Method for starting direct-current deicing system of overhead ground wire and compound optical fiber ground wire

Abstract

The invention discloses a method for starting a direct-current deicing system of an overhead ground wire and a compound optical fiber ground wire. A direct-current deicing device used in the starting method comprises a current changer, a direct-current disconnecting link and a control protective system, and the two ends of the overhead ground wire or the compound optical fiber ground wire needing to be deiced are directly connected with the positive pole and the negative pole of the current changer in the direct-current deicing device respectively through the direct-current disconnecting link, or are connected with the positive pole and the negative pole of the current changer in the direct-current deicing device respectively through any phase of conductors via the direct-current disconnecting link. The method for starting the direct-current deicing system comprises the steps of 1) overlaying a current value on a minimum permissible current to be used as a deblocking reference current during a period of time of giving out a deblocking command, 2) enabling the deblocking reference current to be linearly decreased to the minimum permissible current after the period of time, and 3) adopting a proportional-integral regulator to enable the current in a direct-current deicing circuit to track the deblocking reference current in the deblocking process. The method for starting the direct-current deicing system of the overhead ground wire and the compound optical fiber ground wire can ensure the fact that the direct-current deicing device can fast set up a stable direct current.

Description

technical field [0001] The invention relates to a start-up method for a direct-current ice-melting system of an overhead ground wire and a composite optical fiber ground wire, and belongs to an innovative technology of a start-up method for a direct-flow ice-melting system of an overhead ground wire and a composite optical fiber ground wire. Background technique [0002] Among the various natural disasters suffered by the power system, ice disaster is one of the most serious threats. Compared with other accidents, the losses caused by ice disasters to the power grid are often more serious, ranging from ice flashes, to downed towers and disconnected lines, and even grid failure. [0003] In recent years, various meteorological disasters around the world have become more frequent, extreme weather and climate events have become more abnormal, ice disasters have caused more serious losses and impacts on the power system, and the damage has become stronger and more complex. gett...

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Problems solved by technology

[0009] In the practice of DC ice melting with the ground wire and composite optical ground wire (OPGW), the ice melting system failed to start and the current could not be established many times, which seriously affected the DC ice melting function.

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