Dynamic Threshold Detection for Power Line Loss
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Solution Overview
Problem
Existing systems for detecting loss of parallel transmission lines in electric power transmission systems rely on static and preset thresholds, which can lead to false tripping, slow response times, and inadequate transient stability, especially when power flow changes dynamically.
Innovation Solution
A system that monitors positive sequence voltage angle differences and current magnitudes between buses, using dynamically adjustable thresholds based on the rate of change of angle difference or power flow, and arming logic to accurately detect open line conditions without relying on fixed thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If static and preset thresholds are used for detecting loss of parallel transmission lines, then the detection system is simple to implement, but false tripping occurs and response time is slow
Solution Approach 1:
The patent implements dynamically adjustable thresholds that adapt to changing power flow conditions in real-time. The threshold value is no longer fixed but varies based on system state, allowing the detection system to maintain high accuracy across different operating conditions while avoiding false tripping. This dynamic adaptation resolves the contradiction by making the system responsive without excessive complexity.
Solution Approach 2:
The patent changes the detection parameter from a static threshold to a dynamic threshold that is adjusted based on power flow conditions. By modifying the threshold parameter adaptively, the system achieves higher detection accuracy and reliability while maintaining reasonable complexity through algorithmic adjustment rather than hardware complexity.
2Device complexity
If static and preset thresholds are used for detecting loss of parallel transmission lines, then the detection system is simple to implement, but response time is slow
Solution Approach 1:
The dynamically adjustable threshold allows the system to respond quickly to actual line losses by adapting to current power flow conditions. When a line loss occurs, the dynamic threshold can be adjusted to detect the change immediately, reducing response time compared to static thresholds that may not be sensitive enough under varying conditions.
3Reliability
If dynamically adjustable thresholds are used based on rate of change of angle difference or power flow, then detection accuracy and reliability are improved, but device complexity increases
Solution Approach 1:
The patent adjusts the threshold parameter dynamically based on measurable system parameters such as power flow and angle difference rate of change. This approach improves detection accuracy by adapting to actual system conditions while keeping the implementation complexity manageable through the use of standard measurements and computational algorithms.
Solution Approach 2:
The system uses feedback from real-time measurements of power flow and angle differences to continuously adjust the detection threshold. This feedback mechanism improves reliability by ensuring the threshold remains appropriate under varying conditions, while the complexity is managed through the use of readily available measurement data from the power system.
4Reliability
If dynamically adjustable thresholds are used, then false tripping is avoided and transient stability is maintained, but the system requires more complex processing
Solution Approach 1:
The dynamic threshold adjustment based on power flow conditions allows the system to maintain transient stability by adapting to changing system states. The processing complexity is managed by using standard power system measurements and well-established computational methods to calculate and adjust the threshold in real-time.
Data Source
AI summary
The present application discloses systems and methods to determine loss of at least one electric power transmission line in an electric power transmission system. In various embodiments, a system consistent with the present disclosure may include an electrical parameter monitoring subsystem configured to receive electrical parameter measurements and to determine a change of the electrical measurements. An analysis subsystem may determine whether a change in the electrical measurements is indicative of loss of at least one transmission line and may calculate a number of transmission lines lost based on the change. In some embodiments, a remedial action subsystem may be configured to implement a remedial action in response to loss of at least one transmission line. The number of transmission lines lost may be determined based on an angle difference ratio and a power ratio between two buses in electrical transmission system.