Event-time triggered slow time-varying industrial process dynamic scheduling method

doi:10.11949/0438-1157.20240784

Abstract

Abstract:

In process industries, the phenomenon of slow time-varying transitions is prevalent. Continuous changes in operating conditions will lead to shifts in the optimal operating conditions for production scheduling, rendering original decision schemes inapplicable. Therefore, in this paper, a dynamic scheduling method based on event-time triggering mechanism is proposed. First, the impact of slow time-varying parameters on long-term scheduling decisions is analyzed. A strategy is proposed to characterize equipment performance degradation through changes in operational variables, and a dynamic triggering function is constructed. The dynamic scheduling trigger conditions integrate event and time-triggered characteristics, incorporating time-varying constraints. Secondly, dynamic information of the production system is embedded in the scheduling process. A process transition model is established as a simplified expression of input-output dynamics, thereby reducing computational complexity. Finally, a dynamic scheduling framework of closed -loop rolling is used to update the scheduling model according to the real-time operating status. In the case study, the proposed method is validated using an industrial heat exchanger network. This method provides timely dynamic scheduling, demonstrates good economic performance, and offers a new solution for production scheduling problems considering slow time-varying operating conditions.

Key words: process system, dynamic scheduling, event-time triggered, rolling optimization, heat exchanger network

摘要：

流程工业中的慢时变现象普遍存在，持续变化的工况会导致生产调度的最优操作条件偏移，原有的决策方案不再适用。提出了一种基于事件-时间触发的动态调度方法。首先，分析了慢时变参数对长周期调度决策的影响，提出以操作变量的变化表征设备性能衰减的策略，并构建了动态触发函数，在动态调度的触发条件中融合了事件和时间触发的特点，设计了时变约束条件。其次，在调度过程中嵌入生产系统的动态信息，建立了过程过渡模型作为输入输出动力学的简化表达，从而降低了计算的复杂度。最后，采用闭环滚动的动态调度框架，依据实时的运行状态更新调度模型。在示例研究中，以工业换热网络为例验证了所提方法的有效性，该方法能提供及时的动态调度，表现出较好的经济性能，为考虑工况随时间缓慢迁移条件下的生产调度问题提供了新的解决方案。

关键词: 过程系统, 动态调度, 事件-时间触发, 滚动优化, 换热网络

CLC Number:

TB 114.1

Chao REN, Kai WANG, Jie HAN, Chunhua YANG. Event-time triggered slow time-varying industrial process dynamic scheduling method[J]. CIESC Journal, 2025, 76(1): 256-265.

任超, 王凯, 韩洁, 阳春华. 事件-时间触发的慢时变工业过程动态调度方法[J]. 化工学报, 2025, 76(1): 256-265.

Figures/Tables 11

Fig.1 Schematic diagram of slow time-varying process

Fig.2 Conventional scheduling decision framework considering dynamic information

Fig.3 Proposed framework for dynamic scheduling

Fig.4 Comparison of event-triggering mechanisms

Fig.5 Design principles of conservative trajectory

Fig.6 Selected heat exchange network structure

Table 1 Flow data of heat exchanger network

参数	热流		冷流
参数	H1	H2	C1	C2
质量流量/(kg·s^-1)	50	40	30	200
输入温度/K	423	443	323	353
目标出口温度/K	323	313	393	383
比热容/(J·kg^-1·K^-1)	4000	2500	1000	2500
黏度/(mPa·s)	0.25	1.2	1.2	2

Table 2 Comparison of three triggering mechanisms

触发机制	描述
EET	操作变量持续调节，直至到达边界值
HPET	融合时间触发与预设性能事件触发的方法
HDET	融合时间触发与动态事件触发的方法

Fig.7 Trend of manipulated variable changes under EET condition

Fig.8 Trend of manipulated variable changes under HPET and HDET conditions

Fig.9 Comparison of energy consumption under three triggering mechanisms

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