网络控制系统与网络化串级控制系统的统一建模

Uniform Modeling of Networked Control Systems and Networked Cascade Control Systems

基于智能化的现场设备提出广义对象和广义控制器的概念,广义对象包括被控对象、传感器以及发送传感信息的网络,广义控制器包括控制器以及发送控制信息的网络。执行器和被控对象直接连接,直接接收广义控制器的控制指令,广义控制器直接接收广义对象发送过来的传感信息。不同结构形式的网络控制系统和网络化串级控制系统都可看作是广义对象、广义控制器和执行器的组合。同时考虑了网络诱导时延和数据包丢失,采用增广状态向量法在离散时间域分别建立了它们的统一模型,为系统进一步的分析和综合奠定了坚实的基础。

Based on intelligent field devices,the concepts of generalized plant and generalized controller were proposed.A generalized plant included a controlled plant,a transmitter,as well as a network which sent out sensor data.A generalized controller consists of a controller and a network which sent out control data.The actuator was connected directly with the generalized plant,and it received the control command from the generalized controller,which collected the latest sensor data from the generalized plant.In that way,different configurations of networked control systems and networked cascade control systems could be viewed as a combination of generalized plants,generalized controllers and actuators.The uniform models of them were developed,respectively,took into account the networked induced delay and data packet dropout.It lays a solid foundation for the further analysis and synthesis of the systems.