A structure for controlling the vibration of the converter valve tower

Abstract

The invention relates to a structure for controlling vibration of a converter valve tower. The structure comprises a suspension insulator, suspension springs and tension insulators. One end of the suspension insulator is connected with the top end of the converter valve tower. The other end of the suspension insulator is connected with a valve hall through the suspension springs. The bottom of the converter valve tower is in inclined connection with the ground through the tension insulators. Compared with the prior art, the structure has the advantages that the limitation method of connecting the bottom of the converter valve tower with the ground through the tension insulators is provided, and the vertical springs are arranged on the top of a converter valve. The tension insulators are used for electrical insulation of the converter valve and act in limitation. The vertical springs at the top are used for preventing slim insulators at the top layer from losing stability under a vertical earthquake. The structure is featured by no influence on the electrical function of a device and good limitation effect, is applicable to high-pressure and ultra-high-pressure converter valves in a high-earthquake-intensity area and has the effect of reducing the horizontal displacement and vertical acceleration response of the converter valve and protecting the expensive electrical device.

Description

technical field [0001] The invention relates to the technical field of converter equipment, in particular to a structure for controlling the vibration of a converter valve tower. Background technique [0002] With the development of high-voltage direct current transmission technology, direct current transmission has played a huge role in the composition of China's power grid, especially in the "west-to-east power transmission". As a power source, the southwest region is in an earthquake-prone zone, and the safety of related power equipment under earthquakes needs to be paid attention to. The converter valve is one of the most important equipments in EHV and UHV DC transmission systems. The anti-seismic performance of the converter valve under earthquake is the key to ensure the safe and reliable operation of the transmission system. The converter valve is expensive, and the price of the converter valve in the complete equipment of the converter station accounts for about 25...

AI Technical Summary

Problems solved by technology

However, because the horizontal stiffness of the valve tower itself is too small, if the ground input seismic wave has rich low-frequency components, the horizontal displacement of the valve tower under the action of the earthquake can exceed 1m, which may cause damage to the fittings connected to the valve tower in the valve hall

There are many devices in the valve hall and the coupling relationship between each device is complicated. The huge horizontal displacement of the valve tower in the UHV converter valve hall may cause insulation problems of the electrical equipment in the valve hall and endanger the safe operation of the entire converter station.

Since there is still no reliable technology for the UHV converter station to cut off the power supply in time before the earthquake wave arrives, it is necessary to ensure that the converter valve does not have excessive displacement under the action of the earthquake to prevent flashover in the valve hall

In addition, because the slenderness ratio of the suspension insulator is too large, it may buckle under compression under the action of a vertical earthquake, which will cause an instantaneous impact on the valve tower in the vertical direction, resulting in a huge vertical acceleration response and stress response

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