Pv String Fault Detection
ID U-5686
Category Hardware, Circuits, & Sensors
Subcategory Signal Processing
Researchers
Brief Summary
Method for the detection of ground faults in PV strings using spread spectrum time domain reflectometry.
Problem Statement
Ground faults and other wiring issues that compromise optimal panel performance are common, but often remain undetected posing safety and fire risks. Most methods for detecting ground faults require time-consuming voltage and current measurements, as well as visual assessment of solar panel integrity.
Technology Description
U of U researchers have developed a novel spread spectrum time domain reflectometry (SSTDR) method for the detection of photovoltaic (PV) string faults. This SSTDR method compares autocorrelation differences generated by the PV string before and after detection of the fault. It does not require current or voltage measurements, saves time, and prevents malfunctions caused by undetected string faults.
Stage of Development
Benchtop Prototype
Benefit
- Locates ground faults in any size PV string.
- Operates successfully in or out of sunlight.
- Eliminates need for current or voltage measurement.
- Decreases maintenance time and cost.
Publications
Roy, S., Alam, M. K., Khan, F., Johnson, J., & Flicker, J. (2018). An irradiance-independent, robust ground-fault detection scheme for PV arrays based on spread spectrum time-domain reflectometry (SSTDR). IEEE Transactions on Power Electronics, 33(8), 7046-7057. doi: 10.1109/tpel.2017.2755592
IP
Publication Number: US-2015-0236643-A1
Patent Title: Systems and Methods for Fault Detection
Jurisdiction/Country: United States
Application Type: Non-Provisional
Contact Info
Dean Gallagher
(801) 585-0396
dean.gallagher@utah.edu
