Power Grid Control Device Hunting Suppression via Adaptive Time Constants
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Solution Overview
Problem
In power transmission and distribution systems, hunting occurs due to coordination failures among control devices, leading to uneven deterioration and increased operational costs, as the time constant of individual control devices is adjusted to suppress hunting, resulting in deviation and concentrated power loss.
Innovation Solution
A system control device with a hunting determination unit, time constant calculation unit, and time constant transmission unit that adjusts the time constants of control devices based on their deterioration progress to prevent hunting and maintain even system performance, by increasing the time constant of the most deteriorated devices and decreasing it for less deteriorated ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the time constant of individual control devices is increased to suppress hunting, then hunting is suppressed, but the state of control devices deviates and deterioration becomes concentrated on specific devices
Solution Approach 1:
The patent applies local quality by adjusting the time constant of each control device based on its individual characteristics (number of operations, power loss, deterioration degree). Instead of uniformly increasing time constants for all devices, the system selectively adjusts each device's time constant according to its local state, thereby suppressing hunting while preventing concentration of deterioration on specific devices.
Solution Approach 2:
The patent changes the time constant parameter of control devices dynamically based on their operational state. By monitoring the number of operations and power loss of each device, the system adjusts the time constant parameter to optimize both hunting suppression and uniformity of device conditions, preventing any single device from experiencing excessive wear.
2Reliability
If the time constant of control devices is adjusted repeatedly to suppress hunting, then hunting is suppressed, but the number of operations varies among devices leading to uneven deterioration
Solution Approach 1:
The patent implements feedback control by continuously monitoring the operational state of each control device (number of operations, power loss) and using this information to adjust time constants. This feedback mechanism ensures that hunting suppression actions are optimized to minimize unnecessary operations, thereby maintaining high operational efficiency while preventing uneven deterioration.
Solution Approach 2:
The patent applies dynamics by making the time constant adjustable and adaptive rather than fixed. The system dynamically modifies the time constant of each control device based on real-time operational conditions, allowing the system to respond to changing conditions while minimizing the number of operations required for hunting suppression and maintaining overall operational efficiency.
3Reliability
If the time constant of control devices is increased to suppress hunting, then hunting is suppressed, but power loss becomes concentrated on specific control devices
Solution Approach 1:
The patent applies local quality by considering the power loss characteristics of each individual control device when adjusting time constants. The system identifies devices with high power loss and adjusts their time constants differently from devices with low power loss, thereby suppressing hunting while distributing power loss more evenly across all devices and preventing concentration on specific units.
Data Source
AI summary
The present invention includes a hunting determination unit configured to determine whether hunting has occurred or not for each of control devices in a power transmission and distribution system based on a control history of the control devices, a time constant calculation unit configured to calculate an adjustment time constant in which a time constant of the control device having state information indicating a state of the control device, with a high significance level, is increased, when the hunting determination unit determines that the hunting has occurred in one or more of the control devices, and a time constant transmission unit configured to transmit the adjustment time constant to the control device.