Pumping Station Driving Curve Switching for Fast Flowrate Control
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Solution Overview
Problem
Existing methods for automatically controlling pumping stations in fluid circulation systems, such as heating and cooling systems, take too long to adapt to flowrate variations, leading to suboptimal energy efficiency, especially during non-uniform operating conditions.
Innovation Solution
A method that predefines multiple driving curves for a pumping station, allowing for real-time adaptation by monitoring flowrate changes and dynamically switching between these curves based on stabilization times and control thresholds, ensuring immediate response to flowrate conditions while maintaining system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If statistical analysis methods are used to adapt the driving curve to system flowrate history, then energy saving is achieved during stable operation, but the correction time for operating modes becomes relatively long
Solution Approach 1:
The system dynamically switches between different driving curves based on real-time flowrate conditions detected by the control unit. Instead of using a fixed statistical analysis approach, the control method adapts the driving curve selection to current operating conditions, allowing immediate response to flowrate changes while optimizing energy consumption.
Solution Approach 2:
The control unit changes the parameter of the driving curve (head-flowrate relationship) based on detected flowrate conditions. By predefining multiple driving curves and selecting the appropriate one based on real-time monitoring, the system achieves rapid adaptation without the delays inherent in statistical analysis methods.
2Loss of energy
If the driving curve is modified based on statistical analysis of maximum and minimum flowrates, then energy performance improves, but the system requires long times to correct operating modes
Solution Approach 1:
The control unit continuously monitors the actual flowrate and compares it with the flowrate commanded by the control valve. Based on this feedback and the detected flowrate condition, the system selects the appropriate driving curve from predefined options, achieving rapid correction of operating modes while optimizing energy performance.
Solution Approach 2:
Multiple driving curves are predefined in advance, covering different operating conditions. This preliminary preparation allows the control unit to immediately select the most appropriate driving curve when flowrate conditions change, eliminating the need for time-consuming statistical analysis and rapid correction of operating modes.
3Ease of operation
If a single driving curve is used for pumping station operation, then the system is simple to operate, but energy consumption is not optimized during varying flowrate conditions
Solution Approach 1:
The single driving curve is segmented into multiple driving curves, each optimized for specific flowrate conditions. The control unit automatically selects the appropriate segment (driving curve) based on detected flowrate conditions, maintaining operational simplicity while optimizing energy consumption across varying operating conditions.
Data Source
AI summary
Method for automatically controlling a pumping station of a fluid circulation system with flowrate control valves, comprising the following control steps which are cyclically repeated: (b) driving said pumping station in accordance with a set curve belonging to a group of predefined driving curves; (c) monitoring over time the variation in flowrate of fluid circulating in the system at the pumping station, or a parameter related thereto; (d) if, during the monitoring step (c), the variation in flowrate exceeds or falls below a control threshold and if said condition is maintained for a stabilization time, (e) modifying the set driving curve, replacing it with another curve from the plurality of driving curves; and (f) reinitializing the monitoring step (c) from a new working point reached by the pumping station.