Damping subsynchronous resonance with SVC based on DTA

In this paper, damping torque analysis (DTA) is adopted to study the subsynchronous resonance (SSR) damping characteristics with SVC. An in-depth investigation on the mechanism about how and why SVC can effectively provide damping to SSR is presented. The damping torque contribution from SVC is first distributed to each generator. Then the torsional modes are affected by the oscillation modes participation of each generator. According to the revealed damping distribution of SVC, a new method is introduced to design subsynchronous damping controller. Eigenvalue analysis shows that the controller with proper parameters can mitigate SSR well. Finally, the time domain simulations are also performed to demonstrate the effectiveness of the proposed controller under disturbance condition.