Abstract
Double-circuit transmission lines play a very important role in electric power transmission. When a line-to-line nongrounded fault occurs on double-circuit transmission lines, for traditional tripping and reclosing methods, tripping of all six phases may cause power system instability, and fixed time autoreclosing may reclose the double-circuit transmission lines to a nonextinguished fault. In this paper, a novel tripping strategy is proposed; when a line-to-line nongrounded fault occurs, some part of the electric power can be transmitted after tripping, and many kinds of nongrounded faults can be equivalent to a single-phase to ground fault. Furthermore, reactive power characteristics are adopted to determine the fault extinction. Finally, an adaptive autoreclosing scheme for line-to-line nongrounded faults on double-circuit transmission lines based on phase-to-phase reactive power is proposed. The accuracy and feasibility of the propose method are verified by relevant simulation experiments, and multiple operation conditions are considered.
Highlights
Double-circuit transmission (DCT) is an electric power transmission method using two circuits in the same towers; this kind of power transmission can deliver more electric power when fewer power transmission corridors are consumed [1]–[3]
CHARACTERISTIC ANALYSIS OF PHASE-TO-PHASE REACTIVE POWER DCT lines often use shunt reactors; this paper focuses on proposing an adaptive autoreclosing scheme for shunt reactor-compensated DCT lines
This study proposes an AAR scheme for LLN faults on DCT lines on the basis of the phase-to-phase reactive power (PPRP)
Summary
Double-circuit transmission (DCT) is an electric power transmission method using two circuits in the same towers; this kind of power transmission can deliver more electric power when fewer power transmission corridors are consumed [1]–[3]. Due to the parallel structure, lineto-line nongrounded faults (LLN faults, i.e., nongrounded faults occurring across two circuits) may occur on DCT lines, which may trip all six phases in the two circuits when the traditional tripping method is utilized In this circumstance, serious blackouts may be caused by completely cutting off an important power transmission channel [4], [5]. Due to the relatively complicated topological structure of DCT lines, 49 kinds of LLN faults may occur on these lines This phenomenon brings various challenges for phase tripping after fault phase selection of the power system protection. When a fault arc is natural extinguished and has a relatively long duration, the TVS may not be detected, and a reclosing failure may occur in this situation [18] These AED criteria cannot be utilized on transmission lines without shunt reactors. The accuracy and feasibility of the proposed adaptive autoreclosing scheme under multiple running conditions are verified through simulation software named Power Systems Computer Aided Design/Electromagnetic Transients including DC (PSCAD/EMTDC) in Section VI, and relevant discussions and conclusions are given in Sections VII and VIII
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