PMUphasor

PMUphasor is a term used to describe the data representation and processing workflow associated with synchrophasor measurements produced by Phasor Measurement Units (PMUs). In practice, PMUphasor data consists of time‑stamped phasor measurements of electrical quantities such as voltage and current, along with ancillary data including system frequency, rate of change of frequency (ROCOF), and quality flags. Time tags are synchronized to GPS time to enable precise cross‑device alignment and wide‑area monitoring.

The typical PMUphasor data model includes, for each sample, phasor values (magnitude and angle) for multiple channels, accompanying frequency and ROCOF values, status indicators, and a high‑precision time stamp. Data are commonly carried using standards and protocols associated with synchrophasor technology, notably IEEE C37.118 and its revisions, which define data frames, sample rates, and phasor notation. In practice, PMUphasor streams may be integrated into energy management systems, state estimation modules, and wide‑area monitoring applications.

Applications of PMUphasor data include real‑time grid monitoring, dynamic stability analysis, event detection, and protection and control schemes that rely on synchronized measurements across geographically dispersed locations. The high time resolution and synchronized phasors enable improved situational awareness, more accurate state estimation, and faster disturbance assessment.

Implementation considerations involve managing large data volumes, ensuring robust time synchronization, validating data quality, and integrating PMU data with existing infrastructure. Limitations include the need for reliable communications, handling missing or delayed samples, and ensuring interoperability across devices and vendors.