Assessment of perturb and observe MPPT algorithm implementation techniques for PV pumping applications

Mohammed A. Elgendy, Bashar Zahawi, David J. Atkinson

Research output: Contribution to journalArticlepeer-review

696 Scopus citations


The energy utilization efficiency of commercial photovoltaic (PV) pumping systems can be significantly improved by employing simple perturb and observe (P&O) maximum power point tracking algorithms. Two such P&O implementation techniques, reference voltage perturbation and direct duty ratio perturbation, are commonly utilized in the literature but no clear criteria for the suitable choice of method or algorithm parameters have been presented. This paper presents a detailed theoretical and experimental comparison of the two P&O implementation techniques on the basis of system stability, performance characteristics, and energy utilization for standalone PV pumping systems. The influence of algorithm parameters on system behavior is investigated and the various advantages and drawbacks of each technique are identified for different weather conditions. Practical results obtained using a 1080-Wp PV array connected to a 1-kW permanent magnet dc motor-centrifugal pump set show very good agreement with the theoretical analysis and numerical simulations.

Original languageBritish English
Article number6102293
Pages (from-to)21-33
Number of pages13
JournalIEEE Transactions on Sustainable Energy
Issue number1
StatePublished - Jan 2012


  • DC-DC power conversion
  • maximum power point tracking (MPPT)
  • photovoltaic (PV) power systems
  • photovoltaic (PV) pumping
  • stability


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