【摘要】 随着电力系统规模的不断扩大和快速励磁系统的引入,电力系统弱阻尼低频振荡问题日益突出。文中从机理上分析了电力系统弱阻尼产生的原因及采用电力系统稳定器PSS的附加励磁控制增加正阻尼转矩的原理。通过建立典型单机-无穷大系统发电机励磁控制系统的仿真模型,采用和作为PSS的输入量,模拟了系统在大扰动和小扰动下暂态过程的运行特性,仿真结果表明该设计能够有效地提高系统的阻尼作用,改善发电机的运行特性,提高了电力系统的动态稳定性。更多还原

【Abstract】 With the continuous spreading of scale in power system and introducing of fast excitation system,the problem of low frequency oscillation which is arosed because of lacking-damping becomes worse and worse.This paper analyzes the mechanism reasons of insufficient-damping,using an auxiliary control unit-power system stabilizer(PSS) to increase the damping torque.Through established a simulation model of excitation control system on a typical single machine-infinite bus system,taking and as its input signals,simulates the synchronous generator’s transient operating characteristics under large and small disturbances,and the simulation results show that the design can improve the system damping and the generator operating characteristics,increase power system dynamic stability.更多还原