PMU STUDIES

Screen Shot 2014-11-19 at 1.07.30 PMPhasor measurement unit (PMU) studies can be achieved using the GTNET or GTNETx2 card with our flexible PMU firmware.

PMUs can be an embedded function within relays or disturbance recorders, or alternatively they can be standalone products. RTDS simulations can include PMUs, allowing the PMU data to be used for the monitoring of oscillations, angle difference, system frequency, voltage stability and other parameters. Other ideas for PMU data include situational awareness, alarm and operational limit settings, state estimation and congestion management – to name just a few.

Generally, the PMU is simulated within RSCAD, and the C37.118 data streams are sent to physical phasor data concentrators (PDCs) or other control/protection equipment which are external to the simulator. This is accomplished using the PMU firmware option for the GTNETx2 card, which provides synchrophasor output data streams according to the IEEE C37.118 standard. Two PMU streaming options are available.

Using the first option, a single GTNET-PMU firmware installed on a GTNETx2 module can represent and provide output for up to 8 PMUs with symmetrical component information related to 3-phase sets of voltage and current using UDP or TCP connections. The reporting rate of each PMU can be set individually between 1 and 60 frames per second. Reporting rates as high as 240 frames per second are supported, but require the number of PMUs represented by one firmware to be a maximum of 8.

Using the second option, a single GTNET-PMU firmware can represent and provide output for up to 24 PMUs containing only positive sequence data. Frame rates up to the system frequency (50/60 Hz) are supported.

The GTNETx2 card has two modules which are capable of running two firmwares simultaneously. If two PMU firmwares are installed and run simultaneously on a GTNETx2 card, the above capabilities double.

The GTNET-PMU component output is synchronized to an external 1PPS, IRIG-B or IEEE 1588 signal via the GTSYNC card.

Download the PMU firmware product information sheet.

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