抑制区间低频振荡的电力系统稳定器设计

摘要

随着互联电网规模增大,低频振荡对电网稳定的影响愈来愈大.本文提出一种基于广域测量信号的电力系统稳定器,通过选取合适的反馈信号和优化阻尼控制器的结构来设计广域电力系统稳定器的结构模型.利用粒子群优化算法优化广域电力系统稳定器的参数,使得广域阻尼控制器满足区域间功率振荡阻尼最大,从而起到更好地抑制区间振荡的作用.本文采用两区域互联系统为算例,通过仿真验证设计的稳定器在多种系统故障下对区间低频振荡的抑制效果,结果表明优化的电力系统稳定器能够较好地抑制区间低频振荡,提高系统阻尼水平.%The effect of low-frequency oscillation on the stability of power grid is increasing with the growing scale of in?terconnected power grid.In this paper,a power system stabilizer(PSS)based on wide-area measurement signal is pro?posed.The structure model of a wide-area PSS is designed by selecting proper feedback signals and optimizing the struc?ture of damping controller.Particle swarm optimization(PSO)algorithm is used to optimize the parameters of the wide-area PSS,such that the wide-area damping controller can satisfy the maximum interval power oscillation damping and better suppress the effect of interval oscillation.A two-region interconnection system is used as a numerical example to verify the suppression effect of the designed stabilizer on the interval low-frequency oscillation under a variety of system faults,and the results show that the optimal design of PSS can better suppress the interval low-frequency oscillation and improve the system's damping level.