Equipment Service Flags for MPC Variable Propagation
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Solution Overview
Problem
Current model predictive control and estimation technologies require custom coding and maintenance to manage changes in processing equipment modes, leading to inefficiencies and increased costs due to the lack of flexibility in handling intermediate process output variables during equipment status changes.
Innovation Solution
A system and method using equipment service flags to adjust the effect of individual or groups of variables on the process model, allowing for structured management of equipment service conditions, including setting flags, adjusting model structures, and resetting them to propagate variables, which enables flexible handling of equipment mode changes without deactivating control and estimation applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If custom coding and multiple model maintenance are used to manage equipment mode changes, then the control and estimation applications can handle equipment status changes, but the system complexity and maintenance costs increase significantly
Solution Approach 1:
The patent introduces equipment service flags as parameters that can be set to indicate different equipment modes (in-service, out-of-service, maintenance). These flags modify the behavior of the process model without requiring custom coding or multiple models. The system dynamically adjusts variable propagation based on flag states, allowing flexible handling of equipment mode changes through parameter modification rather than structural changes.
Solution Approach 2:
The equipment service flag mechanism serves multiple functions: it tracks equipment status, controls variable propagation, manages model behavior, and provides a standardized interface for handling different equipment modes. This universal approach replaces the need for custom-coded solutions and multiple specialized models, reducing system complexity while maintaining adaptability.
2Reliability
If the control and estimation applications are deactivated to handle equipment mode changes, then the system can manage equipment status changes, but the productivity and response time decrease
Solution Approach 1:
The system pre-defines equipment service flags and their associated behaviors before equipment mode changes occur. When equipment status changes, the corresponding flag is set, and the system automatically adjusts variable propagation and model behavior according to pre-configured rules. This eliminates the need to deactivate applications during mode changes, maintaining continuous operation and productivity.
Solution Approach 2:
The equipment service flag system dynamically adjusts the process model behavior in real-time based on equipment status. Instead of deactivating applications, the system continuously operates with modified parameter settings that reflect current equipment modes. This dynamic adaptation allows seamless handling of mode changes without interruption to control and estimation functions.
3Device complexity
If standard model predictive control technologies are used without equipment service flags, then the system structure remains simple, but the ability to handle intermediate process output variables during equipment status changes is insufficient
Solution Approach 1:
The equipment service flag acts as an intermediary between equipment status and model behavior. Rather than directly modifying complex model structures or adding specialized handling code, the flag serves as a simple mediator that triggers predefined behavioral changes in variable propagation. This maintains model structure simplicity while enabling sophisticated handling of intermediate POV variables during equipment status changes.
Data Source
AI summary
It is advantageous to handle certain conditions when equipment (or equipment components) is taken out-of-service or shutdown for service or maintenance. Equipment service flags may be used to indicate that an individual variable will no longer be propagated as the associated equipment has been taken out of line for service. When multiple variables feed another system or component downstream, those variables may be placed in an equipment service set and that set may be associated with an indicator that indicates that the group of variables in the equipment service set is unavailable. A visual indicator as to which variables have been made unavailable for propagation may be displayed to a user. Once the equipment or system is brought back online or is taken out of equipment service mode, the appropriate flags and equipment service set are reset and associated variables are once again propagated downstream.