研究目的
To present a modified perturb and observe (P&O) maximum power point tracking (MPPT) method for photovoltaic (PV) fed three-port DC‐DC converter in PV/battery hybrid system to reduce the drift problem.
研究成果
The modified P&O MPPT algorithm effectively reduces the drift phenomenon by including an additional loop for change in current (ΔI). It achieves stability and power balance under different operating modes with high MPP ratio, reduced oscillation, less tracking time, and overshoot. The algorithm's performance was validated through numerical simulations and laboratory tests, showing improved efficiency and faster response compared to the conventional P&O method.
研究不足
The study focuses on the drift problem in conventional P&O MPPT algorithms under changing insolation conditions. The experimental validation was limited to a specific PV array configuration and may not cover all possible scenarios in real-world applications.
1：Experimental Design and Method Selection:
The study involves the development and comparison of conventional and modified P&O MPPT algorithms for a PV/battery hybrid system interfaced with a three-port DC-DC converter. The modified P&O algorithm includes an additional loop to reduce drift by considering the change in current (ΔI).
2：Sample Selection and Data Sources:
The PV module was developed and interfaced to the three-port DC-DC converter using MatLab/Simulink environment. Experimental validation was performed using a DSPIC30F4011 microcontroller.
3：List of Experimental Equipment and Materials:
PV array, three-port DC-DC converter, DSPIC30F4011 microcontroller, electronic load set-up, and data acquisition system.
4：Experimental Procedures and Operational Workflow:
The performance of the modified P&O algorithm was tested under different operating modes (SISO, DI, DO) by changing insolation levels. The PV array voltage, current, and power were measured to validate the algorithm's effectiveness.
5：Data Analysis Methods:
The performance was assessed based on peak overshoot, settling time, MPP ratio, and stability. The tracking time and steady state oscillations were analyzed to compare the conventional and modified P&O algorithms.
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