64results about How to "Enable accurate simulation" patented technology

The invention discloses a flight stimulator system with persistent overload simulation capability. The flight stimulator system comprises a flight stimulator and an overload component model, wherein the overload component model is stored in a PC (Personal Computer); the flight stimulator comprises a nacelle, a rolling frame, a spiral arm, a weight balancing block, a base assembly, a first drive assembly, a second drive assembly, a third drive assembly and a fourth drive assembly, wherein the spiral arm, the nacelle and the rolling frame form a moving manned centrifugal platform; the moving manned centrifugal platform is driven by a motor in the base assembly and is also driven by the first drive assembly, the second drive assembly, the third drive assembly and the fourth drive assembly to realize persistent and non-instantaneous overload. A control method of the flight stimulator system comprises the following steps of: operating the flight parameters output by each device in the cockpit by a trainee; then, processing the flight parameters through the overload component model to as to obtain control parameters required by three-axial overload; and finally, accurately simulating three-axial persistent overload on the trainee by controlling the angular velocity of the spiral arm and the roll angle and the pitch angle of the nacelle.

The invention discloses an online visual free face surgery method and system for simulating effects of a plastic surgery. The method includes the following steps: acquiring face data of a user; generating an original face 3D simulation model of the user; returning face 3D model parameters; visualizing a face 3D model; the user carrying out free face surgery online; generating a plastic surgery effect simulation evaluation report. The system for realizing the method includes a client terminal and a server. The client terminal includes a photo photographing apparatus and an online face surgery device. The server includes a server. According to the invention, the method and the system can simulate the effects of a plastic surgery in a precise manner and is visual; the user can adjust ideal effect of the plastic surge online and can communicate with a doctor easily; the 3D face model is generated and feasible adjustment can be performed, which act as reference for the doctor in the implementation of the plastic surgery; the method and the system can be a contract content in the plastic surgery contract, protect the rights and interests of both parties, and avoid ordeal and risks to the user by repetitive surgeries.

The invention provides an excitation inrush current simulation method and device for an ultra-high voltage transformer under a condition of no-load closing. The excitation inrush current simulation method comprises the following steps: on the basis of the transitional area between the linear area and the non-linear area of the non-hysteresis curve, non-hysteresis magnetization intensity indicated by Langvin function is corrected; the corrected non-hysteresis magnetization intensity is utilized to establish a J-A magnetic hysteresis model; the parameters of the J-A magnetic hysteresis model are recognized; an analysis is conducted on the ultra-high voltage transformer and the differential magnetic susceptibility equation is determined; through the J-A magnetic hysteresis model and the differential magnetic susceptibility equation, the excitation inrush current of the ultra-high voltage transformer under the empty charging condition is determined. The excitation inrush current simulation method and device for the ultra-high voltage transformer under the condition of non-load losing correct the non-hysteresis magnetization intensity, enable the transitional area between the linear area and saturation area of the non-hysteresis curve to be closer to a true value and accurately simulate the magnetization characteristics of the transformer; moreover, the special construction of the ultra-high voltage transformer is considered and the excitation inrush current of the ultra-high voltage transformer under the condition of empty charging is simulated. Errors in the simulation are reduced.

The invention relates to a testing device for simulating the equipment corrosion of a continuous distillation industrial device. The testing device comprises a continuous distillation system, a pressure control system and a corrosion sample system, wherein the top interface of a multi-mouth flask is connected with the bottom of a main reactor; the top interface of the main reactor is connected with the bottom of a main condenser; the top of the main condenser is connected with a non-condensable gas receiving tank, a cold trap, a gas buffering tank and an exhaust system through connecting pipes respectively, and is connected to a vacuum pump through the cold trap; and the corrosion sample system comprises a sample hanging device for placing samples into a steam phase and a liquid phase. A skillful reflow design is adopted in the invention, so that a condensed low-boiling-point liquid does not flow through the high-temperature main reactor, so that re-vaporization before reflowing to the bottom of the multi-mouth flask is avoided. Under the action of a reflow bypass, condensed low-boiling-point components and high-boiling-point components left at the bottom of the multi-mouth flask are fully mixed forcedly, and the distillation process is started once again, so that accurate simulation of continuous distillation is realized.

The invention discloses a flat board type changeable simulation road face testing device including four road face simulation mechanism in contact with four wheels. The road face simulation mechanism includes a drive chain wheel and a driven chain wheel; chain links connected in a head-to-tail manner so as to form a loop chain engaged with the drive chain wheel and the driven chain wheel; a T-shaped channel steel board connected with the chain links fixedly and provided with a through T-shaped groove; a T-shaped block fitting with the T-shaped groove so as to enable the T-shaped block to embed into the T-shaped groove in a dismountable manner; and bosses arranged at the top end of the T-shaped block and in contact with wheels so as to realize road face excitation to an automobile, wherein the chain links between the drive chain wheel and the driven chain wheel are kept horizontal. The device provided by the invention is simple in structure and reasonable in design. Different road faces can be simulated through changing the shapes and distribution of the bosses.

The invention provides a transient temperature prediction method for an aviation permanent-magnet synchronous motor. According to the method, a two-dimensional electromagnetic field is designed for the motor and corresponding electromagnetic parameters are obtained according to the geometric size, material parameters, work system and load characteristic of the motor, a Matlab / Simulink electric driving system is used for simulation analysis, a three-phase current and motor rotating speed curve of the motor is obtained, high-precision temperature distribution is obtained by loss calculation based on curve fitting and a current / voltage source method, 3D motor model design and finite element model grid generation, cooling / radiating condition and liquid-solid coupling analysis, and transient temperature prediction for different components of the motor, and optimized design of the motor is facilitated to largest extent.

Provided is a Matlab / Simulink based power cable partial discharge signal propagation simulation method. The method comprises the following steps: 1) establishing a power cable distributed parameter model suitable for research on high-frequency partial discharge signal propagation properties; 2) by analysis on power cable partial discharge signal properties, establishing a simulation partial discharge signal; 3) establishing a simulation model of partial discharge wave propagation properties in a high-voltage power cable; and 4) timely outputting a simulation result of the simulation model. The method has the beneficial effects of realizing accurate stimulation of the partial discharge signal propagation properties in the power cable; and having excellent versatility, and timely outputting the simulation result of the simulation model, thereby effectively improving positioning precision of test on a partial discharge reflected wave, and providing a certain foundation for further research on detection of power cable partial discharge.

The invention discloses a method for imitating luminous environment. The method comprises the following steps: respectively confirming the light intensity of the light which influences the growth of crops in the spectrum of the actual luminous environment of the crops, and according to the corresponding relationship between the output power of a lamp and the light intensity, adjusting the output power of the lamp which can emit the light influencing the growth of crops. According to the method for imitating luminous environment provided by the invention, the lamp which can emit the light influencing the growth of crops is used as a light source, the light intensity of the light which influences the growth of crops is confirmed according to the spectrum of the actual luminous environment of the crops, and the output power of the lamp is adjusted based on the light intensity, thereby ensuring that the intensity of the light emitted by the lamp is accordant with the intensity of the light in the actual luminous environment and realizing the accurate imitation for the luminous environment. The invention also discloses a system for imitating luminous environment.

The invention relates to a data processing system for constructing a digital value fusion device based on a super computer, which comprises a cloud computing platform and the super computer, the cloud computing platform is in communication connection with the super computer, and the super computer comprises an artificial intelligence model library, a processor and a memory in which a computer program is stored. A pre-trained auto-encoder model is stored in the artificial intelligence model library. According to the system, the digital value fusion device can be quickly and accurately constructed, and full-period simulation of equipment is realized.

The invention discloses a three-dimensional physical simulation experiment method of small-sized self-weight frame-type loading. The method includes the following steps that firstly, front and rear side chair rails are installed on the front side and the rear side of a main frame device to form a similar material filling space according to a geological object to be simulated; secondly, a geometric analogue is filled into the similar material filling space with the height after the front and rear side chair rails are installed as the filling height for the first time, geometric analogue filling is carried out for the second time, the third time and the like according to the mode, a model is subject to air drying, and the front and rear side chair rails are disassembled; thirdly, a self-weight frame-type loading region is adjusted, so that a loading cross beam, a friction rubber plate and the geometric analogues make contact with one another well, a self-weight frame-type loading device freely slides up and down, and the loading height is equal to or smaller than the height of the front and rear side chair rails; fourthly, the model is subject to construction and excavation, and data collecting and recording are carried out through a computer system to complete an experiment. The method has the advantages that steps are reasonable and easy to execute. Due to the adoption of the method, underground engineering environments are made to precisely reappear, and data loading accuracy and experiment safety are improved.

The invention provides a method for realizing digital-analog hybrid simulation of a power system of a thermal power plant. The method comprises the following steps: (1) a digital model power generator in a power system simulation platform sends a simulation amount to the power system of the thermal power plant; and (2) the power system of the thermal power plant sends mechanical power of a steam turbine to the digital model power generator in the power system simulation platform so as to realize real-time closed-loop digital-analog hybrid simulation. According to the method, the modeling is performed by applying a two-phase flow process, systems such as a boiler system, a steam turbine system, an electric system, a control and protection system and the like are truly simulated, and the gas-liquid two-phase process of the thermal power plant is accurately simulated, so that the capability and precision of long-term modeling in a power system of a thermal power plant in an existing digital-analog hybrid simulation technology are improved and the problem in real-time simulation of access of large-scale power grids to the power system of the thermal power plant is solved.

The invention discloses a metal screw pump vertical type simulation experiment method. The metal screw pump vertical type simulation experiment method comprises the steps that a driving system drives a pump system to work, sand containing liquid in a stirring system is sucked into a pump body by the pump system through a pumping pipeline, meanwhile, a measuring system on the pumping pipeline completes the measuring work, and then the sand containing liquid is pumped back into the stirring system by the pump system through a pumping out pipeline. The driving system and the pump system are arranged vertically, so that the fit clearance of a stator and a rotor in the pump system cannot be influenced by gravity; accordingly, the working state of the pump system in the pit is well simulated, and the movement working conditions of various mediums in the perpendicular flow direction are simulated precisely. The metal screw pump vertical type simulation experiment method has the following remarkable advantages that 1, by means of the perpendicular experiment device structure, vertical installation of the stator and the rotor is achieved, and the fit clearance of the stator and the rotor is prevented from being influenced by the gravity; and 2, the movement working conditions of the various mediums (sand, gas and the moisture content) in the perpendicular flow direction are simulated precisely.

The invention discloses a solar wing flexible simulator. The solar wing flexible simulator comprises a base, a first simulating part, a second simulating part, a third simulating part and a torque sensor, wherein the first simulating part, the second simulating part and the third simulating part are sequentially connected and are installed on an air floating platform through the base connected with the first simulating part; the first simulating part is used for simulating the rotating inertia and the frequency of the first-order mode of a solar wing; the second simulating part is used for simulating the rotating inertia and the frequency of the sixth-order mode of the solar wing; the third simulating part is used for simulating the rotating inertia and the frequency of the twelfth-order mode of the solar wing; and the torque sensor is arranged at the position, close to the air floating platform, of the simulator and is used for measuring the torque output by the simulator to the air floating platform. The solar wing flexible simulator can analyze influences of different rotating inertias and different mode frequencies on a spacecraft body structure, and on the basis, the solar wing structure can be subjected to optimized design.

A megawatt-grade hydroelectric generation simulation system comprises a first 10-kV busbar, an input switch cabinet, a high-voltage frequency converter, an output switch cabinet, a variable-frequency speed regulating asynchronous motor, a torque and rotational speed sensor TN, a synchronous motor, an excitation cabinet, an excitation transformer cabinet, a grid-connected switch cabinet and an operating table. The first 10-kV busbar is sequentially connected with the input switch cabinet, the high-voltage frequency converter, the output switch cabinet, the variable-frequency speed regulating asynchronous motor, the torque and rotational speed sensor TN, the synchronous motor and the grid-connected switch cabinet; the high-voltage frequency converter is further connected with the grid-connected switch cabinet, the excitation transformer cabinet, the excitation cabinet, the torque and rotational speed sensor TN and the operating table; the operating table is further connected with the grid-connected switch cabinet. The megawatt-grade hydroelectric generation simulation system is high in automation degree and expandability, simulates the running characteristics of a hydroelectric generating set through software control and also can be used for simulating the running characteristics of the other electric generation forms such as a gas turbine and a diesel generator through software extension.

A constant force device based on an air spring comprises a mechanism adapter piece (1), a cylinder body (2) and the like. The mechanism adapter piece (1) is installed at one end of the cylinder body (2), and an air floating supporting stop block (10) is installed at the other end of the cylinder body (2); an air-suspending piston (3) is installed in the cylinder body (2); an air floating support (5) is fixedly installed in the cylinder body (2) and axially limited through the air floating supporting stop block (10), one end of a piston rod (4) is connected with the air-suspending piston (3), the other end of the piston rod (4) sequentially penetrates through the air floating support (5) and the air floating supporting stop block (10) and then is connected with an air floating bearing (7) through a screw (6); and a first air inflow plug (8) and a second air inflow plug (9) are installed on the portions, on the two sides of the air-suspending piston (3), of the side wall of the cylinderbody (2). The constant force device is based on air pressure control, has certain bearing capacity and is an air constant force device which is low in rigidity, damping and friction.

The invention discloses a transformer simulation model for accurately simulating characteristics of an iron core. The model simulates excitation characteristics of the iron core of a transformer through a hysteresis loop, can accurately simulate hysteresis characteristics of the iron core, further improves the accuracy of electromagnetic transient simulation of a power system, and simulates the influence of transformer iron core remanence on the power system by setting an remanence value of the iron core. In addition, the transformer simulation model adopts a current source to simulate an excitation branch of the transformer and does not change a system matrix of simulation software in the simulation process, so that the simulation speed is improved.

The invention provides a method for realizing remote sensing image simulation under a given external orientation element. The method comprises the following steps: (1) inputting initial data; (2) calculating coordinates of a simulation image element in an image space coordinate system; (3) calculating a spin matrix from the image space coordinate system to an object space coordinate system, and transforming the coordinates of the simulation image element of the step (2) from the image space coordinate system to the object space coordinate system; (4) solving an undetermined proportionality coefficient in a coordinate equation; (5) solving coordinates of a center point of a ground imaging area corresponding to the simulation image element; (6) solving coordinates of four vertexes of the ground imaging area corresponding to the simulation image element; (7) determining an original surficial image element contained in the simulation image element, and calculating a solid angle of the original surficial image element in an instantaneous field of view of the simulation image element; and (8) transforming spatial resolution, and generating a remote sensing simulated image under the external orientation element of a given sensor. The method solves the problem of realizing high precision simulation of the remote sensing image by the external orientation element and a viewing angle under the position and posture of the given sensor.

The invention discloses an anti-vibration shaft well test apparatus and a reconstruction method thereof. The apparatus comprises a shaft well, an excitation system and a control system, wherein the excitation system comprises six horizontal vibration exciters and one vertical vibration exciter, the horizontal vibration exciters and the vertical vibration exciter are arranged in the shaft well, andthe control system controls the horizontal vibration exciters and the vertical vibration exciter to carry out anti-vibration test on a test device in the shaft well, so the test ability of the anti-vibration shaft well test apparatus is improved.

The invention discloses a method for detecting a small target based on view angle conversion in a sea-sky-line scene. The method comprises the following steps: acquiring a to-be-detected image; identifying a sea-sky-line; selecting an effective rectangular area of the to-be-detected image; transversely segmenting the effective rectangular region into N2 image blocks, wherein an overlapping region exists between two adjacent image blocks; arranging the N2 image blocks in N rows and N columns to obtain a recombined image; detecting sea surface targets in the recombined image by using a deep learning network model, obtaining first coordinate information of each sea surface target, and combining the first coordinate information of each sea surface target into a first coordinate information set; and converting the first coordinate information of each sea surface target into second coordinate information of the sea surface target in the to-be-detected image, and forming a second coordinate information set. According to the invention, the detection precision of small target ships and small target buoys near the sea-sky-line is improved through the selection of the effective area and the recombination of the image blocks.

The invention discloses a numerical algorithm for simulating self-adaptive expansion of cracks, which comprises the following steps of: S1, determining a solving region according to a target problem of crack expansion, taking a region in which the cracks are not expanded in the solving region as a continuous solving region, and carrying out solving calculation on the crack expansion in the continuous solving region by utilizing a clone point technology; s2, the maximum tensile stress and the Mohr-Coulomb composite strength criterion act on the grids in the continuous solution domain to serve as the basis of crack initiation and the extension direction, and grid reconstruction is conducted in the crack initiation area; and S3, inheriting original grid information into the newly generated grid by adopting a space mapping technology, setting a contact surface at the newly added crack surface, and performing mechanical characteristic description of the crack surface by adding normal and tangential springs in the contact surface. According to the method, the dynamic expansion process simulation of the crack is realized, the problem that the crack expansion path is limited by the initial grid topology is solved, and the accurate simulation of the crack expansion direction is realized.

The invention provides a lumbar vertebra segment internal fixation mode simulation method and system based on deep learning. The method comprises the following steps: acquiring a CT lumbar vertebra segment scanning image; segmenting the obtained CT lumbar vertebra segment scanning image to obtain a vertebral body structure image; reconstructing a three-dimensional vertebral body model based on the segmented vertebral body structure and carrying out preprocessing; on the basis of the preprocessed three-dimensional vertebral body model, adding and assembling lumbar vertebra segment components to obtain a fixed three-dimensional lumbar vertebra segment model; on the basis of the three-dimensional lumbar segment model, carrying out grid division on the components of the model; carrying out finite element analysis on the basis of the three-dimensional lumbar segment model subjected to grid division to obtain a simulation result of a lumbar segment internal fixation mode; according to the method, the deep learning U-Net network is used for segmenting the image, the current situation that image annotation is troublesome and laborious is improved to a great extent, and a more accurate three-dimensional vertebral body model can be obtained.

The invention discloses a small experiment chamber capable of simulating a complex environment. The small experiment chamber comprises a horizontal cylindrical chamber body and is characterized in that a cylinder part of the chamber body is transparent; one end of the chamber body is sealed by using a metal material and provided with an air inlet, an extraction opening and a data line joint, wherein the air inlet and the extraction opening are communicated with the inside and the outside of the chamber body; the other end of the chamber body is provided with a metal chamber door capable of being opened and closed; each of the metal chamber door and the metal sealed end of the chamber body is provided with a heating and cooling device; the outer wall of the cylinder of the chamber body is provided with a magnetic field generating device; the air inlet is connected with an air input device and an ultrasonic atomizer; the extraction opening is connected with a vacuumizing device; the chamber body is internally provided with a magnetic field sensor for acquiring a magnetic field signal, a pressure sensor for acquiring a pressure signal, a temperature sensor for acquiring a temperature signal and a humidity sensor for acquiring a humidity signal; and all the signals are processed by a microcomputer through the data line joint, and an instrument is given, so that the simulation control for the complex environment inside the chamber body is realized through the magnetic field generating device, the air input device, the acuumizing device, the heating and cooling device and the ultrasonic atomizer.

The invention discloses an arc model construction method and system. The method comprises the steps that electric arc conductance is calculated according to acquired electric arc data, then mayr electric arc resistance and cascode electric arc resistance are acquired, a proportionality coefficient is set, and the mayr electric arc resistance and the cascode electric arc resistance are connected inseries according to the proportionality coefficient, so that electric arc stable resistance is acquired. Then establishing a first function relational expression and a second function relational expression; and finally, constructing an arc model according to the first function relational expression, the second function relational expression, a principle equation based on a mayr arc model and a principle equation of a class arc model. Compared with the prior art, the constructed arc model is wide in application range, the arc model can be dynamically constructed for the high-resistance arc andthe low-resistance arc by reasonably setting the proportionality coefficient, accurate simulation of the arc voltage and the arc current is achieved, and the experimental research efficiency of the arc is effectively improved.

The invention provides an excitation inrush current simulation method and device for an ultra-high voltage transformer under a condition of no-load closing. The excitation inrush current simulation method comprises the following steps: on the basis of the transitional area between the linear area and the non-linear area of the non-hysteresis curve, non-hysteresis magnetization intensity indicated by Langvin function is corrected; the corrected non-hysteresis magnetization intensity is utilized to establish a J-A magnetic hysteresis model; the parameters of the J-A magnetic hysteresis model are recognized; an analysis is conducted on the ultra-high voltage transformer and the differential magnetic susceptibility equation is determined; through the J-A magnetic hysteresis model and the differential magnetic susceptibility equation, the excitation inrush current of the ultra-high voltage transformer under the empty charging condition is determined. The excitation inrush current simulation method and device for the ultra-high voltage transformer under the condition of non-load losing correct the non-hysteresis magnetization intensity, enable the transitional area between the linear area and saturation area of the non-hysteresis curve to be closer to a true value and accurately simulate the magnetization characteristics of the transformer; moreover, the special construction of the ultra-high voltage transformer is considered and the excitation inrush current of the ultra-high voltage transformer under the condition of empty charging is simulated. Errors in the simulation are reduced.

The invention discloses a numerical control machine tool unobservable link simulation method and device, a terminal and a storage medium, and the method comprises the steps: generating a first training set according to the test data of an unobservable link, and obtaining a prediction model corresponding to the unobservable link based on the training of the first training set; adding the prediction model into a digital twinborn model of a target numerical control machine tool, obtaining input simulation data of an unobservable link based on a preorder link of the unobservable link in the target numerical control machine tool, inputting the input simulation data into the prediction model to obtain output simulation data of the unobservable link, and outputting the output simulation data to the target numerical control machine tool. Realizing simulation operation in the digital twin model of the target numerical control machine tool according to the output simulation data; and updating a prediction model in the digital twin model of the target numerical control machine tool according to a simulation operation result. According to the method, accurate simulation of the numerical control machine tool including unobservable links can be realized.

The invention discloses an evaluation method based on the influence of the shared memory accompanying the program group on the program execution time. Based on the given program to be tested, the program execution mode and the characteristics of the hardware platform, the impact of the shared memory on the program in the multi-core embedded system is evaluated. The impact of time, the steps are as follows: S1, build a simulation platform based on the given execution mode and hardware platform characteristics, S2, execute the program to be tested and the designed accompanying program group under the given execution mode, and obtain the execution time data, S3. Using the curve fitting method to obtain the fitting curve of the data, and through the test of the entire accompanying program group, sum up the influence of different accompanying programs on the execution time of the test program. This evaluation method achieves accurate simulation of actual application scenarios through the construction of the experimental platform and the setting of the program execution mode. On the simulation platform, the method uses a set of companion programs that cover a wide range of memory access patterns and are able to cover most real-world implementations.

The invention discloses a motion target curve control PVT data construction method. The method comprises the following steps: sampling target motion data; obtaining a target motion curve position-time point numerical discrete description needing to be simulated; setting a motion starting and ending position guide section; performing spline interpolation, calculating to obtain a matched position-speed data point pair array, and forming PVT data for motion control by combining a corresponding moment distribution array; reconstructing a complex curvilinear motion trajectory, and controlling the target to move according to the planned trajectory. According to the method, the real-time position tracking precision is greatly improved, and accurate simulation of any form of motion curve can be realized; it is ensured that the simulation motion device smoothly transits from a static state to a target motion state; meanwhile, kinematics parameter information of a motion curve is increased, and the stability of target motion tracking is improved.

The invention discloses a brake test device for a two-wheeled motorcycle. The brake test device comprises a main drive system, a loading system, a wheelbase adjustment system, a chassis and an electric control system. A front roller and a rear roller of the main drive system are linked by a trapezoidal telescopic drive shaft; a motor is connected to one side of the rear roller in a length direction; and an inertia roller is connected to one side of the front roller in a length direction. Auxiliary rollers in the loading system are arranged at the two sides of the front roller and the rear roller respectively. The part of the front roller in the main drive system is installed at the wheelbase adjustment system; and the loading system is installed at the wheelbase adjustment system. A rotational speed torque sensor is arranged at one end of the rear roller of the main drive system; the rotational speed torque sensor and a pressure sensor arranged at the loading system are connected withthe electric control system. The main drive system, the loading system, and the wheelbase adjustment system are installed on the chassis. With teh wheelbase adjustment system, motorcycle testing withdifferent wheelbases is realized.

The invention discloses an MMC flexible direct-current system. The MMC flexible direct-current system comprises a first converter station and a second converter station, wherein the first converter station and the second converter station are connected through a direct-current circuit and each comprise an alternating-current system, a main circuit breaker, a transformer and multiple bridge arms, each alternating-current system, the corresponding main circuit breaker and the corresponding transformer are sequentially connected in series, every two corresponding bridge arms are connected in series to form a phase of bridge arms, the number of the phases of the bridge arms is three, and the phases of bridge arms are connected in parallel and then are connected with the transformers in series; each bridge arm comprises a bridge arm reactor and a valve bank which are connected in series, each valve bank comprises multiple sub-modules, in the open circuit state, the sub-modules are equivalent to a series circuit of a resistor and a capacitor, and in the short circuit state, the sub-modules are equivalent to an inductive circuit. During real-time digital simulation, inversion does not need to be conducted on an admittance matrix again, in this way, a large amount of calculation time can be saved, the real-time simulation step size is reduced to smaller than several microseconds according to requirements, and accurate simulation of the MMC flexible direct-current system is achieved.