摘要
本文从多机电力系统总阻尼的概念出发,证明了多变量励磁控制并不增加电力系统总阻尼。在AVR的基础上附加转速、功角、功率,乃至于附加远方机组任意信号的复杂多变量励磁控制方式下,电力系统总阻尼保持守恒,其数值与单纯AVR控制时相等。由于电力系统所有模式阻尼之和为常数,所以在试图增加某一模式阻尼时必然导致削弱其他模式的阻尼。这是设计多变量励磁规律时的阻尼竞争现象。附加励磁控制的实质仅仅是在各模式阻尼相互竞争、彼此消长中寻求协调与平衡。当系统满足阻尼守恒条件时,给所有模式增加阻尼的企图是不可实现的。
Based on the conception of general damping of multi-machine power systems, it is proved that additional excitation control does not increase general damping of power systems. When AVR is added to other signals, such as speed, angle, active power, et al., power systems have equal damping is a constant that does not change on any conditions of general damping. Because total amount of all the modes＇ additional excitation, damping competition will happen in the course of designing additional excitation rule. The essence of additional excitation control is only a coordinate strategy, and maintaining damping equilibrium among all the modes＇ is the real subject. The phenomenon of damping competition indicates that when a mode＇s damping is added, another mode＇s damping will be reduced. So an excitation rule designer＇s work is seeking for a compromise idea which makes all of the modes＇ damping reasonable. And a designer must realize that the attempt to increase every mode＇s damping is not always available.
出处
《电工电能新技术》
CSCD
北大核心
2006年第4期39-42,57,共5页
Advanced Technology of Electrical Engineering and Energy
基金
贵州省科学技术基金资助项目(黔科合J字[2006]2114号)
关键词
电力系统
励磁控制
阻尼特性
阻尼竞争
小干扰稳定
低频振荡
power systems
excitation control
damping competition
damping character
small-signal stability
low frequency oscillations
