High-voltage direct current breaker and fault cutting method thereof based on Zeta converter topologies

A high-voltage direct current, circuit breaker technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of high cost of circuit breaker equipment, slow response speed, high equipment operation loss, etc.

Active Publication Date: 2015-07-08
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 provide a new type of unidirectional transformer-type HVDC circuit breaker and its short-circuit fault removal based on the Zeta converter topology method to achieve the purpose of simultaneously realizing the buck-boost function and circuit breaker function in the same power flow direction

Method used

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  • High-voltage direct current breaker and fault cutting method thereof based on Zeta converter topologies
  • High-voltage direct current breaker and fault cutting method thereof based on Zeta converter topologies
  • High-voltage direct current breaker and fault cutting method thereof based on Zeta converter topologies

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Embodiment

[0067] like figure 1 As shown, a new type of unidirectional transformer-type HVDC circuit breaker based on the Zeta converter topology, including the circuit breaker and the control system, wherein the circuit breaker includes an input capacitor C connected between the positive input terminal and the negative input terminal i , the positive input of the input capacitor and the inductor L 1 connection, IGBT switch module group S 1 with L 1 The output terminal of the capacitor C is connected to the positive terminal of the intermediate capacitor C, and the negative terminal of the capacitor C is connected to the inductor L 2 The input end of the diode is connected to the cathode of the diode, and the inductor L 2 negative terminal with output capacitor C o connected. L 1 The output terminal of the diode, the anode of the diode and the output capacitor C oThe negative terminal, the negative input terminal and the negative output terminal are grounded at the same time. The...

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Abstract

The invention discloses a high-voltage direct current breaker and a fault cutting method thereof based on Zeta converter topologies, and aims at solving the problems that the cost of existing breaker equipment is high, the responding speed is low, and equipment operation wastage is high. The breaker comprises a breaker body and a control system, wherein the control system comprises inner ring adjustment control currents and outer ring adjustment control voltage; an auxiliary controller is added to double closed-loop adjustment, and voltage transformation and protective control are conducted on the high-voltage direct current breaker. Compared with a traditional high-voltage breaker, the high-voltage direct current breaker has the advantages that the breaker has more functions, the breaking speed is higher, and the cost is saved. When a high-voltage direct current transmission system is in a normal operation, functions of boosting and reducing voltage are achieved, a boost state and a reduction voltage state are switched over, and the breaker can be used in electric power circuits with different voltage classes; meanwhile when a short-circuit fault of electric transmission circuits occurs, the short-circuit fault can be effectively cut 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 Zeta 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 to de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 唐良义陈维荣唐立刘志祥李奇戴朝华张雪霞
Owner SOUTHWEST JIAOTONG UNIV
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