Patent ID: 6934654
Filing Date: 2005-08-23
Classification: G01R,H02H

Abstract:
1. A system for determining an accurate fundamental phasor for a signal waveform of a power system when a difference exists between a rated frequency and an actual frequency of the signal waveform, the system comprising: a first circuit for determining a measured phasor representing the signal waveform, the measured phasor including a real part and an imaginary part; a second circuit for determining the actual frequency of the signal waveform and the frequency difference between the actual frequency and the rated frequency of the signal waveform; a third circuit for determining a plurality of correction factors associated with the frequency difference, each of the plurality of correction factors having a real part and an imaginary part; and a fourth circuit for determining the accurate fundamental phasor including a real part and an imaginary part, the fourth circuit multiplying the real and imaginary parts of the measured phasor by a 2 by 2 compensating matrix, the 2 by 2 matrix including elements with values that are all non-zero, the elements including the plurality of correction factors.