Patent ID: 9411005
Filing Date: 2016-08-09
CPC Classification: G01R,H02J,Y02P,Y04S

Claim Text:
1. A method of identifying the location of a fault in a power distribution system, the method comprising: in response to a fault located at one of a plurality of distributed resources on one or more feeders of a power distribution system comprising a distribution grid, wherein each of the one or more feeders comprises a plurality of distributed resources and wherein a distance of each of the plurality of distributed resources relative to the distribution grid is known, generating a current to be injected into the power distribution system by a controllable voltage source converter of one or more of the plurality of distributed resources not located at the fault on the feeder, wherein the one or more of the plurality of distributed resources not located at the fault on the feeder is a DC voltage distributed resource providing a DC signal and injecting, by the one or more of the plurality of DC voltage distributed resources not located at the fault on the feeder, the current into the power distribution system; measuring a voltage level at each of the plurality of distributed resources resulting from the current injected into the power distribution system by each of the one or more distributed resources not located at the fault on the feeder; generating a voltage profile from the voltage measurements at each of the one or more distributed resources, wherein the voltage profile comprise the voltage level at each of the plurality of distributed resources relative to the distance of each of the plurality of distributed resources from the distribution grid of the power distribution system; and analyzing the voltage profile to identify the location of the fault in the power distribution system, wherein analyzing the voltage profile further comprises identifying a voltage level drop at one of the plurality of distributed resources located at a first distance from the distribution grid and a corresponding voltage rise at one or more of the plurality of distributed resources located at a second distance from the distribution grid, wherein the second distance is greater than the first distance.