Phase balancing of power transmission system

摘要

Phase balancing techniques for power transmission systems are disclosed. In one embodiment, a phase balancing protocol (240) includes executing a first phase balancing protocol (350) in relation to a first power transmission section (400a). A second phase balancing protocol (370) may be executed if the first phase balancing protocol (350) is unable to provide a phase balanced condition. The first phase balancing protocol (350) may utilize a first ordering sequence (364) to rank the current flow on the power lines (16) of the first power transmission section (400a), while the second phase balancing protocol (370) may utilize a second ordering sequence (384) to rank the current flow on the power lines (16) of the first power transmission section (400a). The order sequences (364, 384) are opposite of each other—one ranks the current flows from high-to-low, and the other ranks the current flow from low-to-high.

主权项

1. A method of phase balancing a power transmission system, comprising:
measuring a current flow on each power line of a plurality of power lines of a first power transmission section of a power transmission system, wherein each said power line is of a different phase, wherein each said power line has at least one first device mounted thereon, wherein each said first device is disposable in each of first and second modes, and wherein changing a given said first device between said first and second modes changes said current flow on its corresponding said power line; executing a first phase balancing protocol, comprising:
generating a first ranking of said plurality of power lines using a first ordering sequence of said current flows on said power lines, wherein the first said power line in said first ranking is an initial comparative power line for said first ranking;executing a first comparing step comprising comparing said current flow of said comparative power line in said first ranking to said current flow of the next said power line in said first ranking;executing a first switching step comprising switching at least one said first device, on each said power line in said first ranking that precedes said next said power line from said first comparing step, into a first modal configuration if a first phase imbalance condition exists between said power lines from said first comparing step;resetting said next said power line in said first ranking as said comparative power line, and then repeating said first comparing and first switching steps; and executing a second phase balancing protocol upon an occurrence of a first condition, comprising:
generating a second ranking of said plurality of power lines using a second ordering sequence of said current flows on said power lines, wherein the first said power line in said second ranking is an initial comparative power line for said second ranking, and wherein said second ordering sequence is opposite of said first ordering sequence;executing a second comparing step comprising comparing said current flow of said comparative power line in said second ranking to said current flow of the next said power line in said second ranking;executing a second switching step comprising switching at least one said first device, on each said power line in said second ranking that precedes said next said power line from said second comparing step, into a second modal configuration if a second phase imbalance condition exists between said power lines from said second comparing step, wherein said second modal configuration comprises said first device being in the other of said first and second modes; andresetting said next said power line in said second ranking as said comparative power line, and then repeating said second comparing and second switching steps.