Optimal design of SEDC for damping multi-mode SSR based on GASA

In this paper, a near-optimal and robust SEDC (supplemental excitation damping control) has been developed for damping SSR (subsynchronous resonance) in Shangdu power plant in China . This paper first gives a brief analysis of the multi-mode SSR in Shangdu system, and then provides the configuration of SEDC to provide damping for all SSR modes. The primary contribution of this paper lies in the presented method GASA, in which GA (genetic algorithm) and SA (simulated annealing) are combined to solve the SEDC optimal parameter-searching problem. The details of this approach are presented, and the performance of the SEDC obtained by GASA is verified with the Shangdu system through eigenvalue analysis and electromagnetic simulations.