PV Arc Detection via Voltage Variation Analysis
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Solution Overview
Problem
Existing electric arc detection systems in photovoltaic installations are costly, complex, and inefficient, particularly in distinguishing between parallel and series arcs, and are not suitable for direct current operations.
Innovation Solution
A method and device that measure voltage variations over time at the terminals of photovoltaic modules to identify the nature and location of electric arcs, using stable voltage zones and voltage variation characteristics to differentiate between parallel and series arcs, with filtering and digital processing to enhance detection speed and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasonic detection, radiofrequency detection, or heat measurements are used to detect electric arcs, then detection capability is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts only the essential voltage variation characteristic from the complex arc signature, ignoring other features like acoustic, RF, or thermal signatures. This reduces the detection problem to monitoring voltage changes above a threshold, eliminating the need for complex processing systems while maintaining reliable arc detection.
Solution Approach 2:
The invention replaces expensive, complex detection equipment (ultrasonic sensors, RF detectors, infrared cameras) with simple voltage measurement circuitry that is already present in PV systems. This uses readily available, low-cost components to achieve arc detection without requiring specialized expensive equipment.
2Measurement precision
If high sampling rate processing is used to analyze complex arc signatures, then detection accuracy is improved, but processing time increases to seconds or minutes
Solution Approach 1:
The patent segments the arc detection problem into a simple voltage threshold comparison, separating the essential detection function from complex signature analysis. By focusing only on voltage variation magnitude and direction, the system achieves rapid detection without requiring high sampling rates or extensive processing time.
Solution Approach 2:
The invention skips the time-consuming steps of complex signature processing, interference discrimination, and mathematical analysis. It directly compares voltage variations against predefined thresholds to immediately identify arcs, rushing through the detection process in real-time without delays.
3Adaptability or versatility
If existing arc detection methods are applied to DC photovoltaic installations, then detection coverage is improved, but compatibility and reliability deteriorate due to different voltage variation characteristics
Solution Approach 1:
The patent adjusts the detection parameters specifically for DC PV systems, using voltage variation thresholds and comparison logic adapted to the unique characteristics of PV modules. The method accounts for the directionality of voltage changes in series versus parallel configurations, ensuring reliable detection in DC environments where AC-based methods fail.
Solution Approach 2:
The invention creates a universal detection method that works for both series and parallel arc configurations in PV systems. By monitoring voltage variation magnitude and direction at module terminals, the same basic approach reliably detects different arc types without requiring separate detection systems for different configurations.
4Measurement precision
If detailed voltage variation analysis is performed to distinguish series and parallel arcs, then location estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent exploits the asymmetric voltage response patterns of series versus parallel arcs. Series arcs produce voltage increases across multiple modules, while parallel arcs produce voltage decreases. This asymmetric behavior provides a simple binary distinction that enables accurate location estimation without complex analysis.
Solution Approach 2:
The invention uses only the essential voltage variation direction (increase or decrease) to distinguish arc types and locations, rather than performing exhaustive analysis of all voltage characteristics. This partial action approach achieves sufficient accuracy for safety purposes without the complexity of complete signature analysis.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables fast, reliable, and cost-effective detection of electric arcs in photovoltaic installations, capable of distinguishing between parallel and series arcs and estimating their location, suitable for both direct and alternating current systems.
Implementation Method 1
the consequence of such a phenomenon can, in the worst case scenario, trigger a fire... A parallel electric arc can in particular occur... A series electric arc can occur... measuring, at the terminals of each of the modules of each string, the evolution of the voltage over time, at least during the formation of an electric arc
Data Source
AI summary
A method estimating a series or parallel nature and a location of an arc in a photovoltaic device, operating under direct current, including N (N=1 or N>1) strings of photovoltaic modules, connected to a charge device having a capacitive behaviour for the modules, the method including: a) detecting, at terminals of each of the modules of each string, evolution of voltage over time, during formation of an electric arc; b) identifying the modules at the terminals of which a voltage variation occurs between a first zone with stable voltage and a second zone with stable voltage for a duration of at least 5 μs, which immediately follows the voltage variation, and identifying the sign of each voltage variation; c) estimating the series or parallel nature and the location of the arc in the photovoltaic device.