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Friday, December 14, 2012

MISO Gets On Board With Synchrophasor Measurements 

The Midwest grid operator (MISO) has included synchrophasor electricity units into two crucial elements of its grid analytics, part of the U.S. Department of Energy's goal of revitalising the nation's electrical grid. This will allow MISO to find out transfer boundaries on the system more accurately. The Department of Energy Smart Grid Investment Grant of $17.3 million was awarded toward the project in 2009 and by April 2013, MISO expects to produce synchrophasor info readily available to its real-time system operators.

Synchrophasor units use high-speed, real-time synchronized measurements to diagnose the well being in the electricity grid. With the info presented, electrical utilities can use existing energy more efficiently and push more energy through the grid while minimizing the likelihood of energy disruptions like blackouts.

As a strong analytical tool, this info may help better comprehend observed abnormalities and system activities. After the fact info evaluation is crucial in better understanding the magnitude of events on the energy system. The 50,000 mile interconnected system through their 11-state region now has 161 synchrophasor security measurement units set up and fully operational, resulting in highly sensitive measurements for grid diagnostics.

With a lot more than $23.6 billion in gross yearly market power transactions, MISO manages one of the world's biggest electricity markets. It's ruled by an independent Board of Directors along with a non-profit 501(C)(4) organisation with operation centres in St Paul and Carmel, Minnesota.

Sub.net supports the IEEE standard C37.118-2005 for synchrophasors so it can act as a phasor measurement unit (PMU) within a power system. The standard includes a communication protocol where regular data frames are sent from the PMU to a phasor data concentrator (PDC) which receives data from many such PMUs. The data frames include a very accurate time stamp which is derived from sub.net’s embedded GPS receiver and selected voltage and current measurements with their absolute phase angles. By combining phasor measurements across a wide area of the power system a near real time state determination of the network can be made. PMUs have a wide range of applications within power utilities.

Sub.net can send phasor data frames via either the RS232 port or the Ethernet port using TCP at up to one frame per supply cycle (50 or 60 frames per second). The phasors can include the individual phase voltages and currents and the positive, negative and zero sequence components. The data frame can also include the RMS values of the analogue inputs and the state of the contact inputs.

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