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状态观测器是解决变量不可测问题的有效手段,可用于不可测输入和不确定模型参数的在线估计。基于非线性微分-代数系统的动态模型,将不可测输入和不确定模型参数扩展为系统的状态变量,构造状态观测器对其进行在线观测,给出了满足一定条件下的不可测输入和不确定模型参数可观性的简化条件。以催化裂化装置提升管反应器为例进行分析和仿真,当不可测输入和不确定模型参数同时出现时,仅靠提升管出口一个温度测点将不能保证系统的可观性,需要增加温度测点,才能完成对整个系统不可测变量的观测。
State observer is an effective method to solve the problem of unpredictable variables. It can be used for online estimation of unmeasured input and uncertain model parameters. Based on the dynamic model of nonlinear differential-algebraic system, the unmeasured input and uncertain model parameters are extended to the state variables of the system. The state observer is used to observe it online, and the unobservable inputs and outputs that satisfy certain conditions are given. Simplified conditions for determining the observability of model parameters. Taking the riser reactor of catalytic cracking unit as an example, the analysis and simulation are carried out. When the unmeasured input and the uncertain model parameters appear at the same time, only one temperature measuring point at the exit of the riser can not guarantee the observability of the system. In order to complete the observation of the unviable variable of the whole system.