研究目的
To propose and validate a new auto-scaling incremental conductance MPPT method for photovoltaic systems that improves tracking efficiency and convergence time under varying solar irradiation conditions.
研究成果
The proposed auto-scaling IncCond MPPT method significantly improves tracking efficiency (up to 99.48% average efficiency) and reduces convergence time (0.01 s) compared to conventional methods, with minimal steady-state oscillations. It is easily implementable on low-cost microcontrollers and performs well under rapidly changing solar irradiation, making it suitable for practical PV applications.
研究不足
The study focuses on specific PV modules and conditions in Saharan environments; generalization to other climates or PV types may require further validation. The algorithm's performance under extreme or partial shading conditions is not extensively covered.
1：Experimental Design and Method Selection:
The study involves designing a new MPPT algorithm based on incremental conductance with auto-scaling step-size, creating two operating areas with different step-sizes. Simulations and practical implementations are conducted using MATLAB/Simulink and a low-cost microcontroller.
2：Sample Selection and Data Sources:
The PV module used is ISOFOTON IS-75/
3：Solar irradiation data is sourced from a meteorological station in Adrar, Algeria, including test data, real data, and scenarios with fast, slow, and sudden changes in irradiation. List of Experimental Equipment and Materials:
PV panel (ISOFOTON IS-75/12), SEPIC DC-DC converter, microcontroller (PIC16F877A), current and voltage sensors, load, and simulation software (MATLAB/Simulink).
4：Experimental Procedures and Operational Workflow:
The MPPT algorithm is implemented in simulations and on hardware. Measurements of PV voltage and current are taken, and the duty cycle of the SEPIC converter is adjusted based on the algorithm. Tests are performed under various irradiation conditions to compare performance with conventional methods.
5：Data Analysis Methods:
MPPT efficiency is calculated using formulas for instantaneous and average efficiency. Results are analyzed for tracking speed, convergence time, and power fluctuations.
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