Abstract:According to the structural features of power system stabilizer PSS4B, a hybrid PSO algorithm is applied to PSS4B parameters optimization in this paper. By connecting RTDS analog input/output interface card with NES6100 excitation regulator, the semi-physical simulation system is constituted, the single machine infinite model is established on RTDS real-time digital simulation platform. Based on testing the phase frequency characteristic without compensation of generator excitation system and parameters optimization, PSS4B critical gain experiment, step response test on load, short circuit disturbance test and inverse-regulation effect test is carried out in turn. The test results show that the optimized PSS4B can suppress power oscillation well in different frequency bands, and have good inverse-regulation suppression effect.