摘要
根据电力系统存在时滞的差异性,将控制器信号分为本地无时滞控制输入信号和广域异地多时滞控制输入信号两部分,建立了多时滞电力系统的模型。运用Lyapunov-Krasovskii泛函理论推导出了含有时滞分量的线性多时滞电力系统稳定判据,将控制问题转换为线性矩阵不等式的可行性问题,并采用模型降阶方法对原系统进行降阶,实现了含有多个时滞的广域输出反馈控制,并计算出了能够使闭环电力系统稳定的最大时滞时间。讨论了系统稳定判据中时滞分量与广域控制器参数之间的关系,以及对区域间振荡的控制效果。最后以两区域四机系统为例,用时域仿真的结果说明了本文所提出的多时滞控制方法的有效性。
The model of power system with multiple time delays is constructed for wide area measurement information with different transmission distances. The damping controller signals are divided into two parts：The first level of control is derived from local signals without time delays. The second level of control is supplied by a coordinator using global states with different multiple time delays. The delay fractioning based on Lyapunov-Krasovskii approach is used to derive a delay-dependent steady stability criterion, and the criteria of stability are formulated as feasibility problems of linear matrix inequality（LMI）. The model is reduced by the model reduction method. The time-delay output feedback control is realized for wide-area power system. Meanwhile, the maximum delay times is calculated. In addition, the relationship between the delay fractioning of the criteria and the damping controller is discussed. Finally, taking a two-area four-machine power system as an example, the results of simulation in time-domain show that performance of the proposed controller in this paper is effective.
出处
《电工技术学报》
EI
CSCD
北大核心
2014年第2期279-289,共11页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(61074042)
