An automatic charging type forced zero-crossing high-voltage DC circuit breaker

Abstract

The invention discloses an automatic-charging forced zero-crossing high-voltage direct-current breaker which comprises a quick switch unit, an energy absorption unit, a coupling electric reactor unit, a convertation capacitor unit and a main loop isolating switch unit, wherein the quick switch unit is composed of a quick switch and a quick switch energy supply module; the quick switch is used for bearing a system voltage after disconnection of a current; the energy absorption unit is used for performing voltage limit protection on the quick switch; the coupling electric reaction unit is used for coupling a failure circuit with a convertation capacitor branch; the convertation capacitor unit is used for forming oscillation together with the coupling electric reactor unit; the main loop isolating switch is used for disconnecting after successful disconnection of the breaker, so as to protect internal components of the direction-current breaker. The automatic-charging forced zero-crossing high-voltage direct-current breaker provided by the invention is small in pre-charging equipment volume, low in requirements on convertation branch trigger switch speed requirement, simple to control and capable of disconnecting failure currents in any direction.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current circuit breakers, and more specifically relates to an automatic charging type forced zero-crossing high-voltage direct current circuit breaker. Background technique [0002] Compared with AC transmission, HVDC transmission has the advantages of economical line cost, no need for stable operation of the two-terminal system, and simple and easy power adjustment. It is especially suitable for ultra-high voltage, large-capacity, and long-distance transmission. At present, there are more than 90 HVDC projects put into operation in the world, with a total capacity of more than 70,000MW. However, the high-voltage direct current transmission systems operating in the world are all point-to-point connections. When a fault occurs, the circuit breaker on the AC side can only be disconnected, resulting in the shutdown of the entire converter station, which greatly affects the reliability of the direct...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide an automatic charging type forced zero-crossing high-voltage DC circuit breaker, which aims to solve the pre-charging equipment volume of the pre-charging forced zero-crossing high-voltage DC circuit breaker in the prior art. Huge size, high switching speed requirements for commutation branches, complex control, and technical problems of only breaking one-way fault current

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