The application provides an online damping
control system and method for a main power
source type wind-
solar power station, which comprises the following steps: S1, adjusting parameters of
control algorithm software; S2, enabling a multi-
machine stability analysis module to calculate characteristic
modes of the wind-
solar power station; S3, calculating mode traction of each control parameter according to the characteristic
modes to obtain corresponding damping parameter adjustment amounts; S4, updating damping parameters of each unit, and calling the multi-
machine stability analysis module of the
power station again to complete online damping control; and S5, if damping parameter adjustment fails and the
system oscillates, sensing an oscillation frequency through a static synchronous
machine to inject concentrated damping to suppress oscillation. The application can improve damping of the overall
power station and reduce oscillation risk under the condition that operating states of each unit in the main power
source type wind-
solar power station change at any moment, and can realize rapid suppression of oscillation and reduce the duration of oscillation through concentrated damping injection of the static synchronous machine after the
system oscillates.