Research On Subsynchronous Resonance Supression By Supplementary Excitation Damping Control

In this thesis, we proposed a solution of suppression of SSR based on SEDC after in-depth analysis of the causes, characteristics, and common solutions of subsynchronous resonance (SSR), and design the supplementary excitation damp controller for SSR suppressing. Then, we optimize the parameters of supplementary excitation damp controller (SEDC) by GASA algorithm to make the designed controller have good effect in different conditions. Simulation of SSR in several typical faults was done to validate the principle and effect of SEDC after modeling of generators in ShangDu Plant. The results of simulation show that the effect of SEDC in SSR suppression is great. At last, the principle and effect of SEDC are validated by field test in ShangDu Plant. The result of field test and a detailed analysis is given to further verify the effect of SEDC in SSR suppression. This new method in SSR suppression has a great reference value to other plants which are far from grid.