蒸煮锅内温差DMC-PID串级解耦控制

DMC-PID Cascade Decoupling Control of Temperature Difference in Displacement Digester

关键词:  置换蒸煮系统  温差控制  DMC-PID串级解耦  鲁棒性

Key Words:displacement digester  control of temperature difference  DMC-PID cascade decoupling  robust

摘要:在置换蒸煮制浆过程中,蒸煮锅内温差过大会产生不均匀蒸煮现象,影响最终的蒸煮质量。针对蒸煮锅顶层流量与底层流量存在强耦合关系、蒸煮锅内温差大时滞特点、温差控制要求实时性,设计了DMC-PID串级解耦控制系统，通过流量-温差串级控制系统来实现对温差的控制。通过Matlab仿真表明,DMC-PID串级解耦控制系统具有更好的动态性能和鲁棒性,其控制效果明显优于单回路控制系统。

Abstract:Too large temperature difference will cause uneven cooking in displacement digester, it would affect the quality of the pulp. Flow-temperature difference cascade decoupling controller was used to implement the control of temperature difference. Considering there is strong decoupling relationship between the top flow and the bottom flow, and the temperature difference has a character of time delaying, the control of the temperature difference is required to be time-varying, therefore the DMC-PID cascade decoupling control system was designed. The results of Matlab simulation showed that the control system had better dynamic performance and robust, the performance of DMC-PID cascade decoupling controller was better than the controlling performance of the simple loop.