Aiming at the problem of significant spatial differences in the frequency response process of each node in the new energy power system
in order to improve the frequency stability of the system
a virtual inertia optimal configuration method considering node frequency security constraints is proposed. Firstly
the frequency disturbance rejection capability of each node is analyzed by using the node equivalent inertia index
and the spatial distribution characteristics of the system inertia are quantitatively characterized. Furthermore
the system frequency response model with synchronous generators and renewable power resources is established
and the system COI frequency index and node frequency index are calculated. Then
the equivalent inertia of the node is introduced into the objective function
and the virtual inertia optimal configuration model considering the COI frequency security constraint and the node frequency security constraint is established respectively
and the evaluation standard of the equivalent inertia adequacy of the node is proposed. Finally
the improved IEEE 39-bus system simulation example analysis shows that the virtual inertia optimal configuration considering the node frequency security constraint can improve the system frequency response performance and realize the system inertia level evaluation at the node level.
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