TY - JOUR
T1 - Large-Signal Stability of Grid-Forming and Grid-Following Controls in Voltage Source Converter
T2 - A Comparative Study
AU - Fu, Xikun
AU - Sun, Jianjun
AU - Huang, Meng
AU - Tian, Zhen
AU - Yan, Han
AU - Iu, Herbert Ho Ching
AU - Hu, Pan
AU - Zha, Xiaoming
PY - 2021/7
Y1 - 2021/7
N2 - 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.
AB - 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.
KW - energy function
KW - grid-following control
KW - grid-forming control
KW - La Salle's Invariance Principle
KW - large-signal stability
KW - Voltage source converters
UR - http://www.scopus.com/inward/record.url?scp=85098746644&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2020.3047480
DO - 10.1109/TPEL.2020.3047480
M3 - Article
AN - SCOPUS:85098746644
SN - 0885-8993
VL - 36
SP - 7832
EP - 7840
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 7
M1 - 9309174
ER -