Method for realizing ice melting in distribution network by making active ring current with flexible multi-state switches

Abstract

The invention discloses a method for realizing ice melting in a distribution network by making an active ring current with flexible multi-state switches. The method comprises: selecting an ice-meltingtarget line; reconstructing a distribution network through a distribution network communication switch and reconstructing the ice-melting target line into an ice-melting ring network path; setting working modes of flexible multi-state switches; to be specific, setting a flexible multi-state switch at the ice-melting target line side to work in a PQ mode and a flexible multi-state switch at a non-ice-melting communication line side to work in a direct-current constant-voltage control mode; and calculating an active power P of the ice-melting line based on an ice-melting current needed by the ice-melting target line, using the P as an active power reference value of the flexible multi-state switch at the side, starting the flexible multi-state switches at the two sides, and adjusting voltage phases of the flexible multi-state switches, and generating an active power flow in positive correlation with a phase difference value. Therefore, problems of complicated line outage operation and the short-circuiting procedures melting efficiency and the limited length of the ice-melting line during the ice melting of the transmission line in the prior art can be solved.

Description

technical field

[0001] The invention belongs to the deicing technology of transmission lines, in particular to a method for deicing a distribution network by using a flexible multi-state switch to produce active circulation. Background technique

[0002] At present, the most effective deicing methods for the distribution network are DC deicing, operating mode deicing and AC short-circuit deicing with transformers. The above deicing methods are relatively limited in the deicing range of distribution network lines. Among them, the DC icing of the distribution line needs to stop the transmission line, the line outage operation and short-circuiting procedures are complicated, and the icing efficiency is not high. The icing operation mode is affected by the line load and can only be carried out on some lines, with a transformer for AC Short-circuit melting ice needs to stop the transportation line, and the opposite side needs to manually short-circuit the line. Second, the length...

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