The　remote　terminal　unit　(RTU)　is　the　main　measurement　terminal　in　power　grids,　but　its　measurements　lack　a　unified　timestamp,　has　low　update　frequency,　and　is　affected　by　uncertain　transmission　delays.　In　contrast,　the　phasor　measurement　unit　(PMU)　offers　high　synchronization　and　accuracy,　and　has　become　an　important　data　acquisition　device　in　modern　power　systems.　To　enable　coordinated　use　of　these　two　types　of　measurement　data,　this　paper　first　summarizes　the　sources　of　RTU　non-synchronous　measurements　and　analyzes　the　influence　of　non-synchronous　measurement　data　on　state　estimation　and　power　flow　calculation,　with　supporting　verification　results.　A　measurement　data　correlation　analysis　method　is　proposed　based　on　energy　interaction　operator.　The　method　applies　the　principle　of　maximum　correlation　among　synchronous　data　and　uses　the　accurate　data　from　PMU　to　align　RTU　measurements,　establishing　a　reference　timestamp　for　hybrid　measurement　systems.　Simulations　on　the　IEEE　39-node　grid　and　a　real　83-node　grid　in　Guangdong　province　show　that　the　proposed　method　can　effectively　correct　the　non-synchronous　measurement　data　and　improve　the　accuracy　of　state　estimation　and　power　flow　calculation.　©　2025　Power　System　Protection　and　Control　Press.　All　rights　reserved.