Compressor Switching Control for Stable Pressure With Lower Energy Use
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Solution Overview
Problem
Conventional compressor systems face inefficiencies in maintaining sufficient pressurized fluid supply while minimizing energy consumption, especially when dealing with fluctuating fluid withdrawal, due to limitations in pressure band regulation methods that do not adequately account for current energy demand and compressor performance variations.
Innovation Solution
A method for controlling a compressor system that involves pre-selecting and weighing switching alternatives based on optimization criteria to maintain a predefined overpressure, with variable switch-on and switch-off pressures adjusted according to current conditions, allowing for efficient adaptation to changing demands and reducing energy losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure band regulation is used to control compressor switching, then the pressurized fluid supply can be maintained at predefined pressure levels, but the energy consumption is not optimized and unnecessary compressor work is performed
Solution Approach 1:
The control method continuously monitors the current pressure in the pressurized fluid system and uses this feedback information to dynamically adjust switching decisions. The control device compares actual pressure values with target pressure values and modifies compressor switching accordingly, ensuring energy-optimal operation while maintaining reliable pressurized fluid supply.
Solution Approach 2:
The invention transitions from static pressure band regulation to dynamic pressure-based control. The switching alternatives are evaluated and selected based on real-time pressure conditions, allowing the system to adapt continuously to changing demands and minimize energy consumption while maintaining supply reliability.
2Productivity
If multiple compressors are operated simultaneously to cover high withdrawal rates, then sufficient pressurized fluid supply is ensured, but energy consumption increases due to running more compressors than necessary
Solution Approach 1:
The control method dynamically changes the operating parameters (switching decisions) of individual compressors based on real-time system pressure and withdrawal rate conditions. By evaluating switching alternatives and selecting the energy-optimal combination, the system ensures sufficient supply capacity while minimizing the number of compressors running, thus reducing energy losses.
Solution Approach 2:
The control system automatically evaluates the current operating state and makes optimal switching decisions without external intervention. The control device independently determines which compressors should be switched on or off based on energy optimization criteria, enabling the system to self-regulate and minimize energy consumption while maintaining required productivity.
3Productivity
If frequent switching operations are performed to adapt to fluctuating withdrawal rates, then the pressurized fluid supply is optimized, but the switching frequency increases causing additional energy consumption and wear
Solution Approach 1:
The control method evaluates switching alternatives in advance by calculating the energy impact of potential switching operations. By assessing the current pressure state and predicting future demands, the system makes proactive switching decisions that adapt to fluctuating withdrawal rates while minimizing unnecessary switching operations, thus reducing switching frequency and associated time losses.
4Ease of operation
If fixed pressure bands are assigned to individual compressors, then simple control is achieved, but the system cannot efficiently respond to fluctuating withdrawal rates and energy optimization is limited
Solution Approach 1:
The control device performs multiple functions: it monitors pressure, evaluates switching alternatives for multiple compressors, calculates energy impacts, and makes optimal switching decisions. This universal control approach replaces simple fixed pressure band assignment with an intelligent system that adapts to fluctuating withdrawal rates while maintaining ease of operation through automated decision-making.
Data Source
AI summary
A method for controlling a compressor system comprising a plurality of compressors, wherein the compressor system is intended to maintain a predefined excess pressure in a pressurized fluid system, wherein decisions are met at fixed or variable intervals as to switching operations for adapting the system to current conditions, wherein—in a pre-selecting step, switching alternatives are excluded from the plurality of combinatorially available switching alternatives, —in a main selecting step, remaining switching alternatives are weighed against one another while referring to one or more optimization criterion (criteria) and optimum switching alternatives are selected from among the given criteria, and—in a control step, the selected switching alternative is output for implementation in the compressor system.