Event-Triggered Approach to Control of Nonlinear Systems

非线性系统控制的事件触发方法

• 批准号: RGPIN-2018-03722
• 负责人: Marquez, Horacio
• 金额: $ 4.01万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=712522
• 关键词: Event; Triggered; Approach; Control; Nonlinear

Control systems are typically implemented using a digital computer. In classical control, periodic control (i.e. sampling at regular intervals) is typically used. Recent research has raised important questions regarding the efficiency of periodic sampling in comparison with aperiodic solutions. Event-triggered systems have emerged as an attractive alternative to periodic sampling. In an event-driven system, information is exchanged between system components only when changes in the measured signals justify computing a new control action. The primary advantage of event-triggering over periodic sampling is better resource utilization by significantly reducing the rate of transfer of information between subsystems. This characteristic of event-triggered systems makes then particularly attractive in the context of Networked Control Systems (NCSs) in which the control loops are closed through a real-time (shared) network, thus limiting the amount of information that can be transmitted in real-time between system components. A second problem caused by the insertion of computer networks in control is the possibility of cyber threats which may include insider intentional threats and malicious actors. Today's threat landscape is, in fact, increasing at an alarming pace, and there is an increased urgency in protecting NCSs against cyber attacks. The long term objective of this research is to develop the foundations of a theory of control that can provide reliably solutions to the control of complex systems connected over a communication network. In such a theory: (i) Communication networks will be integrated seamlessly allowing communication between system components without risks (ii) Network congestion problems, delays, and packet dropouts will have minimal effect on system performance. (iii) Control systems will have integrity, i.e. will be able to detect cyber attacks and remain operational. Our approach consists of employing efficient solutions based on event-triggered control. Event-triggered control is in its infancy and much work is still required. We will focus on the solution of classical control problems with focus of robust solutions that can operate in the presence of modelling errors, and network effects (transmission delays, limited bandwidth, packet-dropouts), a problem that remains largely unsolved. We will also focus on secure control of nonlinear systems. Our research is aimed at exploiting the compatibility of measurements with the underlying physical process and control mechanism with the goal of providing protection against cyber attacks.

控制系统通常使用数字计算机来实现。在经典控制中，通常使用周期性控制（即以规则间隔采样）。最近的研究提出了重要的问题，定期采样的效率相比，非周期性的解决方案。事件触发系统已经成为周期性采样的一个有吸引力的替代方案。 在事件驱动的系统中，只有当测量信号的变化证明计算新的控制动作是合理的时，才在系统组件之间交换信息。事件触发相对于周期性采样的主要优点是通过显著降低子系统之间的信息传输速率来更好地利用资源。事件触发系统的这种特性使得在网络控制系统（NCS）的背景下特别有吸引力，在网络控制系统（NCS）中，控制回路通过实时（共享）网络闭合，从而限制了可以在系统组件之间实时传输的信息量。由控制计算机网络的插入引起的第二个问题是网络威胁的可能性，其可能包括内部故意威胁和恶意行为者。事实上，当今的威胁形势正以惊人的速度增长，保护NCS免受网络攻击的紧迫性也越来越大。 这项研究的长期目标是发展控制理论的基础，可以提供可靠的解决方案，通过通信网络连接的复杂系统的控制。在这样一种理论中：（i）通信网络将无缝集成，允许系统组件之间无风险地通信。（ii）网络拥塞问题、延迟和数据包丢失将对系统性能产生最小影响。(iii)控制系统将具有完整性，即能够检测网络攻击并保持运行。 我们的方法包括采用有效的解决方案，基于事件触发控制。事件触发控制还处于起步阶段，仍有许多工作要做。我们将专注于经典控制问题的解决方案，重点是鲁棒的解决方案，可以在存在建模错误和网络效应（传输延迟，有限的带宽，数据包丢失）的情况下运行，这是一个很大程度上仍未解决的问题。 我们还将专注于非线性系统的安全控制。我们的研究旨在利用测量与底层物理过程和控制机制的兼容性，以提供针对网络攻击的保护。