Design of TCSC damping controller for SSO suppression based on TLS-ESPRIT

In this paper, a new subsynchronous oscillation (SSO) detection method based on the total least squares-estimation of signal parameters via rotational invariance technique (TLS-ESPRIT) is proposed. By analyzing the time domain simulation data of the power system, the TLS-ESPRIT based algorithm can extract the features of oscillation modes, such as initial amplitudes, oscillation frequencies, damping factors, and initial phases. Using this SSO detection method, the characteristics of the SSO problem are investigated when thyristor-controlled series capacitor (TCSC) operates in different conditions. After that, a TCSC damping controller is adopted to suppress SSO. The parameters of TCSC damping controller are designed aiming for the optimal phase compensation, which are obtained by TLS-ESPRIT based algorithm. The simulation results show that TCSC damping controller designed by this method can suppress SSO under different operating conditions of TCSC.