Hi Erickson,
Regarding to thesis topics, try to check what are the existing studies
related to arc flash studies and renewable energy. Then, consider those references where you can start or continue those existing studies by solving another problem related to those topics.
Sample, As define with this note -> "Arc Flash notes("")":http://www2.schneider-electric.com/documents/support/white-papers/electric-utilities/arc-flash-mitigation-r0-db.pdf
"Arc flash events can result from inadvertent contact with .....energized parts.. contamination...equipment failure ...etc."
*"Inadvertent contact with energized parts"*- we can consider this a simple problem but if you will have a study on its resolution, then you find a research topic already, considering all possible circumstances but don't forget to set a limitation.
Hope it helps.
Best,
Neil