The proceedings of the 16th Annual Conference of China Electrotechnical Society: Volume III

Description

This book gathers outstanding papers presented at the 16th Annual Conference of China Electrotechnical Society, organized by China Electrotechnical Society (CES), held in Beijing, China, from September 24 to 26, 2021. It covers topics such as electrical technology, power systems, electromagnetic emission technology, and electrical equipment. It introduces the innovative solutions that combine ideas from multiple disciplines. The book is very much helpful and useful for the researchers, engineers, practitioners, research students, and interested readers. Contents Coordination Control Strategy for a Dual T-Type Modular Multilevel Converter 1 Introduction 2 T-type AC-AC Power Supply Topology 3 Closed Loop Control System Design 4 Circuit Parameter Design 5 Simulation Results 6 Conclusion References High Frequency High Power Soft Switch Resonance Type Based on SiC Design of DC Converter Parameters 1 Introduction 2 LLC Topology Analysis 3 Circuit Parameter Design 3.1 Fundamental Wave Analysis 3.2 ZVS Condition Analysis on Primary Side of Switch Tube 3.3 Parameter Design 4 Design Example 5 Experimental Verification 6 Conclusion References Decentralized Trading of High-Proportion Renewable Energy Microgrid Based on Master-Slave Game and Slime Mould Algorithm (SMA) 1 Introduction 2 Microgrid Electricity Market Pricing 2.1 Microgrid Decentralized Transaction 2.2 Master-Slave Game of Microgrid 3 Slime Mould Algorithm 4 Case Analysis 5 Conclusion References Application and Analysis of LADRC in Photovoltaic Grid-Connection 1 Introduction 2 Model Analysis 3 LADRC Strategy 4 Frequency Domain Analysis 5 Simulation and Analysis 6 Conclusion References Analysis of the Second Kinds of Edge End Effects in Medium and Low Speed Maglev Linear Motors 1 Introduction 2 Basic Structure of Linear Induction Motor 3 Classification and Analytical Formula of Edge End Effect 4 Comparison Between Analytical Method and Measured Value 5 Comparative Analysis of Calculated and Measured Thrust Values 6 Conclusion References Analysis of the Effect of Lightning on the Insulation Between Terminals of Capacitors for EHVDC 1 Foreword 2 Analysis of the Influence of the Lightning Wave on the Capacitor from the View of Traveling Wave 2.1 The Influence of Lightning Wave on the Insulation Between the Capacitor and the Terminals of the Capacitor Group 2.2 Analysis of Resonance Possibility of Lightning Wave in Capacitor Bank 2.3 Analysis of the Influence of Lightning Wave on Capacitor from Wave Impedance 3 Brief Summary References Simulation Research on Electrostatic Distribution of Aircraft Composite Fuel Tank 1 Introduction 2 Fundamental Theory 3 Finite Element Model of Composite Fuel Tank 3.1 Design of Composite Fuel Tank Model 3.2 Model Material Parameter Setting 3.3 Mesh Settings 4 Analysis of the Electrostatic Characteristics and Mechanism of the Outer Skin Model 4.1 Effect of Electrical Conductivity of Single-Layer Composites on Electrostatic Charge Dissipation Process 4.2 The Influence of the Conductivity of Single-Layer Composites on the Distribution of Static Electricity 4.3 The Influence of the Conductivity of Multi-layer Composites 5 Electrostatic Characteristics and Mechanism Analysis of Composite Fuel Tank Model 5.1 Effect of Fuel Quantity on Charge Distribution 5.2 Influence of Laying ECF on Electrostatic Distribution of Outer Skin 6 Conclusion References Ultra-short-Term PV Power Generation Prediction Based on Gated Recurrent Unit Neural Network 1 Introduction 2 Data Preparation 2.1 Data Analysis 2.2 Outlier Handling 2.3 Eigenvalue Digitization 2.4 Normalization 3 Method 3.1 Problem Description 3.2 Ultra-short-Term Photovoltaic Power Generation Forecasting Method Based on GRU Neural Network 3.3 Loss Function 3.4 Method Flow 4 Experiment 4.1 Experiment Settings 4.2 Evaluation Metrics 4.3 Experimental Results and Analysis 5 Conclusion References An Indirect Prediction Method for Wind Power Ramp Events via Similar Sample Clusters 1 Introduction 2 Method 2.1 Similarity Sample Cluster 2.2 Wind Power Ramp-Up Prediction Based on Similar Sample Clusters 3 Analysis and Results 4 Conclusion References Comprehensive Evaluation of Grid Connected Performance of Photovoltaic Power Station Based on Principal Component Analysis and Information Entropy 1 Introduction 2 Comprehensive Evaluation of Grid Connection Performance Based on Principal Component Analysis and Information Entropy 2.1 Grid Connection Performance Index System of Photovoltaic Power Station 2.2 Standardization of Raw Data 2.3 Calculate Correlation Coefficient Matrix 2.4 Calculate Correlation Coefficient Matrix 2.5 Weight Calculation 2.6 Comprehensive Evaluation Model 3 Example Analysis 4 Conclusion References Optimization of Direct Torque Control Strategy for Permanent Magnet Synchronous Motor 1 Introduction 2 Traditional PMSM Direct Torque Control 2.1 PMSM Mathematical Model 2.2 Traditional 6 Sector PMSM Direct Torque Control Method 3 Improved PMSM Direct Torque Control 3.1 Hysteresis Controller Improvement 3.2 Voltage Vector Switching Point Calculation 3.3 Stator Flux Sector Improvement 4 Simulation Results and Analysis 5 Conclusion References Study on Voltage Sharing Characteristics of Composite Insulator Runway Ring for 500 kV Four-Circuit Transmission Lines 1 Introduction 2 Calculation Model and Initial Results 3 Optimization of LRR Parameters 3.1 H Single Value Optimization 3.2 L and W Combination Parameter Optimization 3.3 Φ and Rr Combination Parameter Optimization 4 Comparison of Optimization Results 5 Conclusion References Simulation Research on Environment-Friendly CF3I/CO2Mixed Gas Discharge in Uniform Field 1 The Introduction 2 Gas Discharge Model 2.1 Mathematical Model 2.2 Particle Collision Model Between Plates 2.3 Simulation Model and Boundary Conditions 3 Analysis of Simulation Results 3.1 Analysis of Plasma Formation Process 3.2 Comparative Analysis with SF6 4 Conclusion References Residential Electricity Consumption Behavior Analysis and Intelligent Demand Response Strategy 1 Introduction 2 Electricity Consumption Behavior of Residents 3 Intelligent Demand Response Strategy 4 Case Study 5 Conclusion References Direct Current Voltage Prediction Control Method Based on the Rate of Load Current 1 Introduction 2 Calculation Method of Load Current Change Rate 3 Predictive Control Method 4 MATLAB Simulation 5 Experimental Verification 6 Conclusion References Study on the Inefficiency of Transmission Lines Under the Condition of Severe Ice Wind 1 Introduction 2 The Establishment of the Load Model 2.1 Ice Load 2.2 Wind Load 2.3 Combined Load 3 Stress-Strength Interference Theory 4 The Joint Distribution Function and Inefficiency of the Transmission Lines 5 Case Study 6 Conclusion References Research on Parameter Identification of Lithium Battery Equivalent Circuit Model Based on Recursive Gradient Correction Algorithm 1 Introduction 2 Lithium Battery Equivalent Circuit 3 Model Parameter Identification 4 RGC-PF Algorithm 5 Experiment and Discussion 6 Conclusion References Research on Capacity Configuration of On-Board and Wayside Coordinated Energy Storage System Based on Urban Rail Transit 1 Introduction 2 On-Board and Wayside Coordinated Control ESS 3 Energy Storage System Capacity Configuration Optimization 3.1 Non-dominated Sorting Genetic Algorithm with Elite Strategy 3.2 Capacity Configuration Optimization Model 4 Case Analysis 5 Conclusion References Flexible AC Traction Converter Control Based on Active Disturbance Rejection Control 1 Introduction 2 Flexible AC Traction Power System and Converters 2.1 Flexible AC Traction Power System 2.2 Model of Flexible AC Traction Converters 3 ADRC of Flexible AC Traction Converters 3.1 Theory of ADRC 3.2 Controller Design of Flexible AC Traction Converters 4 Case Study 5 Conclusion Appendix References Review on Space Charge of Polypropylene Laminated Paper 1 Introduction 2 Structure of PPLP 3 Study on Space Charge of PPLP 3.1 Space Charge Distribution in PP Thin Films 3.2 Space Charge Distribution in PPLP 3.3 Effect of Water Content 3.4 Electric Field Distribution 4 Conclusion and Prospect References Comparative Study on Equivalent Circuit Model Parameters of EIS of Retired Lithium-Ion Power Batteries 1 Introduction 2 Equivalent Circuit Model of EIS for Lithium Batteries 3 Experimental Study on EIS Under Different Charged and Aging States 4 Comparative Analysis of Equivalent Circuit Models 4.1 Comparison of Fitting Results of Equivalent Circuit Model 4.2 Grey Slope Correlation Analysis 5 Conclusion References Design and Analysis of Key Parameters for Dual-Stator Switched Reluctance Motor 1 Introduction 2 Model of Dual-Stator SRM 3 Sensitivity Analysis of Main Parameters 4 Design Scheme and Analysis of Motor Polar Structure 5 Conclusion References Study on Arc Root Transfer Phenomenon of Molded Case Circuit Breaker and Its Influence on Arc Extinguishing Ability 1 Introduction 2 Simulation Model of MCCB 2.1 Geometric Model of Grid Arc Extinguishing Chamber 2.2 Model Assumptions 2.3 MHD Mathematical Model 3 Simulation Results and Analysis 3.1 Arc Dynamic Process Under Different Magnetic Fields 3.2 Mechanism Analysis of Arc Root Transfer 4 Conclusion References Optimal Design of Reactor for 12 Pulse Three-Level Rectifier 1 Introduction 2 Analysis of DC Side Current Characteristics of 12 Pulse Rectifier 3 Optimal Design of Reactor 3.1 Discrete Reactor Filtering Scheme 3.2 Common Model Integrated Reactor Filtering Scheme 3.3 Differential Mode Integrated Reactor Filtering Scheme 4 Design Example and Experimental Verification 5 Conclusion References Numerical Simulation of the Railgun Muzzle Ablation Characteristics by Breakdown Arc 1 Introduction 2 Geometric Model 3 Calculation Model and Boundary Conditions 3.1 MDH Model 3.2 Wall Heat Flux Equation 4 Simulation Results and Analysis 5 Conclusion References Simulation Analysis of Partial Discharge Characteristics of Insulators Based on Finite Element Model 1 Introduction 2 Simulation Model 3 Partial Discharge Mechanism and Parameter Setting 3.1 Analysis of Partial Discharge Mechanism 3.2 Parameter Setting and Simulation Flow 4 Simulation Analysis 4.1 Simulation of Discharge Charge Under Different Conductivity 4.2 Electric Field Distribution Before and After Localized Discharge 4.3 Simulation Analysis of Multiple Partial Discharges 4.4 Effect of External Voltage on Partial Discharge Characteristics 5 Conclusion References Improved PID Control Strategy for Speed Loop of High Performance AC Servo System and Its Application 1 Introduction 2 IP Control 3 Two Degree of Freedom Control (TDOF) 4 PI + DOB Observer 5 Technical Analysis of Mainstream Servo Products 6 Conclusion References Development and Application of the Intelligent Protection Platen Remote Controlling Device 1 Introduction 2 Overall System Architecture 3 Design of the Intelligent Device for Protection Platen 3.1 Overall Design 3.2 Automatic Operating Mechanism 3.3 State Sensing Auxiliary Circuit 3.4 Intelligent Control Unit 4 Overall System Architecture 5 Experimental Verification 5.1 Function Verification Test 5.2 Reliability Test 5.3 More Tests 6 Conclusion References Research on Two Rules Assessment and Review System for Predicted Power of New Energy Power Plants 1 Introduction 1.1 Northwest Regional Grid 2018 Edition Two Rules New Energy Plant Algorithm Analysis 1.2 North China Regional Grid 2019 Edition Two Rules New Energy Plant Algorithm Analysis 1.3 Southern Regional Grid 2017 Edition Two Rules New Energy Plant Algorithm Analysis 2 Overview of the “Two Rules” Verify System 2.1 Software Module Design 2.2 Software Module Framework Diagram 3 Application Outlook 4 Conclusion References Electric Field Calculation of Transcranial Magnetic Stimulation After Epilepsy Surgery 1 Introduction 2 Geometry Model 2.1 Data Acquisition and 3D Reconstruction 2.2 Head Tissue Electrical Parameters 2.3 Stimulation Target Area 2.4 Coil Position 3 Induction Electric Field Calculation 3.1 Coil Shape 3.2 Stimulation Current 3.3 Magnetic Vector Potential Calculation 3.4 Induction Electric Field Calculation 4 Result 4.1 Magnetic Vector Potential Calculation 4.2 The Target Induction Electric Field Before and After Surgery 4.3 Effect of Changing Coil Direction on Intracranial Induction Electric Field 5 Conclusion References Design of Agricultural Park Monitoring System Based on FameView 1 Introduction 2 About FameView 2.1 Overview of FameView 2.2 Configuration Software Architecture of FameView 2.3 Summary 3 Brief Introduction of Photovoltaic Greenhouse 3.1 Overview of Photovoltaic Greenhouse 3.2 Configuration of Intelligent Electricity Meter in Greenhouse 3.3 Summary 4 Design of FameView Monitoring System 4.1 Bottom Layer Acquisition 4.2 Data Interaction 4.3 Monitoring Screen Design 4.4 Summary 4.5 Summary 5 Conclusion References Research on Working State Setting and State Adjustment of Brushless Direct Current Motor 1 Introduction 2 Composition of Brushless Direct Current Motor System 3 Calculation and Analysis of PWM Parameters of Brushless Direct Current Motor 3.1 Analysis of the Specific State of the Motor in the Normal Rotation Process 3.2 Calculation and Analysis of Motor Driving Power 4 Parameter Analysis and Working State Adjustment for Motor Rotation States 4.1 The Situation that Motor Power is Not Large Enough to Move the Load 4.2 The Situation that the Motor Power is Large Enough to Drive the Load 5 Practical Application Test 6 Conclusions References Analysis on Switching Signals in Distribution Network 1 Introduction 2 Network Model Analysis of Switching Signal of Electric Equipment 2.1 The Framework of Electric Equipment 2.2 Electrical Signal Equivalent Model of Switching On and Off of Electric Equipment 2.3 Switching Step Shock Response Model of Electric Equipment 3 Position and Distance Estimation of Electric Equipment 4 System Test and Analysis 5 Analysis of Experimental Data 6 Conclusions References Research and Discussion on Measurement Technology Architecture of Smart Substation 1 Introduction 2 Technical Status 2.1 Measurement and Control Device 2.2 Synchronous Phasor Measurement [15, 16] 2.3 Power Quality Monitoring 2.4 Electricity Metering 2.5 Broadband Measurement 3 Comparison and Analysis of Measurement Systems 3.1 Comparison of Main Functions [20–25] 3.2 Key Technical Indicators 3.3 Comprehensive Analysis 4 Integrated Application Scheme 5 Conclusion References Fault Diagnosis Technology of Low Voltage Circuit Breaker Based on Multilayer Perceptron 1 Introduction 2 Circuit Breaker Fault Signal Acquisition 3 Entropy Extraction of Vibration Signal Features 3.1 Information Entropy Theory 3.2 Feature Entropy Calculation 3.3 Feature Entropy Fusion 4 Fault Diagnosis Based on Multi-layer Perceptron 4.1 MLP Network Structure 4.2 MLP Model Parameter Selection 4.3 Analysis and Assessment of Diagnostic Results 5 Conclusion References Optimization Design of Remanufacturing Line-Starting Permanent Magnet Synchronous Motor Based on Ant Colony Algorithm 1 Introduction 2 Model of Remanufacturing Motor 3 Optimal Design 3.1 Optimization Goals 3.2 Optimization Variables 3.3 Restrictions 3.4 Optimization Steps 4 Simulation and Test Results 5 Conclusion References A Method of Coordinated Automatic Backup Power Switch-In Equipment Based on Hot Standby Power Line 1 Introduction 2 Cause Analysis of Substation C Adopting CABPSE 3 Control Logic of CABPSE 3.1 Action Logic of CABPSE in Substation C 3.2 Action Logic of CABPSE in Substation A 3.3 Measures to Prevent Over-Voltage in Substation C 4 Setting Scheme of CABPSE 5 Analysis of Implementing Effects 5.1 Preparation Phrase 5.2 Action Process and Outcomes of CABPSE 6 Conclusion References The Design of High Frequency LLC Switching Power Supply Based on GaN Device 1 Introduction 2 Research Strategy and Design 2.1 Circuit Structure and Principle 2.2 Design and Analysis 2.3 Transformer Design 2.4 Synchronous Rectifier Module 3 Experimental Results 4 Conclusion References Research on Gap Breakdown Process of Circuit Breaker Under Double Lightning Overvoltage 1 Introduction 2 Mathematical Model of Switching Arc 2.1 Calculation Model of Airflow Field 2.2 Calculation Model of Electric Field 3 Arc Characteristics Under Lightning Impulse 3.1 Temperature Distribution Characteristics Under Double Lightning Impulse Current 3.2 Distribution Characteristics of Airflow Field Under Double Lightning Impulse Current 4 Improvement Scheme of SF6 Circuit Breaker Considering Double Lightning Overvoltage 4.1 Influence of Contact Shape on Arc Discharge Suppression 4.2 Influence of Lightning Current Interval on Arc Development 5 Conclusions References A Bridgeless PFC Control Strategy for TCM Based on Drain-Source Voltage Detection 1 Introduction 2 Bridgeless PFC Modal Analysis 3 Control Strategy 3.1 Inductive Current Analysis 3.2 Overcurrent Limit 4 Simulation Experimental Analysis 4.1 Simulation Model Building 4.2 Bridgeless PFC Simulation Analysis 5 Conclusion References Design of UHF Sensor Antenna for Partial Discharge Detection of Distribution Network Switchgear 1 Introduction 2 Archimedes Spiral Antenna Design 2.1 Archimedes Spiral Antenna Parameters 2.2 Archimedes Spiral Antenna Structure 2.3 Improved Planar Archimedes Spiral Antenna Design 2.4 Barron Design 3 Improved Performance Parameters of Planar Archimedes Spiral Antenna 4 Experimental Verification 5 In Conclusion References Structural Design and Multifunctional Application of Wind Storage Frequency Modulation System 1 Introduction 2 Typical Wind Storage Structure Model 3 Design of ES Embedded Fan Structure Model 3.1 ES Selection 3.2 Safety Inspection 4 Multi-functional Control Strategy of ES 5 Simulation Analysis 5.1 Simulation Parameters 5.2 Load Step Disturbance at the Moderate Wind Speed 5.3 Smoothing Function of ES 6 Conclusions References Research on Transformer Protection Configuration Suitable for Korean Power Grid 1 Overall Configuration Program 1.1 The Differential Protection 1.2 Overvoltage Protection 2 Test Verification 2.1 No-Load Closing Under Internal Fault 2.2 CT Saturation 3 Conclusion References Grid-Connected Design of Full-Bridge Three-Level Inverter Based on Improved Finite Control Set Model Predictive Control 1 Introduction 2 Full Bridge Three-Level Inverter 2.1 Working Principle of Full Bridge Three-Level Inverter 2.2 Midpoint Potential Control Strategy for Full Bridge Three-Level Inverter 3 Design Based on FCS-MPC 4 The Improvement of the FCS-MPC 5 Simulation and Experimental Analysis 6 Conclusion References Optimized Control of DCM LCC Resonant Converter for Repetitive Transcranial Magnetic Stimulation 1 Introduction 2 Analysis of TMS Based on LCC Resonance 2.1 Analysis of TMS Discharge Based on LCC Resonance 2.2 Analysis of TMS Charge Based on LCC Resonance 3 Optimization of LCC Resonant Constant Power Control Strategy 4 Simulation and Experiment Verification 4.1 Simulation Verification 4.2 Experiment Verification 5 Conclusion References Model Prediction Control with Common Mode Voltage Suppression for Dual Three-Phase PMSM 1 Introduction 2 Dual-Three Phase PMSM Model and Common Mode Voltage Analysis 2.1 Dual-Three Phase PMSM Model Analysis 2.2 Dual-Three Phase PMSM CMV Analysis 3 MPC Strategy of CMV Suppression 4 CMV Suppression of MPC with Virtual Vector 4.1 The Construction of Virtual Vector 4.2 Simplified Cost Function and Prediction Model 4.3 Estimation of Duty Cycle of V3s 4.4 Vector Sequence Design 4.5 Proposed SCMV-MPCC Method 5 Simulation 6 Conclusion References Summary of Transformer Winding Deformation Detection and Monitoring Methods 1 Introduction 2 Off-Line Detection Method of Transformer Winding Deformation 2.1 Low-Voltage Pulse Method 2.2 Frequency Response Analysis Method 2.3 Short-Circuit Impedance Method 2.4 Sweep Frequency Impedance Method 3 On-Line Monitoring Method of Transformer Winding Deformation 3.1 On-Line Monitoring Method of Transformer Winding Deformation Based on Vibration Signal 3.2 On-Line Monitoring Method of Transformer Winding Deformation Based on Parameter Identification 3.3 Other On-Line Monitoring Methods for Transformer Winding Deformation 4 Conclusion and Outlook References Analog Circuit Implementation of Quasi-Proportional Controller for High-Frequency AC Inverter 1 Introduction 2 Quasi-Proportional Resonance Control 2.1 Proportional Resonance Control 2.2 Quasi-Proportional Resonance Control 3 The Realization of the Analog Circuit of the QPR Controller 4 Simulink Simulation 5 Conclusion References Research on Two Compensation Topologies of Wireless Electric Vehicle Charging Systems 1 Introduction 2 Analysis of the Two Compensation Topologies 2.1 DSLCC Topology 2.2 TMN 3 Interoperability Between the Two Topologies 3.1 LCC-TMN 3.2 TMN-LCC 4 Simulation Verification 5 Conclusion References Effect of Splitter Plates Material and Structure on Arc Characteristics Under the Action of Permanent Magnets 1 Introduction 2 Model Establishment 2.1 Geometric Model and Assumptions 2.2 Mathematical Model 2.3 Boundary Conditions and Initial Values 3 Simulation Results and Discussion 3.1 Magnetic Field Distribution Analysis 3.2 Arc Characteristic and Analysis 4 Conclusion References Parallel Current Sharing Suppression Strategy for High Frequency AC Inverters Based on the Principle of Active Current Decomposition 1 Introduction 2 Analysis of Circulating Current in Parallel Connection of High Frequency 3 High-Frequency Inverter Parallel Control Strategy 3.1 Signal Cross-Correlation Function 3.2 Current Decomposition Based on Continuous Signal Cross-Correlation Function 3.3 Decomposition Control Strategy Based on Active Current 4 MATLAB Simulation 5 Conclusion References Study on Arc Characteristics in Zero Zone of C4F7N/CO2Mixture 1 Mathematical Model and the Hypothetical Condition 1.1 Multiphysical Field Simulation Assumption Conditions 1.2 Arc Plasma Control Equation 1.3 Turbulence Control Equation 2 Note Calculation Model 3 Results and Discussion 3.1 Analysis of the Arc Characteristics Before Over-Zero 3.2 Analysis of the Arc Characteristics Near the Zero Zone 4 Conclusion References The Electric Power Equipment Online Monitoring System Based on ZigBee 1 Preface 2 Basic System Composition 3 ZigBee Module Design 4 The Design of Each Part of the System 4.1 Design of Temperature Measurement System 4.2 Design of Humidity Measurement System 4.3 Gas Monitoring System 5 Results and Experiments 5.1 System Settings 5.2 System Host Computer Debugging 5.3 System Hardware Debugging 6 Conclusion References A Load-Current Feed-Forward Control Method of TAB with Fast Regulation Ability 1 Introduction 2 Working Principle and Characteristics of TAB Converter 2.1 The Topology and Working Principle 2.2 Current Small Signal Modeling and Power Coupling Analysis 2.3 Dynamic Characteristic Analysis of TAB Converter 3 Analysis and Design of Load-Current Feed-Forward Control Strategy Based on Decoupling Network 4 Stability Analysis 5 Simulation and Experimental Verification 6 Conclusion References Experimental Study on Motion Characteristics of DC Air Arc Under Contact Rotation 1 Introduction 2 Image Preprocessing 2.1 The Noise Reduction Processing 2.2 Image Intensification 2.3 Image Segmentation 3 Experimental Results and Analysis 3.1 Influence of Separation Mode on Arc Root Motion 3.2 Effect of Separation Velocity on Arc Root Motion 3.3 Influence of Rotation Velocity on Arc Root Motion 4 Conclusion References Simulation on the Characteristics of Rotating Vacuum Arc Plasma 1 Introduction 2 The Model of Rotating Vacuum Arc 2.1 Physical Model and Basic Assumption 2.2 Mathematical Model 3 Boundary Condition 3.1 Cathode Side 3.2 Anode Side 3.3 Radial Boundary 4 Simulation Results and Analysis 5 Summary References Research on Coordinated Control Strategy of Variable Speed and Conventional Pumped Storage Units in HVDC Transmission System 1 Introduction 2 Coordinated Control Strategy of Pumped Storage Power Station 3 Coordinated Control Strategy of Pumped Storage Power Station 4 Coordinated Control Strategy of Pumped Storage Power Station References Research on Equivalent Circuit and Power Transmission Characteristic of Multi-winding Transformer 1 Introduction 2 Power Flow Analysis of MWT 2.1 DC-DC Converter with MWT 2.2 Equivalent Inductance 2.3 Power Transmission Characteristics with Different Series-Parallel Connection 3 Multi-winding Transformer 3.1 Winding Arrangements 3.2 Power Transmission Characteristics with Different Winding Arrangements 4 Conclusion References Parameter Identification of Electrochemical-Thermal Coupling Model for Large-Capacity Lithium-Ion Batteries Based on Neural Network Algorithm 1 Introduction 2 Experiment 3 Electrochemical-Thermal Coupling Model 3.1 Verification of One-Dimensional Electrochemical Model 4 Neural Network Model 5 Comparison Before and After Parameter Optimization 6 Conclusion References Development of a Hand-Held FE-DBD Plasma Device 1 Introduction 2 Experimental Equipment and Measurement Technology 2.1 Experimental Equipment 2.2 Measuring Method 2.3 Sterilization Performance Measurement 3 Experimental Results and Discussion 3.1 Discharge Voltage and Discharge Current Measurement 3.2 Measurement of Ozone 3.3 Optical Emission Analysis 3.4 Measurement of Temperature 3.5 Measurement of Sterilization Rate 4 Conclusion References A Quasi-Periodic Model for Dielectric Constant of Binary Particle Composite 1 Introduction 2 QPM of Particulate Composites 3 Factors Affecting Dielectric Properties 3.1 Influence of the Number of Particles 3.2 Influence of the Particle Shape 3.3 Influence of Particle Spatial Orientation 4 Conclusion References Preparation of PP/MgO Nanocomposite Films and Study on Its Dielectric Properties 1 Introduction 2 Samples Preparation and Experiments 3 Experimental Results 3.1 Infrared Spectrum 3.2 Dielectric Properties 4 Discussion 5 Conclusion References Modal Analysis and Optimal Design of FD-Type Anti-vibration Hammer 1 Introduction 2 Parametric Modeling of the Anti-vibration Hammer 3 Modal Analysis of Anti-vibration Hammer 3.1 Modal Analysis Theory of Anti-vibration Hammer 3.2 Finite Element Model of Anti-vibration Hammer 3.3 Finite Element Modal Analysis 4 Optimized Design of Anti-vibration Hammer 4.1 Optimize the Design Process and Parameter Calibration 4.2 Sensitivity Analysis 4.3 Optimization Analysis 4.4 Validation of Optimization Results 5 Conclusion References Transformer Electromagnetic Field Simulation and Its Internal Sensor Arrangement Scheme 1 Introduction 2 Establishment and Solution of Transformer Simulation Model 2.1 Transformer 2D Model 2.2 Finite Element Method 3 Results 4 Conclusion References Research on Resource Clustering Method of Virtual Power Plant Architecture Based on Cloud-Group-Edge Collaboration 1 Introduction 2 Cloud-Group-Side Collaboration Virtual Power Plant Architecture 3 Resource Cluster 4 Equivalent Aggregation 4.1 Model and Parameters of the Virtual Synchronous Machine 4.2 Equivalent Aggregation of Virtual Synchronization Machine Parameters 4.3 Simulation Verification 5 Conclusion References Analysis of the Influence of VSG Control on DC Micro-grid Bus Voltage 1 Introduction 2 Virtual Inertia Control of Grid-Connected Converter 2.1 Analysis of Mathematical Model of Grid-Connected Converter 2.2 AC Virtual Inertia Control Strategy 2.3 DC Virtual Inertial Control Strategy 3 Small Signal Modeling 3.1 Small Signal Modeling of AC Virtual Inertial 3.2 Small Signal Modeling of DC Virtual Inertial 4 Dynamic Analysis 5 Stability Analysis 6 Simulation Verification 7 Conclusion References A Compensation Method of Point of Common Coupling Voltage for Microgrid Based on Voltage Estimation 1 Introduction 2 Power Control Strategy of Parallel Inverters in Microgrid 2.1 Analysis of Inverter Parallel System and Power Transmission Characteristics 2.2 Analysis of Uneven Power Distribution Due to Impedance Mismatch 2.3 Theoretical Analysis of Reactive Power Balance Distribution and Voltage Droop 3 Voltage Compensation Based on Voltage Drop Estimation 3.1 Equivalent Impedance Design Based on Virtual Impedance 3.2 Improved Voltage Compensation Measures 4 The Simulation Verification 5 Conclusion References Research on Railway Relay Operation State Recognition Based on Improved Extreme Learning Machine 1 Introduction 2 Design of Test System 3 Characteristic Parameter Selection 3.1 Canonical Correlation Analysis 3.2 Importance Analysis of Random Forest Features 3.3 Construction of Operating State Recognition Model 4 Case Analysis 4.1 Data Preprocessing 4.2 Contact Performance Degradation Index Selection 4.3 Identification of Relay Operation Status 5 Conclusion References Control Bandwidth Design and Characteristic Analysis of Micro-grid Virtual Synchronous Generator 1 Introduction 2 Micro-grid Based on Virtual Synchronous Generator and Its Control Method 2.1 Power Control of Virtual Synchronous Generator 2.2 Voltage and Current Double Closed Loop Control 3 VSG Control Parameter Design Method 3.1 Current Loop Parameter Design 3.2 Voltage Loop Parameter Design 3.3 Power Loop Parameter Design 4 Simulation Analysis 4.1 Simulation of Frequency Characteristics When Active Load Changes 4.2 VSG Transient Characteristics Simulation 5 Conclusion References Research on Power Flow at Transmitting Side of Omnidirectional Wireless Energy Transmission System Based on Improved DD Coil 1 Introduction 2 Spatial Magnetic Field Modulation Strategy 3 2D Omnidirectional Wireless Power Transfer System 4 Experiment Verification 5 Conclusion References Review of Motor Bearing Currents in Inverter Drive System 1 Introduction 2 Generation Mechanism of Bearing Currents 3 Equivalent Circuit Model of Bearing Currents 3.1 dv/dtand EDM Bearing Currents 3.2 Circulating Bearing Currents 3.3 Rotor Ground Bearing Currents 4 Related Capacitances Computation of Bearing Currents 4.1 Motor Capacitances 4.2 Bearing Capacitance 5 Mitigation Techniques for Bearing Currents 6 Conclusion References Effect of electrode materials on dielectric properties of BOPP films 1 Introduction 2 Experimental materials and methods 2.1 Experimental materials 2.2 Preparation of BOPP film metallized electrodes 2.3 Microstructure characterization 2.4 Electrical performance characterization 3 Results and Discussion 3.1 Microstructure 3.2 Dielectric properties 3.3 Breakdown Characterization 3.4 Leakage current density Characterization 3.5 Polarization and energy storage performance 4 Conclusion References Impedance Modeling of Wind Turbine Converter Considering Submarine Cable Distribution Parameters 1 Introduction 2 Modeling of Converter Considering Submarine Cable 2.1 Impedance Model of D-PMSG 2.2 Impedance Model of Transformer 2.3 Impedance Model of Submarine Cable 3 Distribution Parameters of Submarine Cable 3.1 Finite Element Model of Submarine Cable 3.2 Multi-conductor Distributed Impedance Extraction 3.3 Submarine Cable Sequence Impedance Parameters 4 Case Study 4.1 Analysis of Submarine Cable Distribution Parameters 4.2 Analysis of Phase Coupling 4.3 Analysis of Cable Length 5 Conclusion References Analysis of the Influence of Bore Spacing Variation on the Static Contact About Rail-Gun 1 Introduction 2 Bore Spacing Measurement and Shape Analysis 3 The Effect of Bore Spacing on the Static Contact of Armature and Rail 3.1 Influence on the Static Force of the Armature 3.2 Influence on the Initial Contact State of the Armature and Rail 3.3 Test Verification of the Influence of Rail Spacing on Pivot Rail Contact 4 Bore Pitch Consistency Realization Method 5 Conclusion References Design of Magnetic Coupler Relative Position Detection System of Wireless Electric Vehicle Charging Using Low Frequency 1 Introduction 2 Principle of Relative Position Detection System 3 Software Design of Relative Position Detection System 4 Experiment of Relative Position Detection System 4.1 RSSI Ranging Experiment 4.2 Relative Position Detection Experiment 5 Conclusion References Consistency Screening of Lithium-Ion Batteries Based on Improved FCM Algorithm 1 Introduction 2 Measurement of Battery Parameters 3 Improved FCM Algorithm 3.1 Principal Component Analysis 3.2 Fuzzy C Means Algorithm 3.3 Initial Cluster Centers Optimization Using the K-means Algorithm 3.4 FCM Algorithm Membership Matrix Processing 4 Implementation and Analysis of Consistency Screening Based on Improved FCM Algorithm 5 Conclusion References Simulation and No-Load Operation Characteristics Analysis of New 0.18 mm Oriented Silicon Steel Laminated Core Joint 1 Introduction 2 Research Strategy and Methods 2.1 Joint Zone Model 2.2 Equivalent Magnetization Curve of Core Joint Area 3 Fingdings 3.1 Joint Zone Equivalent B-h Curve 4 Results 4.1 No-Load Operation Characteristics of Different Modeling Methods 4.2 Comparison of Test Results 5 Conclusion References A Design of Improving the Single-Phase Uncontrollable Rectifier Circuit’s Power Factor Based on UCC28019 1 Introduction 2 Control Principle of Power Factor Correction 2.1 Characteristics of the PFC Control Circuit 2.2 Control Principle of UCC28019 3 Design of Power Factor Correction Circuit 3.1 Design of Boost Main Circuit 3.2 APFC Control Circuit Design Based on UCC28019 3.3 Output Voltage Setting Circuit 3.4 Power Factor Measurement Circuit 4 Test Results 4.1 Voltage Adjustment Rate 4.2 Load Adjustment Rate 4.3 Input Power Factor Test 4.4 Output Voltage Adjustable Test 5 Conclusion References Study on Maximum Power Point Tracking Method of Photovoltaic Power Generation System 1 Introduction 2 Photovoltaic System and Photovoltaic Cells 2.1 Photovoltaic System 2.2 Equivalent Modeling of Photovoltaic Cells 3 DC-DC Converter 4 Maximum Power Point Tracking 4.1 Perturb and Observe Method 4.2 Incremental Conductance Method and Quadratic Interpolation 4.3 Improved INC Method Based on Quadratic Interpolation 5 Simulation and Results 6 Conclusion References Space Vector Control of PMSM Based on Three-Level Inverter 1 Introduction 2 Design of Three-Level Inverter and SVPWM 2.1 Mathematical Model of PMSM 2.2 Three-Level Inverter and SVPWM 3 PMSM Vector Control System Based on Three-level Inverter 4 Simulation Design and Results 5 Conclusion References The Control Strategy Research of Distributed DC Micro-grid for Spacecraft 1 Introduction 2 DC Micro-grid System 2.1 Topology of the System 2.2 Modeling Analysis 2.3 Control Strategy 3 MATLAB Simulation 3.1 Simulation of Single Converter 3.2 Simulation of Multi Converters in Parallel 4 Prototype Test 5 Conclusion References Optimal Design of Magnetic Integrated Transformer for Three-Phase LLC Converter 1 Introduction 2 Three Phase LLC Resonant Converter 3 Design of Three-Phase MIT 3.1 Structure of Three-Phase MIT 3.2 Objective Function 1: Power Density PD 3.3 Objective Function 2: Loss Ptot 3.4 Objective Function 3: Heat Dissipation Sheat 3.5 Objective Function 4: Leakage Inductor Lσ 3.6 Optimization Design Steps 4 Optimization Design of Three-Phase MIT 5 Experimental Verification 6 Conclusion References Scheme Design of a Lightweight Equipotential Maintenance Robot for Overhead Transmission Lines 1 Introduction 2 Overall Scheme Design of Maintenance Robot 3 The Design of Each Module of the Robot 3.1 The Main Control Cabinet 3.2 Robotic Arm 3.3 Work Execution Mechanism 3.4 Fixing Mechanism 3.5 Remote-Control Terminal 4 Simulation 5 Conclusion References Research on the Performance of Electronically Controlled Adjustable Inductor and Its Application 1 Introduction 2 Mentality of Designing 2.1 Functional Block Diagram 2.2 MCU Control 2.3 Filtering and Amplifying Circuit 2.4 Inductor Coil 3 Mentality of Designing 3.1 Current Change 3.2 Coil Change 3.3 Frequency Change 3.4 The Number of Turns Changes 4 Application Scenarios 4.1 Research on Load Capacity 4.2 Practical Application Verification 5 Conclusion References Design of High Power Density Wireless Charging System for Unmanned Aerial Vehicle 1 Introduction 2 Design of the Magnetic Coupler 3 The Electromagnetic Shielding Design of the Magnetic Coupler 3.1 Modeling Analysis of Carbon Fiber Fuselage and WPT System 3.2 Electromagnetic Shielding Design 4 Experiment 5 Conclusion References Research of Energy Management Strategy for Hybrid HEV Based on Optimization Rules 1 Introduction 2 Hybrid HEV Configuration Analysis and System Modeling 3 Rule-Based Energy Management Strategy Design 4 Particle Swarm Optimization Control Strategy 4.1 Fitness Function Design and Boundary Value Processing 4.2 Implementation of Optimization Strategy 5 Simulation and Result Analysis 6 Summarize References Pattern Recognition of GIS Typical Defects Based on Convolutional Neural Network 1 Introduction 2 Convolutional Neural Network 2.1 Convolution Layer 2.2 Pooling Layer 2.3 Full Connection Layer 2.4 Parameter Training of Convolutional Neural Networks 3 Results and Analysis 3.1 Obtaining Data 3.2 Training Model 4 Conclusion References Fault Diagnosis Method of Islanded DC Microgrid Based on Wavelet Sliding Window Energy 1 Introduction 2 Fault Analysis of Islanded DC Microgrid System 2.1 Islanded DC Microgrid System 2.2 Faults Analysis 3 Proposed Fault Diagnosis Scheme 3.1 Fault Feature Extraction Based on Wavelet Sliding Window 3.2 Fault Classification Based on Support Vector Machine 4 Simulation Validation 4.1 Simulation Parameters 4.2 Diagnosis Result and Analysis 5 Conclusion References Research on Selection for External Cooling System of Converter Valve in Converter Station 1 Introduction 1.1 A Subsection Sample 2 External Cooling Modes of Converter Station 3 Selection Method Based on Improved PCA and Bayesian Classification 4 Experimental Results 4.1 Experimental Test Design 4.2 Results Analysis 5 Conclusion References Reason Analysis and Solution of Reactor Heating Based on Finite Element Simulation 1 Introduction 2 Brief Description of Defects 3 Analysis of Magnetic Field Influence Theory 4 Simulation of Air-Core Reactor Group 4.1 Magnetic Field Simulation 4.2 Magneto-Thermal Coupling Simulation 5 Solution 6 Conclusion References Evaluation Method and Example Verification of Comprehensive Power Generation Performance of Photovoltaic Power Station 1 Introduction 2 Comprehensive Power Generation Performance Evaluation Index System of Photovoltaic Power Station 2.1 Principles for Determining Evaluation Indicators 2.2 Establish Index System According to Delphi Method 3 Comprehensive Power Generation Performance Evaluation Method of Photovoltaic Power Station 3.1 Determination of Index Weight by Improved Entropy Weight Method 3.2 Fuzzy Comprehensive Evaluation Model to Determine the Evaluation Results 4 Example Verification 5 Conclusion References Res-LSTM Infrared Image Fault Identification Method Based on Improved BEMD Frequency Domain Decomposition 1 Introduction 2 Res-LSTM Fault Identification Network Based on Improved BEMD Frequency Domain Decomposition 2.1 Basic Principles of BEMD 2.2 The Improved BEMD 2.3 Res-LSTM Fault Identification Network Structure Based on Improved BEMD Frequency Domain Decomposition 3 Experimental Design and Analysis 3.1 The Experiment Design 3.2 Experimental Results and Analysis 4 Conclusion References Improved SVPWM Modulation Strategy for Improving Zero Crossing Distortion of Vienna Rectifier 1 Introduction 2 Modulation Strategy to Improve the Zero-Crossing Distortion Problem 3 Modulation Strategy to Improve the Zero-Crossing Distortion Problem 4 Experiment References Research on Denoising of Magnetocardiogram 1 Introduction 2 Introduction to Theory 2.1 Decomposition of MCG 2.2 Determination of Noisy IMF 2.3 Windowed Reconstruction and Savitzky-Golay Smoothing Filter 3 Experimental Verification 3.1 Simulation Signal Analysis and Verification 3.2 Measured Signal Verification 4 Conclusion References Individual Blade Pitch Control Method of Spar Floating Wind Turbine Based on IPSO-PID 1 Introduction 2 Floating Offshore Wind Turbine System Modeling 2.1 Floating Wind Turbine Aerodynamic Load Analysis 2.2 Analysis of Floating Foundation Hydrodynamic Model 2.3 Analysis of Mooring System of Floating Wind Turbine 3 Design of PID Controller Based on IPSO 4 Independent Pitch Control Strategy 5 Simulation Result Analysis 6 Conclusions References Research on Technical Due Diligence Scheme and Technical Points of Photovoltaic Power Station 1 Introduction 2 Significance of Technical Due Diligence 3 Main Scope of Technical Due Diligence 4 Technical Due Diligence Work Essentials 4.1 Project Design Investigation 4.2 Equipment Quality Inspection Test and Evaluation 4.3 Construction Quality Inspection and Evaluation 4.4 Power Station Power Generation Efficiency and Safety Evaluation 4.5 Power Station Operation and Maintenance Evaluation 5 Risk Analysis and Preventive Measures 6 Conclusion References Optimal Scheduling Strategy of Integrated Energy System Considering Energy Storage Lifetime Decay 1 Introduction 2 Integrated Energy System Model 3 Storage Life Attenuation Model 3.1 Storage Capacity Attenuation 3.2 Industry-in-Storage State 4 Integrated Energy System Optimization Scheduling Model 4.1 Optimized Scheduling Model of Unnecessary Life Attenuation 4.2 Optimized Scheduling Model of Energy Storage Life Attenuation 5 Example Verification 6 Conclusion References Thermal Calculation of Gas-Insulated Bus Include Current-Carrying Friction Induced Contact Degradation Effect 1 Introduction 2 GIB Physical Structure and Contact Equivalent Method 3 Contact Resistance Degradation Characteristics 3.1 Current-Carrying Friction Test of Contact 3.2 Analysis of Degradation Trend Based on EWMA Algorithm 4 Numerical Calculation of GIB Temperature Rise Considering Contact Degradation Effect 4.1 Electrical Mathematical Model and Boundary Conditions 4.2 Thermal-Fluid Mathematical Model and Boundary Conditions 4.3 Analysis and Verification of Calculation Results 5 Temperature Rise Characteristics of GIB in Multiple Operation Time 5.1 Power Loss 5.2 Fluid Field Distribution 5.3 Thermal Field Distribution 6 Conclusion References Review on Enhancing Electrical Conductivity of Seawater 1 Introduction 2 Influencing Factors of Seawater Electrical Conductivity 2.1 Temperature 2.2 Seawater Salinity 2.3 Pressure 3 Methods of Enhancing Seawater Electrical Conductivity 3.1 Injecting Strong Acid and Alkali Seed Solution 3.2 Injecting Metal Particles with High Conductivity 3.3 Ultrasonic Method 3.4 Discharge Plasma in Liquid Method 4 Challenges of Enhancing Seawater Conductivity in MHD Propulsion 5 Conclusions References Characteristic Analysis and Pattern Recognition of Partial Discharge in Simulated Defects of XLPE Cable 1 Introduction 2 Typical Defect Model and Measurement System 2.1 Typical Defect Model Types and Production 2.2 Partial Discharge Experimental Measurement Platform 3 Experimental Results and Analysis 3.1 Internal Air Gap Discharge 3.2 Spike Discharge 3.3 Creeping Discharge 3.4 Suspended Discharge 4 Research on Feature Extraction and Pattern Recognition 4.1 Feature Extraction 4.2 SVM-Based Defect Pattern Recognition 5 Conclusion References Period Energy Method to Detect Demagnetization Failure of Surface Mounted Permanent Magnet Motor with Search Coil 1 Introduction 2 Analytical Model 2.1 Carter Coefficient 2.2 Air Gap Magnetic Field Calculation 2.3 Coil Induced Voltage 3 Period Energy Method 4 Finite Element Verification 5 Conclusion References A Design to Improve the Reliability of Relay Protection Control Equipment 1 Introduction 2 Analysis of Control Equipment Design 2.1 Chip Timing Design and Analysis 2.2 Optimal Design 3 Working Principle and Parameter Design 4 Simulation Analysis 5 Experimental Results and Analysis 6 Conclusion References Summary of Wind Farm Voltage Problem and Reactive Power Optimal Control Strategy 1 Introduction 2 Voltage Problems of WFs Connected to the Grid 2.1 Voltage Flicker and Fluctuation 2.2 Voltage Drop 3 WF Var and Voltage Optimization Control 3.1 Sensitivity Analysis 3.2 Optimal Control of Var in WFs 4 Conclusion References Application of Artificial Neural Network in Power Electronic Control 1 Introduction 2 Types of Neural Network 2.1 Classical Neural Network 2.2 Neural Network Combined with Other Algorithms 2.3 Neural Network Based on Biological Model 2.4 Neural Network Based on Deep Learning 3 Roles of Neural Network in Power Electronic Control 3.1 Neural Network Acts as Controlled Object 3.2 Neural Network Applied to Controller 3.3 Neural Network for Hybrid Control 3.4 Neural Network Used for Intelligent Analysis 4 Problems and Solutions 5 Summary References Multi-objective Optimization of Voltage Sag Monitoring Bus Based on Controllable Observation Ability 1 Introduction 2 Calculation of Voltage Sag Amplitude 2.1 Sectional Method to Construct Observable Matrix 2.2 Build Fuzzy Control Model 2.3 Observation Capability Improvement Segmentation Method 3 Non-Dominant Sorting Genetic Algorithm (NSGA2) for Multi-Objective Optimization of Monitoring Bus 4 Case Analysis 5 Conclusion References The Reciprocity Theorems for Momentum and Angular Momentum for Electromagnetic Field 1 Introduction 2 Method 2.1 The Momentum Reciprocity Theorem (MRT) 2.2 The Angular Momentum Reciprocity Theorem (AMRT) 3 Conclusion References Hot Spot Temperature Identification Method of GIS Disconnector Based on Multiphysics Coupling and Streamline 1 Introduction 2 Simulation Model and Process 2.1 Model Establishment 2.2 Governing Equations and Boundary Conditions 3 Simulation Results and Verification 3.1 Analysis of Loss Calculation Results 3.2 Analysis of Temperature Rise Calculation Results 3.3 Verification of Simulation Calculation Results 4 Identification of Hot Spot Temperature 4.1 Selection of Monitoring Points for Shell Features 4.2 Establishment of Hot Spot Temperature Identification Model 5 Conclusion References Model-Free Predictive Current Control of DTP-PMSM Based on Ultra-local Model 1 Introduction 2 Mathematical Model of DTP-PMSM 3 Ultra-local Model and Controller 3.1 Ultra-local Model 3.2 Designed Controller 4 Model-Free Current Predictive Control of DTP-PMSM 4.1 Ultra-local Model of DTP-PMSM 4.2 Determination of the Unknown Part F 4.3 Model-Free Current Controller for DTP-PMSM 5 Simulation Results 5.1 Analysis of Simulation Results Under Parameter Matching 5.2 Analysis of Simulation Results Under Parameter Mismatch 6 Conclusion References Study on the Control Strategy of PWM Rectifier Based on the DSP and FPGA 1 Introduction 2 Three Phase Voltage Source PWM Rectifier 3 Control Strategy and Simulation of PWM Rectifier 4 PWM Rectifier Control System Based on DSP and FPGA 5 Experimental Results and Analysis of PWM Rectifier References Fault Diagnosis Method for Transformer Based on KPCA and SSA-SVM 1 Introduction 2 Kernel Principle Component Analysis 3 SVM Parameter Optimization Based on Sparrow Search Algorithm 3.1 Support Vector Machine 3.2 SSA Algorithm 3.3 Sparrow Search Algorithm Optimizes SVM Parameters 4 Transformer Fault Diagnosis Based on KPCA and SSA-SVM 4.1 Fault Type Classification and Feature Selection 4.2 Concrete Realization Process of Transformer Fault Diagnosis 5 Example Analysis 5.1 Fault Sample and Data Pretreatment 5.2 Analysis of Feature Value Optimization Results Based on Kernel Principal Component Analysis 5.3 Parameter Optimization 5.4 Contrast of Diagnostic Results of Diverse Diagnostic Models in KPCA Dimensionality Reduction 5.5 Comparison of Diagnostic Results of Different Diagnostic Models in KPCA Dimensionality Reduction 5.6 Influence of the Number of Training Samples on Fault Diagnosis Outcomes 6 Conclusion References Research on PMSM Dead-Time Compensation Method Based on an Improved LMS Algorithm 1 Introduction 2 Influence Analysis of Dead-Time Effect 2.1 Principle of Dead-Time Effect in Three Phase Inverter 2.2 Error Voltage Mathematical Model 3 Adaptive Filter Algorithm 3.1 An Adaptive Filter Algorithm Based on Traditional Fixed-Step LMS 3.2 Adaptive Filter Algorithm Based on Variable-Step LMS 3.3 Simulation of Adaptive Filter Algorithm Based on Improved Variable-Step-Size LMS 4 Dead-Time Voltage Compensation of Improved LMS Filter Algorithm 4.1 Output Voltage Compensation of Improved LMS Adaptive Filter Based on PMSM 4.2 The Simulation Analysis 5 Conclusion References Influence of Circuit Parameters on Discharge Characteristics and Shock-Wave in Underwater Electric Wire Explosion 1 Introduction 2 Construction of the Experimental Platform 3 Experimental Results and Discussion 3.1 Load Discharge Parameters Under Different Energy Storage 3.2 Load Discharge Parameters Under Different Energy Storage with an Inserted Inductor 3.3 The Impact of Adding Inductance Components on the Shock-wave Generated by the Explosion of Metal Wires in Water 4 Conclusion References Analysis of the Influence of Three Condenser Microphones on the Audible Sound Signal Characteristics of the Needle Plate Electrode Discharge in the Oil 1 Introduction 2 Condenser Microphone 2.1 Working Principle 2.2 Laboratory Microphone Performance Analysis 3 Analysis of Fixed Frequency Audio Signals with Three Microphones 4 Analysis of Audible Sound Signal of Needle Plate Electrode Discharge in Oil 4.1 Discharge Test Arrangement of Needle Plate Electrode in Oil 4.2 Wavelet Packet Energy Analysis of Audio Signals at Different Voltage Levels of the Analog Transformer Oil Tank 5 Conclusion References Research on the Mode Switching Scheme and Control Strategy of the DCDC Converter at the Receiver of DWPT System 1 Introduction 2 Analysis of Double-Tube Buck-Boost Operation Mode 2.1 Mode Switching Principle 2.2 Output Current Inductor Current Double Closed Loop Control 3 Experimental Verification of Mode Smooth Switching 4 Conclusion References Research on Creepage Distance Measurement Method of Rod Insulator Based on Image Stitching 1 Introduction 2 Problems and Analysis of Conventional Image Measurement Algorithms 3 Creepage Distance Measurement Method Based on Image Stitching 3.1 Continuous Image Acquisition 3.2 Image Stitching 3.3 Measurement and Calculation of Creepage Distance 4 Result Analysis 4.1 Results and Analysis of Image Stitching 4.2 Measurement Results and Analysis of Creepage Distance 5 Conclusion References Multi-objective Optimization Design of PV Inverter Based on DO-NSGAIII Algorithm 1 Introduction 2 Three-Phase ANPC Inverter System 3 Customized Design Route 4 Multi-objective Optimization of PV Inverters 4.1 Objective Function 4.2 New DO-NSGAIII Algorithm 5 Optimization Example 6 Conclusion References Research on the Scheme and Experiment of Quantum-Voltage-Based Verification Device for the Transformer Calibrator 1 Introduction 2 Verification Device Scheme Based on AC Quantum Voltage 3 Experimental Scheme of Verification Device Based on Analog Quantum Voltage Source 3.1 Experimental Scheme of Verification Device with Reference Source 7410 3.2 Instrument Selection, Characteristics and Configuration 3.3 Overall Sequential Logic 4 Experimental Test and Result Analysis 5 Conclusion References Research on Mechanical Vibration Characteristics of Gas Insulated Transmission Lines Based on Transient Electromagnetic-Mechanical Coupling Model 1 Introduction 2 Simplified Geometry Model and Mechanical Vibration Principle of GIL 2.1 The Principle of GIL Mechanical Vibration 2.2 Propagation Path and Analysis Method of Mechanical Vibration 2.3 Geometry Model of GIL 3 Simulation of Vibration Characteristic Based on Transient Electromagnetic-Mechanical Coupling Model 3.1 Governing Equations and Boundary Condition of Transient Electromagnetic Field 3.2 Governing Equation of GIL Vibration Transient Structure Field 4 The Vibration Results of Numerical Simulation and Experiment 4.1 Calculation of Electromagnetic Field and Electromagnetic Force 4.2 Calculation Results of Transient Structural Field 4.3 Results of Test 5 Conclusion References Simulation of Nitrogen Spark Discharge Characteristics Under Continuous Nanosecond Pulse at Atmospheric Pressure 1 Introduction 2 Simulation Model 3 Results and Discussion 3.1 Discharge Development Process During the Voltage Pulse 3.2 Variation of Charged Particle Number Density During the Pulse Interval 3.3 Spark Discharge Energy Deposition and Dissipation Process 4 Conclusions References Research on DC Breaking Performance of the Organic Thermal Fuse 1 Introduction 2 Experimental Principle 2.1 Structure and Working Principle of Thermal Fuse 2.2 Experimental Principle of Thermal Fuse Breaking 3 Experimental Analysis of Thermal Fuse Breaking 3.1 Test and Analysis of Breaking Process 3.2 Test and Analysis of Breaking Speed 4 Optimization of Thermal Fuse and Experimental Analysis 4.1 Thermal Pellet Optimization 4.2 Thermal Pellet and Trip Spring Optimization 5 Conclusion References Research on Optimal Coil Parameter Configuration of Single Relay High Voltage Wireless Power Transfer System 1 Introduction 2 Theoretical Analysis of WPT System 3 Simulation Analysis 4 Experimental Verification 5 Conclusion References A Method for Realizing Variable Transconductance Constant Current Output of LCC-N Compensated IPT System 1 Introduction 2 Modeling and Analysis of LCCN Compensation IPT System 2.1 Resonant Tank Circuit Model and Analysis 2.2 Multi-load Application IPT System Model 3 Variable Transconductance Constant Current Output 3.1 Constant Current Output Characteristic Resonant Condition 3.2 Realization Method of Variable Transconductance Output Characteristics 4 Analysis of Realization Method of Fixed Coupling Coefficient of Coupling Structure 5 Experiment Analysis 5.1 Experimental Platform Construction and Scheme Design 5.2 Experimental Verification 6 Conclusion References Influence of Transverse Magnetic Field and Breaking Speed of Contact on DC Arc Characteristics 1 Introduction 2 Experimental Device and Conditions 2.1 Arc Experimental System 2.2 Experimental Condition 3 Experimental Results and Analysis 3.1 Effect of Transverse Magnetic Field on Arc Characteristics 3.2 Effect of Breaking Speed on Arc Characteristics 4 Conclusion References Lithium-ion Battery Modeling Method Considering Temperature and Current 1 Introduction 2 Modeling Method 2.1 Experimental Design 2.2 Open Circuit Voltage Modeling Method 2.3 Internal Resistance Modeling Method 3 Modeling Example 3.1 Experiment Procedure 3.2 Open Circuit Voltage Modeling Process 3.3 Internal Resistance Modeling Process 3.4 Experimental Verification 4 Conclusion References Analysis of Subsynchronous Oscillation Characteristics in Wind-Thermal Bundled System Integrated to Compensated Grid 1 Introduction 1.1 A Subsection Sample 2 The Structure of System 2.1 Basic Principles of DFIG Wind Turbines 2.2 Basic Principles of Synchronous Generators 3 Mode Damping Analysis Method 4 Analysis of Torsion Vibration Characteristics of SG 5 Time-Domain Simulation Verification 5.1 Influence of Shafting Torsional Vibration at Different Number of Wind Farms Grid-Connected 5.2 Influence of Shafting Torsional Vibration at Different Current Loop Control Parameters 5.3 Influence of Shafting Torsional Vibration at Different Operating Wind Speeds 6 Conclusion References A Modeling Method for Common Mode Noise of ANPC Inverter System Based on ANN 1 Introduction 2 Three -phase ANPC Inverter System 2.1 System Specification 2.2 Common Mode Noise 3 Modeling of Common Mode Noise Based on ANN 3.1 ANN Input and Output Analysis 3.2 ANN Training 3.3 ANN Test 4 Conclusion References Electromagnetic Analysis of High Current Density Superconducting Cables for Superconducting Wind Turbines 1 Introduction 2 Cable Design 3 Cable Electromagnetic Calculation 4 Finite Element Simulation of Magnetic Field Under Industrial Frequency Current 4.1 Finite Element Simulation 4.2 Build the Simulation Model 4.3 Simulation Results 5 Conclusions References Electromagnetic Simulation and Design of 200 kV DC Superconducting Current Limiter 1 Introduction 2 Electromagnetic Simulation Analysis of Superconducting Current Limiter 2.1 Current Limiting Unit Structure 2.2 Superconducting Coil Electromagnetic Design 3 Prototype 4 Conclusion References Study on Modeling of Support Insulator for GIL Transmission Pipeline 1 Introduction 2 GIL Support Insulator Model Structure 3 Area Division and Meshing 3.1 Area Division and Dielectric Constant 3.2 Meshing 4 Electric Field Simulation of GIL Supporting Insulator 4.1 Simulation Effect of Three Different Shapes 4.2 The Influence of Insulator Leg Length on the Extreme Value of Electric Field 4.3 Influence of SF6's Dielectric Constant on the Extreme Value of Electric Field 5 Conclusion References Modeling Calculation of Tumor Treatment Field in Human Thoracic and Optimization Strategy of Electrode Array 1 Introduction 2 Materials and Methods 2.1 Chest Cavity Modeling Method 2.2 Electrode Array Materials and Design 2.3 Simulation Analysis Method 3 Result 3.1 Simulation Results Under the Initial Electrode Layout 3.2 Rotating Array Layout Increases the Electric Field Intensity at the Tumor 4 Discussion 5 Conclusion References Research and Test of the Error Self-monitoring Merging Unit 1 Introduction 2 Hardware Architecture of the MU 2.1 Error Self-monitoring with Synchronous Control 2.2 Management Center 2.3 Sampling Processing 3 Software Scheme of Sampling Processing 3.1 Decimation Filtering and Resampling 3.2 Sampling Control 3.3 9-2 Message Sending 3.4 Error Correction 4 Measurement Accuracy Test 5 Conclusion References Review of Research on Ship’s Physical Field Characteristics and Underwater Attack and Defense Technology 1 Introduction 2 Sound Field 2.1 Research on the Characteristics of Sound Field 2.2 Application of the Characteristics of Sound Field 3 Electric Field 3.1 Research on the Characteristics of Electric Field 3.2 Application of the Characteristics of Electric Field 4 Magnetic Field 4.1 Research on the Characteristics of Magnetic Field 4.2 Application of the Characteristics of Magnetic Field 5 Hydraulic Pressure Field 5.1 Research on the Characteristics of Hydraulic Pressure Field 5.2 Application of the Characteristics of Hydraulic Pressure Field 6 Conclusion References Processing Techniques and Performance Analysis of Novel Eco-friendly Silver-Graphene Composite Coating 1 Introduction 2 Experimental Materials and Methods 2.1 Preparation Process of Silver-Graphene Composite Plating 3 Analysis of the Experimental Results 3.1 Contact Resistance of the Silver-Graphene Composite Plating 3.2 Wear Resistance of the Silver-Graphene Composite Plating 3.3 Micromorphology of the Silver-Graphene Composite Plating 4 Conclusion References Electromagnetic Analysis and Optimization Design of a New Structure Superconducting Cable with High Heat Dissipation Based on Superconducting Synchronous Compensator 1 Introduction 2 The Specific Structure of the Cable 3 Electromagnetic Finite Element Simulation Model 3.1 Introduction of the Basic Principle 3.2 The Building of Finite Element Simulation Model 3.3 The Setting of Compare Parameter 4 Post-processing of Finite Element Model Results 5 Results and Analysis 6 Conclusion References Optimal Weighting Coefficient Assisted Reliability-Based Robust Optimal Design of Electrical Devices 1 Introduction 2 Basic Knowledge Related with Uncertainty 3 A New Optimal Design Method Considering Reliability and Robustness Based on Optimal Weighting Coefficient 4 Numerical Validation 4.1 Analytic Test Function 4.2 Optimization of Superconducting Magnetic Energy Storage System 5 Optimal Design of Permanent Magic Ring 6 Conclusion References Online Identification of Lithium Battery Equivalent Circuit Model Parameters Based on a Variable Forgetting Factor Recursive Least Square Method 1 Introduction 2 Lithium Battery Equivalent Model and Least Square Parameter Solution 3 Variable Forgetting Factor Recursive Least Square Method 3.1 General Recursive Least Square Method 3.2 Least Square Method with Variable Forgetting Factor 4 Experiment Platform 4.1 Introduction to the Experimental Platform 4.2 Initial Parameter Acquisition 4.3 Experimental Test Conditions 5 Experimental Verification and Result Analysis 5.1 Fixed Forgetting Factor Experiment 5.2 Variable Forgetting Factor Design and Verification 6 Conclusion References Research on Inter-station 2M Communication Protection Method Suitable for Stability Control System 1 Introduction 2 Analysis of Inter-station Communication in Safety Control Device 2.1 Inter-station Communication Status of Safety Control Devices 2.2 Interstation Communication Risk Analysis 2.3 Risk Effect Analysis 3 Inter-station Communication Protection Method of Safety and Stability Control System 3.1 Overall Scheme 3.2 Verification Code Generation Based on SHA256 3.3 Communication Anomaly Identification and Countermeasures 4 Example Analysis 5 Conclusion References Analysis on the Package Failure Modes and Condition Monitoring Methods of Wire-Bond IGBT 1 Introduction 2 Package Structure of WB-iGBT 3 Package Failure Modes and Condition Monitoring Methods 3.1 Bond Wire Failure 3.2 Solder Layer Failure 4 Discussion 4.1 Life Cycle Monitoring 4.2 Internal Parameters Monitoring 4.3 Non-contact Monitoring 5 Discussion References Performance Optimization of Two-Dimensional Straight Flow Channel with Variable Diameter for Proton Exchange Membrane Fuel Cells 1 Introduction 2 Model Description 2.1 Governing Equation 2.2 Geometric Model and Meshing 2.3 Initial and Boundary Conditions 3 Results and Analysis 3.1 Effects of Two-Dimensional Straight Flow Channel with Variable Diameter on Mass Transfer and Drainage Performance 3.2 Effects of Flow Channel Structure Parameters Aand Ωon the Drainage Performance 4 Conclusions References Parameter Identification Method of Two-Segments Three-Phase Interior Permanent Magnet Synchronous Motor 1 Introduction 2 Motor Model Analysis 3 Motor Parameter Identification Method 4 Motor Parameter Identification Method 5 Simulation Verification 6 Conclusion References Analysis of a Breakdown Accident Caused by Defects in the Terminal Stress Cone Interface of 220 kV Submarine Cable 1 Introduction 2 Sea Cable Terminal Breakdown Accident 2.1 Description of the Accident 2.2 Fault Sample Check 2.3 Analysis of the Physical and Chemical Characteristics of the Failed Cable Connector 3 Analysis of the Cause of the Failure 3.1 Construction Quality Issues 3.2 Analysis of Anatomical Results 3.3 Simulation Analysis 4 Conclusion Appendix References Author Index