Application and Improvement of Hilbert-Huang Transform in Subsynchronous Oscillation Mode Parameter Identification

The standard Hilbert-Huang transform method has modal aliasing phenomenon during the empirical mode decomposition. In order to use the Hilbert-Huang transform to fully identify the subsynchronous oscillation modal parameters, an improved Hilbert-Huang transform method is proposed. After filtering the simulation signal of the subsynchronous oscillation, the Hilbert-Huang transform is applied to identify the modal parameters of the subsynchronous oscillation. Finally, based on the simulation case of the IEEE first standard model of subsynchronous oscillation, the improved Hilbert-Huang transform is used to identify the subsynchronous oscillation modal parameters. The simulation results show that the method can fully identify the subsynchronous oscillation modal parameters.