energy storage devices such as batteries and
capacitors can be used to store energy.
In this dissertation we investigate the use of a supercapacitor or electric double-layer
capacitor (EDLC) to store energy.
The EDLC, also known as a supercapacitor, is a new type of electrical energy storage
device used across many different fields in engineering. Firstly, two EDLC’s of values 300
F and 400 F were characterized by connecting them in a laboratory experiment to produce
their charge/discharge profiles under constant current. The EDLC’s datasheet
parameters including the capacitance and equivalent series resistance were then derived
from the acquired charge/discharge profile. In addition to this, the experimental
charge/discharge profiles were used to determine the parameters of the chosen EDLC's
using the equivalent circuit model called the "two branch" or Faranda model.
The derived "two branch" equivalent circuit parameters were then used to design a
Python/MATLAB/Simulink (PMS)-hybrid model of the EDLC's for simulation purposes.
The PMS model used the derived parameters as inputs and produced simulated
charge/discharge profiles for both the 300 F and 400 F EDLC’s. By superimposition, the
simulated and experimental charge/discharge profile were compared to evaluate the
accuracy and validity of the proposed PMS model. This was done to enable future
simulation in conjunction with a battery in a hybrid energy storage system (HESS) to show
the potential of the EDLC in improving battery lifespan.
Following the above, a 65 F, 16.2 V EDLC supercapacitor was sourced due to its midrange
capacitance and voltage close to a 12 V DC supply. This was done to investigate
whether the EDLC can help in reducing stress and prolong the battery lifespan in a hybrid
energy storage system (HESS). A laboratory experiment was setup for the EDLC to
produce its charge/discharge profile at a constant current of 5 and 10 A. As was done
with the previous 300 F and 400 F, the 65F, 16.2 V Faranda or “two branch model” mathematical parameters were extracted from the experimental charge/discharge profile
in preparation for its modelling. In keeping with the laboratory experiment, the EDLC was
connected with a 12 V lead-acid battery and a load to form a HESS, which was tested
under difference load conditions. Experimental battery data such as voltage, current, state
of charge (SOC) under HESS and battery energy storage system (BESS) without the
EDLC were compared.
To simulate a HESS, the extracted parameters from the 65 F, 16.2 V EDLC were used
as inputs to design the Python/MATLAB/Simulink (PMS) model of the EDLC. The PMS
model of the EDLC was then used as a subcomponent in a HESS system modelled in
MATLAB/Simulink. Using constant load conditions, the battery’s voltage, current, power
and state of charge (SOC) were analyzed for a BESS and HESS systems similar to what
was done in the experimental setup. Experiment and simulation were then compared.
In conclusion, due to the high variation of battery parameters in the BESS setup for both
experiment and simulation, and stability of the same battery values in the HESS setup,
the EDLC in the HESS setup indeed reduces stress on the battery and prolongs battery
lifespan. The unique contribution of this work lies in modelling the EDLC using python programming language before integrating the python algorithm to MATLAB and Simulink
to form the Python/MATLAB/Simulink (PMS) – hybrid model of the EDLC. |
en |
dc.format.extent |
1 online resource (xvii, 160 leaves) : illustrations (some color), graphs (color) |
en |
dc.language.iso |
en |
en |
dc.subject |
Battery Energy Storage System (BESS) |
en |
dc.subject |
Characterization |
en |
dc.subject |
Electric Double-Layer Capacitor (EDLC) |
en |
dc.subject |
Hybrid Energy Storage System (HESS) |
en |
dc.subject |
Microgrid |
en |
dc.subject |
Prolonging battery lifespan |
en |
dc.subject |
Python/MATLAB/Simulink (PMS) |
en |
dc.subject |
Hybrid Model |
en |
dc.subject |
Supercapacitor |
en |
dc.subject.ddc |
621.312424 |
|
dc.subject.lcsh |
Storage batteries |
|
dc.subject.lcsh |
Capacitors |
|
dc.subject.lcsh |
Electrochromic devices |
|
dc.subject.lcsh |
Microgrids (Smart power grids) |
|
dc.title |
The characterization of the electric double layer capacitor (EDLC) and its application in micro grids using the hybrid energy storage system (HESS) |
en |
dc.type |
Dissertation |
en |
dc.description.department |
Engineering, Science and Technology |
en |
dc.description.degree |
M. Sc. (Electrical Engineering) |
en |