Energy Storage Arc Detection Using Frequency-Domain Amplitude
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Solution Overview
Problem
Conventional arc detection methods in energy storage systems rely on current and voltage values, which are insufficient for accurate detection of arc faults, leading to potential safety hazards due to delayed or inaccurate identification of arcs.
Innovation Solution
An arc detection method that involves obtaining electrical signals at electrical connection points in an energy storage system, determining the frequency domain amplitude based on these signals, and triggering an arc extinguishing and protection operation when the amplitude exceeds a preset threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional arc detection methods using current and voltage values are employed, then the detection system is simple to implement, but the detection accuracy is insufficient leading to delayed arc fault identification
Solution Approach 1:
The patent transforms the detection parameter from time-domain current and voltage values to frequency-domain amplitude characteristics. By performing Fourier transform on the electrical signals and analyzing the amplitude at different frequencies, the system can identify arc faults through characteristic frequency components, significantly improving detection accuracy while maintaining reasonable system complexity
Solution Approach 2:
The patent replaces the conventional threshold-based detection mechanism with a spectral analysis mechanism. Instead of comparing current/voltage against fixed thresholds, the system uses frequency domain transformation and amplitude comparison, substituting a more sophisticated analytical approach that provides better discrimination between normal operation and arc fault conditions
2Reliability
If frequency domain amplitude detection is used, then arc detection accuracy and response speed are improved, but the processing complexity of electrical signals increases
Solution Approach 1:
The patent performs Fourier transform processing on the electrical signals in real-time to obtain frequency domain amplitudes before comparison with threshold values. This preliminary transformation prepares the data in a form that makes arc fault detection more reliable by revealing characteristic frequency components that are not apparent in the time domain
Solution Approach 2:
The patent introduces frequency domain amplitude as an intermediary parameter between the raw electrical signals and the final arc fault determination. This intermediary representation simplifies the detection logic by converting complex signal patterns into comparable amplitude values at specific frequencies, making the system more reliable without excessive complexity
3Productivity
If arc detection is delayed due to insufficient sensitivity, then the detection system operates stably with fewer false alarms, but safety hazards may occur due to delayed response
Solution Approach 1:
The patent changes the detection parameter to frequency domain amplitude, which exhibits characteristic patterns during arc faults. This parameter transformation enables faster and more sensitive detection of arc conditions, improving response speed and reducing safety hazards by identifying arcs at their inception rather than waiting for current/voltage thresholds to be exceeded
Solution Approach 2:
The patent establishes a feedback mechanism where the frequency domain amplitude is continuously monitored and compared against threshold values. When the amplitude exceeds the threshold, the system immediately triggers protection actions, creating a rapid feedback loop that responds to arc conditions faster than conventional methods, thereby reducing safety hazards
Data Source
AI summary
Embodiments of this application disclose an arc detection method for performing protection in an energy storage system, and a related apparatus, to improve accuracy of arc detection in an energy storage system, promptly take an arc extinguishing measure, and reduce a probability of causing a safety hazard. The method in the embodiments of this application includes: A control apparatus obtains an electrical signal at an electrical connection point in an energy storage system. The control apparatus determines a frequency domain amplitude based on a frequency domain characteristic of the electrical signal. When the frequency domain amplitude is greater than a preset amplitude, the control apparatus controls the energy storage system to perform an arc extinguishing and protection operation on the electrical connection point.