OpenPMU is primarily an academic project so most resources are in the form of academic publications.  The web pages below are intended to give a brief overview of OpenPMU technologies; please refer to the publications for depth.

What's a Synchrophasor?
If you're asking that question, you'll probably find our 'PMU Fundamentals' page of use to you.  It'll explain the basics of PMU technology, which you will need to understand to benefit from the rest of these resources.

OpenPMU Device
This section describes the OpenPMU resources which are used to construct a fully functional and operational PMU device.  Since OpenPMU V2, our system is built on a modular design, described on the linked page.  If you are unfamiliar with the modular design, and inter-module communication, it is highly advisable that you read that web page and the paper listed there.

Data Acquisition
The Data Acquisition module performs the sampling of voltage and current waveforms. It is disciplined to UTC (via GPS / GNSS).  Sampled values are provided in XML datagrams.

Details of the data acquisition module are found here.

Phasor Estimation
The Phasor Estimation module accepts as sampled values as an input, applied a phasor estimation algorithm, and then outputs the phasor parameters.

Details of the phasor estimation module are found here.

The Telecoms module handles communication from the PMU to applications requiring synchrophasors.  OpenPMU supports IEEE C37.118.2, IEC 61850-90-5, and has demonstrated cyber secure implementations.

(Note, inter-module communication is described here.)

OpenPMU Compliance Test

The OpenPMU project has developed a methodology for testing the compliance of PMU devices against the requirements of the IEEE C37.118.1 standard.  The method may be applied using a standard relay test set, and does not require that the test set be synchronised to a time signal.  This method is not intended as a substitute for full PMU compliance testing in a professional laboratory, but is a useful tool for investigating the dynamic behaviour of PMUs which may be applied by universities and industry.

Details of the OpenPMU pre-compliance test are found here.

Case Studies

Obsolete and Legacy Stuff

OpenPMU V1 is no longer supported as of December 2017. For historical interest only: Information for OpenPMU V1 (Legacy).