This paper presents an approach for designing parameters of power system stabilizer (PSS) and FACTS damping controllers in a large scale practical power system. The objective is maximizing damping ratio of the target mode

and tracking technology (MTT) is used to avoid frequent alternations of target mode in optimization procedures. An improved planted growth simulation algorithm (IPGSA)

which has high search efficiency and quick convergence speed

is proposed to optimize controller parameters coordinately. Based on case study of a large-scale power grid

and by using local and interregional low-frequency oscillation modes as target modes

simulation results verify proposed method in this paper. Furthermore

coordination optimization strategy adapted to multi-operating conditions demonstrates that the proposed approach is robust.