Intelligent anti-seismic system of new energy assembled transformer substation

Abstract

The application discloses a new energy assembled substation intelligent anti-seismic system. The system comprises a structure support layer, an electrical distribution layer and a central control layer, wherein the structure support layer comprises an assembled column, a beam and an intelligent damping node mechanism, the mechanism is internally provided with a piezoelectric microseismic sensing array, a magneto-rheological damping elastic core and an annular excitation coil, the electrical distribution layer comprises a high-voltage switch cabinet and an uninterrupted standby power supply module, the high-voltage switch cabinet is provided with a main circuit breaker, and the central control layer comprises a microseismic linkage controller and a constant current source module. The microseismic linkage controller sends a tripping pulse to the main circuit breaker when determining the arrival of a seismic longitudinal wave, extracts an integral value to determine a target excitation current, and controls the constant current source module to output the target excitation current to the annular excitation coil. The application can realize a closed-loop seismic wave linkage of mechanical sensing, electrical disconnection and mechanical locking, cut off the main power supply circuit, and provide magneto-rheological stiffness compensation to strengthen the switch device framework.

Description

Technical Field

[0001] This application relates to the field of substation and switchgear technology, and in particular to an intelligent seismic resistance system for a new energy prefabricated substation. The technical solution of this application is directly related to the switchboard frame and insulated busbar support in the substation. Based on micro-seismic monitoring, it uses damping adaptive nodes to link seismic waves, thereby controlling the circuit breaker to actively trip and providing magnetorheological stiffness compensation, thus improving the seismic resistance of the high-voltage switchgear and the overall substation. Background Technology

[0002] New energy substations typically include wind farm booster stations and photovoltaic combiner stations. These substations are often built in open deserts, high-altitude areas, or remote areas with relatively poor geological conditions. To effectively shorten the construction period and reduce construction difficulty, prefabricated steel frames are often used for the switchgear structures that support core equipment such as high-voltage switchgear, busbar trunking, and grid-connected inverters. However, traditional prefabricated joints are prone to relative slippage and angular displacement when subjected to severe external seismic forces due to friction coefficient limitations and stress concentration issues between the connection surfaces. This physical deformation is directly transmitted to the rigidly fixed equipment, causing brittle fracture of the rigid busbar insulation bushings attached to them, which in turn leads to secondary disasters such as phase-to-phase short circuits and serious electrical fires.

[0003] Current substation seismic design often suffers from the technical deficiency of isolated mechanical and electrical protection. On the one hand, traditional substation seismic resistance mainly relies on the rigid stacking of the frame, increasing the cross-sectional area of ​​steel or using rigid pads to improve the tensile and shear resistance of the structure. This approach not only increases construction and transportation costs but also, due to the lack of sufficient buffer margin, is still prone to brittle fracture when faced with high-frequency seismic wave impacts. On the other hand, existing substation control systems typically rely solely on electrical parameters for passive protection. When equipment experiences an actual electrical short circuit due to mechanical deformation caused by an earthquake, a destructive high-energy arc has often already formed at the fault point. This overcurrent and overvoltage-based circuit breaker protection mechanism suffers from severe lag. Due to the lack of an interactive linkage mechanism between underlying mechanical deformation and electrical control, existing seismic protection devices cannot detect and utilize the time difference between the less destructive P-waves and the highly destructive S-waves in advance, making timely pre-emptive intervention and structural protection difficult, thus reducing the operational safety factor of new energy power plants. Summary of the Invention

[0004] This application provides an intelligent seismic resistance system for prefabricated new energy substations, which is used to improve the substation system's defense capabilities and equipment survival rate under seismic conditions.

[0005] This application provides an intelligent seismic resistance system for a prefabricated substation for new energy, comprising a structural support layer, an electrical distribution layer, and a central control layer. The structural support layer includes prefabricated columns, beams, and flanges. An intelligent damping node mechanism is installed between the prefabricated columns and beams via the flanges. The intelligent damping node mechanism has a pre-reserved relative displacement clearance. A piezoelectric micro-vibration sensor array is attached to the intelligent damping node mechanism, which is filled with a magnetorheological damping elastic core. A ring-shaped excitation coil is embedded in the inner wall of the intelligent damping node mechanism. The electrical distribution layer includes a high-voltage switchgear equipped with a main circuit breaker and an uninterruptible power supply module. The main circuit breaker has a fast-trip coil. The central control layer includes a micro-vibration linkage controller and a constant current source module. The micro-vibration linkage controller is connected to the piezoelectric micro-vibration sensor array, the fast-trip coil, and the constant current source module, respectively. The constant current source module is connected to the ring-shaped excitation coil. The micro-vibration linkage controller is configured to extract the main frequency based on the voltage signal output by the piezoelectric micro-vibration sensor array, send a trip pulse to the main circuit breaker when the arrival of the seismic longitudinal wave is determined, extract the integral value of the voltage signal to determine the target excitation current, and control the constant current source module to output the target excitation current to the ring excitation coil.

[0006] Furthermore, the intelligent damping node mechanism includes a first flange connecting plate and a second flange connecting plate. The first flange connecting plate is fixedly connected to the end of the prefabricated column, and the second flange connecting plate is fixedly connected to the end of the crossbeam. A relative displacement clearance is set between the mating surfaces of the first flange connecting plate and the second flange connecting plate. The piezoelectric micro-vibration sensing array includes multiple sets of piezoelectric ceramic sheets, which are respectively embedded in the inner wall of the peripheral side of the relative displacement clearance.

[0007] Furthermore, the first flange connecting plate has a spherical boss at its center, and the second flange connecting plate has a concave guide groove at its center that matches the spherical boss. A relative displacement clearance exists between the outer wall of the spherical boss and the inner wall of the concave guide groove. A magnetorheological damping elastic core seals and fills the relative displacement clearance and wraps around the spherical boss. A ring-shaped excitation coil is wound at equal intervals along the circumference of the concave guide groove. Multiple sets of piezoelectric ceramic sheets are fixedly attached to the outermost apex and the surrounding force-bearing sides of the spherical boss.

[0008] Furthermore, the electrical distribution layer also includes an energy storage capacitor connected to the constant current source module. The uninterruptible power supply module is electrically connected to the energy storage capacitor and outputs compensation energy to the constant current source module when the main power supply circuit is disconnected. The micro-vibration linkage controller includes a waveform recognition module, which performs bandpass filtering on the high-frequency piezoelectric signal output by the piezoelectric micro-vibration sensor array.

[0009] Furthermore, the micro-vibration linkage controller also includes a trigger drive module, which is electrically connected to the waveform recognition module and the fast trip coil of the main circuit breaker. The trigger drive module is configured to generate a trip pulse with a duration of a first preset duration when the waveform recognition module determines that the frequency of the first high-frequency piezoelectric signal cycle is greater than a first frequency threshold and the amplitude exceeds a first voltage threshold, thereby closing the built-in DC circuit of the micro-vibration linkage controller, driving the fast trip coil to operate, and cutting off the main power supply circuit.

[0010] Furthermore, the piezoelectric microvibration sensing array is made of piezoelectric materials, including lead magnesium niobate-lead titanate solid solution.

[0011] This application also provides a control method for an intelligent seismic-resistant system of a new energy prefabricated substation, applied to the aforementioned intelligent seismic-resistant system of the new energy prefabricated substation. The method includes the following steps: acquiring and sampling the high-frequency piezoelectric voltage signal output from the piezoelectric micro-seismic sensor array to obtain discrete voltage data; performing main frequency extraction and waveform recognition based on the discrete voltage data; when it is determined that a seismic P-wave with a main frequency greater than the P-wave frequency threshold has arrived, issuing a tripping pulse command to the fast tripping coil of the main circuit breaker; extracting the integral value of the voltage signal of the seismic P-wave, and determining the target excitation current based on the integral value of the voltage signal; and controlling the constant current source module to output the target excitation current to the ring excitation coil.

[0012] Furthermore, the steps for extracting the dominant frequency and identifying the waveform based on discrete voltage data include: performing a fast Fourier transform on the discrete voltage data to obtain the frequency domain energy spectrum; extracting the frequency corresponding to the peak value in the frequency domain energy spectrum as the dominant frequency; comparing the dominant frequency with a pre-stored P-wave frequency threshold, and determining that an earthquake P-wave arrival event has occurred when the dominant frequency is higher than the P-wave frequency threshold.

[0013] Further, the steps of extracting the voltage signal integral value of the seismic P-wave and determining the target excitation current based on the voltage signal integral value include: performing absolute value integration calculation on the high-frequency piezoelectric voltage signal within the first preset time window after the seismic P-wave is determined to arrive, to obtain the microseismic energy accumulation characteristic value; multiplying the microseismic energy accumulation characteristic value with a preset compensation coefficient and superimposing the foundation sustaining current to obtain the target excitation current.

[0014] Furthermore, the step of extracting the voltage signal integral value of the seismic P-wave and determining the target excitation current based on the voltage signal integral value also includes: comparing the target excitation current with the rated maximum current of the toroidal excitation coil; when the target excitation current is greater than the rated maximum current, using the rated maximum current as the final excitation current command value; when the target excitation current is less than or equal to the rated maximum current, using the target excitation current as the final excitation current command value; and within a second preset time window after confirming the issuance of a trip pulse command to the main circuit breaker, sending a drive signal containing the final excitation current command value to the constant current source module.

[0015] This application integrates microseismic sensing devices and magnetorheological materials at structural nodes, establishes the triggering conditions of the control system on the underlying mechanical micro-motion signals, utilizes longitudinal waves to trigger active power outage operations, and instantly locks the frame stiffness before transverse wave impact, thereby achieving preventive protection for substation equipment and reducing the risk of insulating bushing rupture and electrical fires. Attached Figure Description

[0016] Figure 1 This paper shows an overall structural schematic diagram of the intelligent seismic-resistant system for a new energy prefabricated substation provided in an embodiment of this application; Figure 2 A cross-sectional view of the intelligent damping node mechanism provided in an embodiment of this application is shown; Figure 3 A flowchart of the control method provided in an embodiment of this application is shown.

[0017] Explanation of reference numerals in the attached drawings: 101 Prefabricated column, 102 Horizontal beam, 103 Intelligent damping node mechanism, 104 High-voltage switchgear, 106 Micro-vibration linkage controller, 201 First flange connecting plate, 202 Second flange connecting plate, 203 Relative displacement clearance, 206 Annular excitation coil, 207 Spherical boss, 208 Concave guide groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure.

[0019] like Figure 1As shown in the figure, this application embodiment provides an intelligent seismic resistance system for a new energy prefabricated substation. The system's overall architecture is divided into an interwoven structural support layer, an electrical distribution layer, and a central control layer. The structural support layer includes several prefabricated columns 101 and beams 102 used to construct the substation's foundation load-bearing framework. The prefabricated columns 101 and beams 102 are made of high-strength steel and are used to support the electrical distribution panels and auxiliary pipelines above. The prefabricated columns 101 and beams 102 are connected and secured by flange plates and bolt arrays. At each critical flange connection surface, the traditional rigid metal pads are eliminated, and instead, an intelligent damping node mechanism 103 with both sensing and energy absorption functions is installed. The intelligent damping node mechanism 103 has a pre-reserved relative displacement clearance 203, its outer layer is attached with a piezoelectric micro-vibration sensor array, and its cavity is filled with a magnetorheological damping elastic core. A ring-shaped excitation coil 206 is also embedded in the inner wall of the intelligent damping node mechanism 103. This configuration gives the originally passive structural support layer the ability to sense minute external vibrations and change its own physical and mechanical properties.

[0020] The electrical distribution layer is installed on a prefabricated frame and mainly includes a group of high-voltage switchgear 104 equipped with main circuit breakers, busbar trunking, and grid-connected inverter equipment. The incoming terminals and control actuators of the main circuit breakers are equipped with fast-trip coils. Simultaneously, considering the possibility of external power grid failure under strong earthquake conditions, the system is also equipped with an uninterruptible power supply module independent of the main power grid. The central control layer is mainly deployed in the substation relay protection room, and its core consists of a micro-vibration linkage controller 106 and a controlled constant current source module. The micro-vibration linkage controller 106 has strong data throughput capabilities. Its downlink interface uses shielded twisted-pair cables to connect to the piezoelectric micro-vibration sensor array inside all intelligent damping node mechanisms 103 to receive monitoring data, while its uplink control interface is connected to the fast-trip control circuit of the main circuit breaker. The current drive output port of the micro-vibration linkage controller 106 is connected to the input terminal of the constant current source module, while the output terminal of the constant current source module is connected to the toroidal excitation coil 206. This hardware connection topology enables a closed-loop circuit where mechanical sensing signals guide electrical actions. The micro-vibration linkage controller 106 is configured to extract the main frequency based on the voltage signal output from the piezoelectric micro-vibration sensor array. Upon determining the arrival of the seismic longitudinal wave, it immediately sends a trip pulse to the main circuit breaker. Simultaneously, it extracts the integral value of the voltage signal to determine the corresponding target excitation current and controls the constant current source module to output the target excitation current to the ring excitation coil 206.

[0021] Based on this, since the pre-vibration detection signal is very weak, environmental electromagnetic interference may cause false triggering. Therefore, the micro-vibration linkage controller 106 in this embodiment specifically adopts an industrial-grade motherboard with an embedded high-performance microprocessor. This microprocessor has a high clock frequency and floating-point operation capability. To ensure the reliability of the signal link, the system also includes a conditioning and amplification circuit design module for the front-end micro-piezoelectric signal. This conditioning and amplification circuit design module is located close to the piezoelectric micro-vibration sensor array and is used to perform high input impedance matching, low-pass filtering, and linear gain amplification on the microvolt-level high-frequency piezoelectric voltage signal, thereby converting it into a standardized voltage signal that can be transmitted over long distances. By adopting a high-speed hardware base, a low time delay is ensured between the generation of the physical vibration signal and the output of the electrical pulse command.

[0022] Furthermore, to clearly illustrate the internal physical structure and force transmission path of the intelligent damping node mechanism 103, such as... Figure 2 As shown in the cross-sectional view, the intelligent damping node mechanism 103 is embedded between the flange of the prefabricated column 101 and the flange of the beam 102, forming a cylindrical sandwich structure. The intelligent damping node mechanism 103 mainly includes a first flange connecting plate 201 and a second flange connecting plate 202. The first flange connecting plate 201 is bolted to the end flange plate of the prefabricated column 101, acting as a base bearing plate; the second flange connecting plate 202 is bolted to the end flange plate of the beam 102, acting as a sliding cover. A relative displacement clearance 203 is provided between the mating surfaces of the first flange connecting plate 201 and the second flange connecting plate 202. In this embodiment, the tolerance space of the relative displacement clearance 203 is designed to be 5mm to 8mm. The relative displacement clearance 203 allows for a small floating buffer area between the various components of the structural support layer when they are not subjected to extreme stress, allowing the frame to have a certain degree of flexibility to absorb minor vibrations caused by wind loads and slowing down the fatigue aging of the structural metal components.

[0023] The piezoelectric micro-vibration sensing array comprises multiple sets of piezoelectric ceramic sheets, which are respectively embedded in the inner peripheral wall of the relative displacement clearance 203. Specifically, a spherical boss 207 extends from the center of the first flange connecting plate 201, while a concave guide groove 208 matching the spherical boss 207 is correspondingly provided at the center of the second flange connecting plate 202. The relative displacement clearance 203 exists between the outer wall of the spherical boss 207 and the inner wall of the concave guide groove 208. The multiple sets of piezoelectric ceramic sheets are respectively fixedly attached to the outermost apex and the surrounding force-bearing sides of the spherical boss 207. Any high-frequency micro-vibration transmitted on the column will act on these piezoelectric ceramic sheets, causing them to generate a high-frequency piezoelectric voltage signal V due to the piezoelectric effect. pztThe piezoelectric microvibration sensing array is made of a highly sensitive piezoelectric material. In this embodiment, the piezoelectric material specifically includes a lead magnesium niobate-lead titanate solid solution, which has a high electromechanical coupling coefficient. Preferably, the piezoelectric microvibration sensing array employs a piezoelectric stack array, which can generate millivolt to volt-level voltage outputs under micrometer-level deformation.

[0024] The magnetorheological damping elastic core is sealed and filled within the relative displacement clearance 203, completely enclosing the spherical protrusion 207. The matrix of the magnetorheological damping elastic core is natural rubber, with fine carbonyl iron powder particles dispersed within the rubber matrix. In a natural, magnetic field-free state, this magnetorheological damping elastic core exhibits a low shear modulus similar to ordinary rubber, acting as a basic shock-absorbing pad. The annular excitation coil 206 is wound at equal intervals along the circumference of the concave guide groove 208 and embedded in the insulating inner wall of the intelligent damping node mechanism 103 shell, forming a complete electromagnetic excitation ring. The annular excitation coil 206 surrounds the magnetorheological damping elastic core. When the target excitation current provided by the constant current source module is passed through the annular excitation coil 206, the resulting closed magnetic field lines will instantly penetrate the magnetorheological damping elastic core. The carbonyl iron powder particles in the magnetic field will polarize along the direction of the magnetic field lines and arrange themselves into a strong chain-like microstructure, hindering the shear slip of the rubber matrix. This physical property transition enables the equivalent shear modulus of the magnetorheological damping elastic core to increase rapidly (within 15ms), up to 300%, allowing the intelligent damping node mechanism 103 to instantly transform from a "flexible damping state" to a "high-rigidity locked state." Through the aforementioned mechanical coupling structure, the stiffness of the entire steel frame can be actively altered before the external excitation force reaches a destructive level.

[0025] To support the instantaneous stiffness transitions of the aforementioned mechanical systems and ensure the safe isolation of the electrical network, the electrical distribution layer is further equipped with energy storage and triggering hardware. The electrical distribution layer also includes an energy storage capacitor connected to the constant current source module. The uninterruptible power supply module is electrically connected to this energy storage capacitor, and its main function is to output compensation energy at full power to the constant current source module when the main circuit breaker disconnects the main power supply circuit of the substation. The micro-vibration linkage controller 106 includes a waveform recognition module. Due to the presence of high-voltage electromagnetic interference and conventional low-frequency wind-driven vibrations at the substation site, the waveform recognition module performs bandpass filtering on the high-frequency piezoelectric signals output by the piezoelectric micro-vibration sensor array. The waveform recognition module has a built-in high-order digital bandpass filter to filter out unwanted interference frequency band signals.

[0026] The micro-vibration linkage controller 106 also includes a trigger drive module. The trigger drive module is hardwired to both the waveform recognition module and the fast trip coil of the main circuit breaker. The trigger drive module is configured to directly generate an interrupt signal in the underlying hardware when the waveform recognition module determines that the frequency of the first high-frequency piezoelectric signal cycle is greater than a first frequency threshold and the amplitude exceeds a first voltage threshold, generating a trip pulse with a duration of a first preset duration. In this embodiment, the trip pulse is a 24V DC voltage, and the first preset duration is controlled within 5ms. Subsequently, the trigger drive module closes the built-in DC circuit of the micro-vibration linkage controller 106 through a high-power transistor, driving the fast trip coil of the main circuit breaker to actuate and disconnect the main power supply circuit. This operation utilizes the physical laws of seismic wave propagation to achieve a millisecond-level active protection mechanism, avoiding the catastrophic consequences of passively waiting for short circuits in equipment to generate arcs.

[0027] It should be noted that the specific examples of microprocessor core models, piezoelectric array materials, and displacement clearance dimensions mentioned above are merely preferred embodiments. Those skilled in the art can, based on the actual scale of the substation, the seismic fortification level of the seismic zone, and the load requirements, use other models of high-speed digital signal processors or replace them with piezoelectric composite materials based on barium titanate to equivalently implement the sensing and control functions of this application.

[0028] The following reference Figure 3 Please provide an explanation, such as Figure 3 As shown in the figure, this application embodiment also provides a control method for an intelligent seismic-resistant system applied to the above-mentioned new energy prefabricated substation. This method is mainly accomplished by the logic processing unit in the micro-seismic linkage controller 106 executing pre-programmed control code. The control method includes the following steps: Step S301: Acquire the high-frequency piezoelectric voltage signal output by the piezoelectric micro-vibration sensor array and perform sampling processing to obtain discrete voltage data.

[0029] In this step, the micro-vibration linkage controller 106 samples the high-frequency piezoelectric voltage signal V output by the piezoelectric sensor within the intelligent damping node mechanism 103 at a sampling frequency of 10kHz. pzt High-frequency analog-to-digital (A / D) conversion sampling is performed. Before A / D conversion, the signal is processed by a front-end anti-aliasing filter to ensure the authenticity of the reconstructed sampling sequence. Through continuous sampling cycles, a discrete voltage data stream buffer reflecting the micro-squeezing state of the architecture's normal direction is constructed.

[0030] Step S302: Based on discrete voltage data, perform main frequency extraction and waveform recognition. When it is determined that the current waveform is a seismic P-wave with a main frequency greater than the P-wave frequency threshold, send a trip pulse command to the fast trip coil of the main circuit breaker.

[0031] To accurately distinguish between ordinary environmental micro-seisms and seismic P-waves with precursory significance, this step performs frequency domain transformation on the signal. To meet the requirements of high-frequency computation, the system enables the digital signal processor instruction set or coprocessor hardware support module required for algorithm execution. Specifically, the process of extracting the dominant frequency and identifying the waveform based on discrete voltage data includes: performing a Fast Fourier Transform on the discrete voltage data within the current time window to obtain the frequency domain energy spectrum of the signal for that period; extracting the frequency corresponding to the energy peak in the frequency domain energy spectrum as the current dominant frequency; and comparing this dominant frequency with the P-wave frequency threshold pre-stored in memory. In this embodiment, the dominant frequency determination range for P-wave characteristics is typically between 5Hz and 20Hz. When the dominant frequency falls within this range, the rate of rise of the signal amplitude envelope is simultaneously calculated. Exceeding the preset threshold K th At that time, cross-validation can be used to determine the occurrence of an earthquake P-wave arrival event.

[0032] Upon confirmation of the arrival of the seismic P-wave, the microseismic linkage controller 106 sends a trip pulse command to the main circuit breaker of the high-voltage switchgear 104 within 5ms. Upon receiving the trip pulse, the internal mechanical mechanism of the main circuit breaker forcibly opens and completes the arc-extinguishing disconnection action within 20ms. The substation instantly completes the electrical disconnection of the main system. Simultaneously, the system releases the residual energy in the energy storage capacitor into the discharge resistor through internal hardware, reducing the secondary risks of busbar short-circuit explosion and electrical fire.

[0033] Step S303: Extract the integrated value of the voltage signal of the seismic P-wave and determine the target excitation current based on the integrated value of the voltage signal.

[0034] After completing the safe operation of electrical isolation, structural stiffness compensation calculations were initiated in parallel to counteract the subsequent, more destructive seismic shear waves. This step specifically includes: performing absolute value integration on the high-frequency piezoelectric voltage signal within the first preset time window after the arrival of what is determined to be a seismic P-wave, to obtain the cumulative microseismic energy characteristic value. Since there is a certain physical correspondence between the microseismic energy of the seismic P-wave and the destructive force of the subsequent seismic shear wave, the integration operation effectively extracted this correlated characteristic quantity.

[0035] The micro-vibration linkage controller 106 calculates the target excitation current command value using a linear compensation formula. The calculation logic presents a positive linear compensation mapping between energy input and current output. The specific mathematical calculation formula is as follows: (1) In this embodiment, for specific architectural parameters, The value can be set from 0.3 A / J to 0.8 A / J. The value can be set from 0.1A to 0.3A. Using this formula, when a stronger accumulation of microseismic energy is detected, the system will calculate a higher intensity compensation current proportionally.

[0036] Furthermore, to prevent the coil from overheating and burning out and to ensure drive safety, step S303 also includes current clamping and limiting logic: the calculated target excitation current I... ref With the rated maximum current I of the toroidal excitation coil 206 max A comparison and judgment are made. In this embodiment, the upper limit I is controlled. max The limit is 3.0A. When the calculated target excitation current is greater than the rated maximum current of 3.0A, the rated maximum current will be used as the final excitation current command value; when the calculated target excitation current is less than or equal to the rated maximum current, the target excitation current itself will be used as the final excitation current command value.

[0037] Step S304: Control the constant current source module to output the target excitation current to the ring excitation coil 206.

[0038] Within the second preset time window after confirming the issuance of the trip pulse command to the main circuit breaker and completing the calculation, the micro-vibration linkage controller 106 obtains energy from the uninterruptible backup power supply module and the energy storage capacitor, and sends a digital or analog drive signal containing the final excitation current command value to the constant current source module. The constant current source module then outputs a precise DC current to inject into the ring excitation coils 206 distributed at each frame connection. Through this feedforward control, the magnetorheological damping elastic core completes polarization in a short time, securing all assembled nodes.

[0039] In an extended embodiment of this application, considering that some substations operate in extremely cold environments for extended periods, the low-temperature hardening of the rubber matrix may cause an initial drift in the background shear modulus of the magnetorheological damping elastic core. To improve the robustness of the compensation calculation, a temperature sensor module is added to the outer shell of the intelligent damping node mechanism 103. Before performing the target excitation current calculation, the micro-vibration linkage controller 106 obtains the current node ambient temperature value through the temperature sensor. When the ambient temperature is lower than a preset temperature threshold (e.g., -10 degrees Celsius), the micro-vibration linkage controller 106 dynamically adjusts the material sensitivity gain coefficient according to the internally stored temperature-modulus attenuation lookup table. The value is adjusted, and the bias holding current constant is increased proportionally. The value of is . By introducing a temperature correction variable, the influence of ambient temperature on the initial state of the magnetorheological material can be eliminated, preventing compensation overload or abnormal heating caused by the freezing and hardening of the underlying material, thus enhancing the stable operation capability of the control logic under complex climatic conditions. It should be noted that the temperature threshold and reduction ratio here are only examples. Those skilled in the art can use a multi-dimensional parameter correction matrix algorithm based on ambient humidity or historical deformation fatigue counts to perform similar compensation gain adjustment, all of which can achieve the goal of improving the accuracy of current calculation.

[0040] The system and control method provided in this application have changed the long-term isolated defense status of mechanical support structures and electrical protection systems in traditional substation design. By introducing piezoelectric microseismic sensor arrays with mechanical sensing functions and magnetorheological damping elastic cores with electromagnetic variable stiffness properties into key pressure-bearing nodes, a rapid transformation from underlying physical sensing to electrical commands is achieved. By accurately capturing the tiny time difference between seismic P-waves and S-waves, before the highly destructive S-waves impact the rigid frame of the substation, a trip pulse is actively sent to cut off the main power supply circuit, avoiding bus bushing fractures caused by significant frame torsion and subsequent phase-to-phase short circuits, fires, and explosion hazards. Simultaneously, backup power is injected into the intelligent damping node mechanism based on energy characteristics calculations, enabling it to complete a stiffness transition in a short time, forcibly tightening the dispersed prefabricated frame into a high-rigidity whole to resist S-waves. This design logic improves the equipment survival rate of new energy substations under extreme natural conditions at the source level, demonstrating excellent collaborative seismic defense effects.

Claims

1. An intelligent seismic-resistant system for a new energy prefabricated substation, characterized in that, include: The structural support layer includes prefabricated columns, beams, and flanges. An intelligent damping node mechanism is provided between the prefabricated columns and beams through the flanges. The intelligent damping node mechanism has a reserved relative displacement clearance. The intelligent damping node mechanism is attached with a piezoelectric micro-vibration sensor array for outputting voltage signals and filled with a magnetorheological damping elastic core. A ring excitation coil is embedded in the inner wall of the intelligent damping node mechanism. The electrical distribution layer includes a main power supply circuit, a high-voltage switchgear equipped with a main circuit breaker, and an uninterruptible backup power module, wherein the main circuit breaker is equipped with a fast trip coil; The central control layer includes a micro-seismic linkage controller and a constant current source module. The micro-seismic linkage controller is connected to the piezoelectric micro-seismic sensor array, the fast trip coil, and the constant current source module. The constant current source module is connected to the ring excitation coil. The micro-seismic linkage controller is configured to extract the main frequency based on the voltage signal output by the piezoelectric micro-seismic sensor array, send a trip pulse to the main circuit breaker when the arrival of the seismic P-wave is determined, extract the integral value of the voltage signal to determine the target excitation current, and control the constant current source module to output the target excitation current to the ring excitation coil.

2. The intelligent seismic resistance system for new energy prefabricated substations according to claim 1, characterized in that, The intelligent damping node mechanism includes a first flange connecting plate and a second flange connecting plate. The first flange connecting plate is fixedly connected to the end of the prefabricated column, and the second flange connecting plate is fixedly connected to the end of the crossbeam. The relative displacement clearance is set between the mating surfaces of the first flange connecting plate and the second flange connecting plate. The piezoelectric micro-vibration sensing array includes multiple sets of piezoelectric ceramic sheets, which are respectively embedded in the peripheral inner wall of the relative displacement clearance.

3. The intelligent seismic resistance system for new energy prefabricated substations according to claim 2, characterized in that, The first flange connecting plate has a spherical boss at its center, and the second flange connecting plate has a concave guide groove at its center that matches the spherical boss. The relative displacement clearance exists between the outer wall of the spherical boss and the inner wall of the concave guide groove. The magnetorheological damping elastic core is sealed and filled in the relative displacement clearance and wraps around the spherical boss. The annular excitation coil is wound at equal intervals along the circumference of the concave guide groove. The multiple sets of piezoelectric ceramic sheets are respectively fixedly attached to the outermost apex and the surrounding force-bearing sides of the spherical boss.

4. The intelligent seismic resistance system for new energy prefabricated substations according to claim 1, characterized in that, The electrical distribution layer also includes an energy storage capacitor connected to the constant current source module. The uninterruptible power supply module is electrically connected to the energy storage capacitor and outputs compensation power to the constant current source module when the main power supply circuit is disconnected. The micro-vibration linkage controller includes a waveform recognition module, which performs bandpass filtering on the high-frequency piezoelectric signal output by the piezoelectric micro-vibration sensor array.

5. The intelligent seismic resistance system for new energy prefabricated substations according to claim 4, characterized in that, The micro-vibration linkage controller further includes a trigger drive module, which is electrically connected to the waveform recognition module and the fast trip coil of the main circuit breaker. The trigger drive module is configured to generate a trip pulse with a duration of a first preset duration when the waveform recognition module determines that the frequency of the first high-frequency piezoelectric signal cycle is greater than a first frequency threshold and the amplitude exceeds a first voltage threshold, thereby closing the DC circuit built into the micro-vibration linkage controller, driving the fast trip coil to operate and cutting off the main power supply circuit.

6. The intelligent seismic resistance system for new energy prefabricated substations according to claim 1, characterized in that, The piezoelectric microvibration sensing array is made of piezoelectric material, which includes lead magnesium niobate-lead titanate solid solution.

7. A control method for an intelligent seismic-resistant system of a new energy prefabricated substation, applied to the intelligent seismic-resistant system of the new energy prefabricated substation as described in any one of claims 1 to 6, characterized in that, include: The high-frequency piezoelectric voltage signal output by the piezoelectric micro-vibration sensor array is acquired and sampled to obtain discrete voltage data; Based on the discrete voltage data, the main frequency is extracted and the waveform is identified. When it is determined that the current waveform is a seismic P-wave with a main frequency greater than the P-wave frequency threshold, a tripping pulse command is sent to the fast tripping coil of the main circuit breaker. Extract the integral value of the voltage signal of the seismic P-wave, and determine the target excitation current based on the integral value of the voltage signal; The constant current source module is controlled to output the target excitation current to the ring excitation coil.

8. The control method for the intelligent seismic-resistant system of the new energy prefabricated substation according to claim 7, characterized in that, The process of extracting the dominant frequency and identifying the waveform based on the discrete voltage data includes: The discrete voltage data is subjected to a fast Fourier transform to obtain the frequency domain energy spectrum; the frequency corresponding to the peak value is extracted from the frequency domain energy spectrum as the dominant frequency; the dominant frequency is compared with a pre-stored P-wave frequency threshold, and when the dominant frequency is higher than the P-wave frequency threshold, the arrival event of the seismic P-wave is determined to have occurred.

9. The control method for the intelligent seismic-resistant system of the new energy prefabricated substation according to claim 7, characterized in that, The step of extracting the integrated voltage signal value of the seismic P-wave and determining the target excitation current based on the integrated voltage signal value includes: The high-frequency piezoelectric voltage signal within the first preset time window after the arrival of the seismic P-wave is determined to be an absolute value integral calculation to obtain the microseismic energy accumulation characteristic value; the microseismic energy accumulation characteristic value is multiplied by a preset compensation coefficient and superimposed with the foundation sustaining current to obtain the target excitation current.

10. The control method for the intelligent seismic-resistant system of the new energy prefabricated substation according to claim 9, characterized in that, The step of extracting the integrated voltage signal value of the seismic P-wave and determining the target excitation current based on the integrated voltage signal value further includes: The target excitation current is compared with the rated maximum current of the toroidal excitation coil. When the target excitation current is greater than the rated maximum current, the rated maximum current is used as the final excitation current command value. When the target excitation current is less than or equal to the rated maximum current, the target excitation current is used as the final excitation current command value. Within a second preset time window after confirming the issuance of the trip pulse command to the main circuit breaker, a drive signal containing the final excitation current command value is sent to the constant current source module.

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