Circuit breaker with receiving end of LCC-VSC series-parallel direct current transmission system, and use method thereof

Abstract

The invention provides a circuit breaker with a receiving end of an LCC-VSC series-parallel direct current transmission system, and a use method thereof. The circuit breaker comprises: a plurality ofwiring points, first lines and second lines, which are in one-to-one correspondence with the wiring points, a third line and a fourth line, wherein one of the plurality of wiring points is electrically connected with an LCC converter station, the remaining wiring points are electrically connected with a VSC converter station, each wiring point is respectively connected to the both ends of the third line through the first lines and the second lines, and the fourth line is connected in parallel to the both ends of the third line. By adoption of the circuit breaker with the receiving end of the LCC-VSC series-parallel direct current transmission system and the use method thereof provided by the invention, the use of the circuit breaker is reduced, thereby reducing the cost and slowing down the operation loss.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a circuit breaker of a direct current transmission system whose receiving end is an LCC-VSC hybrid type and a method for using the same. Background technique [0002] LCC-HVDC (Line Commutated Converter based High Voltage Direct Current) has the advantages of low cost, low loss, and high reliability. It has been used in submarine cable power transmission, large-capacity long-distance power transmission, asynchronous Power grid interconnection and other occasions have been widely used, but objectively, there are shortcomings such as large demand for reactive power compensation capacity, strong dependence on the AC system, and commutation failure problems. Compared with LCC-HVDC, VSC-HVDC (Voltage Source Converter based High Voltage DirectCurrent, Voltage Source Converter High Voltage Direct Current) using full-control devices can achieve four-quadrant independe...

AI Technical Summary

Problems solved by technology

Although the developed high-voltage DC circuit breaker technology is technically feasible, its cost is high, and it is difficult to be widely used in the power grid like AC circuit breakers

[0004] At present, for the above-mentioned DC transmission system whose receiving end is LCC-VSC hybrid type, at the receiving end, a hybrid DC circuit breaker needs to be installed on each DC line, which increases the cost and speeds up the operation loss

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