Thyristor converter valve reliability evaluation method of considering operating state

A thyristor converter valve, operating state technology, applied in computing, special data processing applications, instruments, etc., can solve the problem of long-term average characteristics regardless of actual operating state differences, and achieve the effect of improving accuracy

Active Publication Date: 2016-01-13
XI AN JIAOTONG UNIV +3
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for evaluating the reliability of thyristor converter valves considering the operating state, aiming to solve the problem that the reliability evaluation of existing converter valves only takes into account the long-term average characteristics without considering the differences in actual operating states, and improves Accuracy of reliability evaluation of converter valves, thereby improving the engineering practicability of reliability evaluation of HVDC transmission systems

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  • Thyristor converter valve reliability evaluation method of considering operating state
  • Thyristor converter valve reliability evaluation method of considering operating state
  • Thyristor converter valve reliability evaluation method of considering operating state

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the drawings and embodiments.

[0024] 1. Temperature field model of thyristor

[0025] The structure of the thyristor is generally a cylindrical button shape. In the present invention, for the convenience of calculation, the thyristor is approximated as a cylinder, such as figure 1 Shown. According to Fourier's law of heat transfer:

[0026] ( - λ d T d r ) ( 2 π r Δ x ) = ( I πR 2 πr 2 ) 2 ρ Δ x πr 2 - - - ( 1 )

[0027] Among them, r is the distance from any point in the thyristor to the center line of the thyristor, ρ is the equivalent resistivity of the thyristor, R is the thyristor radius, Δx is the length of the selected thyristor slice, λ is the thermal conductivity of the thyristor, I is the current through the thyristor, I can be obtained from the operating power and voltage in combination wi...

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Abstract

The invention provides a thyristor converter valve reliability evaluation method of considering an operating state. A temperature field model of a thyristor is built on the basis of the fourier heat transfer law; and a formula for the temperature and the fault rate of the thyristor is provided, so that a thyristor reliability model on the basis of the operating state is built. A converter valve reliability evaluation method of considering the operating state is provided by a state partition principle. According to the method, the operating state of the system is considered in the converter valve reliability evaluation; the defect that the actual operating state cannot be considered in the existing converter valve reliability evaluation is overcome; the thyristor-based converter valve reliability evaluation accuracy can be effectively improved; and a relatively reliable basis is provided for planning and operating of a high-voltage direct-current power transmission system.

Description

Technical field [0001] The invention belongs to the field of power system reliability evaluation, and in particular relates to a method for evaluating the reliability of a thyristor converter valve in consideration of operating conditions. Background technique [0002] Currently, there are two types of power transmission methods that are actually used: AC transmission and DC transmission. AC transmission technology is relatively mature, flexible and convenient in operation, and in most cases investment is low, so AC transmission technology occupies the dominant position in the current power system. However, the stability problems of (ultra / ultra) high voltage AC transmission in large power grids and the capacitive current problem of AC cables in submarine transmission make it difficult for AC transmission technology to be applied to specific transmission occasions. As an important supplement to the current power grid, HVDC technology has broad application prospects in the fields...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 别朝红谢海鹏何剑云雷易俊汤涌
Owner XI AN JIAOTONG UNIV
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