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Articles 2611 - 2640 of 3977

Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

Performance Evaluation Of Automated Warehouse Based On Markov Chain, Xiangguo Ma, Tongjuan Liu, Wang Li, Rongfen Jiang Jun 2020

Performance Evaluation Of Automated Warehouse Based On Markov Chain, Xiangguo Ma, Tongjuan Liu, Wang Li, Rongfen Jiang

Journal of System Simulation

Abstract: It is necessary that the way of evaluating the AS/RS is scientific and feasible. However the majority of existing evaluate methods is static and qualitative, whose analysis results deviation, to a certain extent, from the real data. To support the improvement of the AS/RS use, the performance of AS/RS with a dynamic and quantitative method was analyzed. Specifically, the automated stereoscopic warehouse performance evaluation indicators were established; by using Marco analysis, the mathematical model of performance evaluation was got; based on ARENA software, the feasibility and validity of the mathematical solution model were verified.

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Novel Distance Measure Between Intuitionistic Fuzzy Sets, Luo Xiao, Weimin Li Jun 2020

Novel Distance Measure Between Intuitionistic Fuzzy Sets, Luo Xiao, Weimin Li

Journal of System Simulation

Abstract: Distance measure is a basic and crucial notion of set theory. Since the intuitionistic fuzzy sets (IFSs) were put forward, distance between IFSs has been widely concerned by some researchers and many types of measures have been proposed. Most of them have counter-intuitive cases and ignore the characteristics of three parameter properties of IFSs. The concept of fuzzy distance was introduced, which embodied the characteristics of classical distance and highlights the characteristics of hesitance index simultaneously. A new fuzzy distance measure was proposed, and the corresponding proof was included. An artificial benchmark test set of distance measure was constructed …

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Visualization Of Multi-Dimensional Effectiveness Indicator Of Weapon System Of Systemsbased On Fusion Manifold Learning, Jianfei Ding, Guangya Si, Yafeng Shi, Liu Yi Jun 2020

Visualization Of Multi-Dimensional Effectiveness Indicator Of Weapon System Of Systemsbased On Fusion Manifold Learning, Jianfei Ding, Guangya Si, Yafeng Shi, Liu Yi

Journal of System Simulation

Abstract: It is an important way to compare the comprehensive characteristics of weapon system of systems (WSoS) by means of visualization method to display the various effectiveness indicators information of WSoS construction planning scheme in simulation test. A visualization method for multi-dimensional effectiveness indicator was proposed based on fusion manifold learning. The indicator items and scheme items were converged from high-dimensional space to the same two-dimensional space. The density calculation was used to calculate the effect degree between the multidimensional indicator and scheme. The final multidimensional indicator visualization effect was achieved by radiological calculation. Two sets of experiments were …

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Construction Method Of Reconnaissance Assistant Decision Model, Guo Rui, Xiaoyuan He, Zhu Feng Jun 2020

Construction Method Of Reconnaissance Assistant Decision Model, Guo Rui, Xiaoyuan He, Zhu Feng

Journal of System Simulation

Abstract: The fog of war in modern battlefield information big data generated by the judgment of the battlefield commander had a strong interference, which could increase the difficulty of decision-making. The use of reconnaissance and early warning forces is the beginning of mastering the initiative of the battlefield. Intelligent auxiliary investigation command is to achieve this goal. On the basis of the simulation system field data of a certain operations, through extracting the key information of reconnaissance order, combined with establishing the labels of reconnaissance effect, an auxiliary decision model aimed at reconnaissance and early warning is designed. This model …

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Virtual Flight Modeling And Simulation Of Air-Launched Anti-Ship Missile, Zhipeng Sun, Guanghong Gong Jun 2020

Virtual Flight Modeling And Simulation Of Air-Launched Anti-Ship Missile, Zhipeng Sun, Guanghong Gong

Journal of System Simulation

Abstract: The relationship between the parameters affecting aerodynamic force was studied, and the aerodynamic coefficient was properly linearly simplified. According to the type of airborne anti-ship missile performance model, the "black box modeling" and extrapolation method was adopted to determine its aerodynamic coefficient, a typical anti-ship missile six degrees of freedom of the simplified dynamic model was established. By studying the flight phases after the missile launch, the flight trajectory model of each flight phase was established by using the control method of the track angle. The whole flight trajectory process of the missile attacking a target was realized and …

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Implementation And Application Of Complex System Modeling And Simulation Language Compiler, Zhou Wen, Chi Peng, Bohu Li, Song Xiao Jun 2020

Implementation And Application Of Complex System Modeling And Simulation Language Compiler, Zhou Wen, Chi Peng, Bohu Li, Song Xiao

Journal of System Simulation

Abstract: Simulation language is a key technology of integrated simulation based design software environment. A difficulty of developing simulation language is the compiler that automatically transfers simulation language Semantics to programming language such as C++. The contents and features of CMSL were introduced. And a compiler which could analyze simulation text written in CMSL was implemented. A decouple method for Discrete System was proposed and integrated in the compiler. The features object-oriented and components oriented of CMSL were verified by an example with its ability to describe discrete system.

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Research On Visual Objective Test Method Of High-Level Flight Simulator, Zhangfa Liu, Huiyong Li Jun 2020

Research On Visual Objective Test Method Of High-Level Flight Simulator, Zhangfa Liu, Huiyong Li

Journal of System Simulation

Abstract: With the development of commercial aircraft, the demand of high-level flight simulator will increase. In addition to development and production, qualification test is a key link to ensuring the quality of simulator. Visual system plays an important role of flight simulator. In order to meet the requirement of qualification from CAAC, visual objective test based on main qualification test guide of flight simulator was developed. It is very significant that test requirements, test theory and test methods of visual objective test item were researched deeply, including transport delay, field of view, system geometry, surface contrast, brightness, surface resolution, light …

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Modeling And Dynamic Research Based On Ritz Series For Ball Screw Drive System, Rongrong Qian, Minzhou Luo, Jianghai Zhao, Li Tao, Li Lu Jun 2020

Modeling And Dynamic Research Based On Ritz Series For Ball Screw Drive System, Rongrong Qian, Minzhou Luo, Jianghai Zhao, Li Tao, Li Lu

Journal of System Simulation

Abstract: To analyze the vibration performance of the ball screw drive system, the finite element model (FEM) of the simplified system by Ansys/Workbench was given to acquire the vibration mode and shape. Based on the vibration shape calculated from FEM, a set of hybrid basis function was used to generate the new Ritz series for building the system motion equation of the axial and torsional vibration. The pitch of the ball screw was considered in the method. A mathematical model which was easy to design the controller was developed. Through the numerical simulation, the modal characteristics and shape of …

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Thermal And Electric Load Coupling Analysis And Decoupling Coordinated Control In Heat Supply Units, Tuoyu Deng, Tian Liang, Jizhen Liu Jun 2020

Thermal And Electric Load Coupling Analysis And Decoupling Coordinated Control In Heat Supply Units, Tuoyu Deng, Tian Liang, Jizhen Liu

Journal of System Simulation

Abstract: Due to large scale wind power integration, heat supply units hardly meet the AGC (automatic generation control) requirement by the existed coordinated control system. It is necessary to analyze coupling characteristics of thermal and electric load thoroughly. A transfer function matrix including characteristics of heat supply part was gained by small deviation linearization of a dynamic unit's model. Coupling characteristics was analyzed based on variable pairings of the existed coordinated control system and decouplers were designed. Relative gain matrix measure and simulation were used to compare the coupling extent before and after decoupling. Simulation experiments show that adding static …

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Artillery Company Firepower Assignment Model And Algorithm, Xuezhi Lü, Lisheng Chang, Xianwen Wang, Xinhui Zhao Jun 2020

Artillery Company Firepower Assignment Model And Algorithm, Xuezhi Lü, Lisheng Chang, Xianwen Wang, Xinhui Zhao

Journal of System Simulation

Abstract: In view of deficiency of traditional firepower assignment method and characteristics of modern artillery, the model and algorithm of firepower assignment of artillery company were studied. The firepower assignment problem of artillery company was described, and the resolving concept was discussed. Three firepower assignment modes based on resolving concept were introduced. The idea of getting optimal solution of firepower assignment with Monte Carlo simulation and golden section search were analyzed. The model and algorithm were validated with an example.

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Travel Time Prediction Of Urban Road Based On Deep Learning, Weiwei Zhang, Ruimin Li, Zhongjiao Xie Jun 2020

Travel Time Prediction Of Urban Road Based On Deep Learning, Weiwei Zhang, Ruimin Li, Zhongjiao Xie

Journal of System Simulation

Abstract: Travel time prediction of urban road is a significant support for urban intelligent transportation system. Four types of LSTM neural network architecture were selected to predict the urban road travel time. The number of nodes in the LSTM hidden layer was fixed to determine the optimal input length of the model. The input length of the model was fixed and the predictive performance of the four LSTM models under different hidden layer nodes and considering spatial correlation were tested respectively. The performance of spatial LSTM model was compared with four traditional models, for example, BP neural network. The results …

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Image Retrieval Using Weighted Vocabulary Tree With Location Information, Chen Ying, Jiayu Guo Jun 2020

Image Retrieval Using Weighted Vocabulary Tree With Location Information, Chen Ying, Jiayu Guo

Journal of System Simulation

Abstract: Aiming at the positional information ignorance problem in image retrieval based on SIFT feature matching, an image retrieval approach using weighted vocabulary tree based on the spatial location information was proposed. The vocabulary tree is used in the method to quantify SIFT features as the visual words, converting the image match into the visual words' weight vector match. Because only visual words' weight match ignored the mutual position effect, SIFT points' spatial location information was generated, and was classified into the position effect of visual words according to affiliation between SIFT points and visual words. The spatial location information …

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Effect Of Properties Of Synchronous Belt On Vibration Characteristics Of A Polishing Machine, Baibing Sun, Zhongyu Piao Jun 2020

Effect Of Properties Of Synchronous Belt On Vibration Characteristics Of A Polishing Machine, Baibing Sun, Zhongyu Piao

Journal of System Simulation

Abstract: To form slurry film, hydrodynamic-suspension polishing machine needs polishing clearance extremely small, so any slight vibration will make tremendous influence on machining. The effect of different properties of synchronous belt on vibration characteristics of polishing machine was simulated by Workbench. Motion analysis shows the parameters which influence on transverse vibration of synchronous belt. Orthogonal test was designed and simulation was made by using above parameters. The results released that the material played an important role than the belt width and tension force. According to actual situation, optimum combination was obtained. Consequently, the stability of the machine was obviously improved. …

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Two Power Sliding Mode Neural Network Compensation Control For Space Robot After Target Capturing, Cheng Jing, Chen Li Jun 2020

Two Power Sliding Mode Neural Network Compensation Control For Space Robot After Target Capturing, Cheng Jing, Chen Li

Journal of System Simulation

Abstract: The impact analyses of space robot capturing a target and stability control problem in the post-impact process were discussed. The dynamic models of space robot system and target were derived by multi-body theory. The impact effect of rigidcouplingmodel was analyzed by applying geometric relationship and principle of momentum conservation. Atwo power sliding mode neural network control scheme was proposed for the combined system after acquiring with uncertain system parameters and external disturbance. The convergence speed of the control system was guaranteed by applyingtwo power sliding mode reaching raw, and the uncertain part was compensated by using neural …

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Modeling Of Steam Turbine's Governing System During Main Steam Valve Activity Test And Control Optimization, Sheng Kai, Shuangjian Peng, Xun Xin, Bochun Wang, Fu Qiang Jun 2020

Modeling Of Steam Turbine's Governing System During Main Steam Valve Activity Test And Control Optimization, Sheng Kai, Shuangjian Peng, Xun Xin, Bochun Wang, Fu Qiang

Journal of System Simulation

Abstract: A Model of 300 MW thermal power unit's governing system of steam turbine is established to analyze its load fluctuation during main steam valve activity test. The model contains three sub-models; they are the model of turbine's governor during main steam valve activity test, the model of electric-hydraulic servo actuator, and the model of turbine considering governing valve's discharge characteristic. The analyses on these models indicate that mismatch among control model, configuration of DEH (Digital Electric Hydraulic Control System) and characteristic of the unit is the cause of load fluctuation. Through simulation, the method for load fluctuation suppression was …

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Scheduling Problem Of Unidirectional Material Handling System With Short-Cut, Juntao Li, Kun Xia, Kise Hiroshi Jun 2020

Scheduling Problem Of Unidirectional Material Handling System With Short-Cut, Juntao Li, Kun Xia, Kise Hiroshi

Journal of System Simulation

Abstract: Unidirectional circulation-type material handling system on a single loop with a shortcut is a typical and basic unit in a flexible manufacturing system or logistics system. It is widely used in semiconductor wafer fabrication system. Superposition efficiency of the basic unit often determines the one of the whole system. Different scheduling rules impact the interference between AGVs and then have an important effect on the efficiency of the whole system. To decrease the interference and improve performance of the system, a mathematical model of this system was made, analyzing this system by simulation and comparing the merits and …

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Research On Highline Cable Parametric Design Platform Of Alongside Replenishment At Sea, Li Nan, Zhuobin Wei, Xuejun He, Shiyun Zhang Jun 2020

Research On Highline Cable Parametric Design Platform Of Alongside Replenishment At Sea, Li Nan, Zhuobin Wei, Xuejun He, Shiyun Zhang

Journal of System Simulation

Abstract: High cable is an important part of the horizontal replenishment equipment at Sea. Its performance directly affects the safety of replenishment at sea. Because there is not a suitable high cable dynamic model in the domestic, for the first time to take the high cable as a multi-body system and established the flexible-body dynamics model. Then the optimization design model of high cable which is on the basis of the model was established. Meanwhile it set up the parametric design platform of high cable by using ADAMS to parameterize the optimization design model. The optimization design results of a …

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Switching Characteristics Of Bjt And Pspice Simulation, Li Zi, Yuanbo Zhang Jun 2020

Switching Characteristics Of Bjt And Pspice Simulation, Li Zi, Yuanbo Zhang

Journal of System Simulation

Abstract: In Marx type pulsed power devices, the switch is the most important component to determine the rising time of output pulses. A novel switching device utilizing the avalanche breakdown characteristic between the collector and emitter of BJT,was proposed to replace the traditional switch. Impules voltage could be outputted in less than 5ns by Marx circuit using BJT which could be the alternative switch of general Marx generator. Different BJTs' avalanche breakdown characteristics between the collector and emitter were introduced, according to experimental results, some appropriate BJTs were chosen to be used in Marx generator. At present there is no …

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Research On Simulation Platform Based On Behavior Heterogeneity For Agriculture Biomass Energy, Liu Zhen, Dehui Xu, Kaiwei Zhu, Huilong Sun Jun 2020

Research On Simulation Platform Based On Behavior Heterogeneity For Agriculture Biomass Energy, Liu Zhen, Dehui Xu, Kaiwei Zhu, Huilong Sun

Journal of System Simulation

Abstract: To analyze the influence of different collecting mechanism, subsidies and prices on the amount of energy-utilized straw resource, based on behavior heterogeneity theory and Boltzmann learning algorithm, an agricultural biomass trading emulated platform, which considers the decision preference of the farmer, was Build. The platform was used to study the effects of farmers' behavior and transportation costs on the amount of the collected straw. Found that, the farmers' behavior heterogeneous and the transportation cost have huge Influences on the ultimately collected straw amount. Compared with the theoretic collecting amount, there are great differences in the ultimately collected straw amount, …

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Simulation Study For Truck Restriction Strategies On Jingzang Expressway In Beijing, Senyan Yang, Jianping Wu, Mingyu Liu, He Lei Jun 2020

Simulation Study For Truck Restriction Strategies On Jingzang Expressway In Beijing, Senyan Yang, Jianping Wu, Mingyu Liu, He Lei

Journal of System Simulation

Abstract: Lane restriction strategy for trucks is an effective way to improve the capacity of expressways and ease traffic congestion. Microscopic simulation models were employed to assess the impacts of restriction strategies and truck accidents on expressway traffic condition. Parameters were calibrated and validated based on the field data of Jingzang Expressway. Five simulation scenarios with different time setting for trucks' no passing were established, and evacuation after truck accident was simulated. Simulation results indicate that the most suitable time for trucks' no passing is from 7:00 to 19:00. The travel time of small passenger cars can be reduced …

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Brief Technical Analysis Of Malicious Cyber Attacks In Power System, Yan Ru, Minrui Fei, Dajun Du Jun 2020

Brief Technical Analysis Of Malicious Cyber Attacks In Power System, Yan Ru, Minrui Fei, Dajun Du

Journal of System Simulation

Abstract: The power system is responsible for providing electric power to the society. Whether its operation is safe and reliable or not is directly related to the economic livelihood and national security. The malicious cyber-attacks happening on power systems in recent years were summarized, the attack methods used in malicious attack were enumerated, and the complexity and diversity of attack methods were analyzed. The vulnerability of the power system at present was pointed putting forward the corresponding measures to ensure the safe and stable operation of power system. Experimental simulation is designed to analyze the attack methods. The future research …

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Two-Dimensional Parameter Estimation Of Near Field Sources Based On Propagator Method, Caifeng Liang, Pan Jing, Liu Ying, Li Xu Jun 2020

Two-Dimensional Parameter Estimation Of Near Field Sources Based On Propagator Method, Caifeng Liang, Pan Jing, Liu Ying, Li Xu

Journal of System Simulation

Abstract: A new method based on fourth-order cumulant and propagator method for the joint estimation of the range and DOA of spatial near-field sources is presented. The fourth-order cumulant matrix is constructed using the received uniform linear array data, the received signal noise subspace is estimated by propagator method; the range and DOA of spatial near-field sources are gotten through the spectrum peak search method after the MUSIC spectrum function construction. Compared with the traditional MUSIC algorithm, the presented algorithm with the propagator method directly estimates the least squares solution of the noise subspace, rather than conventional orthogonal solution of …

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Accuracy Of New Lattice Monte Carlo Simulation Algorithm Of Biased Diffusion Model, Zhengxiong Wu, Guo Gang, Duan Hong Jun 2020

Accuracy Of New Lattice Monte Carlo Simulation Algorithm Of Biased Diffusion Model, Zhengxiong Wu, Guo Gang, Duan Hong

Journal of System Simulation

Abstract: It is already proved that the traditional fixed time step lattice Monte Carlo (LMC) algorithm can reproduce both the mean and the variance of the particle displacement exactly. However, there is always a non-zero skewness when there is a drift. To further improve the accuracy, a new LMC algorithm of biased diffusion model with five transition probabilities has been devised, which indeed reproduces the first three moments exactly. The valid scope of lattice step and time step can be determined numerically once the drift and the diffusivity are given. A new measurement is introduced to study the accuracy characteristics …

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A Cnn Based Cognitive Method To Battlefields Encompassing Situation With Insufficient Samples, Zhu Feng, Xiaofeng Hu, Xiaoyuan He, Yisi Kong, Yang Lu Jun 2020

A Cnn Based Cognitive Method To Battlefields Encompassing Situation With Insufficient Samples, Zhu Feng, Xiaofeng Hu, Xiaoyuan He, Yisi Kong, Yang Lu

Journal of System Simulation

Abstract: To research the issue of how to grasp the commander's cognitive experience successfully and effectively facing to battlefields sight map, Convolution Neural Network (CNN) as a kind of the typical algorithm in deep learning can provide the key ways. However, CNN needs the enough samples for running. These samples are hardly to achieve for the time being. Aimed at these problems, some exploring researches were carried out. The issues of battlefields encompassing situation cognition met generally in the warfare and lacking enough samples were discussed. On the basis of analyzing the image characteristics of battlefields encompassing situation and the …

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Simulation Of Cooperative Behavior Contagion In Small World Network, Shilong Wang Jun 2020

Simulation Of Cooperative Behavior Contagion In Small World Network, Shilong Wang

Journal of System Simulation

Abstract: Under small world network structure, this research constructed a contagion model of cooperative behavior based on behavioral characteristics such as homogeneity gathering, two degrees of separation, influence paradox, attenuation nature, etc. and used Netlogo platform to run the simulation. The results indicate the contagion of cooperative behavior has hysteresis, emergent and progressive properties; the average path length constrains the contagion completion; the strong ties are prone to spread cooperative behavior; the distribution level of node degree of network significantly impacts the contagion time. The discoveries afford guidance for enhancing cooperation performance in small groups, by adjusting relationship …

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Dynamic Evolvement And Emergence Modeling For Distributed Operational Systems Capability, Yinghui Yang, Jianhua Li, Mingli Nan, Chen Qiang, Jifang Wen Jun 2020

Dynamic Evolvement And Emergence Modeling For Distributed Operational Systems Capability, Yinghui Yang, Jianhua Li, Mingli Nan, Chen Qiang, Jifang Wen

Journal of System Simulation

Abstract: Aiming at dynamic characteristic of battlefield environment, particularity of operational systems, function heterogeneity and nonlinear effect of operational units, a new dynamic evolvement and emergence modeling method for distributed operational systems capability was proposed. Operational systems super-network model composing of unit layer and network & system layer was built based on super-network theory, and relationship between two layers was analyzed. Concepts of unit capability, network & system capability, systematic capability and fire procedure link were defined. Unit to capability mapping relationship and capability to capability relationship were researched respectively. Affects of unit self-effect, units' inter-effect, network promotion and battlefield …

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Robust Control Of Free-Floating Two-Flexible-Link Space Manipulator Based On Observer, Xiaoyan Yu, Chen Li Jun 2020

Robust Control Of Free-Floating Two-Flexible-Link Space Manipulator Based On Observer, Xiaoyan Yu, Chen Li

Journal of System Simulation

Abstract: The joint motion robust control and optimal flexible vibration control of a free-floating two-flexible-link space manipulator based on linear observers was discussed. The dynamic model of a free-floating space manipulator with two flexible links was established by the momentum conservation and the Lagrange equations. Based on singular perturbation approach and choosing appropriate local coordinate frame, a slow subsystem and a flexible-link fast subsystem were obtained. The corresponding controllers were proposed for the two subsystems, which was the linear observer based robust slow subsystem controller and the linear observer based flexible link fast subsystem optimal controller. Numerical simulation demonstrates …

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Research On Force Compliance Of The Hydraulic Control System In Major-Motion Mechanism For Manipulator, Geqiang Li, Jingwei Zhang, Yuesong Li, Bin Zhou, Shuye Ma Jun 2020

Research On Force Compliance Of The Hydraulic Control System In Major-Motion Mechanism For Manipulator, Geqiang Li, Jingwei Zhang, Yuesong Li, Bin Zhou, Shuye Ma

Journal of System Simulation

Abstract: The force compliance method of the hydraulic control system in major-motion mechanism was proposed during the forging process. Taking the major-motion mechanism of the forging manipulator as the target, the inverse kinematics model of major-motion mechanism was established, and the dynamic model of hydraulic control system was built. Through taking the pressure as the controlled variable, the model of the lifting hydraulic control system was obtained by using the co-simulation technology. Based on the principle of the horizontal buffering system, the model of the buffering hydraulic system which was made up of the buffering cylinder and the accumulator …

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In-Cylinder Flow Analysis And Verification Of Opposed-Piston Two-Stroke Engine, Fukang Ma, Changlu Zhao, Zhenfeng Zhao, Wang Hao, Yu Xia, Cao Yan, Jiqing Zhang Jun 2020

In-Cylinder Flow Analysis And Verification Of Opposed-Piston Two-Stroke Engine, Fukang Ma, Changlu Zhao, Zhenfeng Zhao, Wang Hao, Yu Xia, Cao Yan, Jiqing Zhang

Journal of System Simulation

Abstract: The effects of flat piston uniform scavenging chamber, flat piston non-uniform scavenging chamber and pit piston non-uniform scavenging chamber on the in-cylinder flow were analyzed. Uniflow scavenging zero-dimensional model was used to qualitative analysis in-cylinder flow organizational process and influence rule for opposed-piston two-stroke engine. Results show that uniform scavenging chamber can organize swirl and increase scavenging efficiency and non-uniform scavenging chamber can organize tumble and increase turbulent kinetic energy. Scheme 3 is favorable to organize tumble and maintain the in-cylinder turbulence intensity, which is increased by 150 percent.

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Dfig Grid Connection Simulation Method Used For Transient Analysis Of Black-Start, Liqing Liu, Zengqiang Mi, Du Ping, Yuliang Wan, Yuan He Jun 2020

Dfig Grid Connection Simulation Method Used For Transient Analysis Of Black-Start, Liqing Liu, Zengqiang Mi, Du Ping, Yuliang Wan, Yuan He

Journal of System Simulation

Abstract: Establishing a grid connection model of doubly-fed induction generator based wind turbine (DFIG) could be useful in the research and verification of black-start strategy in isolated power grid containing wind power. A DFIG grid connection simulation method based on Simulink was proposed. Through analyzing the operation characteristics of doubly-fed induction generator in no-load and grid-connected conditions, its dual-operation simulation model was established. According to the grid-connection theory of DFIG, the established doubly-fed induction generator model was combined with wind turbine, converter and other built-in modules, and the DFIG grid connection model was built with its control system added. …

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