CN-121984335-A - Method and device for inhibiting short-circuit impact current of bypass switch of converter valve submodule

CN121984335ACN 121984335 ACN121984335 ACN 121984335ACN-121984335-A

Abstract

The application provides a method and a device for inhibiting short-circuit impact current of a bypass switch of a converter valve submodule, which relate to the field of maintenance of electric equipment and comprise the steps of after a space magnetic ring structure is arranged at the bypass switch of the converter valve submodule, determining the current parasitic inductance value of the bypass switch according to the current magnetic field intensity and relative magnetic permeability corresponding to the short-circuit current flowing through the bypass switch of the converter valve submodule when the short-circuit fault occurs to the converter valve submodule; and if the short-circuit current peak value meets a predetermined threshold range, judging that the bypass switch short-circuit impact current of the converter valve submodule is inhibited. The application can reduce the short-circuit electromotive force by reducing the short-circuit current peak value, thereby reducing the influence on the main contact.

Inventors

JI YIRUN
HUANG BIN
ZHANG GUOHUA
LV ZHIRUI
YUAN QIAN
LIU XINYANG
Liu Zhuogun
LIU BAIYAN
JIE ZIYAO
HAO ZHEN
LI YU
YUAN WENQIAN
YANG MINXIANG
WANG QING
LI XUAN
LAN HAIBO
XU CHI
HUAI QING

Assignees

国网冀北电力有限公司电力科学研究院
国网冀北电力有限公司
国家电网有限公司直流技术中心
国家电网有限公司

Dates

Publication Date: 20260505
Application Date: 20251230

Claims (10)

1. A method for inhibiting short-circuit impact current of a bypass switch of a converter valve submodule is characterized by comprising the following steps: When a short-circuit fault occurs to a converter valve submodule, determining the current parasitic inductance value of a bypass switch of the converter valve submodule according to the current magnetic field intensity and the relative magnetic permeability corresponding to the short-circuit current flowing through the bypass switch of the converter valve submodule; determining a short-circuit current peak value according to the current parasitic inductance value; And if the short-circuit current peak value meets a predetermined threshold range, judging that the bypass switch of the converter valve submodule is inhibited from short-circuit impact current.
2. The converter valve submodule bypass switch short-circuit rush current suppression method of claim 1, further comprising: before a space magnetic ring structure is arranged at a bypass switch of a converter valve submodule, when a short circuit fault occurs to the converter valve submodule, determining an original parasitic inductance value of the bypass switch according to original magnetic field intensity and original relative magnetic permeability corresponding to short circuit current flowing through the bypass switch of the converter valve submodule.
3. The method for suppressing short-circuit rush current of a bypass switch of a converter valve submodule according to claim 2, wherein determining an original parasitic inductance value of the bypass switch according to an original magnetic field strength and an original relative permeability corresponding to a short-circuit current flowing through the bypass switch of the converter valve submodule includes: determining corresponding original magnetic induction intensity according to the vacuum magnetic permeability, the original relative magnetic permeability and the original magnetic field intensity; integrating the product of the original magnetic field intensity and the original magnetic induction intensity to obtain original magnetic field energy stored in a bypass switch space region; And determining the original parasitic inductance value according to the original magnetic field energy and the short-circuit current.
4. The method for suppressing a short-circuit rush current of a bypass switch of a converter valve sub-module according to claim 1, wherein determining a current parasitic inductance value of the bypass switch according to a current magnetic field strength and a relative permeability corresponding to a short-circuit current flowing through the bypass switch of the converter valve sub-module comprises: Determining corresponding first magnetic induction intensity according to the vacuum magnetic permeability, the first space range, the relative magnetic permeability of the space magnetic ring structure and the current magnetic field intensity; determining a corresponding second magnetic induction intensity according to the vacuum magnetic permeability, the second space range and the current magnetic field intensity; determining the current magnetic field energy stored in the bypass switch space region according to the first magnetic induction intensity and the second magnetic induction intensity; And determining the current parasitic inductance value according to the current magnetic field energy and the short-circuit current.
5. The method for suppressing a short-circuit rush current of a bypass switch of a converter valve submodule according to claim 1, wherein the determining a short-circuit current peak value according to the present parasitic inductance value includes: Determining the total parasitic inductance value of a short circuit loop by using the parasitic inductance value of an insulated gate bipolar transistor loop in a converter valve submodule, the parasitic inductance value of an upper bridge arm device after short circuit breakdown occurs, and the current parasitic inductance value; And determining the short-circuit current peak value according to the direct-current bus voltage value, the capacitor direct-current capacitance value and the total parasitic inductance value of the converter valve sub-module.
6. The converter valve submodule bypass switch short-circuit rush current suppression method of claim 2, wherein the step of predetermining the threshold range includes: and determining the threshold range according to the DC bus voltage value, the capacitor DC capacitance value and the original parasitic inductance value of the converter valve submodule.
7. A converter valve submodule bypass switch short-circuit surge current suppression device, comprising: the current parasitic inductance determining unit is used for determining the current parasitic inductance value of the bypass switch according to the current magnetic field intensity and the relative magnetic permeability corresponding to the short-circuit current flowing through the bypass switch of the converter valve submodule when the short-circuit fault occurs to the converter valve submodule after the space magnetic ring structure is arranged at the bypass switch of the converter valve submodule; a short-circuit current peak value determining unit, configured to determine a short-circuit current peak value according to the current parasitic inductance value; and the surge current suppression unit is used for judging that the bypass switch of the converter valve submodule is suppressed in short-circuit surge current if the short-circuit current peak value meets a predetermined threshold range.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method for suppressing a shunt switch short-circuit rush current of a converter valve submodule according to any one of claims 1 to 6 when said program is executed by said processor.
9. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method for suppressing a shunt switch short-circuit impact current of a converter valve submodule according to any one of claims 1 to 6.
10. A computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the method for suppressing a shunt switch short-circuit impact current of a converter valve submodule according to any one of claims 1 to 6.

Description

Method and device for inhibiting short-circuit impact current of bypass switch of converter valve submodule Technical Field The application relates to the field of power equipment maintenance, in particular to a method and a device for inhibiting short-circuit impact current of a bypass switch of a converter valve submodule. Background When the converter valve submodule has a short-circuit fault, a bypass signal is triggered to close a bypass switch. After the bypass switch is closed, the direct-current capacitor of the converter valve submodule discharges through a loop of the bypass switch, and the discharge current can reach hundreds of kiloamperes or more, so that great current impact is caused to the direct-current capacitor, the bypass switch mechanism and the power electronic device. It is necessary to suppress the short-circuit impact current amplitude by technical means and reduce the damage to bypass switches and other devices. In the prior art, the lifting of the bypass switch main contact is mainly realized by adopting a mode of lifting the mechanical strength of the main contact or increasing the mechanical strength of the peripheral structure of the main contact, so that the cost is high, and the mechanical impact of short-circuit current on the main contact cannot be reduced. This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section. Disclosure of Invention Aiming at the problems in the prior art, the application provides a method and a device for inhibiting the bypass switch short-circuit impact current of a converter valve submodule, which can reduce the influence on a main contact by reducing the peak value of the short-circuit current and the short-circuit electrodynamic force. In order to solve the technical problems, the application provides the following technical scheme: in a first aspect, the present application provides a method for suppressing short-circuit impact current of a bypass switch of a converter valve submodule, including: After a space magnetic ring structure is arranged at a bypass switch of a converter valve submodule, determining a current parasitic inductance value of the bypass switch according to the current magnetic field intensity and relative magnetic permeability corresponding to the short-circuit current flowing through the bypass switch of the converter valve submodule when the short-circuit fault occurs to the converter valve submodule; determining a short-circuit current peak value according to the current parasitic inductance value; And if the short-circuit current peak value meets a predetermined threshold range, judging that the bypass switch of the converter valve submodule is inhibited from short-circuit impact current. Further, the method for inhibiting the short-circuit impact current of the bypass switch of the converter valve submodule further comprises the following steps: Before a space magnetic ring structure is arranged at a bypass switch of a converter valve submodule, determining an original parasitic inductance value of the bypass switch according to original magnetic field intensity and original relative magnetic permeability corresponding to short-circuit current flowing through the bypass switch of the converter valve submodule when the converter valve submodule has short-circuit fault. Further, when the short-circuit fault occurs according to the converter valve submodule, determining an original parasitic inductance value of the bypass switch according to an original magnetic field strength and an original relative magnetic permeability corresponding to a short-circuit current flowing through the bypass switch of the converter valve submodule, including: determining corresponding original magnetic induction intensity according to the vacuum magnetic permeability, the original relative magnetic permeability and the original magnetic field intensity; integrating the product of the original magnetic field intensity and the original magnetic induction intensity to obtain original magnetic field energy stored in a bypass switch space region; And determining the original parasitic inductance value according to the original magnetic field energy and the short-circuit current. Further, when the short-circuit fault occurs according to the converter valve submodule, determining the current parasitic inductance value of the bypass switch according to the current magnetic field intensity and the relative magnetic permeability corresponding to the short-circuit current flowing through the bypass switch of the converter valve submodule includes: Determining corresponding first magnetic induction intensity according to the vacuum magnetic permeability, the first space range, the relative magnetic permeability of the space magnetic ring structure and the current magnetic field intensity; determining a