An Adaptive Control Scheme for Flexible Power Point Tracking in Photovoltaic Systems

H. Dehghani Tafti, A. Sangwongwanich, Y. Yang, J. Pou, G. Konstantinou, F. Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

36 Citations (Scopus)
266 Downloads (Pure)

Abstract

One of the major concerns associated with the increasing penetration of grid-connected photovoltaic (PV) power plants is the operational challenges (e.g., overloading and overvoltage), imposed due to the variability of PV power generation. A flexible power point tracking (FPPT), which can limit the PV output power to a specific value, has thus been defined in grid-connection regulations to tackle some of the integration challenging issues. However, the conventional FPPT algorithm based on the perturb and observe method suffers from slow dynamics. In this paper, an adaptive FPPT algorithm is thus proposed, which features fast dynamics under rapidly changing environmental conditions (e.g., due to passing clouds), while maintaining low power oscillations in steady-state. The proposed algorithm employs an extra measured sampling at each perturbation to observe the change in the operating condition (e.g., solar irradiance). Afterwards, the voltage-step is adaptively calculated following the observed condition (e.g., transient or steady-state) in a way to improve the tracking performance. Experimental results on a 3-kVA grid-connected single-phase PV system validate the effectiveness of the proposed algorithm in terms of fast dynamics and high accuracy under various operational conditions.
Original languageEnglish
Article number8457276
JournalIEEE Transactions on Power Electronics
Volume34
Issue number6
Pages (from-to)5451-5463
Number of pages13
ISSN0885-8993
DOIs
Publication statusPublished - Jun 2019

Keywords

  • Adaptive voltage-step calculation
  • Flexible power point tracking
  • Heuristic algorithms
  • Maximum power point trackers
  • Photovoltaic panel powervoltage curve
  • Photovoltaic systems
  • Steady-state
  • Transient analysis
  • Voltage control
  • Voltage reference calculation

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