I suggest you follow https://d1wqtxts1xzle7.cloudfront.net/45103548/signal_bollen.pdf?1461684244=&response-content-disposition=inline%3B+filename%3DSIGNAL_PROCESSING_OF_POWER_QUALITY_DISTU.pdf&Expires=1596714819&Signature=BDLXlDa8tSecnpfwV7UwVkj3VWRPESf-moFtfEUYFFMrxocN~pIekJHsFtimM1K35hl34PjAnR9u1gFZp-ZaSKfLkBogBt8FpQb~6rcrHvGBbX0sQMJOeebKI9DC6d6u4NQEvbAedGNZer4ntQDRuB4GQAcIGqPY~bZT9ws1hvOwjtsomlv1KVhL9WMAV55BvLtt70fJJUB-Escr-cRwZhtx9eT8wXHWks69zkq3vEITxrgG8Ngi9lxjgWhOwf0vIzCQSnSjfeVeysaAjAe-9GIJ3E0MYicd4mca967-tOHuq1DC0o-DtKfGAbw7eUTfKSXaUbIKV9JmyTvOqy5k3g__&Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA
Hello Irfan Ali Channa, you can go through the paper titled "Feature Extraction and Power Quality Disturbances Classification Using Smart Meters Signals" in the following link: