Dynamic Control Input Amplification for Oscillation Damping
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Solution Overview
Problem
PID regulators in industrial control systems often experience oscillations due to inappropriate parameter settings or process changes, leading to wear and suboptimal control, which increases energy consumption and reduces service intervals.
Innovation Solution
A method that detects oscillations in control inputs to control units, amplifies the control input by a multiplication factor based on the detected oscillation level, using a decay ratio calculation to determine this factor, thereby minimizing oscillations and optimizing control performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If PID regulator parameters are set for responsive control, then control speed is improved, but oscillations increase causing wear and instability
Solution Approach 1:
The control system dynamically adjusts the amplification factor based on real-time oscillation detection. The system transitions from static PID parameters to dynamic parameter adjustment, where the amplification factor is modified according to the detected oscillation level, allowing the system to adapt its response characteristics during operation
Solution Approach 2:
The system implements feedback by detecting oscillations in the control signal and using this information to adjust the amplification factor. The oscillation detection mechanism provides feedback about system stability, which is then used to modify control parameters to eliminate harmful oscillations while maintaining responsive control
2Productivity
If control gain is increased to improve responsiveness, then control performance is improved, but oscillations and wear of control units increase
Solution Approach 1:
The system changes the amplification parameter dynamically based on oscillation detection. When oscillations are detected, the amplification factor is reduced to minimize wear on control units. This parameter adjustment maintains high control performance when appropriate while preventing harmful oscillations that cause wear
Solution Approach 2:
The system converts the harmful effect of oscillations into useful information for control optimization. By detecting oscillations and using this information to adjust the amplification factor, the system transforms the problem of oscillations into a mechanism for optimizing control performance and reducing wear simultaneously
3Reliability
If oscillation damping is increased to improve stability, then control stability is improved, but control responsiveness decreases
Solution Approach 1:
The system uses dynamic adjustment of the amplification factor to achieve both stability and responsiveness. Rather than using fixed damping, the system adapts the amplification in real-time based on oscillation detection, maintaining high responsiveness during normal operation while providing damping when oscillations occur
Data Source
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AI summary
This invention relates to a method of performing control of a closed loop control system controlled by a controller, wherein said controller delivers the control input to at least one control unit in said system e.g. a valve, said method comprises the steps of: - detecting the oscillation level in said control input to said control unit, - amplifying said control input by a multiplication factor based on said detected oscillation level. Thereby characteristics of the control unit are changed as oscillations are detected. Thereby oscillations are minimized, and e.g. the wear of the control units is reduced and an improved control is obtained.