The proceedings of the 10th Frontier Academic Forum of Electrical Engineering (FAFEE2022): Volume II (Lecture Notes in Electrical Engineering, 1054)

Contents Communication Protocol Optimization of Electric Low Power Wireless Sensor Network Based on Active Wakeup 1 Introduction 2 Active Wakeup of Sensors 3 Communication Protocol Optimization 4 Theoretical Analysis 4.1 Existing Communication Protocol of e-LPWSN 4.2 Optimized Communication Protocol of e-LPWSN 5 Simulation Results 6 Conclusions References Application of Scientific Hypothesis - Deductive Method in Analysis of Abnormal Swing Fluctuation of Hydropower Unit 1 Introduction 2 Analytical Application of the Methodology 2.1 Look for Relevant Factors 2.2 Generation of Hypothesis 2.3 Verification of Hypotheses 3 Conclusion References Optimization of Gear Ratio and Torque Density of Magnetic Gears Based on Genetic Algorithm 1 Introduction 2 MG Configuration 3 Optimize Settings 4 Comparative Analysis 5 Conclusion References Simulation Study for the Influence of Electrical Trees on Electric Field Distribution Around 10 kV Cable Bushing 1 Introduction 2 Finite Element Simulation Model of Cable Bushing 2.1 The Numerical Model 2.2 The Numerical Model 2.3 Model Building and Mesh Generation 3 Influence of Electric Branches on Electric Field Intensity Distribution Around Casing 3.1 Influence of Electric Branches at Different Locations on Electric Field Distribution 3.2 Effects of Different Forms of Electric Branches on Electric Field Distribution 4 Conclusion References Novel Controllable Commutated Converter (CLCC) and Rapid Defense Method for Commutation Failure 1 Introduction 2 Controllable Commutation Converter Topology 3 Parameter Design and Stress Analysis 3.1 Parameter Design of Converter Valve 3.2 Stress Analysis 4 Rapid Detection Method of Commutation Failure 5 Simulation Verification 6 Conclusion References An Uncertainty Analysis Method of Dimension Reduction for Multiconductor Transmission Line 1 Introduction 2 Interval Analysis Method 3 Simplified Modeling Method for Stochastic Wire Bundle 3.1 Wire Bundle Grouping 3.2 Simplified Wire Bundle Geometry Parameters 3.3 Terminal Load is Simplified Model 4 Stochastic Wire Bundle Simulation and Verification 4.1 Error Analysis 4.2 Computing Efficiency 5 Conclusion References Magnetic Field Analysis and Magnetic Resistance Optimization of Moving Magnet Primary Segmented Permanent Magnet Synchronous Linear Motor 1 Introduction 2 The Model of Discontinuous Sectional Primary Linear Motor 3 The Analysis of Air Gap Magnetic Field of Discontinuous Segmented Linear Motor 3.1 Analytical Formula of Air Gap Magnetic Density for Motor Model 3.2 The Comparison of Air Gap Magnetic Density Analysis and Finite Element Method 4 Structure Optimization of SPPMLSM 5 Load Simulation Comparison of Motor Model Before and After Optimization 6 Conclusion References Research on a Design Method of Composite Nano Generator Based on Rotation 1 Introduction 2 Design of Rotary Composite Nano Generator 2.1 Mechanism of Frictional Nano Power Generation 2.2 Structural Design of Composite Nano Generator 2.3 Structural Design of Composite Nano Generator 3 Power Management Circuit Design 3.1 Rectifier Circuit Design 3.2 Charging and Discharging Circuit Design 4 Simulation and Experimental Verification 5 Conclusion References Research and Application of Dry-Type Transformer Winding Material Detection Technology 1 Introduction 2 Thermoelectric Effect Method 2.1 Principle of Thermoelectric Effect 2.2 Detection Method of Thermoelectric Effect of Dry-Type Transformer 2.3 Test Result and Judgment Standard 3 Detection Example of Dry-Type Transformer Thermoelectric Effect Method 3.1 Thermoelectric Effect Detection Method of Winding Material 3.2 Electrical Test Items 3.3 Transformer Temperature Rise and Capacity Verification 3.4 Silicon Steel Sheet and Epoxy Resin Detection 4 Operation and Maintenance Strategy of Aluminum Core Transformer 4.1 Strengthen Dry Operation and Maintenance 4.2 Strengthen the Control of Dry Transformer Access Network 5 Conclusions References Prediction of Dissolved Gas Concentration in Transformer Oil Based on WPD-CSO-LSTM Model 1 Introduction 2 Wavelet Packet Decomposition 3 Long Short-Term Memory 4 Crisscross Optimization Algorithm 5 Network Prediction Model Based on WPD-CSO-LSTM 6 Example Analysis 6.1 Prediction Model Evaluation Index 6.2 Partition of Data Sets 6.3 Data Processing 6.4 Experimental Results and Analysis 6.5 Experimental Results of Other Gas Concentration Prediction 7 Conclusion References Digital Twin Model of Air-Immersed Transformer Based on Electro-Thermal Simulations 1 Introduction 2 DT Modeling Scenario and Parameters 2.1 The Overall Scenario for DT Modeling and Simulation 2.2 The Parameters of the Air-Immersed Transformer 3 Digital Twin Model of Air-Immersed Transformers 3.1 Model Building and Meshing 3.2 Modeling of Electromagnetic Characteristics 3.3 Modeling of the Temperature Characteristics 4 Simulation Analysis 4.1 Electromagnetic Field Simulation 4.2 Temperature Field Simulation 5 Conclusion References Simulation and Lead-In Design of Wall Bushings in Artificial Climate Chamber Under Complex Atmospheric Conditions 1 Introduction 2 Breakdown Voltage Correction and Corona Control Value 2.1 Breakdown Voltage Correction 2.2 Corona Control Value 3 Simulation Settings 4 Design of Installation Position 5 Final Design Scheme Verification 5.1 Breakdown Voltage Correction 5.2 Corona Discharge Verification 5.3 Final Design Scheme 6 Conclusions References Cascade Finite Control Set Model Predictive Control Research for Bearingless Switched Reluctance Motors 1 Introduction 2 Cascade FCS-MPC Algorithm for BSRM 2.1 Prediction Model of BSRM 2.2 BSRM Optimal Voltage Vector Selection 3 Simulation and Analysis of Cascade FCS-MPC Algorithm 4 Conclusion References A Design of Voltage-PDM Type Torque Controller for Dual-Winding BSRM Based on Super-Twisting Algorithm 1 Introduction 2 BSRM Control Principle 2.1 Torque Control Principle 2.2 Suspension Force Control Principle 3 Implementation of Super-Twisting Torque Controller 3.1 Design of Super-Twisting Controller 3.2 Pulse Density Modulation Principle 4 Control Block Diagram 5 Simulation Analysis 6 Conclusions References Harmonic Elimination in Inverter Using Modified GWO Algorithm 1 Introduction 2 Grey Wolf Optimization Algorithm 3 Improved Grey Wolf Optimization Algorithm 3.1 Chaotic Population Initialization 3.2 Improved Nonlinear Convergence Factor 3.3 Position Updating Formula Based on Particle Swarm Optimization 4 Establishment of Five-Level SHEPWM Equations 5 Improved Grey Wolf Algorithm for Solving Nonlinear Equations 6 Simulation and Experimental Verification 6.1 Simulation Study 6.2 Experimental Analysis 7 Conclusions References Design and Application of Non-contact Voltage Acquisition Module for Dry Air Core Reactor 1 Introduction 2 Testing Principle and Testing Equipment 2.1 Architecture of Non-contact Voltage Waveform Acquisition Module 2.2 Construction of Non-contact Voltage Acquisition Module 3 The Non-contact Voltage Acquisition Module Test 3.1 Time Domain Response Speed Test of Sensor 3.2 Response Speed Test of Sensor 4 The Non-contact Voltage Acquisition Module Test 4.1 On Site Switching Test of Test Station 4.2 On Site Switching Overvoltage Test of Substation 5 Conclusion References Experiment and Simulation Study on the Generation Process of Cable Carbonization Path 1 Introduction 2 Analysis of Cable Carbonization Process Based on High-Speed Camera 2.1 Experimental Design 2.2 Analysis of the Carbonization Process 2.3 Carbonization path Generation Mechanism 3 Multi-factor Analysis of Carbonization Path Generation 3.1 Orthogonal Experimental Design 3.2 Range Analysis in Orthogonal Experiments 4 Cable Notch Arc Model Simulation 4.1 Arc Magnetohydrodynamic Equation Set 4.2 Simulation Model 4.3 Simulation Analysis 5 Conclusion References Research on Thermal Runaway Behavior and Early Fire Detection Method of Lithium Battery 1 Introduction 2 Analysis of Thermal Runaway Gas Production Mechanism of Lithium Battery 3 Experimental Design 3.1 Samples of the Battery 3.2 Design of Experimental Apparatus and Methods 4 Study and Analysis of Thermal Runaway Behavior 4.1 Analysis of Heat Production Behavior 4.2 Analysis of Gas Production Behavior 5 Conclusion References Design of an Inductive Charging System Based on PCB-Resonator with Constant Current or Constant Voltage Output 1 Introduction 2 Analysis of PCB-Resonator 2.1 Equivalent Model 2.2 Port Impedance 3 Analysis of IPT System with CC-CV Output 4 Experiment 4.1 Experimental Setup 4.2 CC Mode Experiment Results 4.3 CV Mode Experiment Results 5 Conclusion References Bidirectional Converter-Based Decentralized Compensation Solution for Medium Voltage Networks in Urban Railways 1 Introduction 2 Decentralized Compensation Solution 2.1 Compensation Network Topology 2.2 Compensation Control Method 3 Reactive Power Compensation Strategy 4 Analysis of Reactive Power Compensation Optimization Examples 4.1 Reactive Power Compensation Example 4.2 Comparison of Reactive Power Compensation Effect 5 Conclusion References Design of Polygonal Permanent Magnet Array in Magnetic Nanoparticle Imaging System 1 Introduction 2 Theoretical Basis of Halbach Permanent Magnet Array 3 Design of Permanent Magnet Array Linear Field-Free Line System 4 Analysis of Simulation Results of Different Polygon 5 Conclusions References Fracture Toughness Measurement of GIS/GIL Epoxy Composites Based on Ultrasonic Testing Technology 1 Introduction 2 Experiments 2.1 Epoxy Specimens 2.2 Prefabricated Crack Ultrasonic Testing Platform 2.3 Three-Point Bending Test 3 Results and Analysis 3.1 Ultrasonic Detection of Prefabricated Crack Lengths 3.2 Fracture Toughness Measurement 4 Conclusion References Active Gate Drive for Short-Circuit Current Suppression of SiC MOSFET in Hard Switching Fault 1 Introduction 2 Gate Drive circuit and Parameters design 3 Experiment 4 Conclusion References Analysis and Research on an Equivalent Circuit of LiFePO4 Battery Under a High Discharge Rate 1 Introduction 2 Typical Equivalent Circuit 2.1 First-Order RC circuit 2.2 Second-Order RC circuit 3 Parameter Identification Based on the FFRLS Algorithm 3.1 Algorithm Principle 3.2 Online Identification of First-Order RC Circuit Parameters 3.3 Online Identification of Second-Order RC Circuit Parameters 4 Experimental Validation 4.1 Calibration Experiment of OCV-SOC Function 4.2 Model Parameter Identification Experiment 5 Conclusion References Research on Orderly Charging Scheduling Strategies for Interactive Power Networks Through Cloud-Side-End Collaboration 1 Introduction 2 System Scheduling Strategy 2.1 Orderly Charging Scheduling Strategy Based on Three Elements 2.2 The Characteristics of Detection Flow Data and Control Flow Data 3 System Hardware 3.1 Power Controller Hardware 3.2 Orderly Charging Coordinator Hardware 4 System Software 5 System Test 6 Conclusion References Multi-objective Optimization of Motor Rotor Notches Based on Multi-Objective Particle Swarm Optimization 1 Introduction 2 Analytical Calculation of Electromagnetic Force 3 Optimum Design of Motor Rotor Structure 4 Multi-objective Optimization Algorithm Based on Particle Swarm Optimization 4.1 Multi-objective Optimization and Particle Swarm Optimization Theory 4.2 Multi-objective Optimization Process 4.3 Comparison of Optimization Effects 5 Conclusion References Analysis and Simulation of Electromagnetic Vibration Under Fault-Tolerant Control of Marine Six-Phase Permanent Magnet Synchronous Motor 1 Introduction 2 Analysis of the Structure and Electromagnetic Vibration Mechanism of Six-Phase Permanent Magnet Synchronous Motor 2.1 Modeling of the Motor 2.2 Electromagnetic Vibration Mechanism Analysis 3 Electromagnetic Solutions Under Different Working Conditions 3.1 Motor Excitation Source Setting Under Load 3.2 Motor Excitation Source Setting After Open-Phase 3.3 Motor Excitation Source Setting After Single-Phase Open-Circuit Fault-Tolerant Control 3.4 Excitation Source Setting After Two-Phase Open-Circuit Fault-Tolerant Control 3.5 Comparative Analysis of Radial Electromagnetic Force Finite Element Solution Results 4 Magneto-Solid Interaction Physics Field Simulation 4.1 Stator Core Surface Vibration Response Analysis 5 Conclusions References Research on PWM Rectifier Extending DC Working Voltage Range 1 Introduction 2 Modeling and Control of PWM Rectifier 3 Method Analysis of Broadening DC Side Voltage Range of PWM Rectifier 4 Simulation Analysis 4.1 Constant Voltage Region 4.2 Constant Power Region 4.3 Power Reduction Region 5 Conclusion References Deep Learning + Complex Physics Field Modeling: Illustrated by the Example of Numerical Investigation on Low Temperature Plasma 1 Introduction 2 Methodology 3 Deep Learning for Low Temperature Plasma Simulation 4 Conclusion References Multi-objective Coordinated Charging Strategy for Electric Vehicles Considering Dynamic Time-of-Use Electricity Price 1 Introduction 2 EV Charging Behavior Characteristics and Dynamic Time-of-Use Electricity Price 2.1 The EV Charging Behavior Characteristics 2.2 The EV Charging Behavior Characteristics 3 EVs Coordinated Charging Strategy Model 3.1 EVs Coordinated Charging Strategy 3.2 EVs Coordinated Charging Strategy 4 Genetic Simulated Annealing Particle Swarm Optimization 4.1 The Algorithm Improvement 4.2 The Algorithm Parameter Setting 5 Analysis of Examples 5.1 Optimization Results Under Different Electricity Price Strategies 5.2 Optimization Results for Different Numbers of Vehicles 5.3 Optimization Results Under Different Responsiveness 5.4 Optimization Results Under Different Algorithms 6 Conclusion References Coordinated Control of Commutation Failure Prevention Under UHVDC Multi-infeed System 1 Introduction 2 Structure and Control Strategy of UHVDC Multi-infeed System 2.1 Structure of UHVDC Multi-infeed System 2.2 CFPREV Control Strategy of UHVDC Multi-infeed System 3 The Coordinated Control of CFPREV in UHVDC Multi-infeed System 3.1 The Strategy of Coordinated Control of CFPREV in UHVDC Multi-infeed System 3.2 The Effect of the Coordinated Control on Suppressing Commutation Failure under Symmetric Faults 4 Conclusion References Research on Multi-modal Track Association and Fusion Algorithm in Air Defense Weapon System 1 Introduction 2 Background 3 Multi-modal Track Association and Fusion Algorithm 3.1 Three-Dimensional and Two-Dimensional Track Association Fusion Model Based on Triangle Method 4 Simulation Experiment 5 Conclusion References Harmonic Analysis of Grid-Connected Electric Vehicle Charging Stations 1 Introduction 2 Typical City Electric Vehicle Charging Station 2.1 Classification of EV Charging Stations in Typical Cities 2.2 EV Charger Model 3 The Impact of Urban Charging Station Access on the Harmonics of the Distribution Network 3.1 Harmonic Analysis Model for Urban EVCSs 3.2 Harmonic Analysis of Different Charging Scenarios 4 Conclusion References Two-Tier Demand-Side Response for Hydrogen Producing and Hydrogen Selling Integrated Hydrogenation Station 1 Introduction 2 Two-Tier Demand-Side Response System Structure and Demand-Side Response Mechanism 2.1 Integrated Energy System Structure of the Integrated Hydrogen Production and Hydrogen Refueling Mother Station 2.2 Link Model of Integrated Energy System Structure of Hydrogen Production and Hydrogen Refuelling Integrated Mother Station 2.3 Two-Layer Demand-Side Response Mechanism of the Integrated Hydrogen Production and Hydrogen Refueling Mother Station 3 Two-Tier Demand-Side Response Model 3.1 Objective Function 3.2 Constraints 4 Example Analysis 4.1 Background of the Algorithm 4.2 Feasibility Experiment Results and Analysis 4.3 Analysis of Sensitivity Test Results 5 Conclusion References Visual Defect Detection Method of High Voltage Overhead Transmission Line Based on rp-CenterNet 1 Introduction 2 Directional Adaptive Visual Defect Detection Framework for High-Voltage Overhead Transmission Lines 2.1 Application of Directional Adaptive Target Detection in Transmission Line Defect Detection 2.2 TRANS2021 Dataset 3 Visual Defect Detection of Transmission Equipment Based on rp-CenterNet 3.1 Network Structure 3.2 Equipment Category Prior Check 4 Simulation Experiment and Result Analysis 4.1 Dataset and Experimental Environment 4.2 Analysis of Simulation Results 5 Conclusions References Research of Image Recognition Technology Based on 3D Point Cloud Data in Locomotive Roof Detection 1 Introduction 2 System Design 2.1 System Workflow 2.2 3D Reconstruction of the Roof Image 2.3 Image Recognition Algorithms 2.4 Image Acquisition Module 2.5 Vehicle Number Recognition Module 2.6 Speed Measurement Module 2.7 Control Module 3 System Testing 4 Conclusion References Review of Isolated DC-DC Converter for Wide Voltage Range Regulation 1 Introduction 2 Single-Stage Topology 2.1 Primary Side Modified Resonant Converter 2.2 Transformer Modified Resonant Converter 2.3 Secondary Side Modified Resonant Converter 3 Other Topologies 3.1 Two-Stage Topology 3.2 Quasi-Single-Stage Topology 3.3 LCLC Resonant Converter 4 Topology Summary and Comparison 5 Conclusion References Analysis on the Operating Condition of Electrical Contact Structure Used in Gas Insulated Switchgear 1 Introduction 2 Theoretical Basis 2.1 GIS Busbar Joint Modeling 2.2 Electrical Contact Theory 2.3 Theoretical Basis 2.4 Calculation Method of Thermal Field and Flow Field 3 Simulation and Analysis 4 Conclusion References Multi-objective Optimization and Research of the New Type Combined Excitation Permanent Magnet Motor for Electric Vehicle 1 Introduction 2 Motor Topology Analysis 3 Motor Parameter Optimization 3.1 Optimization Goals and Parameters 3.2 Sensitivity Analysis 3.3 High-Sensitivity Parameters Optimization 3.4 Low-Sensitivity Parameters Optimization 4 Performance Comparison 4.1 CEPMM Structure Parameters 4.2 Analysis of No-Load Condition 4.3 Analysis of Electromagnetic Torque 4.4 Analysis of Efficiency 4.5 Analysis of Demagnetization 5 Experiment Verification 6 Conclusion References Sensorless Control of Multiphase Permanent Magnet Synchronous Motor Considering Phase-to-Phase Coupling 1 Introduction 2 Mathematical Model of Twelve-Phase PMSM 2.1 Mathematical Model in abc Coordinate System 2.2 Mathematical Model in αβ0 Coordinate System 3 Rotor Flux Observation Method Considering Phase-to-Phase Coupling 4 Rotor Position and Speed Observation Based on PLL 5 Simulation Verification 5.1 Simulation of Typical Load Conditions 5.2 Comparative Analysis 6 Conclusion Appendix References Analysis of Electromagnetic Loops Opening Scheme Based on Penalty Variable Weight Optimal Comprehensive Evaluation Model 1 Introduction 2 Operation Index of Opening Scheme 2.1 Subsection Sample Flow Distribution Index 2.2 Grid Security Indicators 2.3 Short Circuit Current Index 2.4 Section Transmission Power Limit Index 2.5 Sending and Receiving End Power and Power Balance Indicators 3 Optimal Comprehensive Evaluation Model of Penalty Variable Weight 3.1 Inverse Quotient Transform and De-dimensioning 3.2 Constant Weight Optimal Comprehensive Evaluation 3.3 Optimal Comprehensive Evaluation Model of Penalty Variable Weight 4 Case Analysis 4.1 Introduction to Shaanxi Power Grid 4.2 Simulation Analysis of Power Grid Decoupling Scheme 5 Epilogue References Application and Development of Active Distribution Grid Technology for Integrated Energy Systems in the Context of Industrial Internet 1 Introduction 2 Typical Model of Active Distribution Network of Integrated Energy System in the Context of Industrial Internet 3 Typical Model of Active Distribution Network of Integrated Energy System in the Context of Industrial Internet 4 The Development Path of Active Distribution Network of Integrated Energy System in the Context of Industrial Internet 5 Conclusion References Development of LDV-Based Length Measuring Equipment for Tension Stranding Construction Conductor 1 Introduction 2 Functional Requirements of Tension Wire Length Measuring Equipment 2.1 Tension Wire Construction Features 2.2 Tension Wire Construction Features 3 Establishment of Non-Contact Length Measurement Model 4 Development of Wire Length Measuring Equipment 4.1 Overall Structure Scheme of Length Measuring Equipment 4.2 Hardware Structure Design of Length Measuring System 4.3 System Software Programming 5 Engineering Applications 6 Conclusion References Achieving High Dielectric Constant, High Breakdown Strength, and High Efficiency in a Linear Polymethyl Methacrylate Composite for Energy Storage 1 Introduction 2 Experimental 2.1 Materials 2.2 Preparation of the PMMA Composite Films 2.3 Characterization 3 Results and Discussion 4 Conclusion References Thermal Circuit Model of Oil-Immersed Distribution Transformer in Unbalanced Operation 1 Introduction 2 The Thermal Circuit Model of Transformer in Unbalanced Operation 3 The Calculation Method of Model Parameters 3.1 The Losses 3.2 The Thermal Capacitance 3.3 The Thermal Resistances 4 The Thermal Resistance Calculation 4.1 The Unbalanced Temperature Rise Test 4.2 The Parameters Calculation Results 5 The Variation Law of Thermal Resistances 5.1 The Nonlinearity Exponent of Thermal Resistances 5.2 The Thermal Resistance Coefficient 5.3 Verification 6 Conclusion References Improved Transformer Fault Diagnosis Method Based on Sparrow Search Algorithm-Optimized BP Network and Duval Pentagon 1 Introduction 2 Duval Pentagon Method 3 Sparrow Search Algorithm to Optimize BP Neural Network 3.1 Sparrow Search Algorithm 3.2 BP Neural Network 4 Improved Fault Diagnosis Model Based on Duval's Pentagonal Method and SSA-BP 5 Conclusion References An Improved Low Voltage Ride Through Strategy for Wind Turbines Connected to the Weak Grid 1 Introduction 2 System Modeling and Control 2.1 Low Voltage Ride Through Weak Grid 2.2 Control of System 3 LVRT Current Control Strategy 3.1 Current Limiting Strategy 3.2 Traditional Method 3.3 The Proposed Method 4 Simulation Verification 4.1 Simulation Parameters 4.2 Simulation Results and Analysis 5 Conclusion References Optimal Planning of Power-to-Hydrogen Unit Considering Electrical-Thermal Coupling in Power System with Offshore Wind 1 Introduction 2 Planning Model of Power-to-Hydrogen Unit Considering Electrical-Thermal Coupling 2.1 Electrical-Thermal Coupling Model of PtH Unit 2.2 Planning Model of Power System with PtH Units 2.3 Model Linearization 3 Case Study 3.1 System Description 4 Influence of PtH Units on Offshore Wind Integration 5 Sensitivity Analysis 6 Conclusion References Research and Application on Ferroresonance Suppression Effect of 6~35 kV Potential Transformer Current - Sensitive Harmonic - Free Device 1 Introduction 2 Principle and Characteristics of PT Ferromagnetic Resonance Overvoltage 2.1 Harm of Ferromagnetic Resonance Overvoltage in Distribution Network 2.2 PT Ferromagnetic Resonance Overvoltage Principle 2.3 Characteristics of Ferromagnetic Resonance in PT Circuit 3 Research and Analysis on Treatment Measures of Ferromagnetic Resonance 3.1 Change the Resonance Parameters 3.2 Increase System Damping 4 Flow-Sensitive Intelligent Harmonic Elimination Management Technology 4.1 The Working Principle of the Flow-Sensitive Harmonic Elimination Device 4.2 Simulation 5 Flow-Sensitive Intelligent Harmonic Elimination Management Technology 6 Conclusion References Delta Measurement Analysis Method Applicable to All-Parallel AT Traction Network of High Speed Railway 1 Introduction 2 Fault Current Analysis 3 Delta Measurement Analysis 4 Simulation Validation 5 Conclusion References Analysis and Research of Networked Traction Power Supply System 1 Introduction 2 Networked Traction Power Supply System 2.1 System Structure 2.2 System Operation Principle 3 The Working Principle of PET 3.1 Basic Structure of PET 3.2 Control Strategy for PET 4 Simulation Model Analysis 4.1 Simulation Model 4.2 System Performance Analysis 5 Conclusion References Propagation Characteristics of High-Frequency Partial Discharge Current in Gas Insulated Equipment 1 Introduction 2 Equivalent Circuit Analysis and Parameters Calculation 2.1 Equivalent Circuit Analysis 2.2 Distribution Parameters Calculation 3 Simulation of High-Frequency Current Propagation Characteristics 3.1 Simulation Model of High-Frequency Current 3.2 Simulation Model of Gasinsulated Equipment 4 Simulation Results 4.1 Effect of Distance on High-Frequency Current Propagation 4.2 Effect of Frequency on High-Frequency Current Propagation 4.3 Effect of Discharge Position High-Frequency Current Propagation 5 Conclusion References Research on the Motion Behavior and Discharge Characteristics of Spherical Metal Particles in DC GIS 1 Introduction 2 The Analysis of Force and Charging Mechanism of Particles 3 Simulation of Metal Particle Motion in Coaxial Cylindrical Electrodes 4 Experimental Analysis of Metal Particle Motion Behavior and Discharge Characteristics 4.1 Test Platform 4.2 Motion Behavior and Discharge Characteristics of Single Particles 4.3 Effect of Particle Size 4.4 Effect of Different Numbers of Particles 5 Conclusion References A Comparison Study of Nonlinear Solvers in Transient Circuit Analysis Involving Power Diodes 1 Introduction 2 Formulations 2.1 Behavior-Based Model of Diodes 2.2 Time Discretization of a Reference Problem 2.3 Fixed-Point and Newton-Type Nonlinear Solvers 3 Numerical Results and Discussions 4 Conclusions References Application of VMD-Based Electromagnetic Railgun Launch Current Feature Extraction in the Measurement of Muzzle-Leaving Time 1 Introduction 2 Launch Current Analysis 2.1 Circuit Principle of Pulse Power Supply 2.2 Launch Current and Armature-Rail Contact State 3 VMD Algorithm 3.1 Variational Mode Construction 3.2 Solution of Variational Problems 4 Test and Data Analysis 5 Discussion 6 Conclusion References K-Means Based Multi-dimensional Charging Behavior Profiling Technique 1 Introduction 2 User Charging Behavior Data Analysis 2.1 Abnormal Data Cleaning 2.2 Feature Selection 2.3 Data Standardization 3 Multi-dimensional User Profiling Technology 3.1 RFM Model 3.2 K-Means Clustering 3.3 Analysis of Clustering Results 4 Conclusion References Turn-to-Turn Overvoltage Test Technology for Dry-Type Smoothing Reactor 1 Introduction 2 Basic Principle 2.1 Standard Recommended Dry Reactor Turn-to-Turn Overvoltage Test Circuits 2.2 High Frequency Decay Oscillation Voltage Test Circuit 3 Simulation Verification 3.1 Principle of High Frequency Decay Oscillation Test 3.2 Analysis of Simulation Results 4 Conclusion References Research on Target User Optimal Complex Path Technology for Regional Fault Scenario 1 Introduction 2 Data Characteristics 2.1 Establish Target User Data Characteristics 2.2 Establish Relationship with Bus Line Group 2.3 Establish Regional Fault Characteristics 3 Analysis of Power Restoration Path 3.1 Conventional Power Restoration Path 3.2 Unconventional Power Restoration Path 3.3 Analysis of Optimal Power Restoration Path 4 Example 5 Conclusion References A Novel Design Method of Motor Speed Controller Based on Convex Optimization 1 Introduction 2 Basics of Speed Controller Design 2.1 Basic Mathematic Model of Speed Control System 2.2 Selection of Controller Index 3 Design and Analysis of Classic Speed Controllers 3.1 PI Controller 3.2 DOB Controller 4 Speed Controller Design Based on Convex Optimization 4.1 Parametrization of General Linear Controllers 4.2 Design Process of Linear Speed Controller 4.3 Performance Analysis of COB controller 5 Simulation Verification 6 Conclusion References Fire Extinguishing Effect of Reignition Inhibitor on Lithium Iron Phosphate Storage Battery Module 1 Introduction 2 Experimental Sample and Method 2.1 Experimental Sample 2.2 Experimental Device 2.3 Experimental Method 3 Results and Discussion 3.1 Analysis of Battery Burning Phenomenon 4 Conclusion References A Power Decoupling Strategy for Three-Phase Inverter Based on Mid-Leg Fundamental-Frequency Common-Mode Voltage Injection Under Unbalanced Conditions 1 Introduction 2 Methods 3 Control Strategy and simulation verification 4 Conclusion References Terminal Sliding Mode Control of Permanent Magnet Motor Considering Saturation Effect 1 Introduction 2 Methods 2.1 Analysis of Nonlinear Effects of Permanent Magnet Motors 2.2 Consider the Mathematical Model of Nonlinear Permanent Magnet Motor 3 Designing Improved Terminal Slide Controllers 4 Simulation Analysis 5 Conclusion References An Equivalent Transformer Capacitance Model Analysis Method for CM Noise Conduction 1 Introduction 2 Transformer Winding capacitance Model 3 Transformer EMI Character with Different Topology 4 Experimental Verification 5 Conclusions References Virtual Screening of New High Voltage Insulating Gases as Potential Candidates for SF6 Replacement 1 Introduction 2 Methods 2.1 Estimation of Boiling Points 2.2 Estimation of Dielectric Strength 2.3 Filtering of Other Relevant Properties 2.4 Estimation of GWP 3 Results and Discussion 3.1 The Virtual Screening Protocol Is Able to Enrich Compounds with High Dielectric Strengths and Low Boiling Points 3.2 The Virtual Screening Protocol is Able to Enrich Compounds with Diverse Structures 3.3 Optimization of the Virtual Screening 4 Conclusion References Prediction of Global Warming Potential of Insulating Gases Using Random Forest Classifiers 1 Introduction 2 Methods 2.1 Compiling of the Dataset 2.2 Calculations of the Descriptors 2.3 Random Forest Classification 2.4 Performance of the Model 3 Results and Discussion 3.1 Datasets 3.2 Calculations of the Descriptors 3.3 Training and Verification of the Model 3.4 Analysis of Structure-GWP Relationship 4 Conclusions References Analysis of an Internal Fault of Main Transformer 1 Introduction 2 Defect Description 3 Equipment Information and Protection Action 3.1 Equipment Information 3.2 Protective Action 4 On-Site Inspection and Test 4.1 On-Site Inspection 4.2 Oil Chromatography Test 4.3 Electrical Test 5 Toggle Switch Inspection Power Failure Test 6 Internal Inspection of Oil Discharge and Disassembly Ins