In this research, the study theory of system includes the use of an important source of renewable energy sources (solar source) and linking this system with an electrical load. The world is witnessing a significant rise in fossil fuel prices since the ending of the 20th century and now, this rise in price increases with the decrease in inventory day after day. Therefore, it turned that the field of attention to researchers of power generation to expand in non-conventional energy sources (new and renewable energy sources).New and renewable energy is inexhaustible in use because they rely on renewable natural resources. The mathematical model is an important part of the detailed study for PV systems. As well as study models for photovoltaic systems via the MATLAB/Simulink, this programming environment contains many models for renewable systems intended to perform simulation and analysis.Solar cells system needs to apply the MPPT algorithm due to the instability of external circumstances such as solar radiation and temperature.At a constant temperature of 25 °C, as the radiation level increases, the current and voltage of the module increase, this leads to an increase in output power. At a constant radiation level of 100 W/m2, as the module temperature increases, the current increases and the voltage decreases, this causes the output power to decrease. The maximum power is reached at 17 V and 3.5 A by the MPPT method. The Perturb and Observe algorithm is used to achieve maximum power.
During the operation of photovoltaic installations, the inconstancy of the energy characteristics of the flow of incident solar radiation adversely affects the generation of electrical energy. Consumers are highly dependent on climatic factors and solar insolation. For more efficient operation of generating solar installations, it is necessary to conduct detailed studies of the characteristics of the auxiliary and control equipment of the photovoltaic system. When using mathematical programs to simulate the operating modes of solar power generating systems, it is possible to significantly improve the operating parameters of control units and auxiliary systems and increase the generation of electrical energy. The paper presents an improved electrical diagram of a photovoltaic generating system, its control elements, and the efficiency of energy generation is increased. It also describes a method for modeling the operating modes of photovoltaic (PV) modules, implemented in the Matlab/Simulink program. In the work, it was necessary to define a circuit simulation model for the solar array to ensure interaction with the power converter. The characteristics of the solar cells, which are influenced by irradiation and temperature, are modeled by a circuit model. A simplified equivalent circuit for a diode equivalent PV system is used as a model. The simulation results are compared with different types of PV module data. As a result of the work, it was shown that the created simulation blocks in the Matlab/Simulin system well simulate the operation of solar panels, while they are compatible with different types of photovoltaic modules and are convenient in providing various operating modes. In the study of real operating modes of the proposed generating system, the possibility of increasing the generation of electrical energy was shown. When using the proposed circuit solutions for the operation of solar installations, it is possible to significantly increase their efficiency, extend the trouble-free operation, and increase the service life of the equipment. The conducted research contributes to a better use of blocks of photovoltaic systems used to provide electrical energy to industrial, municipal and individual consumers. The circuit solutions proposed in the work are possible for use both at large solar power plants operating in parallel with the general energy system, and at small photovoltaic installations used to provide individual consumers.
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