Large-Signal Stability of Grid-Forming and Grid-Following Controls in Voltage Source Converter: A Comparative Study

Xikun Fu, Jianjun Sun, Meng Huang, Zhen Tian, Han Yan, Herbert Ho Ching Iu, Pan Hu, Xiaoming Zha

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The grid-forming and grid-following controls are adopted in three-phase voltage source converters according to different grid conditions. However, the basic operation principle of the two kinds of control are different and will leads to the instability of the grid-connected system through various paths. In this paper, the energy function model of the grid-forming and grid-following controlled converters are established and compared in detail. The influence of system parameters is studied, and the large-signal stability boundaries are derived through a general method. Moreover, compared to the grid-forming controlled converter, the grid-following converter will lose stability by exhibiting a varying damping coefficient transient. The equivalent damping coefficient can be used as a criterion of whether the grid-forming/following control is suitable for the weak/strong grid condition. The simulation and experiment results show the difference of the transient process and validate the control criterion for different grid strength under large-signal disturbance.

Original languageEnglish
Pages (from-to)7832 - 7840
JournalIEEE Transactions on Power Electronics
Volume36
Issue number7
DOIs
Publication statusPublished - Jul 2021

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