基于模型计算的控制系统的分析和设计

The Analysis and Design of the Control System Based on the Model Calculation

分析两类基于模型计算的控制系统,系统分析和实践表明,基于模型计算测量值的控制系统将计算环节引入反馈回路,会造成系统开环总增益的变化,因此,影响系统稳定性,增大偏离度,使控制系统品质恶化,为此应将计算环节引入到设定通道。基于模型计算设定值的控制系统没有稳定性问题。还讨论了它们在工程设计和实施时的注意事项。

Two types of control system based on the model calculation are analyzed. The analysis of system and practice show that the open loop total amplification of the control system where the controlled variables are computed by the model will change because calculation module is introduced into the feedback loop, therefore system stability is influenced, the variability of control increases and the quality of control system will deteriorate. To make up this shortage, the approach is proposed that the output of calculation module is used as the set point so that system stability does not decline. Some attentions of project design and application are also discussed .