Vibration isolation support for a converter valve and a converter valve for a high voltage converter station

Abstract

The application provides a kind of vibration isolation support for converter valve and high-voltage converter station converter valve, and relates to the technical field of power equipment vibration isolation and reduction.The vibration isolation support for converter valve includes: a mounting base, the upper part is connected with the valve base insulator of the converter valve above the vibration isolation, for providing bearing capacity to the converter valve and transmitting load;Vertical vibration isolation component, connected between the lower part of the mounting base and the ground, for providing bearing capacity, and for providing vertical and horizontal vibration isolation capacity to weaken the vibration conducted by the ground to the converter valve;Horizontal vibration isolation component, connected with the side of the mounting base, for providing horizontal vibration isolation capacity to weaken the horizontal vibration conducted by the ground to the converter valve.The application realizes three-degree-of-freedom independent decoupling vibration reduction based on magneto-rheological semi-active control combined with quasi-zero stiffness structure, dynamically adjusts the system damping and overall stiffness, improves the extremely low frequency vibration isolation capacity, and adapts to complex vibration excitation conditions such as earthquakes and sea waves.

Description

Technical Field

[0001] This application relates to the field of vibration reduction and isolation technology for power equipment, and more specifically, to a vibration isolation support for a converter valve and a converter valve for a high-voltage converter station. Background Technology

[0002] In flexible DC and AC transmission systems, the converter valves are constructed using insulator frames to support power submodules. The equipment is heavy, tall, and has low overall structural stiffness. The natural frequencies of the main vibration modes of the equipment often fall within the energy concentration range of earthquakes and wave vibrations, making it highly susceptible to large vibration responses. This can lead to insulator breakage, module loosening, equipment malfunctions, and even structural damage. Therefore, seismic isolation design for valve tower equipment is a core element in ensuring the safe and stable operation of the power grid.

[0003] Existing vibration reduction solutions are mainly divided into three types of vibration isolation systems: passive, active, and semi-active. Passive vibration isolation devices have fixed stiffness and damping parameters, and can only effectively reduce vibrations at preset frequency excitations. They cannot adapt to variable low-frequency vibration conditions such as earthquakes and ocean waves. Active vibration isolation has the best theoretical vibration reduction performance, but its supporting control system is complex, energy-intensive, and has poor equipment stability, making it difficult to adapt to the long-term outdoor operation scenarios of heavy valve tower equipment. Semi-active vibration isolation can adjust vibration reduction parameters in real time, balancing vibration reduction effect, operational reliability, and cost. It is the preferred solution for vibration reduction of power equipment, but its application in the valve tower field is currently very limited.

[0004] Existing vibration isolation devices for power equipment have two major defects: First, the existing vibration reduction structures have insufficient low-frequency suppression capabilities. Valve towers face earthquake and wave excitations with minimum vibration isolation requirements in the extremely low frequency range of 0.1Hz to 1Hz. Conventional spring and rubber vibration reduction structures have high natural frequencies and cannot achieve extremely low frequency vibration isolation. Second, most existing vibration isolation devices are single vertical and unidirectional vibration reduction structures, which cannot adapt to the excitation characteristics of earthquakes, which are mainly horizontal vibrations. They lack an integrated solution for simultaneous vibration reduction in the vertical and dual horizontal directions with three degrees of freedom and independent decoupling control in each direction.

[0005] In summary, existing technologies lack integrated vibration isolation supports for converter valves that are compatible with valve tower equipment and can achieve three-degree-of-freedom ultra-low frequency semi-active adjustable vibration reduction. Summary of the Invention

[0006] To address the shortcomings of existing technologies, such as poor low-frequency vibration reduction, single-axial vibration reduction, inability to achieve multi-directional decoupling control, and weak adaptability to operating conditions, this application provides a vibration isolation support for converter valves and a converter valve for high-voltage converter stations. Based on magnetorheological semi-active control combined with a quasi-zero stiffness structure, it achieves independent decoupling vibration reduction in three degrees of freedom in the vertical and dual horizontal directions. It can dynamically adjust the system damping and overall stiffness, significantly improving the isolation capability of extremely low-frequency vibrations from 0.1Hz to 1Hz, and is suitable for complex vibration excitation conditions such as earthquakes and ocean waves.

[0007] According to a first aspect of this application, at least one embodiment of this application provides a vibration isolation support for a converter valve, comprising: a mounting base, the upper part of which is connected to a valve base insulator of the converter valve to be isolated above, for providing load-bearing capacity to the converter valve and transmitting load; a vertical vibration isolation assembly connected between the lower part of the mounting base and the ground, for providing load-bearing capacity to the mounting base and for providing vertical and horizontal vibration isolation capabilities to weaken vertical and horizontal vibrations transmitted from the ground to the converter valve; and a horizontal vibration isolation assembly connected to the side of the mounting base for providing horizontal vibration isolation capabilities to weaken horizontal vibrations transmitted from the ground to the converter valve.

[0008] For example, in some embodiments of this application, the mounting base includes: a bearing shell, wherein a secondary bottom spring support is provided on the inner bottom surface of the bearing shell; an upper mounting plate, disposed on the top of the bearing shell, for connection with the valve base support insulator of the converter valve; and a lifting lug, disposed on the side of the upper mounting plate, for connection with the inclined pull insulator of the converter valve.

[0009] For example, in some embodiments of this application, the vertical vibration isolation assembly includes: a lower mounting plate for fixed connection to the ground; a main bottom spring support disposed in the middle region of the lower mounting plate; a first magnetorheological assembly disposed on the inner side enclosed by the main bottom spring support; a rubber support disposed between the top of the first magnetorheological assembly and the bearing shell for transmitting load and providing horizontal vibration isolation capability; and a bottom support spring, with its two ends respectively assembled to the main bottom spring support and the secondary bottom spring support for providing load-bearing capacity, positive stiffness, and vertical vibration isolation capability.

[0010] For example, in some embodiments of this application, the horizontal vibration isolation assembly includes: a side spring support; a mounting housing disposed on the lower mounting plate; a second magnetorheological assembly, which is evenly and alternately arranged with the side spring support inside the mounting housing; a first sliding pad disposed between the second magnetorheological assembly and the side wall of the bearing housing for transmitting horizontal force; a side support spring, one end of which is fitted to the side spring support for transmitting horizontal force and providing positive stiffness; and a second sliding pad disposed between the other end of the side support spring and the side wall of the bearing housing for transmitting horizontal force.

[0011] For example, in some embodiments of this application, both the first magnetorheological component and the second magnetorheological component respectively include: a force transmission component, including: a first force guide plate disposed at the upper part; a third force guide plate disposed at the lower part, the outer edge of the third force guide plate being covered with a sealing ring; a second force guide plate connected between the first force guide plate and the third force guide plate, the first force guide plate, the second force guide plate and the third force guide plate being sequentially hinged for swinging under the action of external force to adjust the support force output by the first force guide plate; and a magnetorheological chamber, including: A shell; a chamber and a flow channel, disposed inside the shell, the flow channel connecting the chamber, the chamber and the flow channel being filled with magnetorheological fluid; a cavity, disposed inside the shell; a sealing piston plate, disposed inside the shell, used to separate the chamber and the cavity; an outer chamber, disposed in the middle of the shell, the third force guide plate extending into the outer chamber and capable of axial piston movement along the inner wall of the outer chamber; an excitation coil, disposed in the shell and surrounding the outer chamber, used to generate a magnetic field to adjust the damping characteristics of the magnetorheological fluid.

[0012] For example, in some embodiments of this application, the rubber support includes: an upper support plate; a lower support plate, both the upper and lower support plates having inner rubber linings; a rubber sheet for providing horizontal vibration isolation; a steel plate, alternately arranged between the upper and lower support plates and the rubber sheet for providing load-bearing capacity; and protective rubber wrapped around the rubber sheet and the steel plate, the inner rubber lining and the protective rubber for protecting the rubber sheet and the steel plate to delay aging.

[0013] For example, in some embodiments of this application, the vertical positive load is transmitted between the mounting base and the vertical vibration isolation component through the rubber support and the bottom support spring; the horizontal compressive load is transmitted between the mounting base and the horizontal vibration isolation component through the first sliding pad and the second sliding pad; the horizontal vibration isolation component is symmetrically arranged, and the horizontal vibration isolation component and the mounting base can withstand bidirectional compressive loads in the first horizontal axis, and the horizontal vibration isolation component and the mounting base can slide relative to each other in the second axis and the third axis, wherein the first horizontal axis, the second axis, and the third axis are orthogonal to each other.

[0014] For example, in some embodiments of this application, when both horizontal directions are orthogonal to each other and have high-level vibration isolation requirements, four sets of the horizontal vibration isolation components are arranged on the four sides of the mounting base; when one of the two horizontal directions is for high-level vibration isolation and the other is for conventional vibration isolation, the mounting base is arranged with two sets of the horizontal vibration isolation components corresponding to the horizontal direction with high-level vibration isolation requirements; when both horizontal directions are for conventional vibration isolation, the mounting base is not provided with the horizontal vibration isolation components.

[0015] For example, in some embodiments of this application, the magnetic field generated by the excitation coil is perpendicular to the flow direction of the magnetorheological fluid. The flowing magnetorheological fluid generates a damping force under the action of the magnetic field, and the damping force is used to impede the piston movement of the third guide plate. The lower mounting plate is provided with a first groove. The mounting housing is provided with a second groove. The first groove and the second groove are used to lay the wires connecting the excitation coil, so as to dynamically adjust the damping force by adjusting the current of the excitation coil.

[0016] For example, in some embodiments of this application, the cavity of the magnetorheological component is filled with gas to generate a thrust on the third guide plate, thereby subjecting the first guide plate to a force in the same direction of its movement, thus giving the magnetorheological component negative stiffness characteristics; the housing of the magnetorheological component is provided with air holes for filling or venting gas into the cavity to adjust the negative stiffness value of the magnetorheological component, so that the negative stiffness of the magnetorheological component matches the positive stiffness provided by the bottom support spring, the side support spring and the rubber support, thereby giving the vibration isolation support for the converter valve a quasi-zero stiffness structure, and completing the dynamic adjustment of the stiffness of the vibration isolation support for the converter valve.

[0017] According to a second aspect of this application, at least one embodiment of this application provides a converter valve for a high-voltage converter station, comprising: a valve tower body; a valve base support insulator; a tie rod insulator; and a vibration isolation support for the converter valve as described in any one of the first aspects. The vibration isolation support for the converter valve is installed at the bottom of the valve tower body, the upper mounting plate of the vibration isolation support for the converter valve is connected to the valve base support insulator, the lifting lug of the vibration isolation support for the converter valve is connected to the tie rod insulator, and the lower mounting plate of the vibration isolation support for the converter valve is fixed to the ground foundation. The converter valve achieves semi-active vibration reduction in three degrees of freedom (vertical, bidirectional, and horizontal) through the vibration isolation support for the converter valve.

[0018] Through the above embodiments, the vibration isolation support for the converter valve provided in this application has at least one of the following beneficial effects: Excellent ultra-low frequency vibration reduction performance: This application forms a quasi-zero stiffness system by matching the controllable negative stiffness of the magnetorheological component with the positive stiffness of the spring and rubber support, which greatly reduces the overall natural frequency of the system and can effectively isolate ultra-low frequency vibrations such as earthquakes and ocean waves of 0.1Hz~1Hz, solving the pain point of low frequency suppression failure of existing vibration reduction devices.

[0019] Three-degree-of-freedom semi-active adjustable vibration damping: It integrates vertical and dual horizontal independent vibration damping structures, and the damping and stiffness can be dynamically adjusted in real time. It belongs to a semi-active control system. Compared with active vibration damping, it has lower energy consumption and more stable and reliable structure. Compared with passive vibration damping, it can adapt to various vibration excitation conditions.

[0020] Multi-directional vibration decoupling design: Relying on the shear flexibility of rubber bearings and the sliding structure of sliding pads, vertical and two horizontal vibration motions are decoupled. Each axial vibration reduction unit is independently stressed and independently controlled, which facilitates the optimization of vibration reduction parameters in different directions.

[0021] It has strong engineering adaptability and good economic efficiency: the overall structure can be directly connected to valve tower valve base support insulators and inclined insulators, and the on-site assembly is convenient; the horizontal vibration isolation components can be flexibly added or removed according to the vibration reduction level requirements, and the equipment can be configured as needed to balance the vibration reduction performance and manufacturing cost.

[0022] Integrated structure: Vertical bearing, vertical vibration reduction, horizontal vibration reduction, adjustable damping, and stiffness adjustment functions are integrated into a single support, eliminating the need for multiple sets of vibration reduction devices, simplifying the vibration reduction layout space at the bottom of the valve tower, and reducing civil engineering installation costs.

[0023] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0024] The above and other objects, features, and advantages of this application will become more apparent from the detailed description of exemplary embodiments with reference to the accompanying drawings. The drawings described below are merely some embodiments of this application and are not intended to limit the scope of this application.

[0025] Figure 1 This is a schematic diagram of the structure of the vibration isolation support for the converter valve according to an embodiment of this application; Figure 2A This is a top-angle view of the mounting base according to an embodiment of this application; Figure 2B This is a top-view structural diagram of the mounting base according to an embodiment of this application; Figure 3 This is a structural diagram of a vertical vibration isolation component according to an embodiment of this application; Figure 4 This is a structural diagram of a horizontal vibration isolation component according to an embodiment of this application; Figure 5 This is a structural diagram of a magnetorheological component according to an embodiment of this application; Figure 6 This is a structural diagram of the force transmission component according to an embodiment of this application; Figure 7 This is a cross-sectional structural diagram of the magnetorheological chamber according to an embodiment of this application; Figure 8 This is a layered structure diagram of the rubber bearing according to an embodiment of this application; Figure 9 This is a schematic diagram illustrating the damping force and air pressure thrust output principle of the magnetorheological chamber in an embodiment of this application. Figure 10 This is a schematic diagram of the quasi-zero stiffness mechanical principle of the magnetorheological component in an embodiment of this application. Detailed Implementation

[0026] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0027] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of these specific details, or other methods, components, materials, devices, etc. In these cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0028] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0029] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0030] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments, and the modules or processes in the drawings are not necessarily essential for implementing this application, and therefore cannot be used to limit the scope of protection of this application.

[0031] Figure 1 This is a schematic diagram of the structure of the vibration isolation support for the converter valve according to an embodiment of this application.

[0032] like Figure 1 As shown, the vibration isolation support for the converter valve includes: a mounting base 1, a vertical vibration isolation component 2, and a horizontal vibration isolation component 3.

[0033] Converter valves include load-bearing insulation structures such as valve base insulators. Their core operational challenge is low-frequency, high-amplitude vibrations caused by earthquakes and ocean waves. Valve base insulators include valve base post insulators and cable-stayed insulators.

[0034] The upper part of the mounting base 1 is connected to the valve base insulator of the converter valve, which is isolated above, to provide load-bearing capacity and transfer load to the converter valve. The vertical vibration isolation assembly 2 is connected between the lower part of the mounting base 1 and the ground, providing load-bearing capacity to the mounting base 1 and providing vertical and horizontal vibration isolation capabilities to weaken vertical and horizontal vibrations transmitted from the ground to the converter valve. The horizontal vibration isolation assembly 3 is connected to the side of the mounting base 1 to provide horizontal vibration isolation capabilities to weaken horizontal vibrations transmitted from the ground to the converter valve.

[0035] like Figure 2A As shown, the mounting base 1 includes: a bearing shell 13, an upper mounting plate 11, and a lifting lug 12.

[0036] The upper mounting plate 11 is located on the top of the bearing shell 13 and is used to connect with the valve base support insulator of the converter valve. The lifting lug 12 is located on the side of the upper mounting plate 11 and is used to connect with the inclined pull insulator of the converter valve.

[0037] like Figure 2B As shown, a secondary bottom spring support 14 is provided on the inner bottom surface of the bearing shell 13.

[0038] According to some embodiments, the secondary bottom spring supports 14 are evenly arranged on the bottom surface of the bearing shell 13, which can evenly distribute the vertical load and avoid local stress concentration.

[0039] like Figure 3 As shown, the vertical vibration isolation assembly 2 includes: a lower mounting plate 21, a main bottom spring support 22, a first magnetorheological assembly 401, a rubber support 23, and a bottom support spring 24.

[0040] The lower mounting plate 21 is used for fixed connection to the ground. The main bottom spring support 22 is located in the middle region of the lower mounting plate 21. The first magnetorheological component 401 is located inside the area enclosed by the main bottom spring support 22. A rubber support 23 is located between the top of the first magnetorheological component 401 and the bearing shell 13, used to transfer loads and provide horizontal vibration isolation. The bottom support spring 24 is respectively mounted at both ends to the main bottom spring support 22 and the secondary bottom spring support 14, used to provide load-bearing capacity, positive stiffness, and vertical vibration isolation.

[0041] According to some embodiments, the lower mounting plate 21 has a first wire groove 211, which is used to lay the connecting wires of the excitation coil of the first magnetorheological component 401 to prevent the line from being worn by vibration.

[0042] According to some embodiments, the lower mounting plate 21 is fixed to the ground foundation by anchor bolts.

[0043] like Figure 8 As shown, the rubber support 23 includes: an upper support plate 231, a lower support plate 232, an inner rubber liner 233, a rubber sheet 234, a steel plate 235, and a protective rubber 236.

[0044] Both the upper support plate 231 and the lower support plate 232 are lined with rubber 233. A rubber sheet 234 provides horizontal vibration isolation. A steel plate 235 and the rubber sheet 234 are alternately arranged between the upper support plate 231 and the lower support plate 232 to provide load-bearing capacity. Protective rubber 236 wraps around the rubber sheet 234 and the steel plate 235. The lining rubber 233 and the protective rubber 236 protect the rubber sheet 234 and the steel plate 235 and delay the aging of the rubber sheet 234.

[0045] While providing vertical bearing capacity and transmitting vertical loads, the rubber bearing 23 also has a certain horizontal shear flexibility due to the alternating arrangement of rubber sheets 234 and steel plates 235 inside, providing the horizontal vibration isolation capability of the foundation, realizing partial decoupling of vertical and horizontal movement, and allowing the mounting base 1 to undergo horizontal displacement relative to the lower mounting plate 21.

[0046] like Figure 4 As shown, the horizontal vibration isolation assembly 3 includes: a mounting housing 31, a side spring support 34, a second magnetorheological assembly 402, a first sliding pad 32, a side support spring 35, and a second sliding pad 33.

[0047] The mounting housing 31 is mounted on the lower mounting plate 21. The second magnetorheological component 402 and the side spring support 34 are evenly and alternately arranged inside the mounting housing 31. The first sliding pad 32 is disposed between the second magnetorheological component and the side wall of the bearing housing 13 to transmit horizontal forces. One end of the side support spring 35 is mounted to the side spring support 34 to transmit horizontal forces and provide positive stiffness. The second sliding pad 33 is disposed between the other end of the side support spring 35 and the side wall of the bearing housing 13 to transmit horizontal forces. The first sliding pad 32 and the second sliding pad 33 allow the bearing housing 13 to transmit forces when compressed, while also allowing it to slide freely in the non-operating direction, thus achieving motion decoupling.

[0048] According to some embodiments, a second wire groove 311 is provided on the mounting housing 31, and the second wire groove 311 is used to lay the wires of the excitation coil of the second magnetorheological component 402.

[0049] According to some embodiments, the first sliding pad 32 and the second sliding pad 33 are made of low-friction and wear-resistant material, which can transmit horizontal extrusion force while sliding freely in other orthogonal directions.

[0050] According to some embodiments, the horizontal vibration isolation components 3 have three layout schemes: when both horizontal directions are orthogonal to each other and have high-level vibration isolation requirements, four sets of horizontal vibration isolation components 3 are arranged on the four sides of the mounting base 1; when one horizontal direction is a high-level vibration isolation requirement and the other horizontal direction is a conventional vibration isolation requirement, the mounting base 1 is arranged with two sets of horizontal vibration isolation components 3 arranged opposite to each other in the horizontal direction corresponding to the high-level vibration isolation requirement; when both horizontal directions are orthogonal to each other and have conventional vibration isolation requirements, the mounting base 1 is not arranged with horizontal vibration isolation components 3.

[0051] According to some embodiments, this application classifies horizontal vibration isolation requirements into two levels: high-level and conventional, and provides corresponding quantitative judgment data: high-level vibration isolation requirements correspond to a site seismic fortification intensity ≥ 8 degrees, a vibration transmissibility requirement of ≤ 0.1 at the top of the valve tower, and coverage of extremely low frequency vibration reduction from 0.1Hz to 1Hz; conventional vibration isolation requirements correspond to a site seismic fortification intensity ≤ 7 degrees, an allowable vibration transmissibility of 0.1~0.3, and only the suppression of mid-to-high frequency vibrations above 2Hz. This two-level classification is used to guide the differentiated arrangement of horizontal vibration isolation components, reducing engineering manufacturing costs while meeting the equipment's seismic safety threshold. This application uses this as an example only, but is not limited thereto.

[0052] like Figure 5 As shown, the first magnetorheological component 401 and the second magnetorheological component 402 each include a force transmission component 41 and a magnetorheological chamber 42.

[0053] like Figure 6As shown, the force transmission component 41 includes: a first force guide plate 411, a third force guide plate 413, a second force guide plate 412, and a sealing ring 414.

[0054] The first guide plate 411 is located at the top, and the third guide plate 413 is located at the bottom. A sealing ring 414 covers the outer edge of the third guide plate 413. A second guide plate 412 connects the first guide plate 411 and the third guide plate 413. The first guide plate 411, the second guide plate 412, and the third guide plate 413 are sequentially hinged by pins to allow them to swing under external force, thereby adjusting the supporting force output by the first guide plate 411.

[0055] like Figure 7 As shown, the magnetorheological chamber 42 includes: a shell 421, a chamber 422, a flow channel 423, an outer chamber 424, an excitation coil 425, a cavity 426, a sealing piston plate 427, and an air hole 428.

[0056] The chamber 422 and the flow channel 423 are located inside the shell 421. The flow channel 423 connects to the chamber 422 and divides the chamber into upper and lower parts. The chamber 422 and the flow channel 423 are filled with magnetorheological fluid. The cavity 426 is located inside the shell 421. The sealing piston plate 427 is located inside the shell 421 and is used to separate the chamber 422 and the cavity 426. The third guide plate 413 extends into the outer chamber 424 and can move along the outer chamber 424 like a piston. The third guide plate 413 separates the flow channel 423 from the outer chamber 424 and achieves sealing isolation by the outer edge sealing ring 414 to prevent the magnetorheological fluid from entering the outer chamber 424. When the foundation vibration causes relative movement of the supports, it will push the third guide plate 413 to move like a piston in the outer chamber 424, pulling and pressing the magnetorheological fluid to flow through the flow channel 423. An excitation coil 425 is mounted on the housing 421 and surrounds the outer chamber 424 to generate a magnetic field to adjust the damping characteristics of the magnetorheological fluid. The housing 421 has vent holes 428.

[0057] According to some embodiments, the magnetic field generated by the excitation coil 425 is perpendicular to the flow direction of the magnetorheological fluid. The flowing magnetorheological fluid generates a damping force under the action of the magnetic field. This damping force is used to impede the piston movement of the third guide plate and dissipate vibration energy. The lower mounting plate 21 is provided with a first groove 211, and the mounting housing 31 is provided with a second groove 311. The first groove 211 and the second groove 311 are used to lay the wires connecting the excitation coil 425, so that the damping force can be dynamically adjusted by adjusting the current of the excitation coil 425.

[0058] According to some embodiments, the cavity 426 of the magnetorheological component is filled with gas to generate a thrust on the third guide plate 413, thereby subjecting the first guide plate 411 to a force in the same direction as its motion, giving the magnetorheological component negative stiffness characteristics. A vent 428 is provided on the housing 421 to inject or expel gas into the cavity 426, adjusting the negative stiffness value of the magnetorheological component so that its negative stiffness matches the positive stiffness provided by the bottom support spring 24, the side support spring 35, and the rubber support 23. The vibration isolation support for the converter valve forms a quasi-zero stiffness structure, completing the dynamic adjustment of the stiffness of the vibration isolation support for the converter valve. The damping force is a velocity-related dynamic resistance (opposite to motion, consuming energy); the negative stiffness thrust is a displacement-related static force (in the same direction as motion, canceling the positive stiffness). The two physical actions are independent and do not cancel each other out.

[0059] Figure 9 This is a schematic diagram illustrating the force principle of the damping force of the magnetorheological fluid and the thrust of the cavity air pressure inside the magnetorheological component 4, demonstrating the process by which the magnetorheological component 4 generates adjustable damping force and negative stiffness thrust.

[0060] like Figure 9 As shown, when ground foundation vibration causes relative displacement between mounting base 1 and lower mounting plate 21, the third guide plate 413 of force transmission component 41 reciprocates inside outer chamber 424, squeezing the magnetorheological fluid filled in chamber 422 and flow channel 423, forcing the magnetorheological fluid through narrow slit flow channel 423. The flow direction of the magnetorheological fluid is perpendicular to the direction of the magnetic field formed after the excitation coil 425 is energized. Under the action of the magnetic field, the apparent viscosity of the magnetorheological fluid increases sharply, forming a reverse damping force on the third guide plate 413, thereby consuming vibration energy. The lower mounting plate 21 has a first groove 211, and the mounting shell 31 has a second groove 311. The connecting wires of the excitation coil 425 can be laid on both. By changing the current of the excitation coil 425, the magnetic field strength can be adjusted in real time, and the damping force generated by the magnetorheological fluid can be continuously and dynamically controlled to adapt to excitation conditions with different vibration amplitudes and frequencies.

[0061] The cavity 426 is filled with high-pressure gas, which continuously applies a uniform gas pressure P to the magnetorheological fluid through the sealed piston plate 427. This gas pressure is transmitted to the third guide plate 413 via the magnetorheological fluid, applying a continuous thrust to the third guide plate 413 in the same direction as its movement. This thrust is then transmitted to the first guide plate 411 via the hinged force transmission assembly 41, causing the first guide plate 411 to be subjected to a force in the same direction as its movement, i.e., exhibiting negative stiffness characteristics, thus forming an auxiliary thrust that counteracts the positive stiffness of the bottom support spring 24 and the side support spring 35.

[0062] A vent 428 is provided on the surface of the housing 421 to connect to the cavity 426. Gas can be filled / discharged through the vent 428 to adjust the initial air pressure inside the cavity 426, precisely controlling the negative stiffness value output by the magnetorheological component 4. This ensures that the negative stiffness of the magnetorheological component 4 matches the positive stiffness provided by the bottom support spring 24, side support spring 35, and rubber support 23, allowing the overall vibration isolation support for the converter valve to reach a near-zero stiffness state, significantly reducing the system's natural frequency and achieving efficient isolation of extremely low-frequency vibrations from 0.1Hz to 1Hz. Throughout the equipment's operation, the air pressure inside the cavity 426 can be adjusted in real time via the vent's corresponding air control device, dynamically changing the negative stiffness output by the magnetorheological component, thereby dynamically adjusting the overall stiffness of the support to adapt to varying vibration excitation conditions.

[0063] The vertical positive load is transmitted between the mounting base 1 and the vertical vibration isolation component 2 via a rubber support 23 and a bottom support spring 24. The horizontal compressive load is transmitted between the mounting base 1 and the horizontal vibration isolation component 3 via a first sliding pad 32 and a second sliding pad 33. The horizontal vibration isolation component 3 is symmetrically arranged, and can withstand bidirectional compressive loads in the first horizontal axis between the horizontal vibration isolation component 3 and the mounting base 1. Furthermore, the horizontal vibration isolation component 3 and the mounting base 1 can slide relative to each other in the second and third axes, wherein the first horizontal axis, the second axis, and the third axis are orthogonal to each other, achieving three-degree-of-freedom vibration decoupling.

[0064] The following explanation is based on the example of vibration occurring in the foundation (as shown in mounting plate 21 below): Vertical vibration is transmitted through the bottom support spring 24 and the rubber support 23. The magnetorheological component 4 provides adjustable negative stiffness, which cancels out the positive stiffness of the spring, exhibiting quasi-zero stiffness in the vertical Z direction, greatly reducing the vertical natural frequency and effectively isolating low-frequency vertical vibration.

[0065] Meanwhile, the damping force generated by the magnetorheological component dissipates the vibration energy. Vibrations in the two orthogonal horizontal directions (X and Y directions) are respectively borne by two independently arranged horizontal vibration isolation components 3. The side support springs 35 and the magnetorheological component work together to achieve quasi-zero stiffness and adjustable damping in the X and Y directions, respectively.

[0066] The rubber bearing 23 simultaneously provides auxiliary horizontal vibration isolation. The rubber bearing 23 allows for horizontal relative movement between the mounting base 1 and the vertical vibration isolation assembly 2.

[0067] The first sliding pad 32 and the second sliding pad 33 inside the horizontal vibration isolation component 3 transmit force only in their respective main vibration isolation directions, and can slide freely in the other two orthogonal directions.

[0068] With the above-mentioned structural cooperation, the support can achieve independent vibration isolation control in three orthogonal directions: vertical Z-axis, horizontal X-axis, and horizontal Y-axis. The vibration isolation effects in the three directions are not coupled or interfere with each other.

[0069] Figure 10 This is a schematic diagram of the negative stiffness mechanical principle of the magnetorheological component 4. It is divided into three working conditions: initial state, compression state, and tension state. The core principle is: after the external force F drives the force transmission component 41 to swing, the output motion direction of the first guide plate 411 is in the same direction as the external force F, thereby producing a negative stiffness effect.

[0070] Initial state: The air pressure in the cavity 426 is stable, and the air pressure P on both sides applies a horizontal inward balanced thrust to the third guide plate 413. The first guide plate 411, the second guide plate 412, and the third guide plate 413 of the force transmission assembly 41 remain in a horizontal and straight hinged state.

[0071] Under pressure: A downward external force F is applied to the first guide plate 411, driving the second guide plate 412 to bend and swing downward; the horizontal air pressure P in the cavity 426 is converted into a downward auxiliary thrust through the hinged lever structure, and the overall movement direction of the first guide plate 411 is consistent with the externally applied pressure F, forming a negative stiffness effect.

[0072] Under tension: An upward external force F is applied to the first guide plate 411, driving the second guide plate 412 to bend and swing upward; the horizontal air pressure P in the cavity 426 is converted into an upward auxiliary thrust through the hinged lever structure. The overall movement direction of the first guide plate 411 is consistent with the externally applied tension F, exhibiting negative stiffness characteristics.

[0073] This application also provides a converter valve for a high-voltage converter station.

[0074] The converter valve of the high-voltage converter station includes the valve tower body, valve base support insulator, inclined insulator, and the vibration isolation support for the converter valve mentioned above.

[0075] The vibration isolation support for the converter valve is installed at the bottom of the valve tower body. The upper mounting plate 11 and lifting lug 12 are connected to the valve base support insulator and the inclined insulator, respectively, and the lower mounting plate 21 is fixed to the ground foundation. The converter valve of the high-voltage converter station relies on this vibration isolation support to achieve vertical and bidirectional horizontal three-degree-of-freedom semi-active vibration reduction, resisting the impact of earthquakes and low-frequency vibrations from near-shore waves, avoiding insulator breakage and power submodule loosening, and improving the equipment's seismic safety margin and long-term operational stability.

[0076] This application also provides a method for vibration suppression control of a converter valve.

[0077] The vibration suppression and control method uses the vibration isolation support for the converter valve described above to reduce the vibration of the converter valve, including steps S1-S5.

[0078] S1. Determine the vibration isolation requirements in two horizontal directions based on the vibration conditions of the valve tower installation site, and complete the layout of horizontal vibration isolation components 3: for bidirectional high-level requirements, arrange four sets on four sides; for unidirectional high-level requirements, arrange two sets of opposite components; for bidirectional conventional requirements, do not arrange horizontal vibration isolation components 3.

[0079] S2, gas is supplied to the cavity 426 through the air hole 428, the air pressure in the cavity 426 is adjusted, and the negative stiffness of the magnetorheological component is matched with the positive stiffness of the bottom support spring 24, the side support spring 35, and the rubber support 23, so that the vibration isolation support for the converter valve forms a quasi-zero stiffness initial state.

[0080] S3, the vibration sensor collects vertical and bidirectional horizontal triaxial vibration signals of the valve tower in real time and transmits them to the external controller.

[0081] S4, the controller outputs two adjustment commands: adjust the current of the excitation coil 425 to dynamically adjust the damping force; adjust the air pressure of the cavity 426 in real time to dynamically adjust the overall stiffness.

[0082] S5, after the vibration excitation disappears, the controller resets the excitation coil current and the air pressure in the cavity, and the converter valve uses the vibration isolation support to restore the quasi-zero stiffness standby state.

[0083] Through the above-described exemplary embodiments, this application provides a vibration isolation support for converter valves and a converter valve for high-voltage converter stations. It employs a quasi-zero stiffness system formed by combining spring positive stiffness with magnetorheologically controllable negative stiffness, overcoming the shortcomings of traditional vibration isolation devices that cannot isolate extremely low-frequency vibrations of 0.1Hz to 1Hz. It integrates a vertical, bidirectional horizontal three-degree-of-freedom decoupled vibration reduction structure, where damping and stiffness can be dynamically adjusted in real time. This semi-active control system balances vibration reduction performance, operational stability, and energy consumption. The horizontal vibration isolation components can be selected and arranged as needed, adapting to sites with different seismic resistance levels, resulting in strong engineering economics. The overall structure can be directly connected to the existing insulators of the valve tower, facilitating on-site assembly. It can be widely applied to seismic and vibration reduction retrofits and new construction projects for various valve tower equipment in flexible AC / DC converter stations, effectively improving the operational reliability and service life of the valve tower equipment.

[0084] It should be clearly understood that this application describes how specific examples are formed and used, but this application is not limited to any details of these examples. Rather, based on the teachings of the disclosure of this application, these principles can be applied to many other embodiments.

[0085] Furthermore, it should be noted that the above figures are merely illustrative representations of the processes included in the method according to exemplary embodiments of this application, and are not intended to be limiting. It is readily understood that the processes shown in the above figures do not indicate or limit the temporal order of these processes. Additionally, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0086] Exemplary embodiments of this application have been specifically shown and described above. It should be understood that this application is not limited to the detailed structures, arrangements, or implementation methods described herein; rather, this application is intended to cover various modifications and equivalent arrangements that fall within the objectives and scope of the appended claims.

Claims

1. A vibration isolation support for a converter valve, characterized in that, include: The mounting base is connected to the valve base insulator of the converter valve above it, which is isolated from vibration, and is used to provide bearing capacity to the converter valve and transfer load. A vertical vibration isolation assembly is connected between the lower part of the mounting base and the ground to provide load-bearing capacity to the mounting base and to provide vertical and horizontal vibration isolation capabilities to reduce vertical and horizontal vibrations transmitted from the ground to the converter valve. A horizontal vibration isolation assembly, connected to the side of the mounting base, is used to provide horizontal vibration isolation capability to reduce horizontal vibrations transmitted from the ground to the converter valve.

2. The vibration isolation support for a converter valve as described in claim 1, characterized in that, The mounting base includes: A bearing shell, wherein a secondary bottom spring support is provided on the inner bottom surface of the bearing shell; An upper mounting plate is disposed on the top of the bearing shell and is used to connect with the valve base support insulator of the converter valve; The lifting lug is located on the side of the upper mounting plate and is used to connect to the inclined pull insulator of the converter valve.

3. The vibration isolation support for the converter valve as described in claim 2, characterized in that, The vertical vibration isolation assembly includes: The lower mounting plate is used for fixed connection to the ground; The main bottom spring support is located in the middle area of ​​the lower mounting plate; The first magnetorheological component is disposed on the inner side enclosed by the main bottom spring support; A rubber support is disposed between the top of the first magnetorheological component and the bearing shell to transfer load and provide horizontal vibration isolation capability. The bottom support spring is mounted at both ends on the main bottom spring support and the secondary bottom spring support, respectively, to provide load-bearing capacity, positive stiffness and vertical vibration isolation capability.

4. The vibration isolation support for a converter valve as described in claim 3, characterized in that, The horizontal vibration isolation assembly includes: Side spring support; The housing is mounted on the lower mounting plate; The second magnetorheological component is arranged alternately and evenly with the side spring support inside the mounting housing; The first sliding pad is disposed between the second magnetorheological component and the side wall of the bearing shell, and is used to transmit horizontal force; A side support spring, one end of which is fitted to the side spring support, is used to transmit horizontal force and provide positive stiffness. The second sliding pad is disposed between the other end of the side support spring and the side wall of the bearing shell, and is used to transmit horizontal force.

5. The vibration isolation support for a converter valve as described in claim 4, characterized in that, Both the first magnetorheological component and the second magnetorheological component include: Force transmission components, including: The first force guide plate is located at the top; A third guide plate is disposed at the lower part, and a sealing ring is wrapped around the outer edge of the third guide plate; The second guide plate is connected between the first guide plate and the third guide plate. The first guide plate, the second guide plate and the third guide plate are hinged in sequence and used to swing under the action of external force to adjust the support force output by the first guide plate. The magnetorheological chamber includes: case; The chamber and the flow channel are disposed inside the shell, the flow channel is connected to the chamber, and the chamber and the flow channel are filled with magnetorheological fluid; A cavity is disposed inside the housing; A sealing piston plate is disposed inside the housing to separate the cabin and the cavity. An outer compartment is located in the middle of the shell, and the third guide plate extends into the outer compartment and can move axially along the inner wall of the outer compartment. An excitation coil, disposed on the housing and surrounding the outer chamber, is used to generate a magnetic field to adjust the damping characteristics of the magnetorheological fluid.

6. The vibration isolation support for a converter valve as described in claim 3, characterized in that, The rubber support includes: Upper support plate; The lower support plate, and both the upper support plate and the lower support plate are provided with inner rubber lining; Rubber sheets are used to provide horizontal vibration isolation. Steel plates, alternately arranged with the rubber sheets, are placed between the upper support plate and the lower support plate to provide load-bearing capacity; Protective rubber is wrapped around the outside of the rubber sheet and the steel plate. The inner lining rubber and the protective rubber are used to protect the rubber sheet and the steel plate to delay aging.

7. The vibration isolation support for a converter valve as described in claim 4, characterized in that, The vertical positive load is transmitted between the mounting base and the vertical vibration isolation assembly through the rubber support and the bottom support spring; The mounting base and the horizontal vibration isolation assembly transmit horizontal compressive loads through the first sliding pad and the second sliding pad; The horizontal vibration isolation components are symmetrically arranged, and the horizontal vibration isolation components and the mounting base can withstand bidirectional compressive loads in the first horizontal axis. The horizontal vibration isolation components and the mounting base can slide relative to each other in the second and third axes, wherein the first horizontal axis, the second axis, and the third axis are orthogonal to each other.

8. The vibration isolation support for a converter valve as described in claim 1, characterized in that, When both horizontal directions are orthogonal to each other and have high-level vibration isolation requirements, four sets of the horizontal vibration isolation components are arranged on the four sides of the mounting base; When one of the two orthogonal horizontal directions meets the high-level vibration isolation requirement and the other horizontal direction meets the conventional vibration isolation requirement, the mounting base is provided with two sets of the horizontal vibration isolation components corresponding to the horizontal direction of the high-level vibration isolation requirement. When both horizontal directions are orthogonal to each other and meet the conventional vibration isolation requirements, the mounting base does not have the horizontal vibration isolation components installed.

9. The vibration isolation support for a converter valve as described in claim 5, characterized in that, The magnetic field generated by the excitation coil is perpendicular to the flow direction of the magnetorheological fluid. The flowing magnetorheological fluid generates a damping force under the action of the magnetic field, and the damping force is used to resist the piston movement of the third guide plate. The lower mounting plate is provided with a first groove; The mounting housing is provided with a second wire groove. The first wire groove and the second wire groove are used to lay the wires connecting the excitation coil, so as to dynamically adjust the damping force by adjusting the current of the excitation coil.

10. The vibration isolation support for a converter valve as described in claim 5, characterized in that, The cavity of the magnetorheological component is filled with gas to generate a thrust on the third guide plate, thereby subjecting the first guide plate to a force in the same direction as its movement, and giving the magnetorheological component negative stiffness characteristics. The magnetorheological component has vent holes on its housing. These vent holes are used to fill or discharge gas into the cavity to adjust the negative stiffness value of the magnetorheological component. This allows the negative stiffness of the magnetorheological component to match the positive stiffness provided by the bottom support spring, the side support spring, and the rubber support, thereby giving the vibration isolation support for the converter valve a quasi-zero stiffness structure and enabling dynamic adjustment of the stiffness of the vibration isolation support for the converter valve.

11. A converter valve for a high-voltage converter station, characterized in that, include: Valve tower body, valve base support insulator, and inclined insulator; The vibration isolation support for the converter valve as described in any one of claims 1-10 is installed at the bottom of the valve tower body, the upper mounting plate of the vibration isolation support for the converter valve is connected to the valve base support insulator, the lifting lug of the vibration isolation support for the converter valve is connected to the inclined insulator, the lower mounting plate of the vibration isolation support for the converter valve is fixed to the ground foundation, and the converter valve achieves vertical, bidirectional horizontal three-degree-of-freedom semi-active vibration reduction through the vibration isolation support for the converter valve.

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