Isolated Operation Detection via Power Fluctuation Patterns
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Solution Overview
Problem
Current isolated operation detection methods for distributed power supplies are slow and prone to unnecessary operation, failing to accurately distinguish between system cycle changes caused by resistance/inductance components and actual isolated operations, leading to misdetected isolated operations.
Innovation Solution
A method that injects power fluctuations into the system, measures and adjusts the system cycle, and determines isolated operation based on a change pattern formed by deviations from previous cycles, using threshold values to differentiate between isolated and unnecessary operations, enabling high-speed detection without misoperation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power fluctuation systems are used for isolated operation detection, then detection capability is provided, but isolated operation detecting time becomes 0.5 to 1.0 seconds which is too slow
Solution Approach 1:
The invention uses periodic power fluctuations (reactive power fluctuations) injected into the system at regular intervals. By measuring the system cycle changes in response to these periodic fluctuations, the detection speed is dramatically improved from 0.5-1.0 seconds to 0.01-0.1 seconds, while maintaining reliable isolated operation detection capability
Solution Approach 2:
The invention implements a feedback mechanism where the measured system cycle is compared against expected values, and the isolated operation determination is made based on the deviation pattern. This feedback approach enables high-speed detection by continuously monitoring and responding to system cycle changes in real-time
2Speed
If high-speed detection is implemented, then detection speed increases, but unnecessary operation (misdetection) increases due to inability to distinguish system cycle changes from actual isolated operations
Solution Approach 1:
The invention applies different analysis methods to different aspects of the signal: periodic power fluctuations are used for high-speed detection, while the pattern of system cycle deviations is analyzed for accuracy. By combining these localized approaches, the system achieves both high speed and high reliability without misdetection
Solution Approach 2:
The invention dynamically adjusts the detection criteria based on the observed system cycle deviations. By monitoring the pattern of deviations over multiple cycles and comparing against threshold values, the system can distinguish between normal variations and actual isolated operations, maintaining high detection accuracy at high speed
Data Source
AI summary
An isolated operation detecting method according to the present invention includes: a first step that injects a power fluctuation into the power system; a second step that measures a system cycle; a third step that adjusts the injection of the power fluctuation so that the system cycle increases when the system cycle is found increased than the previous system cycle as a result of the measuring, and decreases when the system cycle is found decreased than the previous system cycle; a fourth step that produces a change pattern of a latest system cycle on the basis of a deviation of the latest system cycle from a fixed number of cycle-passed previous system cycle; and a fifth step that determines an isolated operation on the basis of the change pattern.