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A key equipment failure risk assessment method for improving the reliability of the converter valve

A technology of key equipment and failure risk, applied in the field of electric power engineering, can solve problems such as studying converter valves without failure, and achieve the effects of improving reliability, reasonable and comprehensive evaluation methods, and accurate risk evaluation results.

Active Publication Date: 2020-11-13
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the industry has not studied the key components of the converter valve from the perspective of how to avoid failures

Method used

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  • A key equipment failure risk assessment method for improving the reliability of the converter valve
  • A key equipment failure risk assessment method for improving the reliability of the converter valve
  • A key equipment failure risk assessment method for improving the reliability of the converter valve

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Embodiment

[0041] figure 1 The HVDC system topology shown. In the high-voltage direct current transmission system, both the rectifier and the inverter use the semi-controlled device thyristor as the commutation unit. During operation, the rectifier station converts AC power into DC power, and then transmits it to the receiving end through the DC transmission line. The receiving inverter station converts the DC side power into AC power and transmits it to the local AC and power grid.

[0042] Converter valve is the core equipment of HVDC transmission system. The structure of the converter valve is relatively complex and expensive. The converter valve is composed of several key equipment and devices such as thyristors, resistors, capacitors, drive boards and insulating materials. Failure and damage of any one device may lead to damage or outage of the entire converter valve equipment, resulting in reduced reliability of the converter valve. The electrical characteristics of specific de...

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Abstract

The invention discloses a key device fault risk assessment method used for improving the reliability of a converter valve. The method aims to improve the reliability of the high-voltage direct-currentpower transmission converter valve. According to the method, a key device of the converter valve is assessed in two aspects of running characteristic and running environment parameters of a system; arunning electrical parameter of the device is obtained through electromagnetic transient analysis of the system; and a device running environment corresponding to a specific running parameter is obtained through finite element analysis. The fault risk of long-time running of the device is assessed through the running parameter and the environment parameter of the device in a steady-state condition; the transient fault risk in an extreme condition of the device is assessed through the running parameter and the environment parameter of the device in a transient running condition, and based on this, the maintenance and optimization upgrading of the converter valve are guided, so that the fault rate and the stop risk of the converter valve are reduced and the reliability of the converter valve is improved; and therefore, the method has relatively high practicality and economy.

Description

technical field [0001] The invention relates to the technical field of electric power engineering, in particular to a key equipment failure risk assessment method for improving the reliability of a converter valve. Background technique [0002] Thyristor-based high-voltage direct current transmission system has obvious advantages in long-distance large-capacity power transmission and grid interconnection due to its mature technology, low loss and low cost. Due to the characteristics of my country's unbalanced energy distribution and large differences in economic development levels, high-voltage direct current transmission technology plays an important role in my country's "west-to-east power transmission, national networking" strategy. In recent years, a number of high-voltage direct current transmission lines have been put into operation in my country, and with the trend of economic development and energy structure transformation, the number of direct current transmission l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06Q10/06G06Q50/06
CPCG06F30/23G06Q10/0635G06Q50/06Y04S10/50
Inventor 梁宁王丰卓放唐金昆刘翠勾雅婷
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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