Benchmarking of Constant Power Generation Strategies for Single-Phase Grid-Connected Photovoltaic Systems

Ariya Sangwongwanich, Yongheng Yang*, Frede Blaabjerg, Huai Wang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

60 Citations (Scopus)
1057 Downloads (Pure)

Abstract

With a still increase of grid-connected photovoltaic (PV) systems, challenges have been imposed on the grid due to the continuous injection of a large amount of fluctuating PV power, like overloading the grid infrastructure (e.g., transformers) during peak power production periods. Hence, advanced active power control methods are required. As a cost-effective solution to avoid overloading, a constant power generation (CPG) control scheme by limiting the feed-in power has been introduced into the currently active grid regulations. In order to achieve a CPG operation, this paper presents three CPG strategies based on a power control method (P-CPG), a current limit method (I-CPG), and the perturb and observe algorithm (P&O-CPG). However, the operational mode changes (e.g., from the maximum power point tracking to a CPG operation) will affect the entire system performance. Thus, a benchmarking of the presented CPG strategies is also conducted on a 3-kW single-phase grid-connected PV system. Comparisons reveal that either the P-CPG or I-CPG strategies can achieve fast dynamics and satisfactory steady-state performance. In contrast, the P&O-CPG algorithm is the most suitable solution in terms of high robustness, but it presents poor dynamic performance.

Original languageEnglish
Article number8012524
JournalI E E E Transactions on Industry Applications
Volume54
Issue number1
Pages (from-to)447-457
Number of pages11
ISSN0093-9994
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • Active power control
  • constant power control
  • maximum power point tracking (MPPT)
  • photovoltaic (PV) systems
  • power converters

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