CN-122014799-A - Suspension type converter valve rod type damping device and design method

CN122014799ACN 122014799 ACN122014799 ACN 122014799ACN-122014799-A

Abstract

The invention provides a suspension type converter valve rod type damping device and a design method, wherein the suspension type converter valve rod type damping device comprises at least two rod type dampers which are obliquely arranged in two intersected vertical installation surfaces respectively, two ends of each rod type damper are hinged with a top steel structure of a converter valve hall and a lower flange of a suspension insulator at the top of the converter valve respectively, the rod type dampers are obliquely arranged in a vertical installation plane between the top steel structure and the lower flange of the suspension insulator, the original equipment structure of the suspension type converter valve is not changed, normal operation of equipment and inspection operation of a trolley below the converter valve are not influenced, process layout in the valve hall is not damaged, other adjacent electric facilities are not interfered, and the method has strong engineering feasibility.

Inventors

LIN SEN
LIU ZHENLIN
MENG XIANZHENG
SUN YUHAN
LU ZHICHENG

Assignees

国网电力工程研究院有限公司
中国电力科学研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20241108

Claims (12)

1. The suspension type converter valve rod type damping device is characterized by comprising at least two rod type dampers (3) which are obliquely arranged in two intersected vertical mounting surfaces respectively; two ends of the rod type shock absorber (3) are hinged with a top steel structure (4) of the converter valve hall and a lower flange of a suspension insulator (2) at the top of the converter valve (1) respectively.
2. A suspension type converter valve rod type damping device according to claim 1, wherein the vertical installation surface comprises a rectangular plane surrounded by two adjacent suspension insulators (2) at the top of the converter valve (1), and the rod type damper (3) is obliquely arranged on the diagonal line of the rectangular plane.
3. A suspension converter valve stem damping device according to claim 2, characterized in that the number of rod dampers (3) is the same as the number of rectangular planes.
4. A suspension type converter valve stem type damper apparatus as claimed in claim 3, wherein the inclination directions of said rod type dampers (3) in adjacent two of said rectangular planes are different.
5. A suspension type converter valve rod type damping device according to claim 1, wherein the rod type damper (3) comprises an outer cylinder (3-1), two force transmission shafts (3-2) respectively inserted at two ends of the outer cylinder (3-1), and a viscoelastic energy dissipation cylinder (3-3) connected between the outer wall of the force transmission shaft (3-2) and the inner wall of the outer cylinder (3-1).
6. A suspension converter valve stem damping device according to claim 5, characterized in that the end of the force transmission shaft (3-2) extending out of the outer cylinder (3-1) is hinged to the top steel structure (4) or to the lower flange of the suspension insulator (2) by means of a spherical hinge connection (5).
7. A suspension converter valve stem damping device according to claim 5, characterized in that an anti-drop mechanism is provided in the outer cylinder (3-1) for preventing the force transmission shaft (3-2) from falling out of the outer cylinder (3-1).
8. A suspension converter valve stem damping device according to claim 7, characterized in that the anti-disengaging means comprises a wire (3-4) connected between two of the force transmission shafts (3-2).
9. A design method of a suspension type converter valve rod type damping device is characterized by comprising the following steps: determining an initial yield force and an initial damping coefficient of a rod type shock absorber (3) in the shock absorbing device based on the dead weight and the natural frequency of the converter valve (1); Determining an initial model of the rod-type shock absorber (3) and mechanical parameters corresponding to the initial model according to the initial yield force and the initial damping coefficient; inputting mechanical parameters corresponding to the initial model into a pre-constructed finite element simulation model of a converter valve damping structure, and performing simulation calculation under the earthquake motion time course to obtain a damping result of the initial model; Judging whether the damping result of the initial model meets the set damping requirement, if yes, outputting the initial model to complete the design of the damping device, and if not, re-selecting the model of the rod type damper (3) according to the damping result of the initial model until the selected rod type damper (3) meets the set damping requirement to complete the design of the damping device; the finite element simulation model of the converter valve damping structure is constructed according to the installation and connection structure of the converter valve and the damping device, and the damping device adopts the damping device as set forth in any one of claims 1-6.
10. A method of designing a suspension type converter valve stem type damper according to claim 9, wherein the sum of the initial yield forces of the rod type dampers (3) in all of said damper is 1/2 to 4/5 of the dead weight of said converter valve.
11. A method of designing a suspension converter valve stem shock absorber as defined in claim 9, wherein said initial damping coefficient is determined according to the formula: c=mω n ξ/2; Wherein c is an initial damping coefficient, m is the dead weight of the converter valve, omega n is the natural frequency of the converter valve, xi is the damping ratio of the damping structure of the converter valve, and the damping ratio of the damping structure of the converter valve is in the range of 0.03-0.08.
12. A method of designing a suspension type converter valve stem shock absorber as defined in claim 9, wherein said determining mechanical parameters corresponding to an initial model of a rod shock absorber (3) in said shock absorber based on said initial yield force and said initial damping coefficient comprises: Determining initial mechanical parameters of the rod type shock absorber (3) according to an approximate calculation formula of the initial damping coefficient; determining an initial model of the rod-type shock absorber (3) and mechanical parameters corresponding to the initial model according to the initial yield force and the initial mechanical parameters; Wherein the approximate calculation formula is expressed as: Wherein c is an initial damping coefficient, G' is a shear loss modulus, A is a shear area of the viscoelastic energy dissipation cylinder (3-3), T g is a field characteristic period, h is a wall thickness of the viscoelastic energy dissipation cylinder (3-3), and pi is a circumference ratio.

Description

Suspension type converter valve rod type damping device and design method Technical Field The invention belongs to the technical field of vibration resistance of electric power facilities, and particularly relates to a suspension type converter valve rod type damping device and a design method. Background The converter valve is one of the most important electrical equipment in a converter station, is used for realizing alternating current-direct current and direct current-alternating current conversion, and has the core functions of rectification, inversion and the like. The conventional extra-high voltage direct current power transmission and transformation engineering adopts a suspension type converter valve, and because of adopting a suspension structure mode, the self-vibration period of equipment is longer, the displacement is larger under the action of earthquake, the displacement of a valve tower easily exceeds the design limit value, other important equipment (such as converter transformer) interconnected with the valve tower is pulled, and the interaction force between the equipment can cause the damage of the converter valve and the interconnection equipment thereof in severe cases. Due to regional terrain limitations, many converter stations and substations are inevitably built in strong seismic areas, facing a significant risk of earthquake disasters. The damage condition of electric facilities in the medium-rise earthquake is serious, and the earthquake relief and social life are seriously affected besides huge economic loss. In the prior art, in order to cope with the large displacement possibly generated by the suspension converter valve in a high-intensity area, a series of measures are taken for the installation of the suspension converter valve, such as applying spring damping devices to the bottom and the top of the suspension converter valve as limiting measures, arranging a spring stay rope device at the bottom of the device to limit the horizontal displacement of a valve tower, and using a tension insulator and a spring-damper connecting piece to pull the bottom of the valve tower and the ground firmly so as to realize the technical scheme of controlling the displacement of the converter valve. That is, the existing suspension type converter valve damping device mainly adopts a suspension spring damping device arranged at the top of the valve tower or a damping device arranged between the bottom of the valve tower and the ground, however, the existing technical scheme cannot be applied in actual engineering. The main reason is that the suspension spring damping device is arranged at the top of the valve tower to increase the height of the valve hall and change the structural design of the valve hall, and the mode of the ground tie shock absorber occupies the space of the valve hall too much, so that other nearby electric facilities are easily affected by interference, and in addition, the inspection of equipment by the inspection trolley in the valve hall is also affected. Therefore, aiming at the problems in the prior art, how to effectively control the earthquake displacement of the converter valve is a technical problem to be solved under the premise of not changing the structural design of the valve hall and the converter valve and not affecting the electrical function and operation maintenance of the equipment in normal operation and not interfering with other adjacent electric facilities. Disclosure of Invention In order to overcome the defect that the damping device in the prior art affects the normal operation and maintenance of a converter valve, the invention provides a suspension type converter valve rod type damping device, which comprises at least two rod type dampers, a plurality of damping rods and a plurality of damping rods, wherein the at least two rod type dampers are obliquely arranged in two crossed vertical mounting surfaces respectively; and two ends of the rod type shock absorber are respectively hinged with a steel structure at the top of the converter valve hall and a lower flange of a suspension insulator at the top of the converter valve. Preferably, the vertical mounting surface comprises a rectangular plane surrounded by two adjacent suspension insulators at the top of the converter valve, and the rod type shock absorbers are obliquely arranged on the diagonal line of the rectangular plane. Preferably, the number of rod-type dampers is the same as the number of rectangular planes. Preferably, the rod-type dampers in the adjacent two rectangular planes have different inclination directions. Preferably, the rod-type shock absorber comprises an outer cylinder, two force transmission shafts respectively inserted at two ends of the outer cylinder, and a viscoelastic energy consumption cylinder connected between the outer wall of the force transmission shaft and the inner wall of the outer cylinder. Preferably, one end of the force transmission shaft extending o