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Protection voltage calculation method for passive breakdown protection device of sub-module device

A technology for breakdown protection and voltage protection, applied in emergency protection circuit devices, overvoltage-responsive protection, emergency protection devices that automatically disconnect, etc., can solve the problem of no calculation method, lack of scientific calculation methods and basis problems, to achieve the effect of improving the rationality and accuracy of the design

Pending Publication Date: 2021-12-24
CSG EHV POWER TRANSMISSION +2
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  • Claims
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Problems solved by technology

[0004] There is currently no calculation method for the protection voltage value of the sub-module passive breakdown protection device of the modular multilevel converter, and empirical values ​​are generally used, which lacks scientific calculation methods and basis

Method used

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  • Protection voltage calculation method for passive breakdown protection device of sub-module device
  • Protection voltage calculation method for passive breakdown protection device of sub-module device
  • Protection voltage calculation method for passive breakdown protection device of sub-module device

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Embodiment Construction

[0029] The present invention will be further described below. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0030] see figure 1 , the modular multilevel converter includes at least one sub-module connected in series, the sub-module is a half-bridge, full-bridge topology, etc., and the AC port of the sub-module adopts a bypass switch K and a passive breakdown protection device SCR for bypass protection .

[0031] An embodiment of the present invention provides a method for calculating the protection voltage of a sub-module passive breakdown protection device, such as figure 2 shown, including:

[0032] Step 1: Determine the highest voltage value U under the operating conditions of the sub-module nom , to calculate the overvoltage protection action value of the sub-module:

[0033] u p =k p * U nom ,

[0034] Among them, k p For the safe...

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Abstract

The invention discloses a protection voltage calculation method for a passive breakdown protection device of a sub-module, and the method comprises the steps: enabling a converter to achieve the breakdown through the overvoltage of the passive breakdown protection device connected in parallel with an AC port of the sub-module when a bypass switch of the sub-module refuses to operate, forming a short-circuit through-current state, and achieving the non-stop operation of a modular multi-level converter. According to the invention, the maximum voltage value under the operation condition of the sub-module, the sum of the breakdown voltage of the power device of the sub-module and the charging voltage increment of the peak current of the bridge arm during the closing period of the bypass switch of the sub-module are combined to obtain the protection voltage range calculation method of the passive breakdown protection device of the sub-module; the protection voltage value of the passive breakdown protection device of the sub-module is guided, and the design rationality and accuracy of the modular multilevel converter are improved.

Description

technical field [0001] The invention relates to the technical field of flexible DC power transmission and distribution, in particular to a method for calculating the protection voltage of a sub-module passive breakdown protection device. Background technique [0002] Modular multilevel converters are connected in series through modular and standardized sub-modules, and the AC ports of the sub-modules are usually connected in parallel with bypass switches and passive breakdown protection devices. During the operation of the sub-module, if the sub-module fails, it is necessary to close the bypass switch of the sub-module to make the sub-module present a short-circuit state and ensure the stable operation of the modular multilevel converter. The bypass switch is a mechanical structure. When the bypass switch refuses to operate, the current of the modular multilevel converter will continue to increase the voltage of the faulty sub-module until the sub-module explodes due to over...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00H02H3/00H02H3/20H02H7/12H02J3/36
CPCG01R19/0084H02H7/12H02H3/20H02H3/006H02J3/36Y02E60/60
Inventor 赵建宁任成林胡雨龙周竞宇朱铭炼谢晔源欧阳有鹏段军彭玉培甘运良付诗禧郝德娜
Owner CSG EHV POWER TRANSMISSION
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