Predictive Compressor Room Control for Variable Air Demand

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Solution Overview

Problem

Existing compressor control systems operate based solely on the current state, lacking predictive capabilities, leading to suboptimal control and higher energy costs.

Innovation Solution

A method that estimates the current state of the compressed air or gas system, predicts future process variables, samples these predictions based on system volume, and uses model predictive control to generate action and state profiles over defined time horizons to optimize compressor operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If compressors are controlled based solely on current state, then control simplicity is maintained, but energy efficiency deteriorates

Engineering Contradiction:
Improvecontrol simplicityVSAvoidenergy efficiency
Core Design Contradiction:
Ease of operationVSUse of energy by moving object

Solution Approach 1:

The control system performs preliminary actions by predicting future compressed air consumption and proactively adjusting compressor operations before the actual demand occurs. The predictive controller estimates future states and pre-adjusts compressor output, avoiding reactive control that would cause inefficiencies. This resolves the contradiction by maintaining simple control implementation while dramatically improving energy efficiency through forward-looking decision-making.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by continuously monitoring actual compressed air consumption and comparing it with predicted consumption. The predictive controller uses this feedback to refine future predictions and adjust compressor operations in real-time. This closed-loop feedback mechanism enables the system to maintain control simplicity while achieving superior energy efficiency compared to open-loop control methods.

Inventive Principle:
Principle #23Feedback

2Use of energy by moving object

If predictive control is implemented, then energy efficiency improves, but system complexity increases

Engineering Contradiction:
Improveenergy efficiencyVSAvoidsystem complexity
Core Design Contradiction:
Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical control systems with a computational predictive control algorithm. Instead of using elaborate mechanical sensors, actuators, and control mechanisms, the system uses software-based prediction and optimization. This substitution maintains or improves energy efficiency while actually reducing overall system complexity by eliminating the need for complex hardware control architectures.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The predictive control system is designed to be self-sufficient, using historical data and system parameters to automatically generate control decisions without requiring complex external intervention or manual configuration. The system serves itself by continuously learning from past performance and autonomously optimizing compressor operations, thereby improving energy efficiency without proportionally increasing operational complexity.

Inventive Principle:
Principle #25Self-service

3Ease of manufacture

If compressors are switched on/off sequentially based on predefined pressure values, then control implementation is simple, but control optimality deteriorates

Engineering Contradiction:
Improvecontrol implementation simplicityVSAvoidcontrol optimality
Core Design Contradiction:
Ease of manufactureVSProductivity

Solution Approach 1:

The system changes the fundamental control parameter from simple pressure thresholds to predictive consumption forecasts. Instead of switching compressors based on fixed pressure setpoints, the predictive controller uses estimated future consumption patterns to determine optimal switching times. This parameter transformation maintains implementation simplicity while dramatically improving control optimality and overall system productivity.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The control system transitions from static, predefined pressure-based switching to dynamic, prediction-based decision-making. The predictive controller continuously adapts compressor switching decisions based on real-time system state and forecasted demand, enabling optimal control that responds to changing conditions while maintaining straightforward implementation through algorithmic decision rules.

Inventive Principle:
Principle #15Dynamics

Data Source

PatentEP3974918B1A method for controlling a compressor room and an apparatus thereof
Publication Date: 2024.01.17 ATLAS COPCO AIRPOWER NV
  • EP3974918B1 patent drawingFigure 1~2
  • EP3974918B1 patent drawingFigure 3~4
  • EP3974918B1 patent drawingFigure 5~6

AI summary

According to an embodiment, a computer-implemented method for controlling a compressed air or gas system (113) is disclosed comprising the steps of estimating (202) a current state, predicting (203) a future process variable profile (225) based on the current state (211), sampling (204) the future process variable profile by a sampling method having a sampling frequencies based on a volume (107) of the compressed air or gas system (113),transforming (205) by a model predictive control, MPC, method the sampled future process variable profile and the current state into an action profile and a state profile, and instructing the compressors to perform the actions in accordance with the action profile thereby controlling the compressed air or gas system (113) .