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Enhanced two-stage (photovoltaic-diesel) pumping system using DC-link voltage-based speed reference and backstepping MPPT controller

Author

Listed:
  • Rachida Kebbache
  • Abdelhamid Ksentini
  • El-Bahi Azzag
  • Saliha Maarouf

Abstract

This paper presents a hybrid water pumping system that integrates photovoltaic (PV) and diesel sources to supply a three-phase induction motor. The motor is controlled using a field-oriented control (FOC) strategy, where the reference speed is derived from the DC-link voltage rather than form the PV panel power. This simplified approach ensures efficient operation over the entire speed range without requiring precise motor efficiency data. To further improve performance, a backstepping controller is implemented for maximum power point tracking (MPPT), thereby improving energy extraction and minimising power fluctuations. The proposed method is benchmarked against conventional techniques, including incremental conductance (INC) and sliding mode control (SMC). Simulation results demonstrate the superiority of the backstepping-based MPPT, achieving up to 99.82% efficiency, a rapid reference speed settling time of 0.42 seconds, and higher pump power under variable irradiation. Overall, the system ensures reliable, efficient operation while reducing fossil fuel dependency and CO2 emissions.

Suggested Citation

  • Rachida Kebbache & Abdelhamid Ksentini & El-Bahi Azzag & Saliha Maarouf, 2026. "Enhanced two-stage (photovoltaic-diesel) pumping system using DC-link voltage-based speed reference and backstepping MPPT controller," International Journal of Energy Technology and Policy, Inderscience Enterprises Ltd, vol. 21(3), pages 306-329.
    • Handle: RePEc:ids:ijetpo:v:21:y:2026:i:3:p:306-329
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