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Stability Analysis of Grid-Following and GridForming Converters Based on State-Space Modelling
Xian Gao, Student Member, IEEE, Dao Zhou, Senior Member, IEEE, Amjad Anvari-Moghaddam, Senior Member, IEEE,
and Frede Blaabjerg, Fellow, IEEE
AAU Energy, Aalborg University, Aalborg, Denmark
Abstract - This paper conducts a comprehensive analysis
and comparison of the control loops of the grid-following
and grid-forming voltage source converters connected to
the power grid. Eigenvalue trajectories are studied in
order to obtain an accurate stability analysis. A timedomain simulation model of a 1.5 kW grid-connected
converter is developed by using Matlab/Simulink to
investigate the stability of the grid-following and gridforming control under different short-circuit ratios. The
stability boundaries of the grid-following control and the
grid-forming control are explored and compared with
theoretical analysis. The result reveals that the gridfollowing control is better suited for a stiff power grid,
while the grid-forming control is more suitable for a weak
power grid. Finally, an experimental prototype is
established to verify the effectiveness of the theoretical
analysis.
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