Converter station bipolar parallel operation line switching system and method

Abstract

The invention provides a convertor station bipolar parallel running line switching system and method. According to the system, an output end of an alternating current (AC) power supply is connected toa negative pole convertor station M1 and a positive pole convertor station M2; an upper bridge arm outgoing line of the negative pole convertor station M1 is earthed through a negative earthing polereactor L1 and a first isolating switch S1; a lower bridge arm outgoing line of the positive pole convertor station M2 is earthed through a positive earthing pole reactor L2; a lower bridge arm outgoing line of the negative pole convertor station M1 is provided with a second isolating switch S2; one end of a third isolating switch S3 is connected with the upper bridge arm outgoing line of the negative pole convertor station M1, and the other end of the third isolating switch S3 is connected with the lower bridge arm outgoing line of the negative pole convertor station M1; one end of a fourth isolating switch S4 is connected with the upper bridge arm outgoing line of the positive pole convertor station M2, and the other end of the fourth isolating switch S4 is connected with the upper bridge arm outgoing line of the negative pole convertor station M1. By means of the bipolar parallel running line switching system and method, deicing of a convertor station bipolar parallel running line is achieved, and the deicing cost is low.

Description

technical field [0001] The invention relates to the technical field of ice-melting electric power system lines, in particular to a system and a method for realizing line-melting ice-melting by reversing gates of a bipolar parallel operation line in a converter station. Background technique [0002] Ice and snow disasters will cause heavy icing on overhead lines, resulting in a sharp decline in the mechanical and electrical performance of the line, which will lead to the collapse of transmission towers, power supply interruptions and other hazards, seriously threatening the safe and reliable operation of the power grid, and causing huge economic losses. Therefore, it is very necessary to melt the ice of the ice-coated transmission lines. [0003] At present, the deicing methods of transmission lines mainly include thermal deicing, mechanical deicing, and natural passive deicing. Among them, thermal deicing has the advantages of simple operation and easy implementation, and is...

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