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arXiv 2109.13832eess.SYcs.SY
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切换系统无限网络抽象的合成构造

Compositional Construction of Abstractions for Infinite Networks of Switched Systems

Maryam Sharifi, Abdalla Swikir, Navid Noroozi, Majid Zamani

摘要:

我们为无限多个离散时间切换系统的互连构造了组合连续逼近。近似(称为抽象)本身是一个连续空间系统,它可以在控制器设计过程中用作原始(称为具体)系统的替代。在对抽象系统进行控制器综合后,将控制器细化为具体系统的更详细的控制器。为了量化近似的输出轨迹和原始系统的输出轨迹之间的不匹配,我们使用所谓的模拟函数的概念。具体地,具体网络中的每个子系统和抽象网络中的对应子系统通过局部仿真函数相关联。我们表明,如果本地仿真功能满足一定的小增益型条件开发的无限多个子系统的网络,然后聚合的个别仿真功能提供了一个整体的抽象和具体的网络之间的整体仿真功能。对于线性切换系统的网络,我们系统地构造局部抽象和局部仿真函数,其中所需的条件表示在线性矩阵不等式,可以有效地计算。我们说明了我们的方法的有效性,通过应用程序的开关(即时变)拓扑结构的电网频率控制。

英文摘要:

We construct compositional continuous approximations for an interconnection of infinitely many discrete-time switched systems. An approximation (known as abstraction) is itself a continuous-space system, which can be used as a replacement of the original (known as concrete) system in a controller design process. Having synthesized a controller for the abstract system, the controller is refined to a more detailed controller for the concrete system. To quantify the mismatch between the output trajectory of the approximation and of that the original system, we use the notion of so-called simulation functions. In particular, each subsystem in the concrete network and its corresponding one in the abstract network is related through a local simulation function. We show that if the local simulation functions satisfy a certain small-gain type condition developed for a network of infinitely many subsystems, then the aggregation of the individual simulation functions provides an overall simulation function between the overall abstraction and the concrete network. For a network of linear switched systems, we systematically construct local abstractions and local simulation functions, where the required conditions are expressed in terms of linear matrix inequalities and can be efficiently computed. We illustrate the effectiveness of our approach through an application to frequency control in a power gird with a switched (i.e. time-varying) topology.

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