System Control Device Integral Term Reset for Voltage Overshoot Prevention
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Solution Overview
Problem
System control devices with both feedback control and self-protection functions experience a significant discrepancy between target and actual control values during self-protection periods, leading to excessive integral terms and subsequent overshoots in voltage or current when control is resumed.
Innovation Solution
Incorporating a system control device with semiconductor elements, actual control value acquisition, deviation computation, integral term computation, and control command value decrease mechanisms to compute a first control command value using the pre-start integral term after self-protection, thereby preventing overshoots by adjusting the control command value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control is exercised during self-protection period, then the integral term accumulates excessive value due to large deviation between target and actual control values, but this causes overshoot in control command value when control is resumed
Solution Approach 1:
The patent applies preliminary action by detecting the start of self-protection period in advance and clearing the integral term before excessive accumulation occurs. The control device monitors protection flags and proactively resets the integral component of the control command value, preventing the buildup of erroneous deviation data that would cause overshoot when normal control resumes.
Solution Approach 2:
The patent uses feedback mechanisms by continuously monitoring the control state through protection flags and comparing actual control values with target values. The system detects when self-protection is active and adjusts the integral term computation accordingly, creating a closed-loop control that prevents excessive integral accumulation during protected states.
2Object-affected harmful factors
If the control device stops operation during self-protection, then the device is protected from damage, but the deviation between target and actual control values increases causing excessive integral term
Solution Approach 1:
The patent extracts the problematic integral term component from the control command during self-protection periods. By separating and clearing only the integral term while maintaining proportional control, the system removes the source of excessive accumulation without completely halting control operations, thus protecting the device while preserving necessary control functionality.
Solution Approach 2:
The patent changes the parameter state of the integral term by clearing or resetting it during self-protection periods. This parameter modification prevents the integral term from accumulating excessive values during protected states, while allowing the system to resume normal control operations without overshoot once protection is lifted.
3Productivity
If the integral term is not cleared during self-protection, then continuous control computation is maintained, but the control command value becomes excessive when control resumes causing voltage or current overshoot
Solution Approach 1:
The patent applies preliminary action by detecting and clearing the integral term at the onset of self-protection periods. This proactive reset prevents the integral accumulation that would otherwise occur during protected states, eliminating the root cause of subsequent overshoot while allowing control computations to continue uninterrupted.
Solution Approach 2:
The patent implements preliminary anti-action by preemptively clearing the integral term before excessive accumulation can harm the system. This counter-measure neutralizes the potential harmful effect of integral buildup during self-protection, preventing the generation of excessive control commands when normal operation resumes.
Data Source
AI summary
A system control device includes a protective control section for providing protective control while allowing a first control command value computation section to perform computations during a period during which a first feedback control section exercises control; a control command value decrease section; a termination time acquisition section for acquiring the information about the termination time for the protective control; and a termination control section which uses a control command value decreased by the control command value decrease section as the initial control command value after the termination time.