摘要
为了研究可调速双馈水轮发电系统静态稳定性和控制器反馈系数之间的关系,该文针对变速恒频双馈发电机运行特点和水轮机导叶开度调节结构,首先推导了具有刚性水锤效应的可调速双馈水轮发电机组的数学模型。其次,结合基于动态同步轴系下的双馈发电机双通道励磁控制策略以及有功功率参与反馈控制的水轮机调节系统模型,建立了以有功、无功和转差率为系统调节变量的闭环控制系统的状态方程。最后,利用李雅普诺夫函数概念和方法得到了闭环控制系统具有大域渐近稳定性的充分条件。分析结果表明,可调速双馈水轮发电机组的静态稳定性与控制器的反馈系数密切相关。
In order to study the relationship between the static stability and the feedback coefficients of their controllers for adjustable speed hydroelectric generating units with Doubly Fed Generators (DFG),firstly, the mathematical models of adjustable speed hydroelectric generating units concerning the rigid water hammer with DFG are derived in this paper. Secon-dly, by considering the dual-passage excitation control strategy of DFG based on dynamical synchronous reference frame and the model of hydraulic turbine regulation system with active power feedback,the state equations of the closed-loop control system with the regulation variables of the active power, reactive power and slip are established. Finally, by using the concept and method of the Lyapunov function, a sufficient condition for the approximate stability in the large field of the closed-loop control system is derived. It is shown that the static stability of adjustable speed hydroelectric generating units with DFG is interrelated to the feedback coefficients of their controllers.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2004年第6期152-156,共5页
Proceedings of the CSEE
