This paper analyzes the maximum power transfer capability of the grid-connected renewable energy generation system, which is mainly influenced by the short circuit ratio (SCR) and the resistance-inductance ratio (R/X) of grid impedance. It is revealed that an inverter connected to the AC grid with a larger SCR or a smaller R/X ratio has more power transfer capability. Besides, it is found that the critical conditions for the inductive grid and the resistive grid are different. Under an inductive grid, SCR = 1 is a critical point for effective power transmission. However, under a resistive grid, the SCR needs to be at least higher than 5 for effective power transmission. Finally, simulation results verify the effectiveness of the analysis.
Original languageEnglish
Journal2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)
Pages (from-to)1487-1490
Number of pages4
Publication statusPublished - 2021
Event 2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia) - , Singapore
Duration: 24 May 202127 May 2021


Conference 2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)


  • grid impedance
  • grid-connected inverter
  • power transfer capability
  • short circuit ratio


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