Subsynchronous Damping Controller With STATCOM: Design and Simulation

This paper provides a comprehensive overview of the design and performance evaluation of a subsynchronous damping controller implemented with Static Synchronous Compensator (STATCOM) technology. We begin by introducing the background and causes of subsynchronous oscillations in power systems, then explore the controller design methodology involving signal processing algorithms for oscillation detection and phase compensation techniques. The implementation employs MATLAB/Simulink for modeling the power system network, STATCOM dynamics, and damping control logic using transfer function blocks and State-Space representations. The simulation approach includes developing custom S-functions for advanced control algorithms and utilizing Powergui for phasor simulation analysis. Performance validation involves time-domain simulations analyzing damping effectiveness under various disturbance scenarios using step response and frequency sweep tests. The controller's performance is compared with conventional subsynchronous damping solutions through key metrics including damping ratio calculation and eigenvalue analysis. The discussion covers advantages in response speed and stability margins, while also addressing implementation challenges and potential future enhancements such as adaptive control algorithms and real-time digital signal processing integration.