Correlation analysis is a statistical method that can identify correlation patterns between different monitoring points and multisource heterogeneous monitoring data from power quality monitoring datasets.This method uncovers the inherent operational characteristics of the power grid

making it widely applicable in the field of power quality.First

this paper provides a detailed analysis of the correlation analysis method.Next

it summarizes three main application scenarios of this method in power quality：disturbance identification

disturbance source tracing

and comprehensive assessment .Finally

the paper discusses the applicable conditions for correlation analysis in power quality and presents prospects for its future applications in this field.