发电机励磁及SVC非线性最优协调控制

发电机励磁和静止无功补偿器(static var compensator,SVC)对远距离输电的稳定性有很大影响。为了提高系统在大扰动情况下的暂态稳定性,提出一种发电机励磁系统与SVC协调非线性最优控制方法。通过建立发电机励磁与SVC系统的综合模型,将微分几何反馈线性化理论与线性最优控制理论相结合,设计了发电机励磁与SVC系统的非线性最优协调控制规律。控制信号实现了本地化,避免了远距离的信号传输。仿真结果证明,该控制方法能同时改善系统的功角稳定性和电压稳定性。

Optimal Nonlinear Coordinated Control between Generator Excitation and SVC

The influence of generator excitation system and static var compensator(SVC) on the stability of long-distance transmission system is great.A nonlinear coordinated control of SVC and generator excitation is presented to improve the transient stability of power system in the presence of large disturbance.Firstly,a model including SVC and generator excitation is developed.Then,based on the differential geometric feedback linearization method of nonlinear system and the optimal control theory of linear system,a rule of optimal nonlinear coordinated control for SVC and generator excitation is designed.The control signal can realize the localization and avoid the remote signal transmission.Simulation results show that,by use of the proposed control strategy,the stability of power angle and voltage can be improved.