Transient Synchronization Stability Mechanism of PMSG With Additional
Inertia Control
Abstract
Synchronous stability is crucial for the safety and operation of AC
power systems. However, most of the current researches focused on the
stability of grid-connected converters, and that of renewable equipment
still lacked. In this paper, the impact of the additional inertia
control (AIC) on the permanent magnet synchronous generator (PMSG) is
studied. It is found that with the AIC, the system dominant dynamics
shifts from the electromagnetic to electromechanical timescales. This
paper develops a simplified model for the single-PMSG infinite-bus
system with the AIC within the electromechanical timescale, and reveals
the transient synchronization stability mechanism from three aspects:
the machine-network interface, transient dominant variable, and
interaction between the synchronous loop and the power imbalance loop.
Finally, this paper analyzes the swing characteristics of the PMSG
system, and uncovers the relationship between the energy transmission
and synchronization. These findings could provide improved insights into
the synchronous stability mechanism of renewable-dominated new-type
power systems.