Feedback Controller Gain Parameter Multiplication for Startup Stability
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Solution Overview
Problem
Adaptive feedback controllers face challenges during startup due to large load disturbances, as a low gain may fail to address these issues properly, leading to slow performance or severe system failures, especially in applications where the system is shut down and restarted, causing environmental and system conditions to change.
Innovation Solution
A system and method that involves storing a gain parameter from a feedback controller, multiplying it when the controller restarts, and using the multiplied gain parameter during startup to improve speed, accuracy, and stability, before reverting to steady-state or adaptive gain settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low gain parameter is used during normal operation, then system stability is maintained, but startup performance deteriorates due to inability to address large load disturbances
Solution Approach 1:
The patent applies dynamics by making the gain parameter adaptive rather than fixed. The controller automatically adjusts the gain parameter based on operational state: using a first gain parameter during startup/transient conditions and a second gain parameter during steady-state operation. This dynamic adjustment allows the system to optimize performance for each operational phase, resolving the contradiction between startup speed and steady-state stability.
Solution Approach 2:
The patent directly implements parameter changes by modifying the gain parameter value based on system state. A gain scheduler or adaptive tuning mechanism changes the gain parameter from a higher value during startup to a lower value during normal operation. This parameter change enables the system to handle large load disturbances effectively during startup while maintaining stability during steady-state operation.
2Speed
If a high gain parameter is used during startup, then startup performance improves, but system stability deteriorates during normal operation
Solution Approach 1:
The system dynamically switches gain parameters based on operational phase. During startup, a higher gain parameter is applied to improve response speed and handle load disturbances. Once the system reaches steady-state, the gain parameter is reduced to maintain stability. This dynamic switching resolves the contradiction by applying different parameters at different times.
Solution Approach 2:
The patent applies preliminary action by preparing and applying an appropriate gain parameter before startup occurs. The gain scheduler pre-configures a higher gain parameter specifically for startup conditions, ensuring the system is ready to handle large load disturbances from the moment it begins operation, then transitions to a lower gain parameter once startup is complete.
3Adaptability or versatility
If the system is shut down and restarted frequently, then operational flexibility is improved, but performance deteriorates due to repeated adaptation to changing conditions
Solution Approach 1:
The patent applies preliminary action by detecting startup conditions in advance and automatically applying the appropriate gain parameter before the system begins normal operation. The gain scheduler monitors system state and identifies when a restart has occurred, then pre-configures the higher gain parameter to handle the anticipated large load disturbances. This eliminates performance deterioration by ensuring the system is properly configured for startup conditions from the beginning.
Solution Approach 2:
The system uses feedback mechanisms to detect operational state changes and automatically adjust gain parameters. The gain scheduler continuously monitors system behavior and identifies startup conditions through feedback signals, then responds by switching to the appropriate gain parameter. This feedback-driven approach maintains reliable performance during frequent restarts by ensuring the controller is always properly configured for current operating conditions.
Data Source
AI summary
A system for controlling start-up of a feedback controller includes a memory device and a processing circuit. The processing circuit is configured to receive a gain parameter from the feedback controller and to store the gain parameter in the memory device. The processing circuit is further configured to multiply the stored gain parameter and to cause the feedback controller to use the multiplied gain parameter in response to a determination that the feedback controller has restarted.