Banca de DEFESA: EDUARDO JOSE BARBOSA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : EDUARDO JOSE BARBOSA
DATE: 22/05/2023
TIME: 08:00
LOCAL: Departamento de Engenharia Elétrica (Térreo_Galpão); sala 014.
TITLE:

MAXIMUM POWER POINT SEARCH TECHNIQUES FOR PHOTOVOLTAIC MODULES BASED ON THE GLOBAL NONLINEAR ONE AND TWO DIODE MODEL.

KEY WORDS:

MPPT, GMPP, Irradiance, Multiple Peaks, Partial Shading.

PAGES: 208
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUMMARY:

Due to the rapid expansion of photovoltaic systems in the last decade, the need to locate the Maximum Power Point (MPP) to maximize the captured solar energy under various environmental conditions has become clear. When all modules in a photovoltaic array receive the same solar irradiance, traditional Maximum Power Point Tracking (MPPT) techniques can easily find the MPP. However, if the irradiance levels on the PV modules are not uniform, finding the global maximum power point Global Maximum Power Point - GMPP for these algorithms becomes infeasible, since these techniques can be left operating at a local maximum as long as shading remains. A partial shading, which can occur from shadows, clouds, buildings or trees, for example, exhibits in the power-voltage curve a behavior with multiple peaks, since the modules are protected by bypass diodes. In this context, in this paper two techniques are proposed that extract the GMPP from a power-voltage curve with multiple peaks. These techniques are compared to recent techniques in the literature where comparative simulation and experimental results are obtained and flowcharts are presented. It is worth noting that model-based techniques reduce energy losses because they have faster dynamic responses compared to heuristic techniques. Therefore, two model-based techniques are proposed, only one of them is valid only for photovoltaic string. One of these algorithms uses the two-diode model from the photovoltaic parameters estimated in an offline manner using Hybrid Pattern Search Technique (TH-PS). The other algorithm uses a diode model. As both techniques are model based, an irradiance microestimator has been proposed, whose purpose is to estimate the irradiance of each module at a low cost. This microestimator can also serve as monitoring of a photovoltaic (PV) plant, since it can send the irradiance information to a central computer via Wi-Fi, since it uses an ESP8266 for communication. Finally, after modeling the converter used for MPPT conditions, the dynamic results of simulations, using MATLAB software, and experimental results, using an experimental bench, for various climatic conditions are provided.

COMMITTEE MEMBERS:
Externo à Instituição - ALESSANDRO LUIZ BATSCHAUER - UDESC
Interno - 2921718 - FABRICIO BRADASCHIA
Interno - 1134081 - FRANCISCO DE ASSIS DOS SANTOS NEVES
Interno - 2889145 - GUSTAVO MEDEIROS DE SOUZA AZEVEDO
Externo à Instituição - LEANDRO MICHELS - UFSM
Presidente - 2378833 - MARCELO CABRAL CAVALCANTI