电力系统阻尼特性分析与研究  

Analysis and research of damping character of power systems

作　　者：郝正航[1] 邱国跃[1] 陈卓[1] 许克明[1] 

机构地区：[1]贵州大学电气工程学院,贵州贵阳550003

出　　处：《继电器》2005年第23期19-24,共6页Relay

摘　　要：分别从单机、多机电力系统线性化状态空间模型出发,证明了线性反馈励磁条件下,开环和闭环系统的总阻尼相等、轻载和重载工况下总阻尼相等,即一般电力系统具有阻尼守恒性。通过分析影响总阻尼的诸多因素,得出快速励磁是提供系统强阻尼主要保证,特征值计算和动态仿真证实了快速励磁可以显著改善电力系统小干扰稳定性。由于在不同负荷水平下,系统的总阻尼保持不变,所以只要励磁校正恰当,重负荷不会恶化系统阻尼。最后基于阻尼守恒性,指出在电力系统尤其是多控制器复杂电力系统中存在阻尼竞争现象,阻尼协调既非常必要又有较大难度。According to the linear state equations of simple power systems and complex power systems, it is proved that both open-loop system and close-loop system have equal general damping when linear feedback excitations are installed, that is to say that all the power systems have character of damping conservation. By analyzing several factors of influencing general damping, the paper concludes that fast excitation will afford strong damping to power systems. Meanwhile, the results of eigenvalues calculation and dynamic simulation prove that fast excitation system have the decisive influence to the small signal stability. At the same time, a conclusion is drawn that the general damping have not changed when load is heavy or not, and heavy load don＇t deteriorate the systematic damping as long as excitation law is reasonable. Finally, it is suggested that the phenomenon of damping competition exist in the power system because of damping conservation, especially in complicated power systems with multi-controllers. Damping coordination is very necessary and difficult.

关 键 词：电力系统 阻尼特性 快速励磁 动态稳定 小干扰稳定 

分 类 号：TM711[电气工程—电力系统及自动化]