考虑时滞影响的分层非线性全局控制器的设计

Nonlinear Hierarchical Global Controller Considering Wide-Area Information Delays

提出了基于广域信息的分层控制器结构,第一层是负责计算全局信息(如功角中心、角速度中心)的广域控制器,第二层是将本地测量信号与全局信息相结合以得到控制规律的本地控制器.同时,为了克服基于线性二次调节的非线性全局控制器易受时滞影响的弊端,应用线性矩阵不等式的H∞控制理论提出了新的计及时滞影响的非线性全局综合控制器.四机系统的仿真结果表明,当考虑广域信息的时滞影响时,该控制器仍能快速平息系统的振荡,提高系统的稳定性.

A two-level hierarchical structure is proposed to improve the stability of multi-machine power systems. The scheme consists of a local controller for each generator at the secondary level associated by a wide-area controller at the first level. The wide-area controller is in charge of evaluating the global signals, such as the center of rotor angle, and the center of rotor speed. And the local controller combines the local signals with the global ones to achieve the feedback control law. To eliminate the effect of global signal delays, a novel nonlinear global controller is presented with inverse system algorithm and linear matrix inequality technique. The digital simulation demonstrates that for various time delay the nonlinear global controller quickly damps down system oscillations and enhances transient stability of multi-machine power system.