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High Voltage DC Circuit Breaker Based on Zeta Converter Topology

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 equipment operation loss, slow response speed, high cost of circuit breaker equipment, etc.

Active Publication Date: 2018-06-19
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • 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 DC Circuit Breaker Based on Zeta Converter Topology
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  • High Voltage DC Circuit Breaker Based on Zeta Converter Topology

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Embodiment

[0067] Such as 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. ...

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Abstract

The high-voltage DC circuit breaker based on the Zeta converter topology and its fault removal method are aimed at solving the problems of high equipment cost, slow response speed, and high operating loss of the existing circuit breaker. The high-voltage DC circuit breaker includes a circuit breaker and a control system. , in which the control system includes the inner loop to adjust the control current and the outer loop to adjust the control voltage. By adding an auxiliary controller in the double closed loop adjustment to carry out the voltage transformation and protection control of the high voltage DC circuit breaker, compared with the traditional high voltage circuit breaker, it has more function, fast breaking speed, cost saving, etc., it can not only realize the buck-boost function of the circuit breaker when the HVDC transmission system is in normal operation, but also can switch between the boost state and the buck state, which can realize flexible It can be applied to power lines of different voltage levels; at the same time, it can also realize timely and effective removal of short-circuit faults when short-circuit faults occur on transmission lines.

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 Patents(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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