Improved MPPT algorithm based on output properties of PV cells

Photovoltaic array simulation can be used to find better methods to implement maximum power point tracking (MPPT) control for efficient solar power systems. An accurate and practical model for photovoltaic arrays is developed with Matlab for the photovoltaic cell mechanisms. The model could simulate both the P-U and I-U characteristics of photovoltaic arrays for any insolation level and ambient temperature. Test results prove that the improved variable step optimization algorithm with current monitor circuit to alter the control rule make the photovoltaic system quickly and track the maximum power point accurately.