Stability of grid-connected modular multilevel converter with open- and closed-loop ac-side control

Paper in proceeding, 2017

The stability of grid-connected modular multilevel converter (MMC) under two control strategies is studied in this paper. For this purpose, the ac-side input admittance of the MMC is derived under openand closed-loop ac-side control strategies. The derived analytical models are used to investigate the impact of the two approaches on the stability of the MMC and detailed time-domain simulations are used to the verify the theoretical findings.