US 12,266,936 B2
Subspace-based approach to synchrophasor estimation
Zachary Drummond, Mesa, AZ (US); and Kevin Claytor, Columbia, MD (US)
Assigned to Arizona Board of Regents on behalf of Arizona State University, Scottsdale, AZ (US); and The United States of America as Represented by the Secretary of the Army, Washington, DC (US)
Filed by Arizona Board of Regents on behalf of Arizona State University, Scottsdale, AZ (US); and The United States of America as Represented by the Secretary of the Army, Washington, DC (US)
Filed on Dec. 23, 2021, as Appl. No. 17/561,062.
Claims priority of provisional application 63/129,970, filed on Dec. 23, 2020.
Prior Publication US 2022/0285944 A1, Sep. 8, 2022
Int. Cl. H02J 3/24 (2006.01)
CPC H02J 3/242 (2020.01) 18 Claims
OG exemplary drawing
 
1. A method for phasor estimation of a phasor measurement unit (PMU), wherein the PMU comprises at least one voltage sensor or current sensor, the method comprising:
measuring a signal with the at least one voltage sensor or current sensor;
receiving the measured signal;
estimating a size of a signal subspace of the measured signal using a threshold based on a harmonic mean of Eigenvalues associated with a set of Eigenvectors of the measured signal;
determining frequencies present in the signal subspace based on the size of the signal subspace and the Eigenvalues; and
using the determined frequencies to produce a phasor estimate for a frequency of interest in the measured signal.