A non-iterative MPPT of PV array with online measured short circuit and open circuit quantities

This paper presents a non-iterative maximum power point tracking (MPPT) technique for solar photovoltaic (PV) panels. The non-iterative MPPT is realised using online measured open circuit voltage and short circuit current along with the Fill Factor extracted from the datasheet parameters of PV panel. The proposed MPPT returns a power reference, which is directly used in the inverter control loop. This non-iterative MPPT algorithm is implemented in a single-stage three-phase inverter feeding power to grid with a hysteresis current controller. Restructuring of the Converter power circuit is proposed to facilitate the online measurements of the dynamic panel values. DC link energy storage is provided to maintain power delivery to grid during momentary disconnection of the panel due to measurement. The design procedure and selection of all the ancillary components for the restructured power circuit are presented in detail. The system implemented in hardware for a power rating of 0.5 kW is tested under steady and dynamic states of possible irradiance including partial shading. The proposed non-iterative MPPT is found to be far superior in performance to the regular iterative MPPTs.