4 Testing the External P&O MPPT Algorithm

The developed P&O MPPT algorithm was validated using the BQ2575x Evaluation Module (EVM) in conjunction with the LP-MSPM0L1306 LaunchPad microcontroller. The LP-MSPM0L1306 was programmed with firmware implementing the flowchart shown in Figure 3-1. The objective of the testing was to verify correct operation of the external MPPT control loop, including proper VAC_DPM adjustment, IBAT measurement, and convergence to the maximum power point (MPP) under dynamic conditions.

While the fundamental P&O MPPT algorithm remained unchanged, parameters such as the VAC_DPM step size, delay time, and ADC sampling rate were adjusted to produce cleaner and more stable waveforms. These changes were made to improve waveform appearance without affecting the operation of the algorithm. Additional improvements can be made by tuning the VAC_DPM ramp rate, ADC update intervals, and perturbation step size to better match the solar panel and load behavior. A timer can also be implemented to run the P&O function periodically, rather than continuously, to further stabilize system performance during steady-state conditions.