Abstract: The global energy crisis in near future due to the rapid depletion of conventional fossil fuel resources and a consistently diminishing costs of solar photovoltaic (PV)modules, motivate towards an effective utilization of solar PV technology. In order to optimize the solar photovoltaic (PV) generated power using a maximum power point tracking (MPPT) technique, a DC-DC conversion stage is usually required in solar PV fed water pumping which is driven by a brushless DC (BLDC) motor. This power conversion stage leads to an increased cost, size, complexity and reduced efficiency. Here addresses a single stage solar PV energy conversion system feeding a BLDC motor-pump, which eliminates the DC-DC conversion stage. In addition, it constitutes the attractive merits of conventional topology , such as the elimination of BLDC motor phase current sensing and soft starting. The suitability of proposed system is validated through its performance and evaluation using MATLAB/Simulink based simulated results.
Key words: MPPT, Solar PV array, BLDC motor, Water pump, VSI, Soft starting, Speed control