PMU+ is a licenced firmware module that enables synchrophasor streaming using IEEE C37.118.2 protocol.
When studying the performance of inverter-based power plants, it’s common to encounter voltage and current waveforms that are either chopped or heavily distorted. The PMU+ algorithm used can accurately determine the fundamental frequency phasor set despite all these distortions.
Most PMU devices need to be configured in either Class-P or Class-M mode. The PMU+ algorithm simultaneously meets both Class-P and Class-M requirements, eliminating the need to configure for Class-M’s accuracy and Class-P’s speed. This is particularly useful when analysing grid stability events that contain very small amplitude information at higher frequencies (~20Hz), where both speed and accuracy are required.
Synchrophasor data is recorded offline and is available for download as part of the existing data streams – without the use of the C37.118.2 streaming protocol. This means that synchrophasor data can be collected throughout the network – without having to rely on expensive broadband communication infrastructure required by the C37.118.2 protocol.
The PMU+ module allows synchrophasor data to be combined with Power Quality event data, providing an additional data stream with powerful diagnostic capabilities.
The suite of diagnostic data now contains the following:
Synchrophasor streaming protocol enables device integration into existing wide area monitoring (WAM) networks.
The PMU+ module retains a long pre-event buffer, which enables detailed analysis of the build-up to & the impact of complex Power Quality (PQ) events. Users can specify the duration of long pre- and post-event synchrophasor data recording, spanning tens of minutes, as part of the PMU+ module set-up process.
Synchrophasor data is accessible via the Modbus protocol interface. This simplifies the integration of the devices as part of plant control strategies.
The update rate of synchrophasor data via Modbus is once per cycle. This high update rate is required by most plant controllers.
