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A unidirectional transformer-type HVDC circuit breaker based on an improved buck-boost converter

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 requirements for fast knife switch manufacturing, and the cutting speed cannot meet the new VSC-HVDC power transmission system, etc., to achieve the effect of fast execution

Active Publication Date: 2018-07-17
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current mechanical high-voltage DC circuit breaker can cut off the short-circuit current within tens of milliseconds, and the cutting speed of this fault current cannot meet the requirements of the new VSC-HVDC power transmission system
Solid state circuit breakers can easily overcome the limitation of breaking speed, but they will generate a lot of losses in steady state operation
The hybrid circuit breaker combines the good static characteristics of mechanical circuit breakers and the dynamic characteristics of solid state circuit breakers without arc breaking, and has the advantages of low operating loss, long service life, high reliability and good stability, but for the manufacture of fast switch The requirements are very high, and the breaking time is still affected by the fast switch and the protection system and communication time

Method used

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  • A unidirectional transformer-type HVDC circuit breaker based on an improved buck-boost converter
  • A unidirectional transformer-type HVDC circuit breaker based on an improved buck-boost converter
  • A unidirectional transformer-type HVDC circuit breaker based on an improved buck-boost converter

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Embodiment

[0056] Such as figure 1 As shown, a unidirectional transformer-type high-voltage DC circuit breaker based on an improved Buck-Boost converter, including a circuit breaker and a control system, wherein the circuit breaker includes an IGBT switch module group S connected to the positive input terminal 1 , IGBT switch module group S 1 The output terminal of the inductor L is connected to the inductor L, the output terminal of the inductor L is used as the positive output terminal, and the input capacitor C is connected between the positive input terminal and the negative input terminal. i , an output capacitor C is connected between the positive output terminal and the negative output terminal o , capacitance C o There is also an IGBT switch module group S connected in parallel at both ends of the 4 , IGBT switch module group S 4 The negative pole of the IGBT switch module group S is connected to the negative output terminal. 1 The output terminal of the diode module group D...

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Abstract

The invention discloses a unidirectional high-voltage DC circuit breaker based on an improved Buck-Boost converter, including a circuit breaker and a control system, wherein the control system includes an inner loop to adjust the control current and an outer loop to adjust the control voltage. Auxiliary controllers are added to carry out voltage transformation and protection control of high-voltage DC circuit breakers. Compared with the traditional high-voltage circuit breaker, the present invention has the advantages of more functions, fast breaking speed, and cost saving. Switching between the voltage state and the step-down state can be flexibly 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 a short-circuit fault occurs on the transmission line, and realize the protection of high-voltage DC The purpose of transmission equipment and load equipment.

Description

technical field [0001] The invention relates to a high-voltage direct current transmission transformation and protection control system, in particular to a unidirectional transformation type high-voltage direct current circuit breaker based on an improved Buck-Boost converter. 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...

Claims

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Application Information

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