Direct-current inter-electrode breaking device and control method

A breaking device and pole-to-pole technology, applied to emergency protection circuit devices, electrical components, etc., can solve the problems of high risk and high difficulty in technical realization, and achieve the effects of reduced technical difficulty, easy energy extraction, and high cost performance

Active Publication Date: 2019-02-12
NR ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, due to the different installation locations, the two devices usually need to be configured in the DC transmission l

Method used

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  • Direct-current inter-electrode breaking device and control method
  • Direct-current inter-electrode breaking device and control method
  • Direct-current inter-electrode breaking device and control method

Examples

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[0070] The present invention will be further described below in conjunction with the drawings.

[0071] Such as figure 1 As shown, the DC inter-electrode disconnecting device of the present invention includes a transfer branch 1, at least one positive isolation branch 7 and at least one negative isolation branch 8. The transfer branch has at least one transfer unit 2 and at least one ground potential voltage coupling device 3 are connected in series in the same direction, the first end of the series connection is defined as the positive pole of the transfer branch, and the tail end of the series connection is defined as the negative pole of the transfer branch; the ground potential voltage coupling device can output and transfer the branch Voltage with opposite polarity; one end of the positive isolation branch is connected to the positive pole of the transfer branch, the other end is connected to the positive pole of the DC line, one end of the negative isolation branch is connec...

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Abstract

The invention discloses a direct-current inter-electrode breaking device which comprises a transfer branch, at least one positive electrode isolation branch and at least one negative electrode isolation branch. The transfer branch is formed by serially connecting at least one transfer unit and at least one ground potential voltage coupling device in a same direction, and the ground potential voltage coupling devices are arranged at positions, close to ground potential, of the transfer branch and output voltage opposite to polarity of the transfer branch. The invention further discloses a control method based on the direct-current inter-electrode breaking device. The direct-current inter-electrode breaking device is parallelly connected between a positive electrode and a negative electrodeof a medium-and-high-voltage direct-current line; when the direct-current line is in a fault, the fault can be isolated, and fault current can be broken; when the direct-current line is with overvoltage, excessive energy can be consumed; the device has functions that a direct-current circuit breaker and a direct-current chopper and is quite high in performance-cost ratio and is easy to realize, and the problem of high-voltage energy taking is solved.

Description

technical field [0001] The invention belongs to the technical field of high-power electric current conversion, and in particular relates to a DC inter-pole breaking device and a control method. Background technique [0002] In HVDC power transmission system, HVDC circuit breaker and DC chopper circuit are crucial equipment. Due to the high voltage level and small line impedance of the HVDC transmission system, once a line short circuit fault occurs, it will soon affect the DC transmission network and the AC network, and the fault must be removed quickly. The DC chopper circuit is mainly used in the application scenario of island power supply. If the power generation end is an inertial power source similar to wind power, when the power receiving end fails, because the power cannot be sent out, the energy will be accumulated on the DC side, resulting in the voltage of the DC transmission line. The above two high-voltage power electronic devices both play a key role in the DC ...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 谢晔源曹冬明王宇姜田贵杨兵吕玮方太勋李海英
Owner NR ELECTRIC CO LTD
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