Mixed-type high-voltage DC breaker and implementation method thereof

A high-voltage direct current and circuit breaker technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of breaking time and breaking current capacity that cannot meet the multi-terminal flexible direct current transmission system, high technical difficulty, high manufacturing cost, etc., and achieve easy expansion , mature technology, simple control effect

Active Publication Date: 2016-01-27
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are usually three methods of DC circuit breaker technology. 1) LC resonant DC circuit breaker: on the basis of conventional AC mechanical circuit breakers, by adding auxiliary circuits, superimposed increased oscillating current on the DC current of the arc-breaking gap, using Break the circuit when the current crosses zero. The mechanical circuit breaker manufactured by this principle cannot meet the requirements of the multi-terminal flexible DC transmission system in terms of breaking time and breaking current capacity; Breaking power electronic devices directly breaks the DC current. Although the solid-state circuit breaker manufactured by this principle can meet the requirements of the multi-terminal flexible DC system in terms of time, the loss is

Method used

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  • Mixed-type high-voltage DC breaker and implementation method thereof
  • Mixed-type high-voltage DC breaker and implementation method thereof
  • Mixed-type high-voltage DC breaker and implementation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Embodiment one:

[0035] see figure 1 , the hybrid high-voltage DC circuit breaker of the present invention is connected in series to the DC system through ports 1 and 2, and includes four branches, which are respectively the on-state branch, the pre-transfer branch, the re-transfer branch and the energy consumption branch. The branches are connected in parallel with each other.

[0036] The on-state branch is composed of at least one fast mechanical switch D connected in series with the first current transfer module M1 including fully controlled devices.

[0037] The pre-transfer branch is composed of the first inductance L1, the first half-controlled device thyristor series module S1 and the second current transfer module M2 including the full-controlled device connected in series.

[0038] The retransfer branch is composed of the first inductor L2, the second semi-controlled device thyristor series module S2 and the capacitor C connected in series.

[0039] The en...

Example Embodiment

[0050] Embodiment two:

[0051] see image 3 , in the second embodiment, the first current transfer module M1 and the second current transfer module M2 use a non-linear resistor R2 and at least one full-bridge module composed of four fully-controlled power switching devices and capacitors, and the non-linear resistors are connected in parallel in series Connect both ends of the full-bridge module.

Example Embodiment

[0052] Embodiment three:

[0053] see Figure 4 , in the third embodiment, the first current transfer module M1 and the second current transfer module M2 use the non-linear resistance R3 and two groups of unidirectional flow modules connected in antiparallel, and the non-linear resistance and two groups of unidirectional flow modules connected in antiparallel The flow modules are connected in parallel with each other.

[0054] Wherein, the one-way flow module is composed of at least one pair of fully controlled devices and non-controlled devices connected in forward series.

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PUM

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Abstract

The invention discloses a mixed-type high-voltage DC breaker and an implementation method thereof. The DC breaker is connected in a DC system in series and concretely comprises the following branches connected in parallel: an on-state branch, a pre-transfer branch, a re-transfer branch and an energy-dissipating branch. The on-state branch comprises at least one quick mechanical switch and a first current transfer module including a full control device, and the quick mechanical switch and the first current transfer module are connected in series. The pre-transfer branch comprises the following parts connected in series: a first inductor, a first semi-control device thyristor serial connection module, and a second current transfer module including a full control device. The re-transfer branch comprises the following parts connected in series: a second inductor, a second semi-control device thyristor serial connection module, and a capacitor. The energy-dissipating branch is formed by a non-linear resistor. The implementation method comprises corresponding operations when the DC system runs normally or when a short circuit fault happens to the DC system. With the prerequisites including a fast enough breaking speed and low losses ensured, the DC breaker employs the semi-control device thyristors, so that the capability of breaking current is good, the voltage-withstanding level is high, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to a circuit breaker and its realization method, in particular to a hybrid high voltage direct current circuit breaker and its realization method. Background technique [0002] With the development of multi-terminal DC transmission technology, high-voltage DC circuit breakers will become one of the key equipment to ensure the safe and stable operation of the system. Due to the high voltage level and small line impedance of the multi-terminal HVDC transmission system, once a line short-circuit fault occurs, it will quickly affect the DC transmission network and the AC network, and the fault must be removed quickly. Therefore, the high-voltage DC circuit breaker needs to operate quickly, which can minimize the fault duration or suppress the fault current, and reduce the impact of the fault on the AC / DC transmission network. [0003] At present, there are usually three methods of DC circuit breaker technology. 1) LC resonant DC circ...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 石巍曹冬明方太勋谢晔源杨兵王宇吕玮刘彬
Owner NR ELECTRIC CO LTD
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