SYSTEMS AND METHODS FOR ELECTRICAL POWER GRID MONITORING USING LOOSELY SYNCHRONIZED PHASORS
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United States of America Patent
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Issued Date -
Feb 9, 2012
app pub date -
Jul 12, 2011
filing date -
Jul 12, 2010
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Abandoned
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Abstract
The present disclosure describes systems and methods for monitoring an electrical power grid using loosely synchronized phasors. The grid can include a phasor measurement unit (PMU) that keeps a highly-accurate time, such as a time provided by GPS signals. A solar power inverter can include a clock that is synchronized to a less-accurate time, such as a time provided by a public time server or a radio time signal. The inverter can also include a PMU that generates phasors timestamped according to the less-accurate time. The inverter can receive phasors from the grid PMU. Although the grid and inverter phasors can be loosely synchronized in time, the inverter can analyze the grid and inverter phasors to determine a state of the grid. For example, the inverter can calculate a Pearson's correlation coefficient based on the grid and inverter phasors, and use the result to determine a state of the grid.
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