Abstract
Various maximum power point tracking methods (MPPT) for photovoltaic (PV) power systems have been considered and developed to maximize the delivered possible power. The output power of PV cells with nonlinear characteristics is affected by temperature, solar irradiation and load. In this paper, a modelized photovoltaic source is proposed, based on the Thevenin equivalent circuit at the beginning. A ordinarily employed solar system model is linearized into simple Thevenin source-resistance representation. Next, a control algorithm associated with the relationship between controller’s PWM duty cycle of the MPPT boost converter and solar array output power, namely proposed MPPT algorithm, is introduced. This proposed method is compared with an existing popular MPPT algorithm to confirm its superior performance by using the MATLAB/SIMULINK simulation. Finally, a 50W DC-DC boost converter prototype is implemented and tested to verify the feasibility of the proposed control scheme.
Highlights
The use of solar energy is increasingly encouraged because of its outstanding advantages in comparison with the conventional fossil fuel resources such as gasoline, coal, etc
The effectiveness and advantage of the proposed maximum power point tracking (MPPT) algorithm is verified by the way of simulation results
The simulation shows a comparison of the output powers in the PV system in which two different MPPT algorithms are employed, namely Perturbation and Observation method (P&O) and proposed MPPT algorithm
Summary
The use of solar energy is increasingly encouraged because of its outstanding advantages in comparison with the conventional fossil fuel resources such as gasoline, coal, etc. Instead of depending on fossil fuels, which are becoming exhausted, the use of solar energy will guarantee a boundless supply of energy for the future generation (Ram et al, 2017; Yousri et al, 2018). Maximum power point tracking techniques (MPPT) have been being used extensively in photovoltaic generation systems in order to maximize the output power of the PV array varying with ambient conditions such as solar irradiation and temperature. There is a typical maximum power point which will change along with the variation of solar radiation and temperature. MPPT means that the PV panel will be set to operate at maximum output power point and transfer the whole PV power to the load
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