多机AC-DC系统非线性协调暂稳控制

DECENTRALIZED NONLINEAR COORDINATED CONTROI FOR THE TRANSIENT STABILITY OF AC-DC POWER SYSTEMS

本文根据变结构理论和微分几何控制的思想,针对多机AC—CD电力系统暂稳控制问题提出处理某一类非线性互联系统的分散非线性变结构控制器的设计方法。根据系统的物理特点选取非线性滑行平面,以使系统进入滑动运动后表现出线性特性,这样可以方便地借用线性控制理论设计滑行平面参数,所设计的控制器是分散的,且参数容易选取。该方法的另一优点是滑行平面和控制器设计都是在子系统级进行的,非常适合于电力系统这样典型的大系统。从AD-DC暂稳控制的物理特性出发,我们从理论上证明了全局系统的稳定性。研究表明,该方法是处理电力系统暂稳控制的有效手段,控制器对系统参数摄动具有良好的鲁棒性。

The paper preaents a differential geometric approach for the decentralized nonlinear VSS control for the transient stability of AC-DCpower systems.Based on the characteristics of the system, the decentralized nonlinear sliding surface is chosen so that the reduced order dynamics exhibits a linear behavior in a sliding mode. Thus, we can use the linear control theory to select the parameters of the sliding surface. The controller is decentralized and its parameters are easy to be chosen. Moreover, it's particularly attractive to such large scale systems as power systems because the design is dealed with at the subsystem level. The global stability is proved by using VSS theory and the characteristies of the control for the transient stability of AC-DC power system. The results of simulation show that stability of power system and the controllers possess very high property of robustness for the perturbation in the system parameters.