Comparative Study of the Transmission Capacity of Grid-Forming Converters and Grid-Following Converters

Bojun Kong, Jian Zhu, Shengbo Wang, Xingmin Xu, Xiaokuan Jin (), Junjie Yin and Jianhua Wang
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Bojun Kong: State Grid Yangzhou Power Supply Company, Yangzhou 210019, China
Jian Zhu: State Grid Yangzhou Power Supply Company, Yangzhou 210019, China
Shengbo Wang: State Grid Yangzhou Power Supply Company, Yangzhou 210019, China
Xingmin Xu: State Grid Yangzhou Power Supply Company, Yangzhou 210019, China
Xiaokuan Jin: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Junjie Yin: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Jianhua Wang: School of Electrical Engineering, Southeast University, Nanjing 210096, China

Energies, 2023, vol. 16, issue 6, 1-13

Abstract: The development trend of high shares of renewables and power electronics has increased the demand for new energy converters in the power system, but there is a lack of systematic research on the stability of different types of converters when transmitting power, which is worth exploring in depth. In this study, the power transfer capabilities of grid-forming and grid-following converters are investigated separately through an equivalent circuit diagram and phasor diagram when connected to the grid, and a quantitative relationship between converters’ power transmission limit and short circuit ratio under static stability conditions is obtained, leading to the conclusion that, in terms of power transmission, grid-forming converters are more suitable for weak grids with high damping and low inertia, whereas grid-following converters are more suitable for strong grids with high inertia. The conclusions are further verified by constructing the converter grid-connected models for different grid strengths through the PLECS simulation platform and the real-time simulation RTBOX1 and F28379D launchpad platform.

Keywords: grid-forming converter; grid-following converter; static power transmission limit; power coupling; short circuit ratio (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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