An Integrated Control Algorithm for a Single-Stage PV Pumping System Using an Open-End Winding Induction Motor

Abstract

In this paper, a single-stage solution for solar photovoltaic (PV) pumping system using a dual-inverter fed open-end winding induction motor drive is presented. The three-level dual-inverter requires a low PV bus volt agecomparedwithitsconventionalthree-levelcounterpart. This could avoid large string of PV modules and helps in reducing the voltage rating of the capacitors and semicon ductor devicesused in the system. This may further help in reduction of cost of the system. The proposedsingle-stage system is operated using an integrated control algorithm, which includes the maximum power point tracking (MPPT), the V/f control, and the sample-averaged zero-sequence elimination (SAZE) pulsewidth modulation (PWM) tech nique. While the MPPT algorithm ensures the extraction of maximum power from the PV source, the V/f control improves the motor pump performance. Furthermore, the zero-sequence current is avoided by the SAZE PWM algo rithm. Thus, the integrated control algorithm improves the overall performance of the system. Furthermore, this paper also presents the details of system design and analysis of its dynamic behavior during transient environmental conditions. The performanceof the systemis verifiedusing MATLAB simulation and hardware prototype