Realization of a Solar MPPT Regulator for the Control of a DC-DC Converter
No Thumbnail Available
Files
Date
2021
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The work presented is concerned with the analysis, modelling and simulation of the electrical
electrical operation of a photovoltaic system with a digital control (MPPT control)
for tracking the maximum power of the photovoltaic (PV) panels. In a first step, the PV systems,
the principles of PV conversion and the technical characteristics of PV cells. In a second step,
we analyzed the techniques of MPP tracking for the extraction of the maximum power under
different operating conditions, known as the MPPT technique based on the
based on the algorithms of inductance incrementing, perturbation and observation and Hill
climbing algorithms followed by a comparison of the three algorithms in terms of
accuracy and stability. Our judgment is that the Perturb and observe technique is the most
suitable as it is easier to program and has an acceptable speed for our application.
Then we described in more detail the operation of the DC-DC
because they are the main component of the photovoltaic system.
The role of a DC-DC converter with integrated MPPT plays the role of an automatic impedance
matching of the load to ensure maximum power transfer.
In our work, we used a buck converter with MPPT with a control following the Perturb and
observe algorithm installed on an Arduino Uno board. The buck converter was chosen because
this type of converter has the best efficiency compared to other types, and that the open circuit
PV voltage is11.1Vand the voltage at the maximum power point is 9V, which means that the
source voltage is always higher than the voltage required by the load (a 6V battery).
By simulating the converter with the Proteus software, we were able to determine by trial and
error the values of the components, in particular the resistors, the capacities and the inductance
for the best possible performance.
At the end of the simulation we had built the prototype buck converter with MPPT.
The prototype was then subjected to various tests and measurements to fine-tune it by varying
the radiation. The results obtained are satisfactory despite the relatively low power output.
The placement of a heat sink had reduced the heating of the battery.
In perspective, we admit that the prototype can be further improved by increasing the power
conversion by adding more powerful components with heat sinks to protect them.