US 12,483,063 B2
Secure distributed state estimation for networked microgrids
Mehmet H. Cintuglu, Raleigh, NC (US); and Dmitry Ishchenko, Cary, NC (US)
Assigned to Hitachi Energy Ltd, Zurich (CH); and ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH); and Hitachi Energy Ltd, Zürich (CH)
Filed on Sep. 26, 2018, as Appl. No. 16/142,103.
Prior Publication US 2020/0099252 A1, Mar. 26, 2020
Int. Cl. H02J 13/00 (2006.01); G01R 21/133 (2006.01); G06F 17/16 (2006.01)
CPC H02J 13/00001 (2020.01) [G01R 21/133 (2013.01); G06F 17/16 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A method of operating a first microgrid of a networked microgrid system that includes the first microgrid and a plurality of other microgrids, the method comprising:
measuring a first plurality of local measurements using a plurality of field devices of the first microgrid;
calculating a first local state estimation with a microgrid control system of the first microgrid, the calculating using the first plurality of local measurements;
receiving, by the microgrid control system, a plurality of local state estimations from the plurality of other microgrids, the local state estimations being received by way of a microgrid communication network;
calculating, by the microgrid control system, a plurality of global state estimations with the microgrid control system and the plurality of other microgrids using the first local state estimation and the plurality of local state estimations;
determining that the plurality of global state estimations did not converge;
based on the determination that the plurality of global state estimations did not converge, detecting false data in a first global state estimation of the plurality of global state estimations calculated with the microgrid control system using the microgrid control system and the plurality of other microgrids;
removing the first global state estimation from the plurality of global state estimations;
iteratively updating the remaining global state estimations of the plurality of global state estimations with the microgrid control system and the plurality of other microgrids;
determining that the global state estimations are not converging;
using a modified global state estimation equation to detect a compromised microgrid control system;
cutting links with the compromised microgrid control system;
again iteratively updating the remaining global state estimations without global state estimations of the compromised microgrid control system until the remaining global state estimations of the plurality of global state estimations converge thereby obtaining converged global state estimations;
monitoring the first microgrid using the converged global state estimations; and
operating controllable devices of the first microgrid and protecting devices coupled to the first microgrid from faults and other conditions by using the converged global state estimations for stability analysis and demand response.