An active core surge suppressor configuration method based on transient simulation model

Abstract

The application belongs to the field of surge protection of direct current high-voltage power supply, and specifically discloses a configuration method of active core surge suppressor based on transient simulation model. The application firstly establishes a transient simulation model containing an actual short-circuit module, accurately obtains system short-circuit parameters to provide real working condition basis. Based on the dynamic parameters, the core structure is selected, and combined with the system rated value, the secondary side branch parameters are determined, so that the core characteristics of the suppressor are matched with the actual transient threat. Further, the parameters are integrated back to the original model to build a second simulation model containing the suppressor, realizing the deep integration of the system model and the suppressor and overcoming the disconnection problem. Finally, the suppressor parameters are verified and iterated through simulation, forming a closed loop. The application replaces experience estimation with quantitative simulation, ensures that the final configuration parameters are verified by system-level transient, and realizes the precise matching of the suppressor and the direct current high-voltage power supply system, thereby significantly improving the reliability and protection effect of surge suppression.

Description

Technical Field

[0001] This application belongs to the field of DC high voltage power supply surge protection, specifically involving a configuration method for an active iron core surge suppressor based on a transient simulation model. Background Technology

[0002] DC high-voltage power supplies are widely used in neutral beam injection systems of tokamak devices, particle accelerators, high-voltage test equipment, vacuum electronic equipment, and other high-voltage, high-power load applications. These systems typically consist of a DC high-voltage generator, output filter, high-voltage transmission line, and high-voltage load. Due to the high output voltage, long transmission line, and complex insulation structure of DC high-voltage power supplies, distributed parameters such as ground capacitance, inter-conductor coupling capacitance, stray inductance, and line resistance are unavoidable in the system.

[0003] When a high-voltage load experiences breakdown, arcing, or a short circuit, the load-side voltage drops rapidly within microseconds. The energy stored in the DC high-voltage power supply's output filter capacitor, transmission line distributed capacitance, and stray capacitance on the load side is quickly released through the short-circuit path, forming a surge current with high amplitude, high rise rate, and wide frequency spectrum characteristics. This surge current not only damages the high-voltage load itself but may also propagate along the transmission line to the power supply side, causing overvoltage and overcurrent stress on the high-voltage rectifier, isolation transformer, inverter, or protection switch.

[0004] To limit short-circuit inrush current, iron-core surge suppressors are often installed on the outside of high-voltage output conductors or transmission line conductors in engineering. Iron-core surge suppressors utilize the eddy current loss, hysteresis loss, and magnetizing inductance effect of ferromagnetic materials during transient magnetization to limit the rise of short-circuit current and dissipate fault energy. Traditional iron-core surge suppressors often employ passive design methods, determining the core size and number based on distributed capacitance energy storage, volt-second product, or empirical formulas. While this method is simple, it typically separates the core design from the transient short-circuit process of the DC high-voltage power supply load, making it difficult to accurately reflect the impact of power supply turn-off delay, transmission line distributed parameters, output filters, short-circuit location, and load short-circuit dynamic impedance on the surge process.

[0005] On the other hand, the core material exhibits nonlinear, time-varying, and saturation characteristics. During normal operation of the DC high-voltage power supply, the load DC current induces a bias magnetism in the core; during a load short circuit, the short-circuit current causes rapid changes in the core's magnetic flux, potentially leading to saturation. Premature saturation significantly reduces the core's current-limiting and energy-dissipating capabilities. To improve core utilization and reduce size, secondary windings, bias power supplies, energy-dissipating resistors, and controlled switching devices can be installed on the core to form an active core surge suppressor. This type of suppressor requires simultaneous design of core structural parameters, secondary winding parameters, bias parameters, energy-dissipating branch parameters, and control timing. With numerous design variables, lacking joint simulation with the load short-circuit transient model can easily lead to problems such as excessive core quantity, secondary branch overload, unreasonable control timing, or failure to meet short-circuit protection requirements. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this application is to provide a configuration method for active core surge suppressors based on transient simulation models, aiming to solve the problems in existing core surge suppressor designs, such as the disconnect between the system transient model and core parameter configuration, the reliance on experience for active branch parameters, and the difficulty in accurately evaluating the protection effect.

[0007] The first aspect of this application relates to a method for configuring an active core surge suppressor based on a transient simulation model, comprising: step S10, establishing a first simulation model of the DC high voltage power supply load short-circuit transient based on the system rated parameters of the DC high voltage power supply system and performing simulation to obtain the system short-circuit parameters at the moment of load short-circuit triggering; the first simulation model includes a power supply module, a transmission line module, and a load short-circuit module; step S20, selecting the core structure parameters of the active core surge suppressor module based on the system short-circuit parameters, and determining the secondary side branch parameters of the active core surge suppressor module based on the system rated parameters; step S30, adding the active core surge suppressor module to the first simulation model based on the core structure parameters and the secondary side branch parameters to generate a second simulation model; step S40, simulating the second simulation model to obtain the system operating parameters at the moment of load short-circuit triggering; and adjusting the core structure parameters and secondary side branch parameters when the system operating parameters do not meet the preset conditions, until the system operating parameters meet the preset conditions, and then outputting the current core structure parameters and the current secondary side branch parameters to configure the active core surge suppressor.

[0008] In one embodiment, the excitation branch of the active core surge suppressor module is represented by an equivalent time-varying magnetizing inductance and an equivalent time-varying eddy current resistance connected in parallel; the secondary branch of the active core surge suppressor module is represented by a circuit topology including a secondary winding, a bias power supply, and a power dissipation resistor.

[0009] In one embodiment, step S20, selecting the core structure parameters of the active core surge suppressor module based on the system short-circuit parameters, includes: extracting the peak short-circuit current, load injected energy, transmission line voltage fluctuation, and power supply-side transient electrical stress from the system short-circuit parameters; determining the short-circuit current peak limit target, load injected energy limit target, and core volt-second withstand capability based on the short-circuit current peak limit target, load injected energy limit target, transmission line voltage fluctuation, and power supply-side transient electrical stress; and then determining the core structure parameters of the active core surge suppressor based on the short-circuit current peak limit target, load injected energy limit target, and core volt-second withstand capability.

[0010] In one embodiment, step S20, determining the secondary branch parameters of the active core surge suppressor module based on the system rated parameters includes: extracting the normal operating current from the system rated parameters; determining the secondary branch parameters of the active core surge suppressor based on the normal operating current, core pre-magnetization requirements, and load short-circuit transient energy dissipation requirements; the secondary branch parameters include the number of turns in the secondary winding, conductor cross-sectional area, winding resistance, insulation class, bias power supply current, bias power supply voltage, energy dissipation resistor, rated voltage and current of the controlled switching devices, and control timing.

[0011] In one embodiment, step S30 specifically involves: obtaining the equivalent time-varying magnetizing inductance and equivalent time-varying eddy current resistance parameters based on the core structure parameters to construct the excitation branch, and constructing the secondary side branch based on the secondary side branch parameters; connecting the excitation branch and the secondary side branch into the first simulation model to generate the second simulation model.

[0012] In one embodiment, obtaining the equivalent time-varying magnetization inductance and equivalent time-varying eddy current resistance parameters based on the core structure parameters includes: determining the saturation region thickness of each layer of the core strip of the active core surge suppressor based on saturation wave theory; and obtaining the equivalent time-varying magnetization inductance and equivalent time-varying eddy current resistance based on the saturation region thickness of each layer of the core strip and the core structure parameters.

[0013] In one embodiment, the iteration in step S40 includes simulating the changes in equivalent time-varying magnetizing inductance and equivalent time-varying eddy current resistance using a discrete recursive method or a controlled voltage source method. Specifically, the discrete recursive method involves: recursively updating the saturation region thickness of the first layer of the core strip based on the simulation sampling period and the excitation branch voltage of the previous sampling period; obtaining the saturation region thickness of each layer of the strip in the current sampling period based on the updated saturation region thickness of the first layer of the strip; and obtaining the values ​​of the equivalent time-varying magnetizing inductance and equivalent time-varying eddy current resistance in the current sampling period based on the saturation region thickness of each layer of the strip in the current sampling period.

[0014] The second aspect of this application relates to an active core surge suppressor configuration device, comprising: a first modeling and simulation module, used to establish and simulate a first simulation model of the DC high voltage power supply load short-circuit transient based on the system rated parameters of the DC high voltage power supply system, and obtain the system short-circuit parameters at the load short-circuit triggering time; a parameter configuration module, used to select the initial core structure parameters of the active core surge suppressor module based on the system short-circuit parameters, and determine the secondary side branch parameters of the active core surge suppressor module based on the system rated parameters; and a second modeling and simulation module, used to configure the initial core structure parameters based on the initial core structure parameters. The system parameters, including the number of core components and secondary branch parameters, are integrated into the first simulation model to generate the second simulation model and perform simulation. The iterative optimization module is used to obtain the system operating parameters of the second simulation model at the moment of load short circuit triggering. When the system operating parameters do not meet the preset constraints, the initial core structure parameters and / or secondary branch parameters are adjusted, and the second modeling and simulation module is triggered to regenerate the model and perform simulation until the system operating parameters meet the preset constraints. Then, the current core structure parameters and the current secondary branch parameters are output to configure the active core surge suppressor.

[0015] Thirdly, this application provides an electronic device, comprising: at least one memory for storing a program; and at least one processor for executing the program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to execute the method described in the first aspect or any possible implementation thereof.

[0016] Fourthly, this application provides a computer-readable storage medium storing a computer program that, when run on a processor, causes the processor to perform the method described in the first aspect or any possible implementation thereof.

[0017] Fifthly, this application provides a computer program product that, when run on a processor, causes the processor to perform the method described in the first aspect or any possible implementation thereof.

[0018] It is understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here.

[0019] Overall, the technical solutions conceived in this application have the following beneficial effects compared with the prior art: The technical solution proposed in this application effectively solves the problems of disconnect and reliance on experience in the current design and evaluation by integrating the transient system model with the surge suppressor parameter design in a closed loop, with system simulation as the core driving force.

[0020] Specifically, firstly, by establishing and simulating a first-stage simulation model of a DC high-voltage power supply load short-circuit transient condition including an actual short-circuit module, the original system short-circuit parameters at the moment of load short-circuit triggering were accurately obtained. This solves the problem of initial data distortion caused by missing or inaccurate models in existing methods, providing a reliable benchmark condition for subsequent suppressor design. Based on this, when selecting the core structure parameters of the active core surge suppressor, the general design specifications are no longer relied upon. Instead, targeted matching is performed based on the dynamic short-circuit parameters (such as peak short-circuit current and rate of rise) obtained from the aforementioned simulation, thereby making the core characteristics physically compatible with the actual transient threats to the system. At the same time, the parameters of the secondary active branch are also determined based on the system rated parameters, ensuring basic compatibility with the static characteristics of the power supply system.

[0021] Furthermore, the scientifically selected core and branch parameters are directly fed back and integrated into the first simulation model to construct a second simulation model containing the suppressor. This fundamentally integrates the suppressor parameter design with the system transient model, directly overcoming the disconnect between the independent design of the system model and the suppressor parameters, which are simply superimposed at the end.

[0022] Finally, the second simulation model is simulated, and based on the comparison between the output system operating parameters (such as suppressed overvoltage, current stress, etc.) and the preset protection indicators, the core and branch parameters are dynamically and iteratively adjusted. This process forms an automated closed loop of modeling, configuration, simulation verification, and parameter optimization. This not only makes the evaluation of the protection effect quantitative and intuitive, avoiding the errors caused by traditional reliance on experience and simplified calculations, but more importantly, it ensures that the final output configuration parameters are the optimal solution verified by system-level transients.

[0023] In summary, this method replaces the experience-based step-by-step design with simulation-driven closed-loop parameter optimization, achieving precise matching between the surge suppressor and the specific DC high-voltage power supply system at both transient and steady-state levels, thereby significantly improving the reliability and effectiveness of the protection. Attached Figure Description

[0024] Figure 1 This is a flowchart illustrating the configuration method of the active iron core surge suppressor provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the second simulation model provided in the embodiments of this application; Figure 3 This is a detailed flowchart of the configuration of the active iron core surge suppressor provided in the embodiments of this application; Figure 4 This is a detailed flowchart of the configuration iteration of the active iron core surge suppressor provided in the embodiments of this application; Figure 5This is a schematic diagram of the active iron core surge suppressor configuration device provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0026] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. In this application, the symbol " / " indicates that the related objects are in an "or" relationship, for example, A / B means A or B.

[0027] In this application, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order of objects. For example, "first response message" and "second response message," etc., are used to distinguish different response messages, not to describe a specific order of response messages.

[0028] In this application, the term "electrical connection" can refer to a direct circuit connection or a signal transmission via a communication protocol.

[0029] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0030] In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more, for example, multiple processing units means two or more processing units, multiple elements means two or more elements, etc.

[0031] Currently, existing surge suppressor designs suffer from several problems: a disconnect between the system transient model and the core parameter configuration; reliance on experience for active branch parameters; and difficulty in accurately evaluating the protection effect.

[0032] Based on this, this application presents a configuration method for an active iron core surge suppressor based on a transient simulation model. Please refer to... Figure 1 , Figure 1 This is a schematic flowchart of the active iron core surge suppressor configuration method provided in the embodiments of this application.

[0033] In this embodiment, the configuration method includes: Step S10: Based on the rated parameters of the DC high voltage power supply system, establish a first simulation model of the DC high voltage power supply load short-circuit transient and perform simulation to obtain the system short-circuit parameters at the moment of load short-circuit triggering; the first simulation model includes a power supply module, a transmission line module and a load short-circuit module.

[0034] It should be noted that step S10 involves the establishment and simulation of the first simulation model of the DC high-voltage power supply load short-circuit transient. The system rated parameters are the nominal electrical characteristics of the DC high-voltage power supply system under steady-state conditions, typically including but not limited to rated output voltage, rated output current, rated power, and system internal resistance.

[0035] It should be noted that establishing the first simulation model refers to constructing a circuit topology capable of simulating the transient behavior of an actual system using circuit simulation software such as PSpice, MATLAB / Simulink, or PLECS, utilizing the software's component library or custom model functionality. The power supply module simulates a DC high-voltage power supply, which can be specifically implemented as a series model of a controlled voltage source and its internal resistance, or a more detailed multi-stage converter model. The transmission line module simulates the connection cable between the power supply and the load, typically implemented as a distributed parameter or lumped parameter RLC network to reflect the influence of line inductance and resistance on the transient process. The load short-circuit module simulates a short-circuit fault occurring at the load end, which can be implemented using a time-controlled ideal switch or a semiconductor switch model with a predefined on-resistance, and its triggering time can be precisely set.

[0036] It should be noted that the model parameters required for building the power supply module, transmission line module, and load short-circuit module are all based on or derived from the actual physical characteristics and design requirements of the DC high-voltage power supply system. These parameters specifically include, but are not limited to: those used to define the rated output voltage, rated output current, and output filtering parameters of the DC high-voltage power supply for the power supply module, such as the capacitance and equivalent series resistance of the filter capacitor and the inductance of the filter inductor; those used to define the physical length of the transmission line, the distributed capacitance per unit length of the transmission line, the stray inductance per unit length of the transmission line, and the line resistance for the transmission line module; and those used to define the equivalent parameters of the load short circuit (such as the contact resistance at the short-circuit point) and the power-off delay time for simulating the power supply protection response for the load short-circuit module. These parameters form the basis for establishing a high-fidelity transient simulation model and can all be obtained from system design drawings, component datasheets, or through actual measurements, ensuring that the first simulation model accurately reflects the dynamic characteristics of the actual system.

[0037] Furthermore, to more accurately simulate the actual system, an output filter module can be configured after the power supply module. This output filter module typically consists of capacitors and inductors, used to simulate the filtering network present inside the power supply or at the output terminal. In the simulation model, this module can be specifically implemented as an LC or CLC filter circuit. Adding this module allows for a more realistic depiction of the energy release stored in the filter elements and its interaction with the short-circuit loop during transient processes, resulting in more comprehensive and accurate acquisition of system short-circuit parameters. This design demonstrates the flexibility and completeness of the modeling, providing a more reliable foundation of operating condition data for further suppressor design.

[0038] Understandably, by performing time-domain simulation on this model, the system short-circuit parameters at the moment of load short-circuit triggering can be obtained. These key parameters include, but are not limited to: the initial peak value of the short-circuit current, the rate of current rise (di / dt), and the voltage drop depth and waveform on the system bus. The core effect and benefit of this step is that it constructs an accurate original system transient baseline model, providing a real and quantitative data foundation for solving the problem of the disconnect between suppressor design and actual system transient characteristics in existing technologies, thus making subsequent designs more targeted.

[0039] Step S20: Select the core structure parameters of the active core surge suppressor module according to the system short-circuit parameters, and determine the secondary branch parameters of the active core surge suppressor module according to the system rated parameters.

[0040] It should be noted that an active core surge suppressor module typically includes a core inductor and a coupled secondary active branch. The core structural parameters are selected based on the dynamic system short-circuit parameters obtained from simulation in step S10, specifically including the core material (e.g., ferrite, amorphous alloy, nanocrystalline), core cross-sectional area, magnetic circuit length, and saturation flux density. For example, if the short-circuit current rise rate is very high, a magnetic material with high saturation flux density and good high-frequency characteristics needs to be selected, and a smaller cross-sectional area may be designed to achieve rapid saturation.

[0041] It should be noted that the secondary side branch parameters are determined based on the system's rated parameters. This branch typically includes a circuit consisting of power semiconductor switches (such as IGBTs and MOSFETs) and damping components (resistors and capacitors). Its parameters mainly include the branch's operating voltage level (which must match the system's rated voltage), the rated current of the switching devices, the resistance and power capacity of the damping resistors, and the possible value of the buffer capacitors.

[0042] Understandably, the technical effect of this step is that it breaks the limitations of traditional design that relies on empirical formulas or static parameters to select the core and branches, making the core physical structure of the suppressor match the dynamic threat of the system, while making the active circuit part compatible with the steady-state electrical level of the system, thus providing a scientific basis for constructing an effective and safe initial suppressor scheme.

[0043] Step S30: Based on the core structure parameters and secondary side branch parameters, add an active core surge suppressor module to the first simulation model to generate the second simulation model.

[0044] It should be noted that, based on the core structure parameters and secondary branch parameters, the parameters calculated or selected in step S20 are assigned to the corresponding suppressor sub-model in the simulation software. Specifically, in the simulation environment, the core inductance can be modeled as a nonlinear inductance model, whose magnetization curve is defined by the selected core material parameters; the secondary active branch is constructed as an actual circuit topology including switching devices, resistors, and capacitors. Subsequently, adding the active core surge suppressor module to the first simulation model means connecting the suppressor sub-model in an appropriate way, usually in series with the main circuit or in parallel with the node that needs protection, into the original system model established in step S10, thereby forming a new system model containing a complete protection device, namely the second simulation model.

[0045] Understandably, this constructs an integrated simulation and verification platform for the system and the suppressor, fundamentally solving the disconnect between the separate design of the system model and the suppressor model, which are simply superimposed in the final stage. This allows the actual protective effect of the suppressor to be evaluated within a unified and collaborative simulation framework.

[0046] Specifically, this application provides a specific implementation. The excitation branch of the active iron core surge suppressor module is represented by an equivalent time-varying magnetizing inductance and an equivalent time-varying eddy current resistance connected in parallel; the secondary branch of the active iron core surge suppressor module is represented by a circuit topology including a secondary winding, a bias power supply, and a power dissipation resistor.

[0047] In the active iron core surge suppressor module, the excitation branch is represented by the parallel connection of the equivalent time-varying magnetization inductance and the equivalent time-varying eddy current resistance. Here, the excitation branch represents the electrical behavior of the iron core inductance considering magnetization and eddy current effects. The equivalent time-varying magnetization inductance is used to simulate the nonlinearity of the iron core's magnetization characteristics; its inductance value varies with time and is essentially a function of the magnetic flux density (B) or magnetic field strength (H) in the iron core, reflecting the saturation characteristics of the iron core. For example, in simulation, this can be achieved using a nonlinear inductance model controlled by a BH curve data table of the iron core material. The equivalent time-varying eddy current resistance is used to simulate the eddy current loss effect in the iron core caused by the alternating magnetic field; its resistance value is usually frequency-dependent and can also be considered time-varying. In simulation modeling, a frequency-dependent resistance model or a piecewise linear resistance can be used for approximation. Connecting the two in parallel allows for a more comprehensive characterization of the dynamic behavior of the iron core under transient high currents, including the magnetic saturation process and the accompanying heat loss effects.

[0048] The advantage of using a parallel structure in this implementation is that it provides a model that strikes a balance between simulation accuracy and computational complexity, enabling more realistic prediction of the electrical stress and thermal behavior of the suppressor core during actual transient processes, and providing a more reliable computational basis for subsequent parameter optimization.

[0049] The secondary side branch represents the circuit topology including the secondary winding, bias power supply, and energy-dissipating resistor. This is a concretization of the active control and energy dissipation part of the module. In the simulation model, the secondary winding is represented as a coupled inductor with a specific turns ratio to the excitation branch (core), serving as the physical basis for energy transfer from the primary main circuit to the secondary branch. The bias power supply is a controllable or fixed DC voltage or current source, its function being to provide a preset bias magnetomotive force or energy to the secondary circuit, used to adjust the core's operating point in the early stages of a fault or to provide initial energy to the energy-dissipating circuit. For example, it can be a simulation model of a programmable DC power supply. The energy-dissipating resistor is a resistive element connected in series or parallel in the secondary circuit, its core function being to dissipate the surge energy transferred from the primary side, converting it into heat. In the simulation model, it is a resistor model with a specific power rating. The circuit topology of the entire secondary branch means that these components are connected in a specific way, for example, the secondary winding, a bias power supply controlled by a switch, and the energy-consuming resistor are connected in parallel to form a loop.

[0050] Understandably, during the normal operation of the DC high-voltage power supply, the bias power supply provides a reverse bias current to the secondary winding, so that the iron core is in a preset reverse magnetization state; during the load short circuit stage, a short circuit current flows through the energy-consuming resistor, so that part of the system's transient energy is consumed in the energy-consuming resistor.

[0051] The advantage of this explicit topology implementation is that it transforms the abstract active branch parameters into concrete, simulation-verifiable circuits, allowing active control strategies (such as bias timing) and energy dissipation capabilities to be directly tested and optimized in the second simulation model, thereby accurately evaluating their suppression effect on main circuit surges.

[0052] Based on this implementation method, step S20 can be further refined.

[0053] The selection of core structure parameters for the active core surge suppressor module based on system short-circuit parameters includes: extracting peak short-circuit current, load injected energy, transmission line voltage fluctuation, and power supply-side transient electrical stress from the system short-circuit parameters; determining the peak short-circuit current limit target, load injected energy limit target, and core volt-second withstand capability based on the peak short-circuit current, load injected energy, transmission line voltage fluctuation, and power supply-side transient electrical stress; and then determining the core structure parameters of the active core surge suppressor based on the peak short-circuit current limit target, load injected energy limit target, and core volt-second withstand capability.

[0054] It is understandable that the load-injected energy here refers to the total energy released from the magnetic field energy stored in the transmission line distributed inductance and system filter inductance to the short-circuit point at the moment of load short circuit; the transient electrical stress on the power supply side mainly refers to the overcurrent and overvoltage stress borne by the power devices inside the power supply during the short circuit.

[0055] Understandably, the characteristics of system faults are transformed into the core protection objectives of the suppressor: short-circuit current peak limit target, that is, the suppressor must suppress the expected short-circuit current peak to a safe level; load injection energy limit target, that is, the fault energy value that the suppressor must absorb or transfer; core volt-second withstand capability, that is, the product of the voltage and the duration that the suppressor core can withstand before saturation, which is directly related to the effective operating window of the suppressor in the transient process.

[0056] Specifically, based on the short-circuit current peak limit target and the core's volt-second withstand capability, the core's magnetic circuit cross-sectional area and saturation flux density can be determined to ensure that the core can quickly enter the saturation region under the target current limit, exhibiting low impedance to limit further current growth. Based on the load injection energy limit target, combined with the core material characteristics, such as unit volume loss, the required effective volume of the core can be estimated or verified to ensure that it can withstand and dissipate (through eddy currents, hysteresis, etc.) some of the fault energy without overheating and damage.

[0057] Understandably, the core structure parameters are thus specifically determined, mainly including the core material type (such as selecting silicon steel, amorphous, nanocrystalline, etc. based on saturation magnetic flux density and loss characteristics), core cross-sectional area, magnetic circuit length, and number of winding turns. An alternative simplification method is that, in situations where energy requirements are not high, the core cross-sectional area and material can be selected primarily based on the volt-second product and peak current limitations.

[0058] Understandably, this refinement step anchors the design of the suppressor's core component (core) directly from relying on empirical formulas to specific quantitative indicators of system transients obtained from simulations. This enables the physical structure of the core to accurately match the dynamic protection requirements of the system, laying the foundation for reliable current limiting and energy management.

[0059] The determination of the secondary branch parameters of the active core surge suppressor module based on the system rated parameters includes: extracting the normal operating current from the system rated parameters; determining the secondary branch parameters of the active core surge suppressor based on the normal operating current, core pre-magnetization requirements, and load short-circuit transient energy dissipation requirements; the secondary branch parameters include the number of turns of the secondary winding, conductor cross-sectional area, winding resistance, insulation class, bias power supply current, bias power supply voltage, energy dissipation resistor, rated voltage and current of the controlled switching devices, and control timing.

[0060] It should be noted that this method also follows a clear logical chain for determining the secondary branch parameters. Extracting the normal operating current from the system's rated parameters is the foundation of the design, as it determines the current that flows continuously through the primary winding of the suppressor, directly affecting the winding's heating and design. Determining the secondary branch parameters of the active core surge suppressor based on the normal operating current, core pre-magnetization requirements, and load short-circuit transient energy dissipation requirements is the core of parameter calculation. Specifically, the core pre-magnetization requirement refers to the preset bias magnetomotive force provided by the secondary branch to ensure the core is in a specific initial magnetization state (e.g., close to saturation to improve response speed) during normal system operation; the load short-circuit transient energy dissipation requirement corresponds to the portion of fault energy that needs to be dissipated or transferred by the secondary branch. Based on these three factors, the secondary branch parameters can be systematically determined.

[0061] Understandably, the number of turns in the secondary winding, conductor cross-sectional area, winding resistance, and insulation class are mainly determined by the ampere-turns corresponding to the normal operating current, the bias ampere-turns corresponding to the core premagnetization requirements, and the system rated voltage. The number of turns affects the coupling coefficient and voltage transformation ratio; the conductor cross-sectional area is selected based on the current thermal effect; and the insulation class must match the system voltage.

[0062] Understandably, the bias power supply current and bias power supply voltage are directly calculated from the iron core premagnetization requirements to provide the required DC bias magnetomotive force, and their specifications determine the selection of the bias power supply.

[0063] Understandably, the resistance and power rating of a power dissipation resistor are primarily determined by the transient energy dissipation demand during a short circuit. The resistance value needs to be calculated based on the expected energy transferred to the secondary side and the required dissipation time, and the power rating of the resistor should be selected according to the energy and power requirements.

[0064] Understandably, the rated voltage of controlled switching devices (such as IGBTs) must be higher than the sum of the bias power supply voltage and the fault reflected voltage, and the rated current must be greater than the bias current and the peak value of the transient current of the energy dissipation circuit; its control timing logic (such as triggering the turn-on time and the turn-off time) is designed according to the suppression strategy (such as triggering immediately after fault detection).

[0065] Understandably, this refinement step binds all the key electrical and structural parameters of the secondary active branch to the explicit system operating conditions (normal current) and transient requirements (pre-magnetization, energy consumption) derived from the first simulation model, so that the design of the active control loop is completely free from trial and error based on experience, and each parameter has a clear design basis and optimization direction.

[0066] At this point, step S30 specifically involves: obtaining the equivalent time-varying magnetizing inductance and equivalent time-varying eddy current resistance parameters based on the core structure parameters to construct the excitation branch, and constructing the secondary side branch based on the secondary side branch parameters; connecting the excitation branch and the secondary side branch into the first simulation model to generate the second simulation model.

[0067] As is understandable, the above construction of the excitation branch and secondary side branch, and their connection to the model, is intuitive and clear, and will not be elaborated upon here. The core lies in obtaining the equivalent time-varying magnetization inductance and equivalent time-varying eddy current resistance parameters based on the core structure parameters, including: determining the saturation region thickness of each layer of the core strip of the active core surge suppressor based on saturation wave theory; and obtaining the equivalent time-varying magnetization inductance and equivalent time-varying eddy current resistance based on the saturation region thickness of each layer of the core strip and the core structure parameters.

[0068] It should be noted that, please refer to Figure 3 , Figure 3 This is a detailed flowchart of the active iron-core surge suppressor configuration provided in the embodiments of this application. System rated parameters include rated output voltage. Rated output current Output filter capacitor, filter capacitor current-limiting resistor, output filter inductor, transmission line length l, distributed capacitance per unit length of transmission line stray inductance per unit length Resistance per unit length Equivalent resistance characterizing the short-circuit arc dissipation effect of the load Power off delay time and the load allows for energy injection .

[0069] It should be noted that the equivalent distributed capacitance and stray inductance of the transmission line are calculated based on the transmission line length and unit length parameters: ; .

[0070] Then, by combining the stray parameters on the power supply output side and the load side, the equivalent distributed capacitance of the system is obtained. and equivalent stray inductance .

[0071] Before the load is short-circuited, the energy stored in the system's distributed capacitance is: .

[0072] The stray inductance energy storage of the system is: .

[0073] It should be noted that when Significantly greater than When the system's distributed capacitance energy storage is used as the main energy absorption design basis for the active iron core surge suppressor, when the two are on the same order of magnitude, distributed capacitance energy storage and stray inductance energy storage should be considered simultaneously.

[0074] It should be noted that the core structure parameters include the core strip type and saturation magnetic induction intensity. Residual magnetic flux density Relative permeability resistivity Coercivity strip thickness , strip width W, strip interlayer insulation thickness and strip interlayer insulation withstand voltage value.

[0075] Understandably, an active iron-core surge suppressor is installed on the outside of the DC high-voltage output conductor or transmission line conductor. Its primary side is a high-voltage conductor passing through the center of the iron core, with an equivalent number of turns of 1 turn; its iron core is composed of several cascaded toroidal iron cores, each formed by winding soft magnetic alloy strip. A secondary winding is set on the outside of the iron core, and the secondary winding is connected to the bias power supply, energy-consuming resistor, and controlled switching device.

[0076] Understandably, during normal operation, the bias power supply injects a reverse bias current into the secondary winding, causing the core to be in a preset reverse magnetization state. This state increases the amount of change in magnetic flux density available to the core when the load is short-circuited, thereby improving the surge suppression capability per unit volume of the core.

[0077] Understandably, during a load short circuit, the short-circuit current flows through the core conductor, causing a rapid change in the core's magnetic flux. At this time, eddy currents form in the core strip, generating losses. Simultaneously, the core magnetization process inductively suppresses the rise of the short-circuit current. An induced voltage is generated in the secondary winding, and the controlled switching device engages the energy-dissipating resistor, transferring and dissipating some of the surge energy in the secondary branch.

[0078] It is understandable that active iron-core surge suppressors include Each cascaded iron core consists of [number] iron cores, each iron core consisting of [number] cascaded iron cores. Formed by winding layers of soft magnetic alloy strip; The winding radius of the layered strip is: .

[0079] in, The inner radius of the iron core, This is the equivalent radial pitch of the strip; when the interlayer insulation thickness is ignored... .

[0080] Understandably, saturation wave theory is a theory for analyzing the internal magnetization process of ferromagnetic materials under rapid pulse magnetization. When a surge current is injected into the winding, the saturation of the core does not occur instantaneously across the entire cross-section, but rather propagates from the surface to the interior in the form of a wave.

[0081] At this point, let the first... The saturation region thickness of the strip is The thickness of the saturation zone of the first strip is Then, under the saturation wave approximation condition, the following holds: .

[0082] in, When it is less than, the first n The strip material is not yet fully saturated and still participates in the magnetization energy storage and eddy current energy dissipation calculations of the excitation branch; when At that time, the judgment of the first When a layer of tape enters a fully saturated state, the effective magnetization thickness of the layer can be taken as the remaining value after saturation, or the layer can be removed from the set of unsaturated tapes.

[0083] At this time, the The equivalent eddy current resistance of the strip material is: .

[0084] in, This is the eddy current path correction factor. The resistivity of the iron core strip. For strip width, For the first Layered strip winding radius, Let be the thickness of the saturated region of the (n)th strip layer.

[0085] Finally, the equivalent time-varying eddy current resistance of the excitation branch of the active core surge suppressor is: .

[0086] At this time, the The equivalent magnetizing inductance of the strip material is: .

[0087] in, The permeability of free space, The relative permeability of the iron core strip. For the first The effective magnetization thickness of the strip material is taken as follows: .

[0088] Finally, the equivalent time-varying magnetizing inductance of the excitation branch of the active iron-core surge suppressor is: .

[0089] Secondary side branch configuration: During normal operation, the bias power supply injects reverse bias current into the secondary winding. I b This causes the iron core to enter a reverse pre-magnetized state. Let the number of turns in the secondary winding be... N 2. The equivalent number of turns of the primary through-core conductor is N 1. The rated output current of the DC high-voltage power supply is I 0, the minimum magnetic field strength required for the iron core to enter the preset reverse magnetization state is H rmin The secondary winding is then determined based on the magnetomotive force balance relationship, satisfying: .

[0090] The secondary winding resistance is: .

[0091] in, The resistivity of the secondary winding conductor. l b This refers to the length of the secondary winding conductor. S b This represents the cross-sectional area of ​​the secondary winding conductor.

[0092] Bias supply voltage U b Should meet: .

[0093] During the load short circuit phase, the controlled switching device operates based on the short circuit detection signal, switching the energy-consuming resistor... R dThe secondary winding circuit is engaged. The short-circuit current changes rapidly in the primary conductor, generating a rapidly changing magnetic flux in the iron core, and inducing a voltage in the secondary winding. This induced voltage drives the secondary winding current to flow through the energy-dissipating resistor, causing the surge energy to be transferred and consumed in the energy-dissipating branch.

[0094] Energy-consuming resistor R d The energy absorbed is: .

[0095] in, t b The start time of the short circuit. t e The end time of the short-circuit transient calculation. This is the current flowing through the energy-consuming resistor on the secondary side.

[0096] Finally, the completed second simulation model is as follows: Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of the second simulation model provided in the embodiments of this application. Further details are omitted here.

[0097] Step S40: Simulate the second simulation model to obtain the system operating parameters at the moment of load short circuit triggering; and adjust the core structure parameters and secondary side branch parameters when the system operating parameters do not meet the preset conditions until the system operating parameters meet the preset conditions, and then output the current core structure parameters and the current secondary side branch parameters to configure the active core surge suppressor.

[0098] Understandably, the second simulation model is subjected to a load short-circuit simulation under the same conditions as in step S10 to obtain the system operating parameters at the moment of load short-circuit triggering. These system operating parameters are the result after suppression measures have been applied, mainly including the suppressed bus overvoltage amplitude, the current stress of the protected devices, and the energy consumption of the suppressor itself. The preset conditions are pre-defined protection target thresholds, such as requiring the bus overvoltage to not exceed 1.5 times the rated voltage, or the current of critical devices to not exceed their safe operating area. If the simulation results do not meet these conditions, the core structure parameters and secondary branch parameters are adjusted, for example, by increasing the core cross-sectional area to delay saturation, reducing the damping resistance to enhance energy absorption, or optimizing the triggering logic of the active branch. Afterwards, the process returns to step S30 to update the model and re-simulate, forming a closed-loop optimization process. This process is repeated until the system operating parameters meet the preset conditions. At this point, the output core and branch parameters represent the optimal configuration verified for this specific system.

[0099] It should be noted that the preset conditions include, but are not limited to: the peak value of the short-circuit current is not greater than the allowable peak value; when an arc short circuit occurs in the load, the energy injected by the system into the approximately short-circuited load is not greater than the allowable injected energy; the maximum magnetic flux density of the iron core does not exceed the saturation magnetic induction intensity; the voltage, current and temperature rise of the secondary winding do not exceed the corresponding limit values; the peak power of the energy-consuming resistor does not exceed the corresponding limit value; and the outer dimensions of the iron core meet the requirements of installation space and insulation distance.

[0100] Specifically, in the load short-circuit transient simulation, the following system operating parameters are calculated at the moment of load short-circuit triggering: Peak short-circuit current: .

[0101] Load-injected energy: .

[0102] If the following conditions are met: ; If the active iron core surge suppressor meets the design requirements in terms of short-circuit current peak and load surge energy injection, then it is considered that the surge suppressor meets the design requirements.

[0103] If the conditions are not met, adjust the parameters according to the type of constraint that is not met. When the peak short-circuit current is too high, increase the number of cascaded cores. N c Increase strip width W Alternatively, increase the energy dissipation capacity of the secondary side; when the energy injected by the load is too high, increase the energy dissipation resistor. R d Alternatively, optimize the core installation position; if the core saturates prematurely, increase the effective cross-sectional area of ​​the core or improve the reverse premagnetization; if the secondary branch current is too large, increase the number of turns in the secondary winding. N 2. Increase the energy-consuming resistor R d .

[0104] Specifically, the iteration in step S40 includes simulating the changes in equivalent time-varying magnetizing inductance and equivalent time-varying eddy current resistance using a discrete recursive method or a controlled voltage source method.

[0105] It should be noted that the discrete recursive method is as follows: based on the simulation sampling period and the excitation branch voltage of the previous sampling period, the saturation region thickness of the first layer of strip in the core is recursively updated; based on the updated saturation region thickness of the first layer of strip, the saturation region thickness of each layer of strip in the current sampling period is obtained; based on the saturation region thickness of each layer of strip in the current sampling period, the values ​​of the equivalent time-varying magnetizing inductance and the equivalent time-varying eddy current resistance in the current sampling period are obtained.

[0106] Please refer to Figure 4 , Figure 4 This is a detailed flowchart of the configuration iteration of the active iron core surge suppressor provided in the embodiments of this application. Let the simulation sampling period be... , No. Each sampling time is The initial saturation region thickness of the first strip layer is ,in Let the initial small quantity be greater than 0; let the first... The voltage across the excitation branch during each sampling period is The thickness of the first layer of strip in the saturated zone is then updated according to the following formula: .

[0107] in, The voltage recursion coefficient, determined by the core structural parameters and the change in magnetic flux density, is calculated as follows: .

[0108] in, This represents the change in equivalent magnetic flux density of the iron core during the transient process of a load short circuit; when the iron core flips from the reverse premagnetization state to the forward saturation state... Take as .

[0109] get Then, according to Calculate the saturation region thickness of each strip layer, and then combine the above methods to obtain the values ​​of the equivalent time-varying magnetization inductance and equivalent time-varying eddy current resistance for the current sampling period.

[0110] Then, in to Within the simulation interval, it is believed that and Remain unchanged, and will and The voltages are input into the excitation branch of the second simulation model respectively; after the circuit solver completes the calculation for this sampling period, it obtains the new excitation branch voltage. and current in the through conductor Then, the calculation is repeated in the next sampling period until the simulation of the entire transient process of load short circuit is completed.

[0111] In this embodiment, firstly, this application unifies the DC high-voltage power supply, transmission line, load short circuit, and active iron core surge suppressor into the same transient simulation model, which enables direct evaluation of short-circuit current peak, load injected energy, and transient stress on the secondary side of the iron core surge suppressor during the design phase.

[0112] Second, this application does not design the iron core solely based on empirical volt-second product or distributed capacitance energy storage, but rather determines the iron core parameters through load short-circuit transient joint simulation iteration, which improves the design accuracy of the number of iron cores, strip size, and installation dimensions.

[0113] Third, this application explicitly represents the excitation branch of the active iron core surge suppressor as a parallel branch of the equivalent time-varying magnetizing inductance and the equivalent time-varying eddy current resistance, and gives the parameter formula that varies with the thickness of the saturation region, which can more accurately simulate the nonlinear and time-varying characteristics of the iron core during the short-circuit surge process.

[0114] Fourth, this application incorporates the secondary winding energy dissipation branch, bias power supply protection capacitor, and inductor into the design variables, so that the iron core maintains a preset magnetization state during normal operation, and some energy is dissipated through the secondary active branch during short circuit, while the protection capacitor and inductor prevent damage to the bias power supply, thereby improving the iron core utilization rate and the operational reliability of the active iron core surge suppressor.

[0115] Fifth, this application can achieve simulation using a parallel branch of variable inductor and variable resistor, and is applicable to other circuit transient simulation environments such as Simulink and Simplier.

[0116] In one specific embodiment, the DC high-voltage power supply has a rated output voltage of 120 kV, a rated output current of 40 A, a transmission line length of 100 m, a distributed capacitance per unit length of 200 pF / m, a stray inductance per unit length of 55.6 nH / m, and an equivalent dominant frequency of 1 MHz for the short-circuit current. The design objective is that the active iron core surge suppressor absorbs a minimum energy of not less than 22 J and a peak short-circuit current of not more than 120 A.

[0117] At this point, the core strip is made of 1J51 soft magnetic alloy, the relative permeability of the core strip is 60000, the saturation magnetic induction intensity is 1.5 T, the residual magnetic induction intensity is 1.35 T, the strip thickness is 0.071 mm, the initial value of the inner radius of the core is 245 mm, the initial value of the outer radius is 445 mm, and the initial value of the number of winding layers is 2817 layers.

[0118] Based on the above parameters, the minimum energy absorbed by the iron core is first determined by the equivalent distributed capacitance energy storage of the system, and then the effective cross-sectional area and number of cascades of the iron core are determined by the volt-second constraint of the iron core. Then, the number of turns and bias current of the secondary winding are determined according to the normal operating current and pre-magnetization requirements. After that, the obtained parameters are substituted into the DC high voltage power supply load short-circuit transient simulation model, and the equivalent time-varying magnetizing inductance and equivalent time-varying eddy current resistance are calculated by using the discrete recursive method or the controlled voltage source method to obtain the peak short-circuit current, the load injected energy and the change in iron core magnetic flux density.

[0119] If the core saturates prematurely, increase the number of cascaded cores, increase the strip width, or improve the energy dissipation capacity of the secondary side; if the secondary winding current is too large, increase the number of turns of the secondary winding or adjust the energy dissipation resistor; if the device size is too large, reduce the number of cores or optimize the inner and outer diameters of the cores while meeting the short-circuit current and energy constraints.

[0120] The final design output includes: core material type, inner radius and outer radius of a single core, strip width and thickness, number of winding layers, number of cascaded cores, number of turns in the secondary winding, cross-sectional area of ​​the secondary winding conductor, bias power supply current, bias power supply voltage, resistance value of the energy dissipation resistor, energy capacity of the energy dissipation resistor, rated voltage and current of the controlled switching devices, short-circuit triggering sequence, reset control sequence, and simulation verification waveforms.

[0121] In addition, this application also proposes an embodiment of an active iron core surge suppressor configuration device. Please refer to... Figure 5 The active core surge suppressor configuration device described below and the active core surge suppressor configuration method described above can be referred to in correspondence.

[0122] In this embodiment, the active iron core surge suppressor configuration device includes: The first modeling and simulation module is used to establish a first simulation model of the DC high voltage power supply load short-circuit transient based on the system rated parameters of the DC high voltage power supply system and to perform simulation to obtain the system short-circuit parameters at the moment of load short-circuit triggering.

[0123] The parameter configuration module is used to select the initial core structure parameters of the active core surge suppressor module according to the system short-circuit parameters, and to determine the secondary branch parameters of the active core surge suppressor module according to the system rated parameters.

[0124] The second modeling and simulation module is used to connect the active core surge suppressor module to the first simulation model based on the initial core structure parameters and secondary side branch parameters, so as to generate the second simulation model and perform simulation.

[0125] The iterative optimization module is used to obtain the system operating parameters of the second simulation model at the moment of load short circuit triggering; and when the system operating parameters do not meet the preset constraints, it adjusts the initial core structure parameters and / or secondary side branch parameters, and triggers the second modeling and simulation module to regenerate the model and simulate until the system operating parameters meet the preset constraints. Then, it outputs the current core structure parameters and the current secondary side branch parameters to configure the active core surge suppressor.

[0126] It is understood that the detailed functional implementation of each of the above units / modules can be found in the description in the foregoing method embodiments, and will not be repeated here.

[0127] Compared with the prior art, the beneficial effects of the active core surge suppressor configuration device provided in this application are the same as the beneficial effects of the active core surge suppressor configuration method provided in the above embodiments, and will not be repeated here.

[0128] It should be understood that the above-described device is used to execute the methods in the above embodiments. The implementation principle and technical effect of the corresponding program modules in the device are similar to those described in the above methods. The working process of the device can be referred to the corresponding process in the above methods, and will not be repeated here.

[0129] Based on the methods in the above embodiments, please refer to Figure 6 This application provides an electronic device that may include a processor, a communications interface, a memory, and a communication bus. The processor, communications interface, and memory communicate with each other via the communication bus. The processor can invoke logical instructions stored in the memory to execute the methods described in the above embodiments.

[0130] Furthermore, the logical instructions in the aforementioned memory can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0131] Based on the methods in the above embodiments, this application provides a computer-readable storage medium storing a computer program that, when run on a processor, causes the processor to execute the methods in the above embodiments.

[0132] Based on the methods in the above embodiments, this application provides a computer program product that, when run on a processor, causes the processor to execute the methods in the above embodiments.

[0133] It is understood that the processor in the embodiments of this application can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. A general-purpose processor can be a microprocessor or any conventional processor.

[0134] The method steps in this application embodiment can be implemented in hardware or by a processor executing software instructions. The software instructions can consist of corresponding software modules, which can be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, portable hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can reside in an ASIC.

[0135] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0136] It is understood that the various numerical designations used in the embodiments of this application are merely for the convenience of description and are not intended to limit the scope of the embodiments of this application.

[0137] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for configuring an active iron core surge suppressor based on a transient simulation model, characterized in that, include: Step S10: Based on the rated parameters of the DC high voltage power supply system, establish a first simulation model of the DC high voltage power supply load short-circuit transient and perform simulation to obtain the system short-circuit parameters at the moment of load short-circuit triggering; the first simulation model includes a power supply module, a transmission line module and a load short-circuit module; Step S20: Select the core structure parameters of the active core surge suppressor module according to the system short-circuit parameters, and determine the secondary side branch parameters of the active core surge suppressor module according to the system rated parameters. Step S30: Based on the core structure parameters and secondary side branch parameters, add an active core surge suppressor module to the first simulation model to generate a second simulation model; Step S40: Simulate the second simulation model to obtain the system operating parameters at the moment of load short circuit triggering; and adjust the core structure parameters and secondary side branch parameters when the system operating parameters do not meet the preset conditions, until the system operating parameters meet the preset conditions and then output the current core structure parameters and current secondary side branch parameters to configure the active core surge suppressor.

2. The configuration method of the active iron core surge suppressor based on the transient simulation model as described in claim 1, characterized in that: The excitation branch of the active core surge suppressor module is represented by an equivalent time-varying magnetizing inductance and an equivalent time-varying eddy current resistor connected in parallel; the secondary branch of the active core surge suppressor module is represented by a circuit topology including a secondary winding, a bias power supply, and a power dissipation resistor.

3. The configuration method of the active iron core surge suppressor based on the transient simulation model as described in claim 1, characterized in that, In step S20, selecting the core structure parameters of the active core surge suppressor module based on the system short-circuit parameters includes: The peak short-circuit current, load injected energy, transmission line voltage fluctuation, and power supply-side transient electrical stress are extracted from the system's short-circuit parameters. Based on the short-circuit current peak value, load injected energy, transmission line voltage fluctuation and power supply side transient electrical stress, determine the short-circuit current peak value limit target, load injected energy limit target and core volt-second withstand capability; Based on the short-circuit current peak limit target, load injection energy limit target, and core volt-second withstand capability, the core structure parameters of the active core surge suppressor are determined.

4. The configuration method of the active iron core surge suppressor based on the transient simulation model as described in claim 1, characterized in that, In step S20, determining the secondary branch parameters of the active core surge suppressor module based on the system rated parameters includes: Extract the normal operating current from the system's rated parameters; The secondary branch parameters of the active core surge suppressor are determined based on the normal operating current, core pre-magnetization requirements, and load short-circuit transient energy consumption requirements. The secondary branch parameters include the number of turns in the secondary winding, conductor cross-sectional area, winding resistance, insulation class, bias power supply current, bias power supply voltage, energy consumption resistor, rated voltage and current of the controlled switching devices, and control timing.

5. The configuration method of the active iron core surge suppressor based on the transient simulation model as described in claim 2, characterized in that, Step S30 is as follows: The equivalent time-varying magnetizing inductance and equivalent time-varying eddy current resistance parameters are obtained based on the core structure parameters to construct the excitation branch, and the secondary side branch is constructed based on the secondary side branch parameters. The excitation branch and the secondary side branch are connected to the first simulation model to generate the second simulation model.

6. The configuration method of the active iron core surge suppressor based on the transient simulation model as described in claim 5, characterized in that, The equivalent time-varying magnetizing inductance and equivalent time-varying eddy current resistance parameters are obtained based on the core structure parameters, including: Based on the saturation wave theory, the saturation zone thickness of each layer of strip in the core of the active core surge suppressor is determined. Based on the saturation region thickness of each layer of the core strip and the core structural parameters, the equivalent time-varying magnetizing inductance and the equivalent time-varying eddy current resistance are obtained.

7. The configuration method of the active iron core surge suppressor based on the transient simulation model as described in claim 6, characterized in that, The iteration in step S40 includes simulating the changes in the equivalent time-varying magnetizing inductance and the equivalent time-varying eddy current resistance using a discrete recursive method or a controlled voltage source method; The discrete recursive method specifically involves recursively updating the saturation zone thickness of the first layer of strip in the core based on the simulation sampling period and the excitation branch voltage of the previous sampling period. Based on the updated saturation region thickness of the first strip layer, obtain the saturation region thickness of each strip layer within the current sampling period; Based on the saturation region thickness of each strip layer within the current sampling period, the values ​​of the equivalent time-varying magnetization inductance and equivalent time-varying eddy current resistance for the current sampling period are obtained.

8. An active iron-core surge suppressor configuration device, characterized in that, include: The first modeling and simulation module is used to establish the first simulation model of the DC high voltage power supply load short circuit transient based on the system rated parameters of the DC high voltage power supply system and to perform simulation to obtain the system short circuit parameters at the moment of load short circuit triggering. The parameter configuration module is used to select the initial core structure parameters of the active core surge suppressor module according to the system short-circuit parameters, and to determine the secondary side branch parameters of the active core surge suppressor module according to the system rated parameters. The second modeling and simulation module is used to connect an active core surge suppressor module to the first simulation model based on the initial core structure parameters and the secondary side branch parameters, so as to generate a second simulation model and perform simulation. The iterative optimization module is used to obtain the system operating parameters of the second simulation model at the moment of load short circuit triggering; and when the system operating parameters do not meet the preset constraints, adjust the initial core structure parameters and / or the secondary side branch parameters, and trigger the second modeling and simulation module to regenerate the model and simulate until the system operating parameters meet the preset constraints, and then output the current core structure parameters and the current secondary side branch parameters to configure the active core surge suppressor.

9. An electronic device, characterized in that, Includes memory and one or more processors; The memory is coupled to the one or more processors, and the memory is used to store computer program code, the computer program code including computer instructions; The one or more processors invoke the computer instructions to cause the electronic device to execute the active core surge suppressor configuration method based on a transient simulation model as described in any one of claims 1 to 7.

10. A computer-readable storage medium comprising instructions, characterized in that: When the instruction is executed on an electronic device, the electronic device performs the active core surge suppressor configuration method based on a transient simulation model as described in any one of claims 1 to 7.

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