In this paper, a single-stage solution for solar PhotoVoltaic (PV) pumping system using a dual-inverter fed Open-End Winding Induction Motor (OEWIM) drive is presented. The three-level dual-inverter requires a low PV bus voltage compared to its conventional three-level counterpart. This could avoid large string of PV modules and helps in reducing the voltage rating of the capacitors and semiconductor devices used in the system. This may further help in reduction of cost of the system. The proposed single-stage system is operated using an integrated control algorithm, which includes the
Maximum Power Point Tracking (MPPT), V/f control and Sample-Averaged Zero-sequence Elimination (SAZE) Pulse Width Modulation (PWM) technique. While the MPPT algorithm ensures the extraction of maximum power from the PV source, V/f control improves the motor-pump performance.And further, the zero-sequence current is avoided by the SAZE PWM algorithm. Thus, the integrated control algorithm improves the overall performance of the system. Further, this paper also presents the details of system design and analysis of its dynamic behaviour during transient environmental conditions. The performance of the system is verified using MATLAB simulation and hardware prototype.
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