The invention provides a
wind power integration
system small disturbance modeling and stability
analysis method considering
control delay, and the method comprises the steps: introducing a sampling
delay link, a zero-order holding link and a switch
delay link in a small disturbance
linearization modeling process, carrying out the
linearization processing through employing a first-order
inertia link, and building a unified
state space model; respectively constructing
control delay mathematical models of the direct-driven fan and the double-fed fan, and analyzing and identifying the influence of the
control delay on the oscillation mode and stability of the
system through characteristic values and impedance; and finally, performing
time domain simulation in the
simulation platform, and comparing a calculation result with a
simulation result to verify the accuracy of the model. The method can accurately reflect the small disturbance characteristics of the
wind power grid-connected
system in the sub-synchronous
frequency band and the super-synchronous
frequency band, provides a theoretical basis for optimization of
control parameters of a wind
turbine generator and evaluation of grid-connected stability, and solves the technical problem that the influence of control
delay is generally ignored in modeling of an existing
wind power grid-connected system.