321 results about "Equivalent model" patented technology

The invention discloses a power coupling-considered capacity ratio estimation method for a network-constructing / network-following multi-machine hybrid system, and the method comprises the steps: building a GFL-GFM hybrid system model, combining VSG power coupling small signal modeling and a dynamic relative gain matrix (DRGA), and quantifying the coupling strength of active / reactive power to output voltage; the frequency domain impedance characteristic of the GFM converter is simplified, and an ideal voltage source series equivalent reactance equivalent model is constructed; deriving an analytical relationship between a generalized short-circuit ratio (gSCR) and a capacity ratio based on the model, and generating a ratio formula in combination with engineering boundary sub-scenes to form a ratio range suitable for multiple scenes; for coupling time-varying characteristics, a closed-loop mechanism of'mixed mode-coupling sensing-correction calculation-execution feedback 'is constructed, and the ratio is dynamically adjusted. According to the method, coupling quantization and multi-machine coordination control are deeply fused, the problem that the external characteristic model precision and the multi-working-condition adaptability are difficult to consider under complex environment coupling is effectively solved, and the engineering applicability of the hybrid fan system is enhanced.

The invention discloses a cooperative scheduling method for a zero-carbon park complementary energy storage system, and the method comprises the steps: enabling an electric energy quality index to be explicitly incorporated into an optimization target through multi-source resource dynamic modeling and scene prediction, and building a strong coupling relation between a physical constraint and a scheduling decision; the hierarchical execution mechanism gives consideration to global optimization and local quick response, realizes undisturbed switching under abnormal working conditions, forms a prediction-optimization-execution-feedback closed-loop control system, and can accurately describe physical connection and electrical characteristics of a park power grid by establishing a power distribution network equivalent model and acquiring topological parameters, thereby realizing the optimal control of the park power grid. And basic network data is provided for subsequent optimization. By determining the controllable resource set and completing topological mapping, the position and the regulation and control range of each device in the power grid can be determined, and mistaken sending or conflict of instructions can be avoided. An apparent power upper limit constraint and SOC dynamic model is established, overload operation of equipment can be avoided, the energy storage charging and discharging capacity can be accurately represented, and the performability of a scheduling scheme is ensured.

The invention discloses a wind power plant network following / constructing type fan proportion optimization configuration method and device, a medium and a product, and belongs to the technical field of new energy power system stability control, and the method comprises the steps: collecting the operation data of a wind power plant and a power grid, and carrying out the standardization preprocessing; constructing a typical operation scene set based on the preprocessed data; establishing an equivalent model of a following network type fan and a construction network type fan and a coupling model with a power grid; constructing a frequency, voltage and transient stability index system based on the coupling model; designing constraint conditions containing stability indexes; constructing a multi-objective optimization function with stability priority; solving by adopting a global optimization algorithm to obtain an optimal fan proportion solution set; and performing simulation verification and scheme screening on the optimal solution set, and determining a final configuration proportion. On the premise of ensuring the stability of the power grid, the proportion of different types of fans in the wind power plant is scientifically configured, and the safe and stable operation capability of a high-proportion new energy power system is effectively improved.

The invention relates to a rapid estimation method and device for MMC loss in an electromagnetic transient model, and a medium. The method comprises the following steps: S1, constructing a Thevenin equivalent model of an MMC; s2, on the basis of an MMC Thevenin equivalent model, discretizing a sub-module capacitor based on a numerical integration method to establish an on-state loss model of the sub-module; s3, correcting to obtain the turn-on loss and turn-off loss of the IGBT and the reverse recovery loss of the diode; s4, in one simulation step, on-state loss is obtained through calculation based on an on-state loss model, the total switching frequency is obtained through calculation according to port data of the Thevenin equivalent model, and switching loss is obtained through combination of on-state loss and off-state loss of an IGBT and reverse recovery loss and switching frequency of a diode; and S5, taking the sum of the on-state loss and the switching loss as total loss. Compared with the prior art, the method has the advantages that real-time updating in the simulation step can be realized, the calculation complexity is controllable, and the overhead is remarkably reduced while the engineering precision is ensured.

The invention discloses an interface method for a VSC direct current system mixed granularity model and an alternating current system electromechanical transient model. The method comprises the steps that a mixed granularity simulation framework is constructed, wherein an electromechanical transient phasor model is adopted on the alternating current side, and a simplified electromagnetic transient instantaneous value model considering electromagnetic characteristics is adopted on the direct current side; the VSC converter adopts a unified equivalent model, and various types of converters are adapted through parameter configuration; a low-voltage side bus of the converter transformer is arranged at the interface position of the simulation framework and the alternating current system; simulation and interaction rules are configured, wherein the simulation step length of each direct-current power grid is independently set; the alternating current system provides port voltage and alternating current control information for the simulation framework, the simulation framework is equivalent to the alternating current system as a power source, and power exchange is realized through the converter station; in one time step calculation of the electromechanical transient state, the simulation framework changes along with the alternating current side information, a historical simulation state is taken back, and direct current side simulation in the alternating current time step is carried out again until the power interaction deviation converges.

The invention discloses a load storage charging and discharging integrated power grid stability simulation analysis method and system, and belongs to the technical field of simulation analysis, and the method comprises the steps: obtaining power grid operation data and resource state data; constructing a load storage charging and discharging resource unified equivalent model containing self-adaptive virtual inertia and self-adaptive transient damping; power grid transient stability simulation is executed, and transient response data are generated; processing the response data, and calculating to obtain a multi-dimensional transient stability comprehensive index fusing the oscillation damping ratio and the voltage deviation integral; and iteratively adjusting the virtual inertia and the transient damping parameter according to the comprehensive index until an optimization condition is met, and generating an optimization control strategy. According to the method, the load storage charging and discharging heterogeneous resources are aggregated into the unified equivalent model, parameter optimization is guided through the transient stability comprehensive index, the grid-connected stability of the high-permeability power electronic equipment can be accurately evaluated and optimized, and the transient reliability and operation safety of a power grid when the power grid is subjected to fault disturbance are improved.

The invention relates to a hybrid optimization method for dynamic response of a valve element of a CDC electromagnetic valve, and belongs to the technical field of automobile suspensions. The method comprises the following steps: (1) establishing a three-dimensional equivalent model of the CDC electromagnetic valve; (2) building a CDC electromagnetic valve system throttling principle model, determining an oil path, building the valve system throttling principle model by using fluid mechanics, and determining a pressure flow relation of each valve system; (3) building a stress model of the pilot valve and the main valve core; (4) selecting target optimization structure parameters; (5) constructing hypercube mapping and generating an initial population; (6) carrying out dual-core coevolution to carry out main circulation; (7) judging whether a termination condition is met or not; and (8) outputting a result. According to the method, through a dual-core collaborative architecture and an adaptive search mechanism, the inherent defect that the exploration breadth and the development depth are difficult to consider in a traditional method is effectively overcome, and the optimal solution is quickly and accurately searched in a global range.

The application provides a multi-objective robust optimization method, system, storage medium and electronic equipment for production task planning of a multi-agent collaborative platform, and relates to the technical field of production task planning of a multi-agent collaborative platform. First, according to the production task planning resources of the multi-agent collaborative platform and a single-batch overseas order, a production task planning model with a manufacturing enterprise agent as the core is constructed under the premise of determining the sea transportation time. Then, an infinity norm ball uncertain set is designed for the sea transportation time of a large ship, a robust quadratic multi-objective model for cross-regional multi-agent production task planning is constructed, and the total delivery time deviation and total delivery cost multi-objective of the single-batch overseas order are optimized. The model considers the sea transportation plan prepared in advance by a shipping company agent and the long and uncertain sea transportation time. In addition, the model is converted into an equivalent model, a two-stage hybrid heuristic algorithm is designed for solving, and a reasonable and feasible production task planning suggestion is given for the single-batch overseas order.

The invention discloses a decoupling cell-hybrid equivalent model and a permanent magnet flat wire motor multi-physical field cooperation rapid optimization method, a rotor and a stator are modeled separately, and complete separation of a motor topological structure and an analysis grid is realized at the rotor part through decoupling cells, so that the motor topological structure can be completely separated from the analysis grid when facing various different rotor topological structures. And a new grid structure does not need to be repeatedly constructed, so that the modeling efficiency, the model universality and the modeling flexibility of a complex structure are greatly improved. And the stator adopts hybrid equivalent modeling, so that the solving complexity is remarkably reduced while the high calculation precision is kept. The rotor side adopts boundary encryption subdivision to ensure stress precision, and the stator side adopts a parameterized equivalent magnetocaloric network model to reduce analysis time consumption, and unification of high precision and high efficiency is realized. By means of an NSGA-II algorithm, a bidirectional coupling calculation framework among an electromagnetic field, a temperature field and a stress field is constructed, efficient coupling iteration among physical quantities of the three fields is achieved through coupling calculation, and coupling prediction precision and design reliability are effectively improved.

The invention discloses a wind power plant equivalent modeling method and device, electronic equipment and a storage medium, and the method comprises the steps: dividing wind turbine generators in a wind power plant into a plurality of unit clusters, and generating an equivalent impedance parameter of each cluster through a pre-trained parameter generation network; compared with a traditional single-machine multiplication equivalent model, the multi-machine multiplication equivalent model has the advantages that the dynamic response of the equivalent model in a resonance frequency band can be kept consistent with that of an actual model; according to the method, the equivalent impedance parameter is dynamically estimated according to the average output of each cluster by adopting the pre-trained parameter generation network, and the nonlinear mapping relation between the cluster output and the equivalent impedance is established, so that the dynamic response of an equivalent model in a resonance frequency band is highly consistent with that of a detailed model, and the dependence on manual calculation or complex equivalent derivation is avoided; the automation degree and the cross-project generalization ability of the modeling process are improved, and the method is particularly suitable for the rapid modeling requirements of large-scale and multi-type wind power plants.

This invention provides a method for constructing a stiffness equivalent model of a porous laminated structural member, including: S1, obtaining the unit cell characteristic size parameters of the pores on the laminates; S2, constructing a unit cell solid model of the laminates; S3, constructing a unit cell solid finite element analysis model of the laminates; S4, preprocessing the unit cell solid finite element analysis model; S5, calculating the stiffness equivalent modulus of the laminates at different temperatures; S6, repeating steps S1 to S5 to calculate the stiffness equivalent modulus of all laminates in the porous laminated structural member in each direction at different temperatures; S7, performing integrated boundary processing on the stiffness equivalent modulus calculated in step S6 to construct the stiffness equivalent model of the porous laminated structural member. This method can simplify porous laminated structural members into non-porous laminated structural models, effectively reflecting the mechanical properties of porous laminated structural members, while significantly improving computational efficiency and accuracy, and has broad engineering application prospects.

The application relates to the technical field of power electronics, and discloses a press-contact type IGBT device packaging structure optimization method and system. The method comprises the following steps: constructing an equivalent model of a press-contact type IGBT device; constructing a differential algebraic equation for uniformly describing the equivalent model of the press-contact type IGBT device and circuit port variables; converting the differential algebraic equation into a nonlinear algebraic equation group through time domain discretization, and constructing an iteration matrix with a global state vector as a derivation object according to a solving mode of the nonlinear algebraic equation group; performing low-dimensional subspace projection on the iteration matrix based on a Krylov subspace, and combining residual minimization to solve a linear subproblem of the iteration matrix, so that current uniformity characteristic results of the press-contact type IGBT device are obtained; and the packaging structure of the press-contact type IGBT device is optimized based on current density distribution reflected by the current uniformity characteristic results. The application can improve the current uniformity and operation reliability of the system.

The invention discloses a high-temperature superconducting cable equivalent analysis method, a high-temperature superconducting cable equivalent analysis system, a medium and electronic equipment, and relates to the technical field of power devices and superconducting power transmission. Constructing a first equivalent circuit model based on the structural characteristic parameter set, and performing cross generality screening on the material parameters by adopting a multi-factor influence separation method to obtain a first equivalent parameter set; constructing a first coupling model based on the first equivalent parameter set, and applying disturbance signals of different frequencies to perform fault simulation to obtain a working condition equivalent model; extracting transient response data based on the working condition equivalent model, and identifying transient quenching response characteristics of the high-temperature superconducting cable based on the transient response data; according to the method, a multi-objective optimization function is constructed based on transient quench response characteristics, control parameters are optimized by adopting an NSGA-III algorithm, an optimal control strategy is obtained, and the problems of high quench expansion risk and difficulty in timely regulation and control of the high-temperature superconducting cable under a transient fault are solved.

The application provides a method and system for optimizing configuration of a hybrid grid-connected system of offshore wind turbines, which comprises: constructing an equivalent model of a hybrid grid-connected system of grid-following offshore wind turbines and grid-forming offshore wind turbines; introducing a ShockHash algorithm to perform minimum perfect hash mapping on system parameters, and establishing a stability margin evaluation index; constructing an optimization configuration model containing capacity constraints and stability margin constraints; using a parallel batch dynamic maximum matching algorithm to solve the system optimization under different grid strengths; and setting a subset feedback arc to perform closed-loop control on system stability. The application solves the problems of inaccurate equivalent modeling of a hybrid grid-connected system of offshore wind turbines, difficulty in quantifying stability margin, and low efficiency of configuration methods, and realizes the optimization configuration and adaptive adjustment of a hybrid grid-connected system of offshore wind turbines under different grid conditions, thereby improving the stability and economy of the system.

The invention relates to an equivalent modeling method and device for a lithium battery energy storage power station, computer equipment, a readable storage medium and a program product, and relates to the technical field of simulation modeling. The accuracy of the equivalent model obtained through simulation can be improved. The method comprises the following steps: determining a plurality of lithium battery energy storage power stations needing equivalence in a power system, constructing single body models of lithium batteries, and carrying out equivalence modeling by adopting an arrangement mode of connecting in series and then connecting in parallel on the basis of the single body models to obtain an equivalence model of a lithium battery pack; performing parameter aggregation on the LCL filter according to the equivalent circuit diagram of the LCL filter in the lithium battery energy storage power station to obtain equivalent reactance values respectively corresponding to two inductors and one capacitor in the LCL filter; simulating a rotor motion equation of the virtual synchronous generator by adopting a VSG control strategy, and performing controller parameter aggregation based on the rotor motion equation to obtain a parameter aggregation result; and performing equivalent modeling on the plurality of lithium battery energy storage power stations based on the equivalent model, the equivalent reactance value and the parameter aggregation result.

A kind of wind farm dynamic equivalent model construction method based on terrain distribution influence belongs to power system optimization operation technical field, the present wind power generation field dynamic equivalent model is constructed to solve the problem that actual power and the difference in operating state caused by complex terrain distribution are not considered, error is larger in the case of complex wind environment of wind farm.It includes: selecting wind turbine of same model parameter in wind power generation field to form wind turbine generator unit, obtaining power variation and variation rate of each wind turbine in wind turbine generator unit;Obtain the relative sensitivity of wind condition change influence of wind turbine, and the relative sensitivity of wind condition change influence is used as representation index to obtain the relationship between transient potential derivative and relative sensitivity;Obtain the equivalent parameter of equivalent unit in wind condition change dynamic process, and construct wind farm dynamic equivalent model according to equivalent parameter.The present application is used for the construction of wind turbine group equivalent model of same parameter.

The invention discloses a DC fault current analysis and calculation method suitable for multi-type MMC converters, and the method comprises the steps: determining the topology type of an MMC converter related to a fault line, and collecting core parameters; constructing an RLC series unified equivalent circuit model of the MMC, and correcting the RLC series unified equivalent circuit model based on the topology type to obtain an equivalent circuit correction model; and determining a DC fault current based on the equivalent circuit correction model. According to the method, a technical architecture of'unified modeling + differential correction 'is constructed, multiple types of MMC converters are abstracted into an RLC basic equivalent model, local parameter correction is carried out only for fault characteristic differences of different topologies, and the tedious process of repeated modeling is effectively avoided; meanwhile, converter active current limiting strategies such as locking and negative input control are considered in the modeling process of fault current analytical calculation, the model architecture has good expansibility, various control strategies can be flexibly fused, and deep fusion of the electromagnetic transient process and the control process is achieved.

The application discloses a kind of wind turbine group low voltage ride through model construction method and device, comprising: obtaining the operating variable dataset of wind turbine group;According to the operating variable dataset, the initial wind turbine group low voltage ride through model constructed is trained, to obtain wind turbine group low voltage ride through model.The application does not need to construct wind turbine group equivalent model and other mechanism model through the physical principle of wind turbine group, avoids the state of each wind turbine in wind turbine group is different to need to model each wind turbine respectively, and directly realizes the construction of wind turbine group low voltage ride through model through the operating data of wind turbine group, and then does not need to determine the parameter information of each wind turbine in wind turbine group, so that the application has high accuracy and high reliability.

The invention discloses a photovoltaic equivalent modeling method considering inverter parameters and characteristics of a power distribution network, and relates to the field of novel power systems. According to the method, firstly, photovoltaic inverter parameters and a photovoltaic access power distribution network structure are comprehensively considered, a set of comprehensive photovoltaic grouping indexes considering inverter parameter sensitivity and power distribution network characteristics are constructed, and the influence weight of each index on photovoltaic output characteristics is evaluated by adopting AHP in combination with a sensitivity analysis result before grouping; and then grouping the distributed photovoltaic in the system by adopting a Kmeans algorithm in combination with each index weight, thereby constructing a multi-machine equivalent model of the distributed photovoltaic. According to the method, high-precision multi-machine equivalent modeling is realized by screening key parameters, constructing comprehensive grouping indexes and introducing index weights.

The invention discloses a finite element simulation method for plasma noise reduction based on an equivalent sound source model, and belongs to the field of plasma noise reduction simulation. Comprising the following steps: S1, determining plasma model parameters; s2, establishing a pressure acoustic control equation; sound pressure components under the independent action of a sound source item and a heat source item corresponding to the plasma are solved based on the control equation, and the total sound pressure is obtained through linear superposition; s3, constructing a plasma sound source equivalent model; and S4, inputting a sound source item and a heat source item obtained by the plasma sound source equivalent model into a pressure acoustic control equation, and solving through a finite element method to obtain a noise reduction process under the action of the plasma noise reduction equipment. According to the efficient plasma noise reduction simulation method provided by the invention, a complex plasma physical process is simplified into an equivalent source item in an acoustic equation by establishing a plasma equivalent sound source model, so that the problem of direct solving of expensive multi-field coupling is avoided, and the calculation efficiency is improved by a plurality of orders of magnitude.

This application relates to the field of power system stability control technology, specifically to a method and system for online stability assessment and control of hybrid systems based on an improved short-circuit ratio. The method includes: constructing an equivalent model of the integrated / grid-connected hybrid system; calculating the improved short-circuit ratio of multiple renewable energy power plants based on the voltage source characteristics of grid-connected equipment to quantify the grid strength at each grid connection point; constructing a characteristic polynomial based on the impedance matrix; and using the circular loop theorem to quickly search for the dominant eigenvalues, avoiding high-dimensional calculations, to obtain the critical short-circuit ratio. If the real-time short-circuit ratio is lower than the critical value, an instability risk is determined, triggering a control strategy that increases the capacity of grid-connected equipment or adjusts the grid connection point. This method, through the combination of the improved short-circuit ratio and the circular loop theorem, achieves online quantitative assessment and closed-loop control of the small-disturbance stability of integrated / grid-connected hybrid systems.

The application discloses a transformer short-circuit winding amplitude force failure test model equivalent method and device. The application determines a winding prototype and a winding prototype specification according to a transformer to be tested, establishes a winding equivalent model in combination with the winding prototype and the winding prototype specification, carries out an amplitude force failure test on the winding equivalent model based on a pre-defined amplitude force failure mode, obtains a first amplitude force failure characteristic value, carries out an amplitude force failure test on the transformer to be tested based on the amplitude force failure mode, obtains a second amplitude force failure characteristic value, and judges whether the winding equivalent model is used as a winding amplitude force failure test model according to the first amplitude force failure characteristic value and the second amplitude force failure characteristic value. The winding amplitude force failure test model can be established for the transformer to be tested, which is beneficial to accurately reflecting the winding amplitude force failure condition of the transformer to be tested and guaranteeing the equivalence and correctness of the winding amplitude force stability research.

The invention discloses an automatic verification method and system for consistency of an electromechanical transient model of a photovoltaic station. Each verification test item of the automatic verification method for consistency of the electromechanical transient model of the photovoltaic station comprises the following steps: S1, extracting simulation data of a detailed model of the photovoltaic station and simulation data of an equivalent model of the photovoltaic station; the simulation data are a fundamental wave positive sequence voltage, a fundamental wave positive sequence current, a reactive current component, active power and reactive power, and entering S2; s2, dividing the simulation data sequence of the detailed model of the photovoltaic station and the simulation data sequence of the equivalent model of the photovoltaic station into a pre-disturbance time period A, a disturbance period time period B and a post-disturbance time period C, and entering S3; s3, calculating the deviation between the simulation data of the detailed model of the photovoltaic station and the simulation data of the equivalent model of the photovoltaic station, and then comparing the deviation with an allowable maximum deviation threshold to obtain a verification result; and S4, presenting the verification result obtained in the step S3. The working efficiency can be improved.

This invention discloses a method and system for constructing a vehicle body distortion model, a train model, and a system thereof. The method includes obtaining similarity factors for various design variables; establishing a full-size equivalent vehicle body model based on the stiffness equivalence principle; constructing a vehicle body distortion model based on the similarity factors of the various design variables and the required thickness or a preset thickness distortion coefficient; calculating the distortion coefficient corresponding to the dynamic response-time on the vehicle body distortion model based on the distortion relationship between the thickness distortion coefficient and the dynamic response-time; and correcting the dynamic response-time curve of the vehicle body distortion model based on the distortion coefficient corresponding to the dynamic response-time. This invention aims to correct the dynamic response of a vehicle body distortion model by determining the distortion coefficients of other dynamic responses through the relationship between the thickness distortion coefficient and the distortion coefficients of other dynamic responses, thereby correcting the dynamic response of the vehicle body distortion model and reducing the impact of thickness distortion on the model's dynamic response.

The invention discloses a vacuum circuit breaker conductive loop temperature rise simulation optimization method, which comprises the following steps of: obtaining structure parameters of a circuit breaker, identifying a temperature rise sensitive area and constructing a simplified geometric model and a grid model; establishing a multilayer coating equivalent model and a contact resistance analytical model based on the coating parameters and the surface roughness, and determining initial contact parameters; constructing an electro-thermal coupling multi-physical field simulation model, executing bidirectional coupling iteration solution of a current field and a temperature field, and dynamically correcting the resistance value of the contact resistance analysis model according to the current temperature field distribution in the iteration process until a convergence condition is met; and outputting a steady-state temperature field and determining an optimal process scheme. According to the method, the temperature-load coupled contact resistance dynamic evolution model is established, so that the problem of prediction deviation caused by neglecting of contact surface microstructure dynamic change in traditional simulation is solved, and the temperature rise calculation precision is improved.

The invention belongs to the technical field of equivalent modeling, and discloses a hybrid wind power plant equivalent method and device based on oscillation energy decomposition, and the method comprises the steps: obtaining the operation measurement data of a hybrid wind power plant, carrying out the calculation or frequency scanning of each fan grid-connected branch, and obtaining a broadband equivalent impedance characteristic; constructing a multi-machine oscillation energy equivalent unit comprising a plurality of grid-connected branches according to the broadband equivalent impedance characteristic and the actual grid-connected topology of the wind power plant; establishing an energy function and a dynamic equation according to the multi-machine oscillation energy equivalent unit; performing modal decomposition and branch decomposition on the system oscillation energy, and calculating the oscillation energy contribution degree and the dissipated energy participation degree of each fan grid-connected branch in a dominant oscillation mode to obtain an energy characteristic quantity; performing fan grouping to obtain a fan grouping result of the hybrid wind power plant; and performing differential equivalence and parameter aggregation according to a fan grouping result to obtain a small disturbance equivalence model. The calculation model scale and the calculation complexity of the hybrid wind power plant can be reduced.

This invention discloses a design method for generating circuit schematics from passive S-parameter matrices, comprising: determining a single-ended S-parameter matrix based on the function of the target circuit; converting the single-ended S-parameter matrix into a corresponding Y-parameter matrix; constructing an initial equivalent circuit composed of capacitors and inductors based on the imaginary part characteristics of the elements in the Y-parameter matrix; optimizing the initial equivalent circuit using a transformer equivalent model, merging multiple inductors in the circuit into a transformer, and obtaining a circuit schematic with the transformer as the main component. This invention can automatically transform functional objectives into manufacturable passive component topologies. By introducing a transformer equivalent model, it achieves the effective merging of multiple inductors in the circuit, thereby achieving significant chip area optimization and cost reduction.

The embodiment of the invention provides a port differential mode voltage simulation method of a train. The method comprises the steps that an overvoltage simulation model corresponding to a train, the position of a speed sensor of the train, a shell simulation model of the speed sensor and a signal cable model of the speed sensor are obtained; determining a first equivalent model corresponding to a signal generating circuit of the speed sensor and a second equivalent model corresponding to a signal receiving circuit; based on the overvoltage simulation model, the position of the speed sensor, the shell simulation model of the speed sensor, the signal cable model, the first equivalent model and the second equivalent model, determining a port differential mode voltage model; and according to the port differential mode voltage model, determining the port differential mode voltage corresponding to the speed sensor under the transient condition of the train. The port differential mode voltage model constructed through the method is closer to a real physical scene, the deviation between port differential mode voltage simulation and reality is reduced, and a high-precision data basis is provided for subsequent analysis of the influence of train overvoltage on a speed sensor.

The invention provides an equivalent model building method and device of a new energy cluster, a medium and equipment, and relates to the field of new energy power system modeling and simulation, and the method comprises the steps: obtaining basic parameters of the new energy cluster, and carrying out the preprocessing of the basic parameters; constructing a transformer T-shaped equivalent circuit based on the preprocessed basic parameters, and calculating current collection line equivalent parameters based on the preprocessed basic parameters; associating a transformer T-shaped equivalent circuit and a current collection line equivalent parameter with an internal equipment model of the new energy station, accessing a receiving end power grid parameter, and building an initial equivalent model of a new energy cluster; and verifying the initial equivalent model through load flow calculation and transient fault scanning, and determining the initial equivalent model passing the verification as a target equivalent model of the new energy cluster. According to the method, the problems of low equivalent calculation precision, poor loss consistency and insufficient transient response matching degree in existing new energy cluster modeling can be solved.

The application discloses a simulation analysis method and device based on an RTDS large power grid equivalent model, and the method comprises the following steps: determining a power transmission section of a network frame, and obtaining an in-section boundary station list and an out-section boundary station list of the power transmission section; obtaining next-level stations connected by lines of each station in the in-section boundary station list, and determining a difference station list according to a relationship between the next-level stations and the out-section boundary station list and a to-be-built station list; obtaining next-level stations connected by transformers of each station in the in-section boundary station list, and determining the difference station list according to a voltage grade size relationship between the next-level stations and a to-be-modeled station, and a relationship between the next-level stations and the out-section boundary station list and the to-be-built station list; taking stations in the difference station list as the to-be-modeled stations, and performing power grid simulation modeling. Thus, in the case of a high proportion of new energy penetration at the present stage, the modeling efficiency and the simulation analysis accuracy are greatly improved.