PMU BrEst – PMU Browser and Estimator System
What is it for?
- Continuous monitoring of the MV distribution network operating state based on synchrophasor measurements from PMU (Phasor Measurement Unit) devices.
- Steady-state estimation of circular active and reactive power flows arising after closing normally-opened disconnectors in the network.
- Assessment of feeder loop-closing feasibility during network reconfiguration (e.g. during faulted section isolation).
- Automatic correction of MV phase rotation errors (phase reversal) and LV phase sequence/position errors with respect to a user-selected reference PMU.
- Clear visualisation of results via a secured web portal with authenticated access.
How does the system work?
- PMU Browser – synchrophasor data display and analysis module:
- display of measurement results from selected PMU devices referred to the MV voltage level via distribution transformer parameters.
- calculation of monitored parameter differences (phasor differentials) between two selected PMUs.
- geographical interface with PMU installation location visualisation and section disconnector state indication.
- automatic phase rotation and phase sequence correction with respect to the selected reference PMU.
- PMU Estimator – module for steady-state estimation after closing a normally-open disconnectors:
- construction of a reduced network model comprising the relevant MV feeders/sections.
- state estimation of current, voltage, and power conditions at the point of closed disconnector.
- visualisation of voltage, current, and power profiles along the main feeder in charts and in the geographical interface.
- support for both radially-fed (single-end) and ring-fed (dual-end) feeder configurations.
- automatic phase rotation and phase sequence correction with respect to the selected reference PMU.
- Communication infrastructure and network model:
- PMU devices communicate via IEC 60870-5-104 protocol over a mobile network (LTE).
- switching device states from the SCADA/DMS system transferred via the RTU7MC3 security gateway.
- central database for storage of system configuration, input measurement data, and estimation results.
- web interface accessible via HTTPS from the DSO intranet or through a VPN connection.
Analytical capabilities of the PMU BrEst system:
- Visualisation of synchronised voltage and current phasors from all integrated PMU devices (at both MV and LV levels).
- Calculation of measured parameter differentials between two selected PMUs.
- Automatic phase sequence and phase rotation correction with respect to the reference PMU.
- Circular power flow estimation after closing a selected normally-opened disconector.
- Display of voltage, current, and power profiles along the main feeder.
- Geographical visualisation of the distribution network topology including states of section disconectors.
- Support for analysis of both radially-fed and ring-fed feeder configurations.
What do you need to procure?
- PMU devices installed on the LV side of distribution transformers at key network nodes and a reference PMU on the MV busbar of the primary substation.
- Devices must provide synchronous measurement of three-phase voltages and currents with Class S accuracy (per IEC 61000-4-30) and a time deviation of ≤2 µs (GPS synchronisation).
- Communication interface supporting IEC 60870-5-104 protocol (1-second phasor reporting rate).
- Access to current switching device states from the SCADA/DMS system – provided via the RTU7MC3 security gateway.
- Distribution network model from GIS – line parameters (impedances, lengths, conductor cross-sections), transformer parameters (turns ratio, winding clock number, tap position), and network topology.
- Server platform for the PMU BrEst system (can be deployed as a physical or virtual machine).
What are the benefits?
- Network reconfiguration support: circular power flow estimation prior to real closing a normally-opened disconectors enables informed dispatcher decision-making during loop closing, e.g. for fault section isolation.
- Real-time network state monitoring: continuous synchrophasor-based voltage and current monitoring with geographical interface visualisation.
- Voltage and loading profile estimation: display of voltage and load current profiles along feeders enables identification of critical points (voltage drops, overloading, unbalance).
- Phase correction: automatic detection and correction of phase rotation and phase sequence/position errors, applicable during commissioning, transformer replacement, and distribution network development.
- Modularity and scalability: the system can be expanded with additional PMU devices; existing RTU7M users can enable PMU functionality by adding the PQM-S measurement card and GPS time synchronization.
- Secured web access: HTTPS access from the DSO intranet or via VPN – no dedicated client software installation required.
- Open hardware platform: PMU BrEst can also operate with third-party PMU devices, provided they meet Class S measurement accuracy and IEC 60870-5-104 communication requirements.
PMU Browser
PMU Browser
PMU Estimator
