부산대학교 도서관

Low-frequency oscillations (LFOs) are one of the significant threats to power system stability. They should be appropriately damped in order to avoid severe contingencies in the power system. Various methodologies are adopted to tackle these situations. In the modern power system scenario, management of the distribution side, i.e., load side, is a competent way to make the system stable. However, they are either deployed on the generation or transmission sides. Hence we propose a wide-area damping controller (WADC), which modulates active power on the load side to damp critical LFOs. This system is linearized at a stable operating point, and critical LFOs are identified using modal analysis. Furthermore, geometric measures are utilized to find suitable feedback signals for them. The WADC structure is considered as a one-stage power system stabilizer (PSS). The parameters of WADC are tuned by the metaheuristic particle swarm optimization (PSO) technique to achieve the desired damping ratio. To demonstrate the efficacy of the proposed methodology, dynamic simulations are conducted on 4-machine 11-machine system. Results are generated on MATLAB/SIMULINK ® platform, which suggests that the system is able to achieve the desired damping performance with the proposed WADC design.