US 11,927,610 B2
Detection of ringdown for electromechanical mode identification in online environment
Md Arif Khan, Pullman, WA (US); Riley Grant Huddleston, Moscow, ID (US); and Gregary C. Zweigle, Pullman, WA (US)
Assigned to Schweitzer Engineering Laboratories, Inc., Pullman, WA (US)
Filed by Schweitzer Engineering Laboratories, Inc., Pullman, WA (US)
Filed on Jul. 16, 2021, as Appl. No. 17/378,249.
Prior Publication US 2023/0015611 A1, Jan. 19, 2023
Int. Cl. G01R 19/25 (2006.01); G01R 21/133 (2006.01)
CPC G01R 19/2513 (2013.01) [G01R 21/133 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system, comprising:
a memory; and
a processor operatively coupled to the memory, wherein the processor is configured to:
obtain electrical measurements of a power system;
determine a scaled energy value of a first set of the electrical measurements that is scaled with respect to a second set of electrical measurements;
determine that a potential ringdown event occurred by comparing the scaled energy value of the first set of electrical measurements to a threshold energy value;
determining a scaled error value by comparing the electrical measurements to a ringdown model;
determine that the potential ringdown event is a confirmed ringdown event by comparing the scaled error value to a threshold error value;
generate one or more mode estimates from the confirmed ringdown event; and
send a signal indicating the one or more mode estimates; and
a device to receive the mode estimates to determine that the power system has exceeded a reliability threshold and to open a circuit breaker to disconnect a portion of the power system.