Wide-Area Damping Controller Design with TCSC Using Active Disturbance Rejection Control

The stability of power grid is severely impacted by low-frequency oscillations (LFOs). To prevent serious power system eventualities, these need to be properly damped. In case of modern power systems, FACTS devices are now widely used to effectively damp such oscillations with improvement in stability of system. Therefore, in this work, wide-area damping control (WADC) with thyristor-controlled series capacitor (TCSC) is designed for concerned inter-area modes using active disturbance rejection control (ADRC) technique. At a steady-state equilibrium operating point, the system is linearized, and modal analysis is used to extract crucial LFO modes. Moreover, geometric method is used to identify the appropriate feedback for WADC. Dynamics of 11-bus system is simulated to prove the adequacy of proposed WADC. Results obtained using MATLAB/SIMULINK indicates that appropriate damping performance is achieved via suggested WADC architecture.