摘要
对电力系统稳定器的设计方法、性能特点作了讨论。仿真实验表明,高阶、非线性输电系统可用低阶、线性模型来表示,且模型的参数可用最小二乘法来辨识;极点移动的自校正调节器最适合电力系统应用;同传统的PSS相比,自适应电力系统稳定器,提供了更好的阻尼。提出解决干扰出现后辨识器参数不能收敛问题的一种新方法:首先模拟各种可能出现的大干扰,辨识出系统在这些状态下的参数值并存于计算机中;系统一旦出现大干扰时,可借助继电保护信号迅速地判断干扰的类型,然后将相应的参数值调出,设计控制器,计算控制作用。仿真结果表明,这种措施能保证系统在出现大干扰的情况下,具有良好的动态响应。
Discusses the design method and characteristics of adaptive power system stabilizer. Presents a new method to solve the problem that the parameters estimates after a large disturbance can't converge to their true values immidiatly. Identifies the system parameter values caused by various simulated large disturbances and stores them in advance in computer. Whenever a large disturbance appears, its type may be recognised quickly with the aid of relay protective signals, and then the relative parameter values can be taked out to design the controller and compute control action. The simulation demonstrates the method proves better dynamic responce when a large disturbance occurs.
关键词
自适应
控制器
电力系统
稳定性
Power system stability
Power system dynamic stability
Power system steady-state stability
System oscillation
Adaptive control
Self-adaptive controllers
