Hi all pls i am working on a topic detecting faults on HVDC system using travelling waves .I tried using discrete wavlet transform toolbox on matlab to decompose the signal to enable the location of the time of arrival of the wave.The issue is its been very difficult due to the transient and nature of dc current .Pls if there is any advice on how this can be done i would appreciate ?
Yes, detecting faults in HVDC systems using travelling waves and analysing them with wavelet transforms in MATLAB is a valid approach. However, you're right, the transient nature of DC faults can make it challenging. Here's why and some alternative techniques to consider:
Challenges with Discrete Wavelet Transform (DWT) for DC Faults:
- DWT is effective with sporadic or repetitive signals. DC faults in HVDC schemes are momentary, meaning they arise for a short duration and don't repeat periodically. This can make it difficult to isolate the travelling wave component using DWT.
Alternative Techniques for Fault Detection with Traveling Waves:
- Look for swift deviations in voltage or current at the converter stations. These swift changes specify the influx of the travelling wave caused by the fault.
- This method is simple but may not be accurate for high-resistance faults or noisy signals.
- While not perfect for momentary signals, it can detect the overriding frequencies existing in the travelling wave.
- Look for high-frequency apparatuses appearing subsequently at the fault that might not have been present earlier.
- This can help differentiate the travelling wave from the steady-state DC component.
- Badges
- Science topic
- Similar topics
- Computer Communications (Networks)
- Simulators