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Converter valve sub-module controller and driving fault discrimination method

A technology for fault identification and sub-modules, which is applied in the direction of instruments, power transmission AC networks, measurement devices, etc., can solve problems such as false alarms of sub-module controller drive faults, and achieve the effect of improving reliability and reducing the risk of system outages

Active Publication Date: 2019-03-29
XUJI GRP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a converter valve sub-module controller and a driving fault discrimination method, which is used to solve the problem that the driving device easily misdetects the IGBT driving fault in a high-voltage and strong magnetic environment, which causes the sub-module controller to generate false alarms of driving faults The problem

Method used

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  • Converter valve sub-module controller and driving fault discrimination method

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Embodiment 1

[0018] The method of this embodiment performs comprehensive judgment based on the driving feedback signal and the sub-module capacitor voltage, and is a driving fault discrimination and optimization judgment method. The flow chart is as follows figure 1 As shown, the steps are as follows:

[0019] 1. The sub-module controller receives the drive feedback signal and judges whether the drive feedback signal is abnormal: if the drive feedback signal is abnormal, set the drive fault prediction signal to be valid; if the drive feedback signal is normal, then perform step 1 again .

[0020] 2. After the drive fault prediction signal is valid, the sub-module controller issues an IGBT lock command to avoid fault expansion; at the same time, the sub-module controller records the sub-module capacitor voltage V0 at the current moment.

[0021] 3. The sub-module controller starts timing, and the timing duration is the set time T.

[0022] 4. Within the set time T, determine whether the s...

Embodiment 2

[0027] The difference from Embodiment 1 is that in this embodiment, the capacitor voltage of the sub-module is no longer used to judge the driving fault of the converter valve sub-module, and the steps are as follows:

[0028] 1. The sub-module controller receives the drive feedback signal and judges whether the drive feedback signal is abnormal: if the drive feedback signal is abnormal, set the drive fault prediction signal to be valid; if the drive feedback signal is normal, perform step 1 again .

[0029] 2. After the drive fault prediction signal is valid, the sub-module controller issues an IGBT lock command to avoid fault expansion; at the same time, the sub-module controller records the sub-module capacitor voltage V0 at the current moment.

[0030] 3. The sub-module controller starts timing, and the timing duration is the set time T.

[0031] 4. When the set time T is up, receive the drive feedback signal again and judge again: if the drive feedback signal received ag...

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Abstract

The invention relates to a converter valve sub-module controller and a driving fault discrimination method. When the received driving feedback signals are abnormal, within a set time, the driving feedback signals are re-received, if the re-received driving feedback signals are abnormal, it is determined that a sub module generates drive fault. When the received driving feedback signals are abnormal, the driving feedback signals are re-received after a period of time, if the re-received driving feedback signals are still abnormal, it is determined that the sub module generates driving faults soas to avoid the misinformation generation that driving feedback signals are only received once to confirm that the sub module generates faults, reduce the risk of system off-stream and improve the reliability of the operation of the flexible direct current transmission converter valve.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission, and in particular relates to a converter valve sub-module controller and a driving fault discrimination method. Background technique [0002] Modular multilevel flexible direct current transmission (MMC-HVDC) is a new generation of direct current transmission technology. Moreover, flexible DC transmission is a DC transmission based on a voltage source, and the voltage polarity of the DC line is constant, so it is very easy to form a multi-terminal DC transmission, so that it can directly supply power to small isolated loads in long-distance, especially passive systems. [0003] The converter valve is the core equipment of the flexible direct current transmission system, and the converter valve is composed of thousands of sub-modules. The number of sub-modules is extremely large, and there are many failure points. In the actual engineering operation, the sub-module I...

Claims

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Application Information

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IPC IPC(8): G01R31/00H02J3/36
CPCG01R31/00H02J3/36Y02E60/60
Inventor 胡四全宣佳卓董朝阳俎立峰王朝亮丁超吉攀攀赵洋洋秦鸿瑜慕小乐王晓丽樊大帅樊宏伟周航裴杰才祁招田兰芳
Owner XUJI GRP
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