126 results about "Power simulation" patented technology

The invention discloses a hybrid micro-grid load control method, system and device and a storage medium, and the method comprises the steps: carrying out the feature extraction of historical operation data in a hybrid micro-grid, and obtaining a power factor distribution set of multiple types of loads; performing time sequence analysis on the power factor distribution set, and performing fusion processing on an increment information sequence obtained based on an analysis result to obtain load dynamic power characteristic description data; performing parameter correction on the load power simulation model based on the load dynamic power characteristic description data to obtain a first digital twinborn model; performing secondary correction on the first digital twinborn model based on the load power characteristic subset to obtain a second digital twinborn model; and inputting the real-time operation data into the second digital twinborn model to obtain second reactive power demand data, and executing a load control instruction of the hybrid microgrid generated by the second reactive power demand data. According to the method provided by the invention, the operation stability of the hybrid microgrid is improved.

The invention relates to the field of power simulation optimization, in particular to a new energy charging simulation optimization method and device based on a charging and discharging test platform. The method comprises the following steps of performing new energy charging pile charging simulation based on a charging and discharging test platform, performing adjustable power time period analysis, and generating a plurality of adjustable power windows; performing timing sequence energy flow trend change mining and dynamic power distribution fitting according to the plurality of adjustable power windows, and constructing a dynamic power path distribution map; performing minimum power drift point detection according to the dynamic power path distribution map, and performing power fluctuation compensation inversion to obtain power fluctuation compensation configuration parameters; and performing local dynamic power regulation according to the power fluctuation compensation configuration parameters, and constructing a local window dynamic power regulation strategy. Through dynamic charging simulation, the power stability of new energy charging is improved, and the power response balance is optimized.

The invention discloses an intelligent planning method for a power distribution network, and the method comprises the steps: dividing the power distribution network into a plurality of functional blocks, collecting and classifying the power data of power consumers, generating a change curve based on the data, predicting the power demands, and obtaining a prediction curve of the power data size. Performing digital twinborn modeling and computing power simulation on each functional block, and recording simulation computing power indexes; establishing a fitness function according to the power data prediction curve and the calculation power index, and evaluating the twin communication matching degree of the function block and the power distribution network; according to the fitness index, evaluating the priority of the time sequence nodes and layering the time sequence nodes, finally determining the time sequence nodes needing to be adjusted, and dynamically planning the power distribution network. According to the method, regional power utilization characteristics can be accurately mastered, the system state and the computing power demand are evaluated in advance, the communication matching degree is accurately evaluated, potential problems are found in time, resource allocation is optimized, the operation stability and efficiency of the power distribution network are improved, and reasonable utilization and efficient management of resources are achieved.

The invention discloses a power supply integrity simulation optimization method and device, equipment and a medium, and relates to the technical field of computer simulation, and the method comprises the steps: importing a to-be-simulated PCB design file into a simulation software tool; setting simulation parameters and constraint conditions in the simulation software tool, and operating the simulation software tool to perform power supply integrity simulation analysis and obtain a current simulation result; if the result is that the simulation test is not passed, inputting the current simulation result into a pre-trained power supply simulation dialogue large model to obtain a current optimization suggestion output by the model; the large power supply simulation dialogue model is obtained based on training of a training data set, and the training data set comprises historical simulation results and historical optimization adjustment measures; and adjusting the PCB design file based on the current optimization suggestion, importing the adjusted PCB design file into a simulation software tool for simulation analysis, and adding a current simulation result and a corresponding current optimization adjustment measure into a training data set after the simulation test passes.

The invention discloses a whole vehicle power hardware-in-the-loop simulation test system and method under a P2.5 + P4 hybrid architecture. The whole vehicle power hardware-in-the-loop simulation test system comprises a controller, a test cabinet and an upper computer system, the hybrid power gearbox control system is electrically connected with the high-voltage control system; the test cabinet is electrically connected with the hybrid power gearbox control system, the high-voltage control system and the upper computer system; the upper computer system comprises a management module, a signal interface module, a controller interface module and a virtual simulation vehicle module, the management module is connected with the test cabinet and the signal interface module, and the signal interface module is used for realizing signal interaction between the controller interface module and the management module; the controller interface module is connected with the signal interface module, the Soft ECU module and the power simulation module. Standardized development of the power simulation test system is realized, the modular design supports rapid adaptation of different vehicle type platforms and power architectures, and repeated development is reduced.

The invention relates to the technical field of electric power simulation, and discloses an electric power system data parallel simulation processing method based on distributed modeling. The method comprises the following steps: acquiring voltage, frequency and power parameters of a new energy inverter and an energy storage converter, and generating a state switching feature vector through a fuzzy C-means algorithm; determining and calculating a load abrupt change subsystem according to the load index overrun, and calculating the electrical coupling strength with an adjacent subsystem; allocating reserved computing resources for the mutation subsystem through a particle swarm optimization algorithm to form a dynamic resource allocation table; and adjusting the data synchronization period of the mutation subsystem to an extended time window, and continuing parallel simulation after the adjacent subsystems wait for boundary data. According to the method, the problems that in an existing power system data parallel simulation processing method based on distributed modeling, the calculation load abrupt change and the data synchronization failure caused by strong nonlinear component state switching cannot be processed are solved.

The invention belongs to the technical field of intelligent monitoring, and particularly discloses an air-ground data-driven complex steel structure construction mechanics twinborn model automatic establishment and performance prediction method. Comprising the following steps: establishing a target optimization function which takes the surface coverage rate of a structure as a core index to carry out optimization design of the number of observation stations and a space layout path; reverse reconstruction of the three-dimensional geometric digital twin model of the structure is completed; self-adaptive updating of the designed finite element model is achieved through coordinate registration and parameter correction, and a mechanical twinborn model reflecting the real working condition is generated; and carrying out construction static force and operation period power simulation based on the mechanical twinborn model. The geometry-mechanics integrated modeling process provided by the invention can effectively reflect the real state of the structure at the construction stage, and improves the construction quality control and safety evaluation capability; meanwhile, the method has high automation and universality, and is suitable for digital modeling and monitoring requirements of multi-type and large-scale complex steel structures.

The invention relates to the technical field of power transmission line icing disaster monitoring, in particular to a power transmission line deicing jump tripping risk early warning method, system and device and a storage medium. The visual monitoring device captures the motion trail of the ground wire in real time and calculates the spatial distance, meanwhile, a three-dimensional power simulation model of the power transmission line is constructed to simulate and calculate the jumping process of the wire after deicing, and the distance data obtained through the two means are fused to form the minimum insulation distance; on the basis of wire tension changes and ice coating thickness abrupt changes collected by the ice coating monitoring terminal and wire displacement characteristics captured by the visual monitoring equipment, the occurrence of a deicing jump event is judged through multi-source data cross validation; and when it is judged that the ice-shedding jump event occurs, the discharge voltage is calculated according to the minimum insulation distance in combination with the standard discharge characteristic curve, the discharge voltage is compared with the line operation voltage to obtain a voltage margin, tripping risk grading evaluation is performed based on the voltage margin, and corresponding early warning information is output. The problem that a dynamic process cannot be captured by traditional static monitoring is solved.

The invention relates to the technical field of electric power simulation, and discloses a hardware-in-the-loop simulation-oriented new energy equipment model verification method and system, and the method comprises the steps: constructing a new energy equipment basic model based on a physical equation, carrying out the compensation of a dynamic working condition error through combining with an LSTM neural network, and generating a hybrid parameterized model; fitting voltage and current data through a particle swarm optimization algorithm, and dynamically adjusting impedance parameters to complete model calibration; a time domain step response test, frequency domain characteristic analysis and a voltage sag fault experiment are executed on a hardware-in-loop platform, and the performance of the model is verified in a multi-dimensional mode; and generating a standardized verification report containing a steady-state error and a simulation step length index based on the deviation between the dynamic response curve and the measured data. According to the method, a mechanism model and a data driving technology are fused, the problems that dynamic characteristic adaptation is insufficient and parameter calibration depends on experience in traditional verification are solved, and the simulation precision and verification efficiency of the model under complex working conditions are improved.

The invention relates to the technical field of hydraulic engineering digital twinning, and discloses an avionics hub dynamic flood digital twinning deduction method and system fusing a hydrodynamic model, and the method comprises the steps: collecting multi-source observation data to form a space-time coding original data set, constructing a hydrodynamic boundary parameter set, and carrying out the digital twinning deduction of the dynamic flood of an avionics hub; constructing a two-dimensional unsteady state hydrodynamic calculation model based on the parameter set, assimilating newest monitoring data online to update model parameters, mapping a hydrodynamic simulation state field to a three-dimensional terrain grid to generate a three-dimensional twin rendering scene, and calculating a submerging index and a scheduling benefit index based on the scene; and a scheduling optimization scheme set is generated and an execution control instruction is issued, so that dynamic deduction, multi-target optimization scheduling and closed-loop control of the flood process of the avionics hub are realized, and the accuracy and timeliness of flood control decision are improved.

The invention relates to the technical field of ocean science education, in particular to an ocean current motion science popularization simulation system. Comprising a power simulation unit, a water flow control unit, a visualization unit and an interaction control unit, wherein the power simulation unit is used for comprehensively simulating various power sources and interaction of ocean current motion through a multi-power coupling simulation system and a green energy-saving driving device. By arranging the wind power simulation module, the thermohaline driving module and the earth rotation force simulation module, main driving force influencing ocean current in nature and interaction of the main driving force can be comprehensively simulated. Especially, a dual ground rotation force simulation mechanism based on a rotating platform and algorithm correction is introduced, so that the abstract Coriolis force effect is visually presented, and the teaching authenticity and scientific interpretation strength of the ocean phenomenon are remarkably improved.

The invention discloses a system and method for testing the braking condition of a deepwater power source, and relates to the technical field of underwater power source digital testing, and the system comprises a power simulation device which is used for simulating the power source to provide normal working kinetic energy for underwater equipment; the braking simulation device is used for simulating braking kinetic energy provided by a braking source for underwater equipment during energy consumption braking; the testing device is connected with the power simulation device and the braking simulation device, and is used for switching working kinetic energy provided by the power simulation device into braking kinetic energy provided by the braking simulation device during energy consumption braking, collecting electric parameters output by the braking simulation device after the braking kinetic energy supplies energy to underwater equipment, and transmitting the electric parameters to the testing device; and the system performance of the deepwater power source under the braking condition is verified by using the electrical parameters. Data reference is provided for the system design of the actual underwater power source, and the overall system performance of the underwater power source under the braking condition is further accurately verified.

The invention discloses a parallel simulation processing method and device for multiple agents, terminal equipment and a storage medium, and belongs to the field of power simulation systems.The method comprises the steps that basic parameters of power equipment in a power system, topological structures among the power equipment and interaction relations among the power equipment are obtained; based on the simulation model modeling parameters, a simulation model agent corresponding to each power device is constructed; determining a plurality of target agents in the plurality of simulation model agents according to a simulation scene selected by a user, and determining operation scene data of each target agent based on the simulation scene; inputting each piece of operation scene data into each corresponding target agent to obtain operation simulation data corresponding to each target agent; and receiving operation simulation data generated by all the target agents, and obtaining a simulation report. According to the invention, the simulation efficiency of multi-device simulation of the power system can be improved.

The invention provides a power performance simulation checking method and device for an electric vehicle, and solves the technical problem that the development period and the development capability of the whole vehicle are deficient due to the lack of power performance simulation checking service in the overall design of the existing vehicle. The method comprises the following steps: acquiring an initialization parameter of a subsystem related to a vehicle dynamics model; forming a power simulation model of the power system according to the initialization parameters; calculating the operation power and the operation torque of the driving motor according to the power simulation model, and forming a performance characteristic fitting curve according to the rotating speed of the driving motor; fitting a maximum acceleration curve according to the performance characteristic fitting curve in combination with the initialization parameters; determining the acceleration time for the vehicle to reach the target speed according to the maximum acceleration curve; and determining the maximum speed achieved by the vehicle according to the maximum acceleration curve in combination with the initialization parameters. A simulation check service is provided for the overall design of the vehicle, the development period of the whole vehicle is shortened, and the digital research and development capability of the electric vehicle is effectively improved.

The application relates to the technical field of water power simulation, and particularly discloses a water power simulation method and system for an underwater robot, which comprises the following steps: setting pressure detection points on the surface of a robot model; acquiring real-time pressure containing positions and time based on the pressure detection points, and constructing pressure samples; clustering the pressure samples, querying pose parameters and power parameters of the underwater robot according to the time of the pressure samples for each type of pressure sample, and constructing a regression model of the power parameters to the pose parameters; for the real-time acquired pressure samples, determining target type pressure samples in the clustering results, reading the regression model corresponding to the target type pressure samples, and performing water power simulation on the power parameters; the application determines environmental conditions based on sensing points, reads the regression model to perform water power simulation, and the workload of the control module is only reading data, applying functions and outputting instructions; under the premise of a certain accuracy, the response speed is extremely fast.

The application discloses a layout design method and device for a ventilation pressure regulating facility of an underground water storage cavern, and the method comprises the following steps: determining layout parameters of a tunnel group of the water storage cavern; constructing a water power simulation model of the water storage cavern composed of the tunnel group based on a one-dimensional water flow motion control equation; solving a distribution of a water hydraulic characteristic value along a path under a non-constant flow condition according to the water power simulation model, determining a space-time distribution of a tunnel section in a pressurized state and a non-pressurized state, judging a required ventilation amount according to the space-time distribution, and initially drafting a layout scheme of a cavern ventilation pressure regulation; adjusting the layout parameters, checking and analyzing whether the layout scheme of the ventilation pressure regulating facility is reasonable under the non-constant flow operation condition, and correcting the layout parameters of the water power simulation model established based on the one-dimensional water flow motion control equation according to a calculation result; and repeating the steps of adjusting, checking and correcting until a reasonable layout scheme of the ventilation pressure regulating facility is constructed.

The application discloses a kind of construction methods of power battery system power simulation model, belong to power battery simulation technical field, this method includes: selecting the three kinds of sample monomer battery with lowest, highest and mean value internal resistance;Equivalent circuit model corresponding to unit is constructed based on the characteristic parameters of sample monomer battery;Unit equivalent circuit model is expanded to the battery module equivalent circuit model for characterizing corresponding battery group, and battery module equivalent circuit model is connected in series to form system level equivalent circuit model;The basic parameters, quality and thermal management scheme of monomer battery are combined to construct the thermal management model corresponding to each battery module;System level equivalent circuit model, each thermal management model and pulse charge-discharge condition model are thermoelectric coupling, and power simulation model is obtained.The application is equivalent to modeling by representative sample, and the influence of battery consistency difference on system power is truly reflected, and the problem of large amount of calculation and insufficient precision of traditional modeling is solved.

The invention discloses a user skill portraying method and system for electric power simulation training. According to the method, user operation behaviors in electric power simulation training are comprehensively collected and analyzed, a multi-dimensional user portrait is generated, dynamic scoring is performed according to actual performance of a user, and finally comprehensive evaluation of user operation capability and skill portrait display are realized. According to the scheme of the invention, more efficient, accurate and fair user evaluation is provided.

The invention discloses an electric power simulation adaptability test processing method for a new energy unit, and relates to the technical field of simulation testing, the method comprises the following steps: obtaining PLL bandwidth and controller time constant upper and lower limits, and generating a plurality of parameter combinations; applying each combination to a model, simulating under the disturbance of a preset power system, and collecting dynamic response and numerical stability information for preliminary screening to obtain candidate parameter combinations; the method comprises the following steps: selecting a candidate combination, collecting simulation state information of the candidate combination, calculating a priority selection index, and selecting a group with the maximum index as a final optimization parameter. The optimal PLL bandwidth and controller time constant can be found to balance the dynamic response speed and stability of the electric power simulation model in the electric power system environment, and reasonable global balance is formed between the PLL bandwidth and the controller time constant, so that the applicability of the final electric power simulation model does not deviate to a certain side; and the reliability of behavior prediction of the new energy unit in the power system is improved.

The invention discloses an automobile air bag computer diagnosis system, relates to the field of electrical testing, and realizes full-process fine control of ECU mirror image writing through byte-level differential management, three-model parallel simulation verification and two-stage judgment strategies. A system leads out an ECU original mirror image and generates an SHA256 snapshot, a target mirror image is compared byte by byte to form a differential bitmap DIFFmap, and the differential bitmap DIFFmap is aggregated into a minimum write-in unit according to pages, so that the write-in amount and flash memory wear are reduced, and the write-in success rate is improved. The simulation verification unit parallels a plurality of models and dynamically recognizes a high-risk mirror image through weighted combination and a two-stage judgment strategy, and the write-in verification unit adopts segment-level CRC32 and global SHA256 verification and guarantees write-in atomicity and rollback traceability through two-stage submission, atomic switching and exponential backoff retry. And the cloud and local operation and maintenance module generates a compliance diagnosis report and provides authorization management, so that data security synchronization and edge cloud cooperative processing are realized. According to the scheme, the safety, the reliability and the traceability of ECU updating operation are remarkably improved.

A novel air bridge device with a calibration-free function belongs to the technical field of aircraft power simulation tests. In order to solve the problem that the air bridge is damaged or its relative position with the balance changes during the test, the present invention must re-complete the full-process calibration to obtain the interference force on the balance. The first straight pipe, the second straight pipe, the L-shaped bend pipe and the third straight pipe are connected end to end in sequence, and elastic ventilation devices are provided at the interfaces between the first straight pipe and the second straight pipe, between the second straight pipe and the L-shaped bend pipe, and between the L-shaped bend pipe and the third straight pipe. The upper end of the first straight pipe is connected to the measuring end of the balance, the right end of the third straight pipe is connected to the fixed end of the balance, and the axis of the third straight pipe is perpendicular to the axis of the first straight pipe and the second straight pipe. The novel air bridge device with a calibration-free function of the present invention can quickly obtain the interference force on the balance without performing the overall calibration of the air bridge and the combined calibration with the balance.

The invention discloses a power system operation mode generation method and device, terminal equipment and a storage medium, and belongs to the technical field of operation mode generation, and the method comprises the steps: obtaining active power data, a preset network topology model and a reactive load of a first node of a power system in a preset long-scale time period, carrying out direct-current power flow calculation and reactive compensation to obtain operation mode data of a long-scale time period; performing frequency simulation on the operation mode data in the long-scale time period, and generating a power simulation curve; and extracting a minute-level active power value from the power simulation curve, calculating a reactive load of a second node and a second reactive injection amount according to the minute-level active power value, and then generating minute-level power system operation mode data. Through the implementation of the method and the device, the problem that in the prior art, due to the fact that a minute-level short-time-scale operation mode cannot be generated, safety and stability analysis is difficult to carry out on the electric power system more accurately can be solved.

The invention provides a method for simulating wind power fluctuation of a prototype of a hydrogen production and storage system. The method comprises the following steps: determining a time calendar curve of generated power of a fan; scaling the time calendar curve of the generated power of the fan, and obtaining an assumed time calendar curve of the generated power of the fan according to a scaling result; determining a power change function of the developed prototype; obtaining a time calendar curve of current or voltage of the hydrogen production and storage prototype in the fluctuation simulation test according to the power change function and the assumed time calendar curve of the fan generation power; generating and testing a software instruction of the upper computer so as to finish the simulation of the fluctuation of the power supply; the method has the beneficial effects that power fluctuation simulation can be completed without an external programmable power supply through comprehensive processing by combining power data of the fan and the hydrogen production and storage prototype, and fluctuation simulation of hydrogen production and storage power not only depends on fluctuation characteristics provided by the fan, but also depends on fluctuation characteristics provided by the fan, but also depends on fluctuation characteristics provided by the hydrogen production and storage prototype. The relation that the power of hydrogen production and storage varies along with current or voltage is also considered, so that more accurate power simulation is achieved.

The invention provides a new energy station power market transaction system and method suitable for spot transaction, and the system comprises a data collection sub-module, a data analysis and prediction sub-module, a transaction decision sub-module, a transaction execution and monitoring sub-module, and a risk early warning sub-module. The data acquisition sub-module is connected with the data analysis and prediction sub-module, the data analysis and prediction sub-module is connected with the transaction decision-making sub-module, the transaction decision-making sub-module is connected with the transaction execution and monitoring sub-module, and the transaction execution and monitoring sub-module is connected with the data analysis and prediction sub-module. The data acquisition sub-module and the transaction execution and monitoring sub-module are respectively connected with the risk early warning sub-module, and the risk early warning sub-module is connected with the transaction decision-making sub-module. The electric power simulation measurement and calculation precision can be improved, the transaction strategy can be optimized, and the profit level can be improved; the operation management efficiency is improved; and meanwhile, the new energy consumption and the development of the electricity market can be promoted.

The present invention discloses a wind farm collaborative control method and system based on an active pitch control strategy. The method includes: obtaining the wind turbine model, its wind turbine rotor diameter, and wind turbine arrangement information within the wind farm; constructing a wind farm output power simulation system under pitch angle conditions based on an established wind turbine pitch characteristic database, rotor diameter, and unit arrangement information, and combining it with a wind turbine analytical wake model; obtaining the operating data of each unit in the wind farm in real time and inputting it into the power simulation system to establish an optimization function with the pitch angle of each unit as the independent variable and the total power of the wind farm as the dependent variable; optimizing the optimization function to obtain the pitch angle combination of each unit with the maximum output power, and using the pitch angle optimization result as the control instruction for its active pitch control, thereby implementing collaborative pitch control for each unit in the wind farm. The present invention realizes more efficient and reliable online optimization control, and can achieve an increase in the total power of the wind farm without sacrificing the service life of the blades.

The invention discloses a virtual and real equipment combined electric power simulation training system and method, and relates to the technical field of electric power system simulation training, and the system comprises a virtual simulation module, a real equipment module, a data interaction module, and a man-machine interaction module. According to the method, equipment simulation operation and simulation training opportunities are provided for thermal power plant personnel through the virtual simulation module, and the defect that practical operation drilling cannot be carried out in a traditional training mode is overcome; a power system model library is constructed through the power system modeling unit, so that training is closer to an actual working scene; simulation debugging and optimization are carried out through a simulation system, so that the safety risk and potential loss caused by direct operation on a real system are avoided; through the combination of virtual simulation and an entity device, the authenticity of training is enhanced, training can be carried out more efficiently, and the training period is shortened.

The application discloses a kind of braking operating mode test system and test method of deepwater power source, it is related to underwater power source digital testing field, the system includes power simulation device, for simulating power source to underwater equipment provides normal working working kinetic energy;Brake simulation device, for simulating brake source to underwater equipment provides braking kinetic energy when energy consumption brake;Test device is connected with power simulation device, brake simulation device, test device is used to switch the working kinetic energy provided by power simulation device to the braking kinetic energy provided by brake simulation device when energy consumption brake, and after braking kinetic energy supplies energy to underwater equipment, the electric parameter output by brake simulation device is collected, and the system performance of deepwater power source under braking operating mode is verified using electric parameter.For actual underwater power source system design provides data reference, further realizes the overall system performance of underwater power source under braking operating mode is accurately verified.

The present invention provides a method and device for simulating a circuit breaker in an aircraft power simulation system, which are applied to the field of simulation system simulation technology. The method includes: obtaining the position status of a circuit breaker in the aircraft power simulation system from a vector container (vector), and obtaining the power supply status of a bus bar corresponding to the circuit breaker from a mapping container (map); and performing a logical operation based on the power supply status of the bus bar corresponding to the circuit breaker and the position status corresponding to the circuit breaker to determine the power supply status of the circuit breaker. Compared to the prior art method that requires calling and calculating each circuit breaker individually in header files and source files, this method eliminates the need for performing logical operations on each circuit breaker variable, thereby reducing workload, time consumption, and conserving resources.

The invention relates to an automatic conversion system and method for a multi-platform electric power simulation model, and the method comprises the steps: setting the appearance parameters of each element in an interface through a template construction module, so as to construct an element static template; the parameter setting module is used for initializing default parameters of each element; the element connection module is used for determining an element library corresponding to each line grade and a connection relationship between elements in the element library; and the model drawing module is used for selecting a corresponding element library according to the line grade so as to draw an electric power simulation model according to the element static template, the default parameter of each element and the connection relationship among the elements. The problems of long construction time, low efficiency, high error rate and the like of an electric power simulation model in the prior art are solved.

The invention discloses a photovoltaic module, a method and a device for determining the equivalent resistance of a solder strip of the photovoltaic module and a medium, the solder strip comprises n + 1 solder strip sections which are arranged in sequence, and the method for determining the equivalent resistance of the solder strip comprises the following steps: obtaining the theoretical current of each solder strip section in the solder strip; determining the loss power of the welding strip section according to the theoretical current of the welding strip section; determining the loss power of the solder strip according to the loss power of each solder strip section; and determining the equivalent resistance of the solder strip in the photovoltaic module to be detected according to the loss power of the solder strip and the maximum current in the current of each solder strip section. According to the technical scheme, the resistance of the welding strip in the photovoltaic module can be calculated without assuming that the welding strip is completely attached to the main grid, the requirement for calculating the equivalent resistance of the welding strip in the main-grid-free photovoltaic module can be met, and therefore the precision of power simulation of the main-grid-free module is improved.