Patent ID: 9600004
Date: 2017-03-21
CPC Classifications: G05F,H01F,H02J,H02P,Y02E,Y04S

Claim:
1. An electric power system comprising: an on-load tap changing (OLTC) transformer comprising at least one primary winding and at least one secondary winding, wherein a portion of the at least one primary winding and the at least one secondary winding are inductively coupled to each other; at least one on-load tap changer coupled to the at least one primary winding or the at least one secondary winding, wherein the at least one on-load tap changer is selectively configured to regulate the portion of the at least one primary winding or the at least one secondary winding that are inductively coupled to each other; at least one controller coupled to the at least one on-load tap changer, wherein the at least one controller is configured to determine a permissible voltage range defined by a bandwidth around a voltage set-point at the at least one on-load tap changer, wherein the bandwidth is variable and is a function of one or more electrical network states; wherein the one or more electrical network states are indicated by current or power flow measurements at the at least one tap changer; and wherein the at least one controller is further configured to determine a maximum possible voltage rise and a maximum possible voltage drop in the electrical network for each of the current or power flow measurements at the tap changer based on a plurality of factors, and wherein the plurality of factors comprise line resistances, line lengths, power ratings of at least one load, power ratings of at least one power source, distances between the tap changer and at least one load, and distances between the tap changer and at least one power source.