Multi-agent fast response power grid fusion terminal

Abstract

This invention relates to the field of intelligent connection equipment and control technology for power systems, specifically a multi-entity fast-response grid integration terminal. It comprises a connection housing, an industrial control computer, a vacuum pump, a conductive particle mixed medium, an antagonistic corrugated air chamber, a wedge-shaped conductive expansion ring, and a voltage transformer. The terminal regulates the pressure of the connection chamber through the vacuum pump. When the plug is inserted, the medium is in a low-viscosity fluid state to achieve flexible insertion. After insertion, the vacuum pump is activated to generate negative pressure, causing the medium to tightly lock the plug with high rigidity within a preset response period. Its core technology utilizes a medium composed of silver-plated copper particles and silicone oil, successfully separating the mechanical requirements of the insertion and current-carrying stages based on the particle blocking effect. This invention effectively solves the problem that traditional mechanical elastic terminals cannot simultaneously achieve flexible insertion and current-carrying resistance to electrodynamic forces, and simplifies the complexity of the connection structure.

Description

Technical Field

[0001] This invention relates to the field of intelligent connection equipment and control technology for power systems, specifically a multi-entity fast-response power grid integration terminal. Background Technology

[0002] In the current integrated and interactive operation environment of the power grid, electrical connection terminals need to be frequently plugged in and out, and withstand continuous loads and sudden electromagnetic repulsion impacts during the current-carrying state. To achieve conductive connection of the terminals, existing solutions generally adopt the traditional mechanical elastic terminal architecture, that is, to provide contact pressure by cooperating with independent spring components and rigid pressing components. Although this solution has basic current-carrying capacity in static connection scenarios, it relies heavily on a continuous high pre-tightening structure to maintain contact stability, and does not separate the mechanical requirements corresponding to the plugging and current-carrying stages. This results in high plugging operation resistance, high structural complexity, and weak dynamic compensation capability in the face of micro-scale impacts, making it difficult to support the adaptive stability requirements of the conductive interface to prevent transient loosening and force chain breakage under electromagnetic repulsion impacts.

[0003] Therefore, how to solve the problem of balancing flexible connection and current carrying capacity with electrodynamic resistance of terminals has become an urgent technical issue. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a multi-entity fast-response power grid convergence terminal. Specifically, the technical solution of this invention includes: The system comprises a connecting housing and an industrial control computer. The connecting housing has an internal connecting cavity filled with a conductive particle mixture. A vacuum pump is located outside the connecting housing, with its suction port connected to the connecting cavity via a pipe. The inner wall of the connecting cavity has a plurality of antagonistic corrugated air chambers evenly arrayed circumferentially. The inner cavity of each antagonistic corrugated air chamber communicates with the outside atmosphere through through holes in the side wall of the connecting housing. The outer wall of each antagonistic corrugated air chamber is completely submerged in the conductive particle mixture. A wedge-shaped conductive expansion ring is located at the axial front end of each antagonistic corrugated air chamber, with its inner conical surface facing the central axis of the connecting cavity. A voltage transformer is located outside the connecting housing. The probe of the voltage transformer is connected via wires to the conductive output terminal of the connecting housing and an external conductive plug for insertion into the connecting cavity. The industrial control computer is connected via cables to the signal output terminal of the voltage transformer and the control terminal of the vacuum pump.

[0005] Optionally: The conductive particle mixing medium is composed of a liquid-solid two-phase fluid of silver-plated copper particles and silicone oil mixed in a certain proportion. The vacuum pump is used to extract air and silicone oil from the connection cavity. The conductive particle mixing medium has an initial low-viscosity flowable state and is configured to establish a conductive bearing network by particle compression under the negative pressure formed by the vacuum pump.

[0006] Optionally: The external conductive plug is inserted axially into the connection cavity from the outside and is covered by a conductive particle mixture medium. When the external conductive plug is inserted into the connection cavity, the vacuum pump is in a stopped state. After the external conductive plug is inserted into place and triggers the initial detection signal of the voltage transformer, the industrial control computer controls the vacuum pump to start. The conductive particle mixture medium changes from a fluid state to a high-rigidity solid state and covers the external conductive plug.

[0007] Optionally: The voltage transformer is used to continuously acquire the voltage drop signal between the external conductive plug and the connection housing under the closed current-carrying state; the industrial control computer is used to perform high-frequency spectrum analysis on the voltage drop signal; the spectrum analysis is used to extract the voltage ripple amplitude and ripple frequency distribution.

[0008] Optionally: The industrial control computer is used to map the extracted voltage pulsation amplitude and pulsation frequency distribution to the degree of particle contact change.

[0009] Optionally, the industrial control computer is used to extract an energy index characterizing the initial characteristics of loosening of the contact network based on the degree of change in particle contact, and when the energy index exceeds a set threshold, to obtain the current decrease in contact stiffness and determine the target negative pressure value accordingly.

[0010] Optionally: The industrial control computer is used to convert the target negative pressure value into a pulse width modulation signal for the vacuum pump, and the pulse width modulation signal is used to dynamically increase the pumping pulse width of the vacuum pump.

[0011] Optionally, the industrial control computer is configured to adjust the negative pressure in the connection cavity by increasing the pumping pulse width of the vacuum pump, and the wall of the antagonistic corrugated air chamber is driven by the internal and external pressure difference to deform toward the inside of the connection cavity.

[0012] Optionally: the antagonistic corrugated air chamber expansion is used to push the wedge-shaped conductive expansion ring to move towards the central axis, and the wedge-shaped conductive expansion ring is used to apply a reverse counteracting force to the conductive particle mixing medium.

[0013] Optionally, the cone angle of the wedge-shaped conductive expansion ring and the deformation coefficient of the antagonistic corrugated air chamber are stored as preset fixed parameters in the industrial control computer, and the industrial control computer is configured to determine the target negative pressure value based on the decrease in contact stiffness, the cone angle, and the deformation coefficient.

[0014] The present invention has the following beneficial effects: 1. This invention successfully separates the mechanical requirements of the insertion and current-carrying stages by setting up a conductive particle mixture medium composed of silver-plated copper particles and silicone oil, along with a vacuum pump. When the external conductive plug is inserted, the vacuum pump is stopped, and the medium exhibits a low-viscosity fluid state, effectively reducing mechanical resistance during the insertion process and achieving flexible insertion. After insertion, the vacuum pump starts, and the medium, under negative pressure, transforms into a high-rigidity solid state within a preset response period based on the particle blocking effect, tightly locking the external conductive plug. This design effectively solves the problem that traditional mechanical elastic terminals cannot simultaneously achieve flexible insertion and current-carrying resistance to electrodynamic forces, and simplifies the complexity of the connection structure. 2. This invention utilizes a voltage transformer to collect voltage drop signals, and an industrial control computer extracts the voltage pulsation amplitude and frequency distribution to characterize contact changes under electromagnetic repulsion impact. When the contact stiffness decreases, the industrial control computer calculates the target negative pressure value and increases the vacuum pump's pumping volume through a pulse width modulation signal. The increase in negative pressure not only causes the medium to contract, but the resulting pressure difference also forces the antagonistic corrugated air chamber to expand, pushing the wedge-shaped conductive expansion ring to move towards the center to apply a reverse counteracting force to the medium. This mechanism accurately counteracts the centripetal contraction deformation, improves the dynamic compensation capability in the face of microscale impacts, and effectively prevents transient loosening of the conductive interface. Attached Figure Description

[0015] The following drawings, illustrating embodiments of this application, are incorporated herein by reference and are used to understand this application. The drawings illustrate embodiments of this application and their descriptions, serving to explain the principles of this application. In the drawings, Figure 1 This is a schematic diagram of the overall external structure of the device; Figure 2 This is a cross-sectional structural diagram of the connecting shell.

[0016] In the diagram: 1. Connecting housing; 3. Connecting cavity; 4. Conductive particle mixing medium; 5. Vacuum pump; 6. Gas pipe; 7. Antagonistic corrugated gas chamber; 8. Through hole; 9. Wedge-shaped conductive expansion ring; 10. Voltage transformer; 11. External conductive plug; 12. Conductive output terminal. Detailed Implementation

[0017] In the following description, numerous specific details are set forth to provide a more thorough understanding of this application. However, it will be apparent to those skilled in the art that embodiments of this application may be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with embodiments of this application.

[0018] Example 1: Please refer to Figure 1 and Figure 2 A multi-entity fast-response power grid convergence terminal, comprising: The connection housing 1 connects to the industrial control computer. A connection cavity 3 is formed inside the connection housing 1, filled with a conductive particle mixture 4. A vacuum pump 5 is installed outside the connection housing 1. The suction port of the vacuum pump 5 is connected to the interior of the connection cavity 3 via an air pipe 6. Several antagonistic corrugated air chambers 7 are evenly arranged in a circumferential array on the inner wall of the connection cavity 3. The inner cavity of each antagonistic corrugated air chamber 7 communicates with the outside atmosphere through through holes 8 on the side wall of the connection housing 1. The outer wall of each antagonistic corrugated air chamber 7 is completely submerged in the conductive particle mixture 4. In the electroparticle mixing medium 4, a wedge-shaped conductive expansion ring 9 is provided at the axial front end of the antagonistic corrugated gas chamber 7. The inner conical surface of the wedge-shaped conductive expansion ring 9 faces the central axis of the connecting cavity 3. A voltage transformer 10 is provided on the outside of the connecting housing 1. The detection end of the voltage transformer 10 is connected to the conductive output end 12 of the connecting housing 1 and the external conductive plug 11 for insertion into the connecting cavity 3 through wires. The industrial control computer is connected to the signal output end of the voltage transformer 10 and the control end of the vacuum pump 5 through cables.

[0019] In this embodiment, the connecting shell 1 serves as the insulating support body that carries each functional component. The connecting cavity 3 is disposed inside the connecting shell 1 and forms a working volume for accommodating the external conductive plug 11 and the conductive particle mixed medium 4. The conductive particle mixed medium 4 refers to a composite medium composed of conductive solid particles and insulating liquid phase medium, which can change the overall fluidity and contact conduction state under the action of pressure difference. It remains in a flowable state when not subjected to suction adjustment, and forms a dense contact network between particles after being subjected to suction adjustment. Vacuum pump 5 is connected to the interior of connection cavity 3 through air pipe 6 to establish a pressure difference between connection cavity 3 and the outside world, so as to adjust the density of conductive particle mixing medium 4; antagonistic corrugated air chamber 7 is located on the circumferential position of the inner wall of connection cavity 3, its inner cavity is connected to the outside atmosphere, and its outer wall is immersed in conductive particle mixing medium 4. Therefore, when the negative pressure inside connection cavity 3 changes, antagonistic corrugated air chamber 7 deforms under the action of internal and external pressure difference, and transmits the deformation to wedge-shaped conductive expansion ring 9; the inner conical surface of wedge-shaped conductive expansion ring 9 faces the central axis of connection cavity 3, and its function is to convert the deformation of antagonistic corrugated air chamber 7 into radial compensation force towards the periphery of external conductive plug 11; The voltage transformer 10 is connected between the root of the external conductive plug 11 and the conductive output terminal 12 of the connector housing 1. It is used to collect the voltage drop signal on the conductive path. The industrial control computer receives the signal and outputs the control signal to the vacuum pump 5. This structure addresses the problem that traditional mechanical elastic terminals have difficulty in balancing flexible insertion and current flow resistance. By combining the state transition of the conductive particle mixed medium 4, the geometric compensation driven by the pressure difference, and the electrical signal feedback control, the conductive interface maintains compliance during the insertion stage and contact stability during the current flow stage.

[0020] The conductive particle mixing medium 4 is composed of a liquid-solid two-phase fluid consisting of silver-plated copper particles and silicone oil mixed in a certain proportion. The vacuum pump 5 is used to extract the air and silicone oil in the connection cavity 3. The conductive particle mixing medium 4 has an initial low viscosity flowable state and is configured to establish a conductive bearing network by particle compression under the negative pressure formed by the vacuum pump 5.

[0021] In this embodiment, the conductive particle mixing medium 4 adopts a liquid-solid two-phase fluid form. The conductive solid phase is selected from silver-plated copper particles, and the liquid phase is selected from silicone oil. The silver-plated copper particles are used to provide a conductive skeleton, wherein the silver layer reduces the contact resistance between particles and slows down the interface oxidation, and the copper matrix ensures that the particles have conductivity and basic mechanical strength. The silicone oil is used to give the mixing medium fluidity when no negative pressure is established, and to provide lubrication and gap filling during particle movement. The particle size of the silver-plated copper particles can be set to a multi-level particle size distribution with mutual matching, so that the first particle with the first particle size forms the main force transmission path, and the second particle with the second particle size fills the particle gap, wherein the first particle size is larger than the second particle size to improve the packing density under negative pressure; the liquid-solid ratio is determined based on satisfying two conditions, one condition is that the mixed medium can flow and shift when the external conductive plug 11 is inserted, and the other condition is that stable blockage can occur between the particles after a predetermined negative pressure is formed in the connection cavity 3; after the vacuum pump 5 extracts the air and part of the silicone oil in the connection cavity 3, the free volume inside the mixed medium decreases, the number of contacts between particles increases, and the particle blockage effect is enhanced; The particle blockage effect refers to the mutual constraint of the bearing network formed by the compaction of particles in a confined space. At this time, the mixed medium changes from being mainly liquid flow to being mainly supported by particle compression, which is manifested as an increase in the overall elastic modulus and an increase in the number of particle contact points, which in turn increases the conductivity. This setting allows a single medium to simultaneously undertake the functions of plug-in buffer, conductive transmission and negative pressure locking, reducing the structural complexity caused by the coexistence of traditional independent spring components and rigid pressing components.

[0022] The external conductive plug 11 is inserted axially into the connection cavity 3 from the outside and is covered by the conductive particle mixing medium 4. When the external conductive plug 11 is inserted into the connection cavity 3, the vacuum pump 5 is in a stopped state. After the external conductive plug 11 is inserted into the position and triggers the initial detection signal of the voltage transformer 10, the industrial control computer controls the vacuum pump 5 to start. The conductive particle mixing medium 4 changes from a fluid state to a high-rigidity solid state and covers the external conductive plug 11.

[0023] In this embodiment, the external conductive plug 11 is inserted along the center direction of the connection cavity 3. During the insertion process, the vacuum pump 5 remains stopped, and no additional suction negative pressure is generated inside the connection cavity 3. Therefore, the conductive particle mixing medium 4 maintains a low viscosity fluid state. The low viscosity fluid state means that the conductive particles can undergo relative displacement in the silicone oil. When the external conductive plug 11 is pushed forward, the mixing medium generates local flow along the outer contour of the plug and automatically makes way, thereby absorbing the axial and radial deviations of the plug. For external conductive plugs 11 of different shapes and sizes, the mixing medium can rely on its own flow to complete the coating, so that a continuous contact interface is formed between the outer periphery of the plug and the connection cavity 3. After the external conductive plug 11 reaches the predetermined insertion depth, the industrial control computer outputs a start command to the vacuum pump 5. The vacuum pump 5 begins to extract air and migratory liquid phase from the connection chamber 3. The internal pressure of the connection chamber 3 decreases, the gaps between particles shrink, and a continuous bearing network is gradually formed. The extracted migratory liquid phase is introduced into the gas-liquid separation storage tank connected in series between the gas pipe 6 and the vacuum pump 5 for gas-liquid separation and volumetric storage. During this process, the mixed medium changes from a state dominated by fluidity to a state dominated by tightly mechanically interlocked particles, resulting in an increase in overall rigidity. The outer wall of the external conductive plug 11 is subjected to circumferential covering pressure and is locked. After locking, the conductive path no longer relies on a small number of fixed contact points, but is formed by multiple parallel conductive paths on the periphery of the plug by conductive particles. Therefore, a stable conductive connection can still be maintained even if there is an insertion error. This implementation separates the mechanical requirements corresponding to the insertion stage and the flow stage. By controlling the working state of the vacuum pump 5 to switch the mixed medium state, the problem of increased insertion force caused by the continuous high pre-tightening structure is avoided.

[0024] The voltage transformer 10 is used to continuously acquire the voltage drop signal between the external conductive plug 11 and the connection housing 1 under the closed current-carrying state. The industrial control computer is used to perform high-frequency spectrum analysis on the voltage drop signal. The spectrum analysis is used to extract the voltage ripple amplitude and ripple frequency distribution.

[0025] In this embodiment, the voltage transformer 10 is connected between the root of the external conductive plug 11 and the conductive output terminal 12 of the connector housing 1. Its acquisition object is the real-time voltage drop formed when the conductive current passes through the contact interface. The voltage drop signal includes a steady-state component and a pulsating component. The steady-state component reflects the overall conduction resistance level, and the pulsating component reflects the disturbance of the micro-scale contact state of the contact interface. After receiving the voltage signal output by the voltage transformer 10, the industrial control computer performs filtering, amplification and discrete sampling processing on the signal, and inputs the discrete sequence into the spectrum analysis program. The high-frequency band is a frequency range used to identify contact disturbance characteristics within a specific amplitude range relative to the power frequency component. Its upper and lower limits can be set according to the power grid noise level, sampling hardware resolution, and contact interface disturbance characteristics. The industrial control computer extracts two indicators in this frequency band: one is the voltage pulsation amplitude, which represents the voltage fluctuation intensity within a unit sampling interval, and the other is the pulsation frequency distribution, which represents the concentration of pulsation energy at different frequency positions. Because the particle contact network will experience an increase or decrease in contact points and a switching of current paths under electromagnetic repulsion disturbances, the resistance of the conductive path will fluctuate. This change will be reflected in the voltage drop signal in the form of high-frequency pulsations. Therefore, the voltage transformer 10 is used to directly collect and perform spectrum analysis, which can obtain contact state change information without damaging the main conductive structure, and provide input for subsequent control calculations.

[0026] The industrial control computer is used to map the extracted voltage pulsation amplitude and pulsation frequency distribution to the degree of particle contact change.

[0027] In this embodiment, the degree of particle contact change is a characterization quantity used to describe the stability of the internal contact network of the conductive particle mixed medium 4. Its definition is not the same as the crack propagation amount of solid material, but a comprehensive quantity used to represent the number of effective contact points between particles, contact duration, and the frequency of conductive path reconstruction. The industrial control computer normalizes the voltage pulsation amplitude and pulsation frequency distribution obtained in the high frequency band to eliminate the dimensional influence under different current levels and different baseline resistance conditions. The normalized voltage ripple amplitude is used to reflect the intensity of contact resistance disturbance, and the normalized ripple frequency distribution is used to reflect the discrete density of the disturbance. The industrial control computer has a preset mapping rule that associates an increase in amplitude with an increase in the degree of high-frequency energy concentration as an increase in the degree of particle contact change, and associates a decrease in amplitude with a smoother spectral distribution as a decrease in the degree of particle contact change. The mapping rule can be implemented using a lookup table, piecewise function, or weighted calculation formula. Its input is the spectral characteristic parameter, and its output is the degree of particle contact change in the form of dimensionless or relative quantity. The preset mapping rule constitutes a dynamic evaluation model of contact state inside the industrial control computer. The purpose of this model is to quantitatively evaluate the microscale stability of the contact network inside the conductive particle mixed medium 4 in real time without destroying the main conductive structure. In terms of logical structure and data flow, the model receives the normalized voltage ripple amplitude and ripple frequency distribution as input, and outputs a dimensionless particle contact change index through internal weight allocation and threshold comparison logic. In terms of physical relationships, the model abstracts the physical process of transient loosening, force chain breakage and conductive channel reconstruction caused by electromagnetic repulsion microscale impact under the current-carrying state of the power grid, and maps this microscale mechanical and electrical state change into an overall calculable numerical feature, thus providing direct data support for subsequent negative pressure compensation control. The basis for using this characterization quantity is that, under the action of electromagnetic repulsion, conductive particles will not necessarily experience overall displacement failure, but will exhibit loosening of the force chain network, local contact detachment, and the establishment of new conductive paths at the microscale. Such changes are difficult to accurately characterize through direct mechanical displacement signals, but evaluation results directly related to contact stability can be obtained through voltage pulsation feature mapping. This implementation method enables subsequent control to no longer rely on a single pressure setpoint, but to be dynamically corrected based on the contact network status; the input sources for normalization processing include the voltage ripple amplitude extracted by the industrial control computer within the same analysis cycle, the ripple energy distribution at each frequency position in the corresponding frequency band, the current current level, and the baseline voltage ripple reference value pre-calibrated under stable conduction conditions. The industrial control computer can first read the voltage pulsation amplitude within the current analysis period and compare it with the baseline voltage pulsation reference value stored at the corresponding current level to obtain a first relative quantity reflecting the degree of disturbance enhancement; then, it can perform zonal statistics on the pulsation frequency distribution in the high-frequency band to obtain the number, location, and concentration of high-frequency energy concentration areas, and form a second relative quantity reflecting the degree of spectral dispersion density; the first and second relative quantities are combined according to preset weights to obtain the degree of particle contact change. The preset weights are determined as follows: based on the experimental samples under rated current conditions, different negative pressure levels, and different insertion deviation conditions, the correspondence between voltage ripple characteristics and actual contact stability in each sample is compared. Then, features with a correlation degree greater than the preset benchmark value are given the first weight, and features with a correlation degree less than or equal to the preset benchmark value are given the second weight, and the value of the first weight is greater than the value of the second weight. The logical role of the degree of particle contact change in the control process is to serve as a unified criterion input for judging whether the contact network has become abnormally loose. When this characteristic quantity is lower than the preset reference threshold, the industrial control computer determines that the current conductive particle network remains stable. The preset reference threshold is calibrated by the baseline voltage pulsation parameters collected by the industrial control computer under no-load conduction state. When the characterization quantity increases with the sampling period and exceeds the preset benchmark threshold, the industrial control computer determines that the effective contact points between particles are decreasing or the switching of conductive paths is intensifying, and transmits this result to the subsequent calculation of spectral energy integration and contact stiffness reduction to trigger negative pressure compensation calculation. In order to execute the above mapping rules through the industrial control computer program, this embodiment uses normalization processing and weight parameters. and Adjustments are made to ensure changes in particle contact. The specific calculation formula is as follows: In the formula, For the summation operator, As a constant The natural logarithm function with base 0. This represents the voltage ripple amplitude extracted by the industrial control computer within the current analysis period. The baseline voltage ripple reference value is pre-calibrated under stable conduction conditions; For the first in the high frequency band Pulsating energy of each frequency band This represents the total pulsating energy of that high-frequency band. The ratio of the total number of sub-bands reflects the concentration of pulsating energy distribution in the frequency domain. and These are the preset first and second weighting coefficients, respectively, satisfying... In this embodiment, the values ​​are taken as 0.6 and 0.4 respectively based on the experimental calibration results; Using the above formula, the industrial control computer can make microscale mechanical and electrical disturbances dimensionless, thereby providing quantitative data support for subsequent precise control.

[0028] Example 2: The industrial control computer is used to extract the energy index that characterizes the initial characteristics of the loosening of the contact network based on the degree of change in particle contact, and when the energy index exceeds the set threshold, it obtains the current decrease in contact stiffness and determines the target negative pressure value accordingly.

[0029] In this embodiment, the industrial control computer performs integral calculation on the spectral energy corresponding to the degree of change in particle contact to obtain an energy index characterizing the cumulative degree of contact disturbance within a unit analysis period. When the energy index exceeds a set threshold, it is determined that the equivalent contact state between the current conductive particle mixing medium 4 and the external conductive plug 11 has shown a stiffness decrease trend that can lead to increased contact resistance fluctuations. The set threshold can be determined based on test data under no-load conduction state, rated current state, and disturbance conditions. The determination principle is to identify the initial characteristic signal of contact network loosening without causing malfunction. The industrial control computer uses Hertzian contact theory for inverse kinematics. The inverse kinematics does not calculate the absolute deformation of a single solid contact point, but rather treats the multi-point contact network between the conductive particle mixed medium 4 and the external conductive plug 11 as an equivalent contact system with comprehensive normal stiffness. The current decrease in contact stiffness is deduced from the known voltage disturbance characteristics, current-carrying parameters, and pre-stored calibration relationships. The decrease in contact stiffness represents the degree of reduction in the current comprehensive normal load-bearing capacity relative to the reference value of the stable conduction state. The industrial control computer calculates the target negative pressure value based on the drop amount and the system's preset differential pressure stiffness mapping relationship. The differential pressure stiffness mapping relationship is used to describe the change in particle compaction caused by the change in negative pressure in the connecting cavity 3 and the resulting contact stiffness compensation capability. Its input is the drop in contact stiffness, and its output is the target negative pressure value that can achieve compensation. This implementation method gives the control quantity of the vacuum pump 5 a clear mechanical basis, avoiding insufficient compensation or excessive suction due to fixed adjustment based solely on experience. The inverse calculation based on Hertzian contact theory constitutes a Hertzian contact equivalent model. The purpose of this model is to quantitatively assess the stiffness degradation of the particle contact network under electrodynamic impact when the microscale deformation of particles in a closed cavity cannot be directly observed. In terms of logic structure and data flow, the model receives the spectral energy integral value and the current flow parameters as input, and combines them with the pre-stored reference contact stiffness. By calculating the reduction in the equivalent contact area of ​​the multi-point contact system, it outputs the decrease in contact stiffness. In terms of the physical relationships represented, the model simulates the physical process of conductive particles undergoing microscale slippage and detachment under electromagnetic repulsion, resulting in a reduction in the overall contact area and a decrease in contact stiffness; at the same time, the pressure difference stiffness mapping relationship constitutes a negative pressure-stiffness compensation model, the purpose of which is to determine the external driving force required to restore the required stiffness. The model takes the decrease in contact stiffness as input and outputs the target negative pressure value. It physically characterizes the mechanical response law that the increase in negative pressure in the connection cavity 3 promotes the discharge of the migratory liquid phase and the shortening of the particle spacing to improve the overall contact stiffness. The input source of the spectrum energy integral is the sequence of particle contact change degree obtained by the industrial control computer in multiple consecutive sampling times and the corresponding pulsating energy distribution data in the high frequency band. The industrial control computer can first accumulate the pulsating energy in the high-frequency band according to the preset analysis cycle to obtain the total disturbance energy in the analysis cycle; then, the total disturbance energy is checked against the degree of particle contact change to eliminate misjudgment caused only by instantaneous noise spikes; the results of several consecutive analysis cycles are compared, and when the accumulated result exceeds the set threshold continuously or exceeds the higher-level fast response threshold in a single instance, it is determined that the contact network has entered a state that requires compensation from normal fluctuation; The method for determining the threshold is as follows: First, record the natural fluctuation range of high-frequency disturbance energy under stable conduction conditions, and then record the corresponding energy change range under test conditions where the degree of contact loosening gradually increases. The energy level that is higher than the upper limit of natural fluctuation and appears earlier than the obvious resistance deterioration phenomenon is set as the identification threshold. The method for determining the fast response threshold is as follows: On the basis of the set threshold, a preset energy mutation margin is added. This energy mutation margin is determined based on the voltage pulsation extreme value when the conductive interface undergoes transient force chain breakage under extreme electromagnetic repulsion impact. After the threshold is triggered, the industrial control computer processes the data in the following order: Step 1, read the current current, the current negative voltage level, and the reference contact stiffness parameters in the most recent stable cycle; Step 2: Compare the spectral energy integral result obtained in the current analysis cycle with the pre-stored calibration relationship to obtain the reduction level of the equivalent contact stiffness relative to the reference contact stiffness. Step 3: Combining the relationship between contact load and deformation according to Hertzian contact theory, the degradation level is converted into the current decrease in contact stiffness. Step 4: Based on the pressure difference stiffness mapping relationship, select a target negative pressure value that can compensate for the descent, while ensuring locking stability and avoiding excessive suction. The target negative pressure value plays a decision-making role in the control process as a direct input to the vacuum pump 5 adjustment module, indicating the negative pressure compensation level to be achieved in the next control cycle. This provides a clear source and basis for the generation of subsequent pulse width modulation signals. To achieve efficient inverse solving of the Hertzian contact equivalent model, the contact stiffness reduction in this embodiment... The specific calculation formula is as follows: In the formula, The reference contact stiffness of the system, This represents the integral value of the spectral energy within the current analysis period. To set a threshold, The elastic characteristic index, which is related to the conductive particulate material and its packing density, is set to 0.15 in this embodiment; when the spectral energy integral value... Exceeding the set threshold When this happens, the formula outputs a stiffness decrease greater than 0. The industrial control computer acquires... Then, by combining the pressure difference stiffness mapping relationship, the target negative pressure value required to restore stiffness is calculated. Its basic recurrence relation is: in, This is the current negative pressure value of the connection chamber 3. The pressure difference stiffness mapping coefficient is determined by the fluid compaction compensation coefficient and the mechanical geometric compensation coefficient, thereby ensuring that the adjustment of the vacuum pump 5 has strict contact mechanics theoretical support.

[0030] The industrial control computer is used to convert the target negative pressure value into a pulse width modulation signal for the vacuum pump 5. The pulse width modulation signal is used to dynamically increase the pumping pulse width of the vacuum pump 5.

[0031] In this embodiment, after calculating the target negative pressure value, the industrial control computer does not directly drive the vacuum pump 5 in a continuous quantity form. Instead, it converts the target negative pressure value into a pulse width modulation signal suitable for driving the actuator of the vacuum pump 5. The pulse width modulation signal includes control parameters such as modulation period, conduction signal width, and duty cycle. The duty cycle corresponds to the target negative pressure value. When the target negative pressure value increases, the duty cycle increases according to a predetermined relationship to increase the effective pumping workload of the vacuum pump 5 within a unit control cycle. The reason for using pulse width modulation is that the driving object of vacuum pump 5 is usually a motor or electromagnetic actuator. Pulse width modulation can achieve the adjustment of the pumping volume within the set allowable range of steady-state error without changing the basic power supply conditions, and facilitates the industrial control computer to perform iterative correction according to the discrete control cycle. After the industrial control computer outputs the pulse width modulation signal, vacuum pump 5 responds to the control signal to adjust the pumping pulse width, so that the negative pressure in the connecting cavity 3 approaches the target negative pressure value. To avoid over-adjustment during the control process, the industrial control computer can also set upper limit conditions and maintenance conditions for pulse width changes. That is, when the decrease in contact stiffness decreases in adjacent control cycles, the pulse width increment is reduced or the current duty cycle is maintained. This implementation method enables the negative pressure regulation to have a continuous and distinguishable control granularity, which makes it easy to convert the change in contact state into a real pumping action.

[0032] The industrial control computer is configured to adjust the negative pressure in the connecting cavity 3 by increasing the pumping pulse width of the vacuum pump 5. The wall of the antagonistic corrugated air chamber 7 is driven by the internal and external pressure difference to deform toward the inside of the connecting cavity 3.

[0033] In this embodiment, the vacuum pump 5 increases the pumping volume under the action of the pulse width modulation signal, and the pressure of the gas-liquid mixing space inside the connecting cavity 3 is further reduced, thereby forming a larger pressure difference between the inside and outside of the cavity; when the pressure difference increases, the movable part of the liquid phase inside the conductive particle mixing medium 4 continues to decrease, and the spacing between the particles decreases, which is generally manifested as the mixing medium shrinking into the confined volume corresponding to the low-pressure region. This shrinkage is not simply a reduction in volume, but is accompanied by an increase in the density of the particle carrying path, which can increase the covering pressure of the conductive particle mixed medium 4 on the circumferential surface of the external conductive plug 11; at the same time, the inner cavity of the antagonistic corrugated air chamber 7 is connected to the outside atmosphere. After the negative pressure inside the connecting cavity 3 increases, a greater pressure difference is formed inside and outside the antagonistic corrugated air chamber 7. The outside atmosphere acts on the inner cavity of the antagonistic corrugated air chamber 7 through the through hole 8, causing its wall to expand and deform towards the inside of the connecting cavity 3. The corrugated structure of the antagonistic corrugated chamber 7 is used to provide repeatable axial or radial deformation capability within a limited space, so that pressure difference changes can be converted into usable mechanical displacement. This embodiment shows that the increase in pumping volume by the vacuum pump 5 not only changes the density of the conductive particle mixing medium 4, but also simultaneously triggers the structural response of the antagonistic corrugated chamber 7, providing a driving source for subsequent geometric compensation.

[0034] The expansion of the antagonistic corrugated air chamber 7 is used to push the wedge-shaped conductive expansion ring 9 to move towards the central axis. The wedge-shaped conductive expansion ring 9 is used to apply a reverse counteracting force to the conductive particle mixing medium 4.

[0035] In this embodiment, after the antagonistic corrugated air chamber 7 deforms under the action of pressure difference, it transmits the displacement to the wedge-shaped conductive expansion ring 9 connected to its axial front end; the wedge-shaped conductive expansion ring 9 is provided with an inner conical surface facing the central axis of the connecting cavity 3. When the antagonistic corrugated air chamber 7 pushes the wedge-shaped conductive expansion ring 9 to move, the wedge structure converts the axial or oblique displacement into a radial extrusion force on the conductive particle mixing medium 4. The radial extrusion force acts on the outer region of the conductive particle mixture 4, forming a reverse counteracting force towards the circumferential coating layer of the external conductive plug 11. The target of the reverse counteracting force is the centripetal contraction tendency naturally generated by the conductive particle mixture 4 when the negative pressure increases. If the particle compaction is increased by relying solely on the negative pressure, the mixture may form uneven collapse in local areas, causing the external conductive plug 11 to deviate from its original geometric center and resulting in uneven distribution of contact stress. The reverse counteracting force provided by the wedge-shaped conductive expansion ring 9 can compensate for the contraction trend, so that the mixed medium can maintain circumferential force balance while increasing density; since the wedge-shaped conductive expansion ring 9 itself has conductive properties, it will not disrupt the continuity of the main conductive path when it comes into contact with the surrounding conductive particle mixed medium 4; this embodiment achieves the simultaneous existence of negative pressure densification effect and geometric stability effect, so that the conductive interface maintains a relatively stable contact shape when subjected to electrodynamic disturbance.

[0036] The cone angle of the wedge-shaped conductive expansion ring 9 and the deformation coefficient of the antagonistic corrugated air chamber 7 are stored as preset fixed parameters in the industrial control computer. The industrial control computer is configured to determine the target negative pressure value based on the decrease in contact stiffness, the cone angle, and the deformation coefficient.

[0037] In this embodiment, the control algorithm not only uses voltage pulsation characteristics and contact stiffness reduction as inputs, but also writes the cone angle of the wedge-shaped conductive expansion ring 9 and the deformation coefficient of the antagonistic corrugated air chamber 7 as preset structural parameters into the operation logic; the cone angle determines the mechanical gain of the wedge-shaped conductive expansion ring 9 in converting displacement into radial compensation force, and the deformation coefficient is used to represent the ability of the antagonistic corrugated air chamber 7 to generate displacement under unit pressure difference change. When the industrial control computer reverse-engineers the target negative pressure value from the decrease in contact stiffness, it not only considers the influence of negative pressure on the compaction degree of the conductive particle mixing medium 4, but also the geometric compensation effect formed by the negative pressure through the antagonistic corrugated air chamber 7 and the wedge-shaped conductive expansion ring 9. If the cone angle is greater than the preset angle threshold, the radial compensation component corresponding to the same displacement will change. When calculating the target negative pressure value, the industrial control computer needs to correct the compensation weight according to the pre-stored parameters. If the deformation coefficient of the antagonistic corrugated air chamber 7 changes, the displacement output capability under the same pressure difference will change. The industrial control computer will also adjust the conversion relationship between the target negative pressure value and the pulse width modulation signal according to the pre-stored parameters. By introducing the above structural parameters, the control algorithm keeps the electronic control adjustment and mechanical response consistent, avoiding mismatch between the control quantity and the actual compensation quantity due to changes in structural parameters. This implementation method ensures that the same control logic can obtain repeatable stiffness compensation results for the corresponding structure and provides a clear basis for algorithm correction after structural parameter adjustment. In this embodiment, the cone angle is a structural parameter used to characterize the ability of the wedge-shaped conductive expansion ring 9 to convert axial displacement into radial expansion components. The deformation coefficient is a response parameter used to characterize the magnitude of the deformation output by the antagonistic corrugated air chamber 7 under the action of a unit pressure difference increment. Together, they determine the amplification factor of the target negative pressure change on the actual geometric compensation effect. The input sources of the control algorithm include at least the current decrease in contact stiffness, the current negative pressure value of the connecting cavity 3, the pre-stored cone angle parameter, the pre-stored deformation coefficient parameter, and the pressure difference stiffness mapping relationship obtained by system calibration. The industrial control computer processes the above input quantities in the following order: First, it reads the current decrease in contact stiffness and determines the required compensation level; then, it retrieves the cone angle parameter and deformation coefficient parameter corresponding to the current terminal structure; it determines the particle compaction compensation and geometric stability compensation that a unit negative pressure change can bring under this set of structural parameters; it combines and compares the two types of compensation quantities, and uses the underlying electromechanical coordination formula to weight and superimpose the expected stiffness increments corresponding to the two types of compensation quantities to determine the target negative pressure value that should be increased to achieve the required compensation level; Specifically, if the industrial control computer determines that the displacement amplification coefficient of the current structure is greater than the preset coefficient threshold based on the pre-stored parameters, then the first target negative pressure increment is selected under the same contact stiffness reduction condition; if it determines that the deformation output capability of the current structure is less than or equal to the preset capability threshold, then the second target negative pressure increment is selected, wherein the first target negative pressure increment is less than the second target negative pressure increment, so as to ensure that the compensation effect ultimately applied to the conductive particle mixed medium 4 meets the requirements. The cone angle parameter and deformation coefficient parameter can be determined by the calibration method after the structure is finalized. That is, during the prototype stage, the deformation of the antagonistic corrugated air chamber 7 and the radial compensation effect produced by the wedge-shaped conductive expansion ring 9 under different negative pressure levels are recorded respectively, and then the correspondence is written into the parameter table of the industrial control computer. The decision-making role of the parameters in the control process is to avoid the control algorithm from abstracting and back-calculating based solely on changes in electrical signals, while ignoring the influence of the real mechanical structure on the compensation result. This ensures that the conversion process of the decrease in contact stiffness to the target negative pressure value has a clear data source, logical path, and structural correspondence. The control algorithm constitutes an electromechanical co-stiffness compensation model in the system. The purpose of this model is to accurately balance the fluid negative pressure compaction effect and the mechanical structure geometric compensation effect when calculating the compensation negative pressure, avoiding over- or under-compensation. In terms of logical structure and data flow, the model contains two parallel sub-computation modules: one is a fluid compaction compensation module, which receives the decrease in contact stiffness and the current negative pressure value of the connecting cavity 3 as inputs to calculate the expected first stiffness increment provided by pure fluid contraction; the other is a mechanical geometric compensation module, which receives the cone angle parameter and deformation coefficient parameter as inputs to calculate the expected second stiffness increment provided by the action of the antagonistic corrugated air chamber 7 and the wedge-shaped conductive expansion ring 9. The main algorithm module performs a weighted matching of the compensation capabilities of the two sub-modules, ultimately outputting the target negative pressure value required under the combined effect. Physically, this model characterizes the complex coupled mechanical laws where the same control variable, namely negative pressure change, simultaneously drives the phase change and densification of the fluid medium and the radial expansion of the solid mechanical structure, jointly counteracting the loosening tendency of the contact interface caused by electromagnetic repulsion. To deeply integrate the mechanical structure parameters with the electronic control algorithm and avoid control mismatch, the final target negative pressure value adopted in the electromechanical collaborative stiffness compensation model in this embodiment is... The calculation formula is: In the formula, This is the current negative pressure value of the connection chamber 3. This is the calculated decrease in contact stiffness; The cone angle of the pre-stored wedge-shaped conductive expansion ring 9. The deformation coefficient of the pre-stored antagonistic corrugated air chamber 7; The fluid compaction compensation coefficient characterizes the stiffness increment of the conductive particle mixed medium 4 due to phase change densification under a unit negative pressure increment. The mechanical geometric compensation coefficient characterizes the stiffness increment generated by the wedge-shaped conductive expansion ring 9 applying extrusive force to the medium under a unit radial displacement; This formula will represent the cotangent function of the geometric force transmission characteristics. and the deformation coefficient representing the gas chamber response sensitivity The feedback loop embedded in the denominator enables the industrial computer to dynamically adjust the negative pressure compensation step size based on specific hardware structure parameters; for example, when using a cone angle... Smaller expansion ring or deformation coefficient With a larger air chamber, the denominator increases, and the calculated target negative pressure increment will decrease accordingly, resulting in a different final target negative pressure value. This will also decrease accordingly, thus achieving precise adaptive adjustment of electromechanical coupling at the physical level.

[0038] This application has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this application to the described embodiments. Those skilled in the art will understand that many more variations and modifications can be made based on the teachings of this application, and all such variations and modifications fall within the scope of protection claimed in this application.

Claims

1. A multi-entity fast-response power grid convergence terminal, comprising: The connection housing (1) and the industrial control computer are characterized in that: a connection cavity (3) is provided inside the connection housing (1), the connection cavity (3) is filled with a conductive particle mixed medium (4), a vacuum pump (5) is provided outside the connection housing (1), the air extraction port of the vacuum pump (5) is connected to the inside of the connection cavity (3) through an air pipe (6), a plurality of antagonistic corrugated air chambers (7) are uniformly arranged in a circumferential direction on the inner wall of the connection cavity (3), the inner cavity of the antagonistic corrugated air chamber (7) is connected to the outside atmosphere through a through hole (8) opened on the side wall of the connection housing (1), and the outer wall of the antagonistic corrugated air chamber (7) is completely Immersed in a conductive particle mixing medium (4), the antagonistic corrugated air chamber (7) is provided with a wedge-shaped conductive expansion ring (9) at its axial front end. The inner conical surface of the wedge-shaped conductive expansion ring (9) faces the central axis of the connecting cavity (3). A voltage transformer (10) is provided on the outside of the connecting housing (1). The detection end of the voltage transformer (10) is connected to the conductive output end (12) of the connecting housing (1) and the external conductive plug (11) for insertion into the connecting cavity (3) via wires. The industrial control computer is connected to the signal output end of the voltage transformer (10) and the control end of the vacuum pump (5) via cables.

2. The multi-entity fast-response power grid convergence terminal as described in claim 1, characterized in that: The conductive particle mixing medium (4) is composed of a liquid-solid two-phase fluid of silver-plated copper particles and silicone oil mixed in proportion. The vacuum pump (5) is used to extract air and silicone oil from the connection cavity (3). The conductive particle mixing medium (4) has an initial low viscosity flowable state and is configured to establish a conductive bearing network by particle compression under the negative pressure formed by the vacuum pump (5).

3. The multi-entity fast-response power grid convergence terminal as described in claim 2, characterized in that: The external conductive plug (11) is inserted axially into the connection cavity (3) and covered by the conductive particle mixing medium (4). When the external conductive plug (11) is inserted into the connection cavity (3), the vacuum pump (5) is in a stopped state. After the external conductive plug (11) is inserted into the position and triggers the initial detection signal of the voltage transformer (10), the industrial control computer controls the vacuum pump (5) to start. The conductive particle mixing medium (4) changes from a fluid state to a high-rigidity solid state and covers the external conductive plug (11).

4. A multi-entity fast-response power grid convergence terminal as described in claim 3, characterized in that: The voltage transformer (10) is used to continuously collect the voltage drop signal at both ends of the external conductive plug (11) and the connecting housing (1) under the closed current state. The industrial control computer is used to perform high-frequency spectrum analysis on the voltage drop signal. The spectrum analysis is used to extract the voltage pulsation amplitude and pulsation frequency distribution.

5. A multi-entity fast-response power grid convergence terminal as described in claim 4, characterized in that: The industrial control computer is used to map the extracted voltage pulsation amplitude and pulsation frequency distribution to the degree of particle contact change.

6. A multi-entity fast-response power grid convergence terminal as described in claim 5, characterized in that: The industrial control computer is used to extract an energy index characterizing the initial characteristics of loosening of the contact network based on the degree of change in particle contact, and when the energy index exceeds a set threshold, it obtains the current decrease in contact stiffness and determines the target negative pressure value accordingly.

7. A multi-entity fast-response power grid convergence terminal as described in claim 6, characterized in that: The industrial control computer is used to convert the target negative pressure value into a pulse width modulation signal of the vacuum pump (5), and the pulse width modulation signal is used to dynamically increase the pumping pulse width of the vacuum pump (5).

8. A multi-entity fast-response power grid convergence terminal as described in claim 7, characterized in that: The industrial control computer is configured to adjust the negative pressure in the connection cavity (3) by increasing the pumping pulse width of the vacuum pump (5), and the wall of the antagonistic corrugated air chamber (7) is driven by the internal and external pressure difference to deform toward the inside of the connection cavity (3).

9. A multi-entity fast-response power grid convergence terminal as described in claim 8, characterized in that: The expansion of the antagonistic corrugated air chamber (7) is used to push the wedge-shaped conductive expansion ring (9) to move towards the central axis, and the wedge-shaped conductive expansion ring (9) is used to apply a reverse counteracting force to the conductive particle mixing medium (4).

10. A multi-entity fast-response power grid convergence terminal as described in claim 9, characterized in that: The cone angle of the wedge-shaped conductive expansion ring (9) and the deformation coefficient of the antagonistic corrugated air chamber (7) are stored as preset fixed parameters in the industrial control computer. The industrial control computer is configured to determine the target negative pressure value based on the decrease in contact stiffness, the cone angle, and the deformation coefficient.

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