CN-121984336-A - Converter valve submodule protection assembly, device and method based on hardware overvoltage action

CN121984336ACN 121984336 ACN121984336 ACN 121984336ACN-121984336-A

Abstract

The application provides a converter valve submodule protection component, a device and a method based on hardware overvoltage action, which relate to the field of power equipment maintenance and comprise a bypass switch, an action coil and a discharge gap connected between a high-voltage end of the bypass switch and a high-voltage end of the action coil; when the capacitor voltage of the power module of the converter valve submodule reaches the action voltage of the discharge gap, the discharge gap is conducted to drive the bypass switch to be closed. The application can be based on a pure hardware protection device, and can be used as a backup protection mechanism to realize the effective closing of the bypass switch under the condition that the control system does not normally send the bypass closing signal.

Inventors

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

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 protection assembly of a converter valve submodule based on hardware overvoltage action is characterized by comprising a bypass switch, an action coil and a discharge gap connected between a high-voltage end of the bypass switch and a high-voltage end of the action coil, wherein when the capacitor voltage of a power module of the converter valve submodule reaches the action voltage of the discharge gap, the discharge gap is conducted, and the bypass switch is switched on.
2. The protection assembly of a converter valve submodule based on hardware overvoltage actions according to claim 1, further comprising an energy storage capacitor and a bypass trigger switch, wherein when the bypass trigger switch receives a bypass switch-on signal, the energy storage capacitor discharges the action coil, and the bypass switch is switched on.
3. The protection assembly of claim 1, further comprising a breakover thyristor, wherein if the power module capacitor voltage reaches the operating voltage and the discharge gap is not normally on, the breakover thyristor breaks down after the charging current reaches the breakdown voltage of the breakover thyristor.
4. A converter valve submodule protection device based on hardware overvoltage actions, which is characterized by comprising an upper bridge arm, a lower bridge arm and the converter valve submodule protection assembly according to any one of claims 1 to 3; Wherein, the first end of the converter valve submodule protection component is connected with the low-voltage end of the upper bridge arm, the second end is connected with the high-voltage end of the lower bridge arm.
5. The converter valve submodule protection method based on the hardware overvoltage action is applied to the converter valve submodule protection device based on the hardware overvoltage action as claimed in claim 4, and is characterized by comprising the following steps: If the bypass trigger switch receives a bypass switching-on signal sent by an external control system, the energy storage capacitor discharges the action coil to enable the bypass switch to be switched on; If the bypass trigger switch does not receive a bypass switching-on signal sent by an external control system and the capacitor voltage of the power module reaches the action voltage of a discharge gap, the discharge gap is conducted, so that the bypass switch is switched on; If the capacitor voltage of the power module reaches the action voltage and the discharge gap is not normally conducted, the turning thyristor is broken down after the charging current reaches the breakdown voltage of the turning thyristor, so that the bypass of the converter valve submodule is realized.
6. The protection method for a converter valve submodule based on hardware overvoltage action according to claim 5, wherein if the bypass trigger switch receives a bypass switch-on signal sent by an external control system, the energy storage capacitor discharges the action coil to switch on the bypass switch, and the method comprises: if the bypass trigger switch receives a bypass switching-on signal sent by an external control system, the energy storage capacitor discharges the action coil to form a first discharge current; And the action coil generates electromagnetic force under the action of the first discharging current so as to drive the bypass switch to be switched on.
7. The method for protecting a converter valve submodule based on hardware overvoltage action according to claim 5, wherein if the bypass trigger switch does not receive a bypass switch-on signal sent by an external control system and the capacitor voltage of the power module reaches the action voltage of a discharge gap, the discharge gap is turned on to drive the bypass switch to switch on, the method comprises: If the bypass trigger switch does not receive the bypass switching-on signal sent by the external control system, the bypass switch does not act, and the bridge arm capacitor is continuously charged; When the capacitor voltage of the power module reaches the action voltage of the discharge gap, the discharge gap is conducted to form a second discharge current; and the action coil generates electromagnetic force under the action of the second discharging current so as to drive the bypass switch to be switched on.
8. The method of claim 5, wherein if the capacitor voltage of the power module reaches the operating voltage and the discharge gap is not normally turned on, the turning thyristor is broken down after the charging current reaches the breakdown voltage of the turning thyristor, so as to realize a bypass of the converter valve submodule, comprising: If the capacitor voltage of the power module reaches the action voltage of the discharge gap and the discharge gap is not normally conducted, the bypass switch does not act, and the bridge arm capacitor is continuously charged; When the power module capacitance voltage reaches the breakdown voltage of the turning thyristor, the turning thyristor is broken down.
9. The method for protecting a converter valve submodule based on hardware overvoltage actions of claim 6, further comprising: And determining a first current peak value of the action coil according to the inductance value of the action coil, the capacitance value and the voltage value of the energy storage capacitor and the first discharge current.
10. The method for protecting a converter valve submodule based on hardware overvoltage actions of claim 7, further comprising: and determining a second current peak value of the action coil according to the inductance value of the action coil, the capacitance value and the voltage value of the energy storage capacitor and the second discharge current.

Description

Converter valve submodule protection assembly, device and method based on hardware overvoltage action Technical Field The application relates to the field of power equipment maintenance, in particular to a converter valve submodule protection component, a device and a method based on hardware overvoltage actions. Background When the converter valve submodule detects a short-circuit fault, a bypass closing signal is triggered to close the bypass switch. Existing bypass switches are implemented by means of an external triggering device. If the external trigger device fails or the bypass closing signal is abnormal, the bypass switch cannot be closed, and the safety operation of the converter valve is influenced. At present, although part of the converter valve submodules are provided with turning thyristors, the turning thyristors are irreversibly damaged after being operated. 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 converter valve submodule protection component, a device and a method based on hardware overvoltage action, which can be used as a backup protection mechanism to realize effective closing of a bypass switch based on a pure hardware protection device under the condition that a control system does not normally send a bypass closing signal. In order to solve the technical problems, the application provides the following technical scheme: In a first aspect, the application provides a converter valve submodule protection assembly based on hardware overvoltage action, which comprises a bypass switch, an action coil and a discharge gap connected between a high-voltage end of the bypass switch and a high-voltage end of the action coil, wherein when the capacitor voltage of a power module of the converter valve submodule reaches the action voltage of the discharge gap, the discharge gap is conducted to drive the bypass switch to be closed. Further, the protection assembly of the converter valve submodule based on the hardware overvoltage action further comprises an energy storage capacitor and a bypass trigger switch, wherein when the bypass trigger switch receives a bypass closing signal of an external control system, the energy storage capacitor discharges the action coil so that the action coil drives the bypass switch to close. Further, the converter valve submodule protection component based on the hardware overvoltage action further comprises a turning thyristor, wherein if the capacitor voltage of the power module reaches the action voltage and the discharge gap is not normally conducted, the turning thyristor is broken down after the charging current reaches the breakdown voltage of the turning thyristor. The application provides a converter valve submodule protection device based on hardware overvoltage action, which comprises an upper bridge arm, a lower bridge arm and a bypass protection assembly; wherein, the first end of the bypass protection component is connected with the low-voltage end of the upper bridge arm, the second end is connected with the high-voltage end of the lower bridge arm. In a third aspect, the present application provides a protection method for a converter valve submodule based on a hardware overvoltage action, which is applied to the protection device for the converter valve submodule based on the hardware overvoltage action, and includes: If the bypass trigger switch receives a bypass switching-on signal sent by an external control system, the energy storage capacitor discharges the action coil so as to drive the bypass switch to switch on; If the bypass trigger switch does not receive a bypass switching-on signal sent by an external control system and the capacitor voltage of the power module reaches the action voltage of a discharge gap, the discharge gap is conducted so as to drive the bypass switch to switch on; If the capacitor voltage of the power module reaches the action voltage and the discharge gap is not normally conducted, the turning thyristor is broken down after the charging current reaches the breakdown voltage of the turning thyristor, so that the bypass of the converter valve submodule is realized. Further, if the bypass trigger switch receives a bypass switch-on signal sent by an external control system, the energy storage capacitor discharges the action coil to drive the bypass switch to switch on, including: if the bypass trigger switch receives a bypass switching-on signal sent by an external control system, the energy storage capacitor discharges the action coil to form a first discharge current; And the action coil generates electromagnetic force under the action of the first discharging current so as to drive the bypass switch to be switched on. Further, if the bypass trigger switch doe