控制回路的网络传输周期是安全优先分布式控制系统的重要设计参数.为求取该参数,在对多回路安全优先分布式控制系统建模后,提出了基于控制性能和网络调度的协同设计方法,并给出该方法的形式化表达式.利用状态相对误差及李雅普诺夫等理论,建立该方法中回路性能的描述函数,推导出了指定稳定度约束下的最大允许传输间隔求取公式.最后的仿真实例证实,该方法不仅能保证网络的可调度性而且能保证回路具有指定的动态性能.
Net transmission period (NTP) is an important parameter of safety critical distributed control system (SCDCS). To obtain NTP, a co-design method between desired control performance and network real-time scheduling is presented with a formalization description based on model-building of multi-loop SCDCS. Meanwhile, a performance function for control loop is built, and a method for getting the maximum allowable transmission interval (MATI) under prescribed stability constraint is introduced by using relative error of state and the Lyapunov theory. Simulation validates the NTP design method. The results show that the method guarantees control network schedulability, and makes control loop have desired dynamic performance.