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Evaluation method and system for pressure equalization capacity of pressure equalization electrode in internal cooling system of converter valve

A technology of equalizing electrodes and converter valves, applied in AC network circuits, circuit devices, power transmission AC networks, etc., can solve problems such as valve tower component damage, DC system blocking, etc., to ensure stable operation and evaluation. The effect of pressure

Active Publication Date: 2020-08-07
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scaling of voltage equalizing electrodes is a common phenomenon in DC transmission projects, and in actual operation, there have been many times in actual operation that the valve tower components have been damaged due to electrode scaling, resulting in DC system blocking

Method used

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  • Evaluation method and system for pressure equalization capacity of pressure equalization electrode in internal cooling system of converter valve
  • Evaluation method and system for pressure equalization capacity of pressure equalization electrode in internal cooling system of converter valve
  • Evaluation method and system for pressure equalization capacity of pressure equalization electrode in internal cooling system of converter valve

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Experimental program
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Effect test

Embodiment 1

[0049] This embodiment provides a method for evaluating the pressure equalization ability of the pressure equalization electrode of the internal cooling system of the converter valve, such as figure 1 As shown, including the following steps:

[0050] 1) For a converter station of a certain voltage level, establish a physical model of the internal cooling system of the low-pressure side converter valve;

[0051] 2) Convert the physical model of the valve layer internal cooling system to the equivalent circuit model of the valve cooling system, and calculate the leakage current value calculated when the equalizing electrodes are not scaled and the internal cooling water conductivity is 0.5μS / cm. ;

[0052] 3) Calculate the corrosion of the radiator and the scaling of the equalizing electrode by the electric field-flow field calculation method, and analyze the scaling thickness and the scaling shape of the equalizing electrode after the converter valve is operated for different operati...

Embodiment 2

[0075] This embodiment provides an evaluation system for the pressure equalization ability of the pressure equalization electrode of the converter valve internal cooling system, which includes:

[0076] Physical model construction unit: For a converter station of a certain voltage level, establish a physical model of the internal cooling system of the low-pressure side converter valve;

[0077] Transformation unit: Transform the physical model of the internal cooling system of the valve layer into an equivalent circuit model of the valve cooling system;

[0078] The first leakage current value calculation unit: calculate the leakage current value calculated when each voltage equalizing electrode is not fouled and the internal cold water conductivity is 0.5μS / cm;

[0079] Analysis unit: Calculate radiator corrosion and equalization electrode fouling through the electric field-flow field calculation method, and analyze the fouling thickness and fouling shape of the equalization electrode...

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Abstract

The invention discloses an assessment method and system for voltage-sharing capability of a voltage-sharing electrode of an internal cooling system of a converter valve. For the problems of water leakage, breakdown and blockage caused by voltage-sharing non-uniformity of the voltage-sharing electrode of an existing converter valve, the assessment method comprises the steps of building an equivalent circuit model of the internal cooling system of the converter valve in combination with internal cooling water quality parameters and water circulating loop geometric parameters by utilizing a physical model of the internal cooling system of a valve layer of the converter valve, and calculating a leakage current value when the voltage-sharing electrode does not have scale; and calculating out cooler corrosion and voltage-sharing electrode scaling rules through electric field-flow field distribution characteristics of a valve cooling system, analyzing scaling thicknesses and scaling shapes ofthe voltage-sharing electrode after different running time of the converter valve, and calculating leakage current values of the voltage-sharing electrode after the different running time according to scaling material characteristic parameters and scaling shape geometric parameters. The assessment method and system has the advantages that the voltage-sharing capability of the voltage-sharing electrode is effectively assessed, the failure time of the voltage-sharing electrode is predicted, and the valve cooling system of the converter valve is ensured to stably run.

Description

Technical field [0001] The invention relates to a technology for evaluating the voltage equalization ability of a voltage equalizing electrode in a direct current transmission system, in particular to an evaluation method and system for the equalizing electrode voltage ability of a converter valve internal cooling system. Background technique [0002] In recent years, China's HVDC power transmission engineering technology has developed rapidly. As of 2017, 27 HVDC power transmission projects have been completed. It is estimated that by 2020, my country will have 30 HVDC power transmission projects, more than 50 converter stations, and a transmission capacity of more than 90,000MW. [0003] The converter valve is the key equipment of the DC transmission system. However, the operating experience shows that the corrosion and fouling in the valve cooling system of the converter station are serious, which has caused many component damage and outage accidents. For example, the valve has r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/04G06Q10/06G06Q50/06H02J3/36
CPCG06Q10/04G06Q10/0639G06Q50/06H02J3/36H02J2203/20Y02A20/152Y02E60/60
Inventor 明菊兰宋小宁程一杰于志勇金东春胡家元杨帆高兵贺婷婷
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY