网络化多机电力系统的分布协调控制和暂态联结稳定性分析

Distributed coordination control and transient connective stability of networked multi-machine power systems

针对n个同步发电机互联电力系统暂态过程中出现的发电机失步现象,为了控制任意两台电机之间的转角差,提出一种新的分布式协调控制设计方法.将整个系统对对分解为n-1个子系统,设计分布式协调控制律,估计子系统的局部稳定区域,得到判定联结稳定性的定理;通过一个三机系统的算例,给出判别方法的应用.算例表明,这种判别方法能够简化系统稳定性分析的复杂性,并能够降低计算量.

Considering transinent stability of an n-machine interconnected power system when a large disturbance lead to a loss of synchronism, a novel distributed coordination control methed is proposed in order to control the rotor angle error to zero. A pairwise decomposition of the model is performed into n-1 interconnected subsystems. A distributed coordination controller is designed to guarantee the local stability of subsystems. The stability regions for each disconnected subsystems are estimated. Then, an aggregate model is constructed involving a vector Lyapunov function and the subsystem-region estimates is used to determine the stability of the overall system. A 3-generator example is given to illustate the effectiveness of the proposed method. This judging method can simplifly the complexity of system stability analysis and reduce the computation load.