Patent ID: 7710729
Filing Date: 2010-05-04
Classification: G01R

Abstract:
1. A method of filtering invalid measurements, comprising the steps of: (a) receiving measurements from a first phasor measurement unit at a sending bus i of a transmission line, and a second phasor measurement unit at a receiving bus j of said transmission line; (b) calculating charging reactive powers at said sending bus and said receiving bus; a reactive power flow excluding charging reactive power at said sending bus, a reactive power flow excluding charging reactive power at said receiving bus, and a reactive power loss of said line, using said measurements; (c) calculating a grounding admittance Y(new) using the following equation: wherein V (d) using said grounding admittance Y(new) to recalculate said charging reactive power at said receiving bus, and said reactive power flow excluding charging reactive power at said receiving bus; (e) calculating a resistance R wherein P wherein θ ji =θ j −θ i wherein θ i is a voltage angle at said sending bus and θ j is a voltage angle at said receiving bus.