Control strategy for an off-grid photovoltaic system in Haiti
Fecha
2022-09-06Primeiro coorientador
Rech, Cassiano
Primeiro membro da banca
Giacomini, Julian Cezar
Segundo membro da banca
Azevedo, Gustavo Medeiros de Souza
Metadatos
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World energy demand is increasing in the same proportion as the population
density and its electrical energy supply comes largely from the use of fossil fuels, whose
main characteristic is their negative impact on the environment. However, renewable
energy resources represent a major alternative in the energy matrix that can reduce
the environmental problems caused by fossil fuel sources while addressing this global
energy demand. The contribution of solar energy indirectly from other renewable energy
resources makes it even more special to develop the direct exploitation of solar energy
resources. Thus, due to the ease of implementation at any size of a solar system and the
decreasing price of solar modules on the world market, its exploitation has been promising
and the development of all the elements that make up a photovoltaic system has been
receiving special attention from the scientific community and some industrial sectors.
However, depending on the use of the solar system or the desired energy efficiency of
the system, it would be appropriate to use a battery storage system to store the excess
energy produced by the PV modules. This thesis presents an off-grid solar photovoltaic
system with a lead acid battery bank that highlighting a control strategy through a
dual-stage cascaded energy conversion topology which is composed of an MPPT boost
DC-DC converter at the input, an DC-DC interleaved bidirectional battery-bank converter
and also a DC-AC inverter. The objective of the proposed control strategy is to adequately
control the power flow through the DC-DC MPPT converter, the DC bus independently
of the solar irradiation and the DC-DC interleaved bidirectional battery-bank converter
that responsible to charge/discharge the battery-bank while providing power to the AC
loads. To achieve this objective, the power injected into the DC link is controlled using
two integrated control loops that calculate the difference between the input and output
power levels to inject or extract it from the battery bank under different operating points.
Simulation results are included for a 1.6 kW PV system to validate the proposed control
strategy.
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