High-voltage direct-current breaker based on Buck-Boost converter topology and fault removal method thereof

Abstract

The invention discloses a high-voltage direct-current breaker based on Buck-Boost converter topology and a fault removal method thereof. The purpose is to solve the problems that existing breaker equipment is high in cost, low in response speed and high in operation loss. The high-voltage direct-current breaker comprises a breaker body and a control system. The control system comprises inner loop adjusting and controlling current and outer loop adjusting and controlling voltage, an auxiliary controller is additionally arranged for double-closed-loop adjusting and used for performing voltage transforming and protection controlling on the high-voltage direct-current breaker, and therefore the high-voltage direct-current breaker has the advantages of achieving more functions, being higher in on-off speed and lowering the cost better compared with a traditional high-voltage breaker. The high-voltage direct-current breaker can achieve the functions of increasing and decreasing the voltage when a high-voltage direct-current power transmission system normally operates, can achieve switching between the voltage-increasing state and the voltage-decreasing state and can be flexibly applied to power lines of different voltage grades. Meanwhile, when happening on the power transmission lines, short-circuiting faults can be effectively removed in time.

Description

technical field [0001] The invention relates to a high-voltage direct current transmission transformation and protection control system, in particular to a novel unidirectional transformation type high-voltage direct current circuit breaker based on Buck-Boost converter topology. Background technique [0002] In the high-voltage AC transmission system, the normal input and accidental disconnection of the transmission line are realized through the high-voltage AC circuit breaker. In the high-voltage direct current transmission system, the control of the converter valve control (gate) is used to eliminate temporary faults or when a short-circuit fault occurs, a mechanical high-voltage circuit breaker is used to cut it off. However, with the development of VSC-HVDC power transmission technology Due to the long response time of mechanical high-voltage DC circuit breakers, it is difficult to meet the needs of rapid removal of short-circuit faults. Therefore, it is very necessary...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high cost, slow response speed and high equipment operation loss of existing circuit breakers, and provides a new type of unidirectional transformer-type high-voltage DC circuit breaker based on Buck-Boost converter topology, which can simultaneously achieve Realize the purpose of realizing the buck-boost function and circuit breaker function in the same power flow direction

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