Patent ID: 8457912

Claim:
A method for monitoring a power grid, the method comprising: measuring by a first power line sensor first time-stamped data representing AC power carried by the power grid at a first location on the power grid; measuring by a second power line sensor second time-stamped data representing AC power carried by the power grid at a second location on the power grid; communicating from the first power line sensor to a grid analysis device the first time-stamped data representing AC power carried by the power grid at the first location on the power grid; communicating from the second power line sensor to the grid analysis device the second time-stamped data representing AC power carried by the power grid at the second location on the power grid; synchronizing by the grid analysis device the first time-stamped data representing AC power carried by the power grid at the first location on the power grid with the second time-stamped data representing AC power carried by the power grid at the second location on the power grid; unwrapping by the grid analysis device the synchronized first time-stamped data to produce first unwrapped absolute angle data; unwrapping by the grid analysis device the synchronized second time-stamped data to produce second unwrapped absolute angle data; analyzing the first unwrapped absolute angle data and second unwrapped absolute angle data to generate predictions of instability of the power grid.