The Proceedings of the 18th Annual Conference of China Electrotechnical Society : Volume VII

Contents RUL Prediction Method of Series Battery Based on Improved Limit Learning Machine 1 Introduction 2 Extraction of Characteristic Parameters of Series-Connected Battery Recession 2.1 Energy Signature 2.2 Time Interval for Charging Voltage Rise 2.3 Standard Deviation Signal (Electronics) 2.4 Charge Current Drop Interval 2.5 Skewness Signal 3 RUL Prediction Method for Series-Connected Batteries 3.1 Establishment of Battery RUL Prediction Model Based on Improved Limit Learning Machine 3.2 Quantification of Uncertainty in Forecast Results 4 Analysis of Experimental Arguments 4.1 Experimental Preparation 4.2 Description of the Experiment 4.3 Analysis of Projected Results 5 Summarize References Impulse Flashover Characteristics of High-Voltage Post Insulators in High Altitude Areas 1 Introduction 2 Methodology 2.1 Test Equipment 2.2 Test Setup 2.3 Test Sample 2.4 Test Procedure 3 Results 3.1 Lightning Impulse Flashover Testing Results 3.2 Operating Impulse Flashover Testing Results 4 Conclusion References Multi-agent Distributed Cooperative Control of Multi-energy Complementary Microgrid 1 Introduction 2 Multi-energy Complementary Microgrid and Microgrid Control Mode 2.1 Main Advantages of Microgrid Over Traditional Grid Power Supply 2.2 Microgrid Control Strategy 2.3 Microgrid Control Mode 2.4 Typical Microgrid Control Technology 3 Multi-agent System (MAS) 4 Distributed Generation and Distributed Management Control System 5 Design of Collaborative Control System 5.1 Microgrid Collaborative Control Technology 5.2 Microgrid Control Strategy Based on Multi-agent Distributed Algorithm 5.3 System Design Scheme 6 Simulation Experiment of Cooperative Control 6.1 Grid-Connected Operation Mode 6.2 Island Operation Simulation 7 Conclusions References Effect of Low Temperature on Impulse Discharge Characteristics of Insulator String 1 Introduction 2 Test Arrangement and Method 2.1 Sample 2.2 Experimental Setup and Method 3 Test Results and Analysis 4 Conclusions References Research on Rapid Cooling Technology for High Temperature Copper Parts 1 Introduction 2 Heating Analysis of Copper Part 2.1 Heating of Copper Part 2.2 Phase Change Cooling Scheme 3 Cooling Device and Test 3.1 Principle of Active Phase Change Cooling 3.2 Test Platform Construction and Test 4 Analysis of Test Results 5 Conclusion References Optimal Dispatching of Distribution Network Considering Inverter Air Conditioner Aggregation 1 Introduction 2 Mathematical Model of Inverter Air Conditioner Aggregation and Optimization 2.1 Room Thermal Modeling 2.2 Electrical Parameter Relationships 2.3 Demand Response Control Strategy 2.4 Objective Function 2.5 Constraints 3 Regulatory Potential Assessment and External Characterization 3.1 Parameter Initialization 3.2 Load Reduction with Different Number of Air Conditioners 3.3 Load Reduction with Different Outdoor Temperature 3.4 Load Reduction with Different Temperature Regulation 4 Numerical Results 4.1 Example Settings 4.2 Optimized Scheduling Results 5 Conclusion References Research on Coding Method of Polarization PLC System Based on Upper Bound of Bhattacharyya Parameter 1 Introduction 2 Basic Principle of Polar Code 2.1 Code Word Construction 2.2 Encoding 2.3 Decoding 3 Polarization PLC Channel Coding System 3.1 Transfer Probability of the PLC Channel 3.2 Reliability Estimation of Polarization PLC Channels 4 Simulation Experiment and Result Analysis 4.1 PLC Channel Simulation Model 4.2 Result Analysis 5 Conclusion References A Preventive Maintenance Strategy of Wind Turbine Gearbox Based on Stochastic Differential Equation 1 Introduction 2 Gearbox State Degradation Model 2.1 Model of SDE 2.2 Failure Rate Model 2.3 Stochastic Perturbation Model 2.4 Parameter Solution 3 Analysis of Preventive Maintenance Strategies Based on Condition Modelling 3.1 Theoretical Analysis of CBM Strategies 3.2 Theoretical Analysis of TBM Strategies 4 Example Analyses 5 Conclusion References Research Status of Contact on Breaking Performance of High Voltage Circuit Breaker 1 Introduction 1.1 High Voltage Circuit Breaker Development History 1.2 Life Evaluation Status of High Voltage Circuit Breakers 1.3 Reliability Evaluation Status of High Voltage Circuit Breakers 2 Influence of Contact Characteristics on Breaking Performance 2.1 Contact Resistance 2.2 Resistance to Arc Welding and Low Ablation Rate 2.3 Arc Root Migration 2.4 Dam a River 3 Research Status of Electric Contacts 3.1 Nano-Contact Materials 3.2 Doped Modified Contact Material 4 Conclusion References Simulation of Flow Characteristics in High-Voltage Circuit Breakers 1 Introduction 2 Methodology 2.1 Governing Equations 2.2 Supersonic Flow 2.3 Nozzle Geometry and Boundary Conditions 2.4 Simulation Conditions 3 Results and Discussion 3.1 Features of the Cold Flow in the Nozzle Area 3.2 The Influence of Outlet Condition 3.3 The Influence of the Smoothness Geometry of Nozzle Throat 3.4 The Influence of Position of Downstream Electrodes 4 Conclusion References Optimal Configuration of Hybrid Energy Storage Capacity Based on Improved Compression Factor Particle Swarm Optimization Algorithm 1 Introduction 2 The Constitution of Energy Storage Model 2.1 Hybrid Energy Storage System Topology 3 Optimization Objectives and Constraints 3.1 Full Life Cycle Costs 3.2 Objective Function 3.3 Electricity Supply Reliability Indicators 3.4 Restrictive Condition 4 Solution Method 4.1 Particle Swarm Algorithm 4.2 Improved Compression Factor Particle Swarm Algorithm 5 Example Simulation and Discussion 5.1 Parameter Setting of Example 5.2 Simulation Results and Analysis of Examples 6 Conclusion References A Novel SVM-Based Transient Protection Algorithm for Transmission Lines 1 Introduction 2 Constructing the Presented Algorithm 2.1 High Frequency Signal Propagation Characteristics of Busbars 2.2 Algorithm of the Presented Protection 3 Algorithm Application Verification 3.1 Simulation Cases 3.2 Fault Diagnosis Using SVM 4 Conclusions References Effect of Ion Types on Arc Erosion of Circuit Breaker Contact: Molecular Dynamics Simulation Study 1 Introduction 2 Positive Ions in SF6 arc Plasma 3 Simulation Methodology 4 Results and Discussion 5 Conclusion References Research on the Delay Characteristics of 5G Communication Networks for Regional Protection in Power Distribution Grids 1 Introduction 2 Distribution Network Area Protection Architecture 2.1 Centralized Architecture 2.2 Intelligent Distributed Architecture 2.3 Regional Centralized Architecture 3 5G Bearing Area Protection 4 Regional Protection Delay Analysis 4.1 Centralized Protection Delay 4.2 Intelligent Distributed Protection Delay 4.3 Regional Centralized Protection Delay 5 Simulation and Analysis 5.1 Different End-to-End Delays of Three Architectures 5.2 Different End-to-End Delay with Varying Routing Parameters in Regional Centralized Architecture 6 Conclusion References Distributed Reactive Power Control Scheme for Parallel Inverters Based on Virtual Impedance 1 Introduction 2 Microgrid Parallel Inverter Model Considering Circulating Current 3 Analysis of Reactive Power Distribution Problems 3.1 Analysis of Reactive Power Distribution Problem Based on Virtual Impedance 3.2 Analysis of Distributed Reactive Power Distribution with Virtual Impedance Without Communication 4 Distributed Optimization Control Scheme for Parallel Inverters 4.1 Distributed Optimization Virtual Impedance Control Theory 4.2 Distributed Optimization Process of Virtual Impedance 4.3 Secondary Regulation of Voltage and Frequency 5 Experiment and Simulation Analysis 6 Conclusion References On Line Estimation of Power Line Channel Impedance Based on Transfer Function 1 Introduction 2 Theoretical Basis 3 Impedance and Transfer Function Mapping Based on Neural Network Model 3.1 Parameters of PLC Network Model 3.2 BP Neural Network Parameters 3.3 Analysis of Training and Test Results 4 Hardware Test 4.1 Sample Collection 4.2 Sample Processing 4.3 Impedance Identification 5 Conclusion References Research on Insulator Defect Detection Based on Improved YOLOv7 1 Introduction 2 Algorithm Improvement Based on YOLOv7 2.1 Improvement of Attention Mechanism 2.2 Improvement of the Feature Pyramid 2.3 Adjustment of Loss Function 3 Experimental Result and Analysis 3.1 Production of Data Sets 3.2 Configuration of the Experimental Environment 3.3 Test Index 3.4 Analysis of Experimental Results 4 Conclusion References Field Application of Switchgear Abnormal Noise Detection Based on Acoustic Imaging Technology 1 Introduction 2 Detection Method 3 On-Site Case 3.1 Case 1-Abnormal Noise of Mechanical Looseness 3.2 Case 2-Abnormal Noise of Mechanical Looseness 3.3 Case 3-Abnormal Noise of Internal Discharge 4 Conclusion References Compensation Capacitor Status Monitoring Research Based on Feature Fusion and SVM 1 Introduction 2 Modeling the Amplitude Envelope of Shunt Current 2.1 Main Track Modeling 2.2 Main Track Modeling 3 Feature Extraction of Shunt Current Curve 3.1 CEEMD Algorithm 3.2 LMD Algorithm 3.3 Fuzzy Entropy 4 Multi Classification SVM Compensation Capacitor Status Monitoring 4.1 Feature Fusion 4.2 SVM Principle 4.3 Multi-class SVM 5 Experimental Analysis and Results 6 Conclusion References Study on Acid Thermal Aging Characteristics of Composite Insulator Core Rod Material Based on TGA and SEM 1 Introduction 2 Samples and Experimental Methods 2.1 Experimental Procedure 3 Model and Calculation of Activation Energy 4 Experimental Results and Discussion 4.1 Thermogravimetric Analysis 4.2 Activation Energy Analysis 4.3 Microscopic Morphology Analysis 5 Conclusion References Research on Cumulative Fatigue Damage for Vortex-Induced Vibration of Steel Tube Tower 1 Introduction 2 Methods 2.1 Miner-Palmgren Model 2.2 Ye Duyi Model 2.3 Manson-Halford Model 2.4 Improved Manson-Halford Model 3 Fatigue Experiment Data 4 Results 5 Conclusions References A Model for Predicting the Flashover Voltage of Ice-Covered DC Insulator Strings Based on Extreme Learning Machine Neural Network 1 Introduction 2 Icing Insulator Flashover Voltage Prediction Model 2.1 Establishment of ELM Neural Network Prediction Model 2.2 Selection of Activation Function and Normalization Processing 3 Network Training and Analysis of Results 4 Conclusion References A Grid-Friendly Bidirectional Electric Vehicle Charger Based on CLC Resonant Converter 1 Introduction 2 Charger and Discharger Working Principle 2.1 AC/DC Interface Control Strategy 2.2 DC/DC Interface Control Strategy 3 Simulation Verification 4 Conclusion References Operation Strategy of Battery Swapping-Charging System for Electric Vehicle Based on Multi-material Flow with Space-Time Coupling Characteristics 1 Introduction 2 Space-Time Operation Mechanism 3 Solution Algorithm 4 Example Analysis 5 Conclusion References Analysis of Unrecoverable Breakdown Ground Fault Scenarios in the Internal Insulation of Large Generator Stators 1 Introduction 2 Physical Scenario Analysis of Stator Ground Fault 2.1 Unrecoverable Breakdown Grounding Fault Scenario of Stator Insulation 2.2 Analysis of Arc Current Power for Stator Ground Fault 3 Thermal Effect Damage Mechanism of the Unrecoverable Ground Fault Current in Stator Insulation 4 Simulation Analysis 5 Conclusion References Investigation on the Effect of the Self-generated Metal Vapour on the Cathode Spot Formation in Vacuum Arc by Molecular Dynamics Simulation 1 Introduction 2 Model 3 Results 4 Conclusion References Study on Electromagnetic Radiation Phenomenon in Electrical Wire Explosion 1 Introduction 2 Experimental Setup 2.1 Pulsed Discharge Facility 3 Results and Discussion 3.1 Main Process of the Electrical Explosion 3.2 Electromagnetic Radiation Behaviors 3.3 Time and Frequency Domain Analysis 4 Conclusion References Measurement and Analysis of Multiple Parameters of Enhanced Accelerator 1 Introduction 2 Principle of Accelerator 3 Measurement Method and Principle 3.1 The Measurement Principle of B Probe 3.2 The Principle of Speed Measurement with Light Curtain Target 3.3 The Principle of Laser Micro-displacement Measurement 4 Construction of Experimental Platform 4.1 Construction of Enhanced Accelerator Platform 4.2 Construction of Speed Measurement Platform 4.3 Construction of Laser Micro-displacement Measurement Platform 5 Analysis of Experimental Results 5.1 Experiment Parameter 5.2 Pulse Current Curve Analysis 5.3 Experimental Results of Velocity Measurement 5.4 Curve Analysis of Magnetic Induction Intensity 5.5 Vibration Curve Analysis of Lower Inner Track 6 Conclusion References Mathematical Modeling of Electrical Energy Storage System and Off-Grid Wind Turbine System Based on Load Demand Response 1 Introduction 2 Model of Proposed System 3 Modeling Techniques for Components 3.1 Maximum Power Point Tracking (MPPT) Control Algorithm 4 Mathematical Modeling of Micro-grid System 4.1 Renewable Source (Wind Turbine) 4.2 Battery Storage 4.3 Storage Controller 4.4 PWM Inverter 5 Results and Discussion 5.1 Conclusion References Consumption Modeling and Influencing Factors Analysis of Alkaline Water Electrolyzer 1 Introduction 2 Working Principle and Energy Consumption Calculation of Alkaline Electrolyzer 2.1 Principle of Alkaline Electrolyzer 2.2 Unit DC Energy Consumption 3 COSMOL-Based Modeling of Alkaline Electrolyzer Energy Consumption 3.1 Geometric Modeling and Parameter Setting 3.2 Setting Multiple Physical Fields 3.3 Grid Generation and Solution Settings 4 Simulation Results and Analysis of Influencing Factors 4.1 Analysis of Influencing Factors 4.2 Response Surface Analysis 5 Conclusion References A Model Predictive Control Approach for Reconfigurable Battery Energy Storage Systems 1 Introduction 2 Structural Study of Reconfigurable Battery Topologies in Energy Storage Systems 3 A Study of Single Phase Shift Control of DAB 4 A Model Predictive Control Approach for Reconfigurable Battery Energy Storage Systems 5 System Simulation and Experiment 5.1 Steady-State Simulation 5.2 Transient Simulation 6 Conclusion References Stability Analysis on Large-Scale Adiabatic Compressed Air Energy Storage System Connected with Power Grid 1 Introduction 2 Basic Principle of ACAES System 3 Thermodynamic Process in ACAES System 3.1 Thermodynamic in Compressor 3.2 Expansion Process in Turbine 3.3 Principle of Heat Exchanger 3.4 Basic Equations in Heat Storage Tank 3.5 Basic Equations in Air Reservoir 4 Grid Connected ACAES System 4.1 Mathematical Model of PMSM/G Control 4.2 Mathematical Model of PMSM/G 5 Stability Analysis on Grid Connected ACAES 5.1 Effect of Equivalent Inductance on Stability 5.2 Effect of Equivalent Resistance on System Stability 5.3 Effect of Propitiation Coefficient on System Stability 5.4 Effect of Integral Coefficient on System Stability 6 Conclusion References Handwritten Table Recognition Method Based on Multi-head Attention Mechanism and Knowledge Graph 1 Introduction 2 Handwritten Text Extraction 2.1 Multi-head Attention 2.2 Time Sequence Convolution is Combined with the Long-Head Attention Mechanism 2.3 Handwritten Text Recognition Model 3 Table Content Logical Structure Construction 3.1 The Construction of the Electric Power Knowledge Graph 3.2 PowerRoberta Layer 3.3 BiLSTM Layer 3.4 Visualization of the Electric Power Knowledge Graph 4 Handwritten form Identification 4.1 Form Preprocessing 4.2 Cell detection and Extraction 4.3 Handwritten Table Recognition Based on the Knowledge Graph 5 Case Analysis 5.1 Interpretation 6 Conclusion References Research on the Planning Method for EV Charger Allocation in Highway Network 1 Introduction 2 Charging System Guidance Framework for Highway Networks 3 EV Charging Behavior in Highway Networks 3.1 Model Description and Assumption Conditions 3.2 Waiting Time for Charging Behavior in Electric Vehicle Charging Stations 4 Model for Charging Station Quantity Allocation in Highway Networks 4.1 Charger Configuration Model 5 Case Study Setup and Analysis 5.1 Case Study Setup 5.2 Analysis of Case 6 Conclusion References Multi-fidelity Data Fusion for Electromagnetic Field Prediction of Electromagnetic Railgun Field 1 Introduction 2 Finite Element Calculation Model 2.1 Mechanism 3 ConvLSTM Theory and Multi-fidelity Modeling of Electromagnetic Field distributIons 3.1 ConvLSTM 3.2 Construction of the Loss Function 3.3 Multi-fidelity Electromagnetic Field Distributions Modeling 4 Data Sets 4.1 Modeling 4.2 Fidelity Division 5 Results 6 Conclusion References An Online Battery Electrochemical Impedance Spectroscopy Measuring Method 1 Introduction 2 System Configuration and EIS Measuring Method 3 Method Validation and Discussion 4 Conclusion References Research on Location Determination and Capacity Optimization Method for Large-Scale Energy Storage Station in Regional Power Grid 1 Introductory 2 Mathematic Model for Location Determination and Capacity Optimization 2.1 Multi-objective Functions 2.2 Constraints 3 Improved Particle Swarm Algorithm for Multi-objective Optimization 3.1 Traditional Particle Swarm Algorithm 3.2 Improved Particle Swarm Algorithm for Optimization 3.3 Flow Chart of Location Determination and Capacity Optimization 4 Case Study 5 Conclusion References Research on the Transient Temperature Field of the High-Speed Permanent-Magnet Motor for Dragging Pulsed Alternator 1 Introduction 2 Description of Specific Working Condition 3 Calculation of the Losses Under Specific Working Condition 3.1 Copper Loss 3.2 Iron loss 3.3 Rotor Eddy-Current Loss 4 Numerical Calculation of the Transient Temperature Field 4.1 Modeling of 3-d Transient Temperature Field 4.2 Variation of the Transient Temperature Field 4.3 Distribution of Temperature Field with Different Bursts of Discharge 4.4 Comparison with the Steady-State Temperature Field 5 Conclusions References Effect of Pre-qualification Test on Properties of Semi-conductive Shielding of High Voltage XLPE AC Cable 1 Introduction 2 Sample Preparation 2.1 Cable Material Sample Information 2.2 Pre-identification Test and Sampling of Cable Outer Shielding Layer 2.3 Sampling of Cable Outer Shielding Layer 3 Testing Methods 3.1 Gel Content Test 3.2 Scanning Electron Microscopy (SEM) 3.3 Differential Scanning Calorimetry (DSC) 3.4 X-Ray Diffraction (XRD) Test 3.5 Thermogravimetric Analysis (TGA) 3.6 Raman Spectroscopy 3.7 Volume Resistivity Test 3.8 Mechanical Tensile Test 4 Results and Discussion 4.1 Physical and Chemical Properties of Shielding Layer 4.2 Microstructural Changes in Shielding Layer 4.3 Analysis of Aggregation State Structure of Shielding Layer Matrix 4.4 Influence of PQ on Orderliness of Carbon Black in Shielding Layer 4.5 Influence of PQ Test on Thermal Stability of Shielding Layer 4.6 Changes in Macroscopic Performance of Shielding Layer 5 Conclusions References Study on Noise Characteristics of Scaled Capacitor Stacks 1 Introduction 2 Noise Measurement Experiment Platform 2.1 Mechanism 2.2 Arrangement of Measuring Points 3 Sound Field Distribution Characteristics 3.1 Horizontal Distribution Characteristics 3.2 Vertical Distribution Characteristics 4 Sound Field Simulation Analysis 5 Conclusions References Insulator Defects Detection and Classification Method Based on YOLOV5 1 Introduction 2 Related Work 2.1 YOLOv5 2.2 Evaluation Indicators 3 Methodology 3.1 Data Set Labelling 3.2 Data Set Augmentation 3.3 Improved YOLOv5 4 Experiments 4.1 Datasets 4.2 Experimental Setup 4.3 Experimental Results 5 Conclusion References Design and Implementation of Indirect Lightning Protection for Airborne Electronic Equipment 1 Overview 2 Indirect Lightning Protection Design 2.1 Lightning Protection Methods for Chassis 2.2 External Interface Signal Protection Methods 3 Design of TVS Selection 4 Test Verification References Optimization of Non-Destructive Testing of Power Equipment Based on X-ray Backscattered Imaging 1 Introduction 2 Theoretical Background 3 Geant4 Simulation 3.1 Insulator Defect Model 3.2 Electricity Meter Simulations 4 Experiment and Results 5 Conclusion References Visual Positioning Method for Unmanned Aerial Vehicle Charging Platform Using Cooperative Target 1 Introduction 2 Cooperative Target Graph 3 Target Detection 3.1 Image Pre-processing 3.2 Target Segmentation 4 Target Location 4.1 Position Location 4.2 Direction Determination 5 Experiments 5.1 Experiments in Laboratory 5.2 Experiments in Outdoor Condition 6 Conclusions References Statistical Distribution Law of CVT Test Data in Guangzhou Power Grid 1 Introduction 2 Analysis Method 3 Data Analysis 3.1 Global Analysis 3.2 Influence of Operating Years 3.3 Influence of Voltage Level 4 Conclusion References A Transformer Insulation Life Assessment Method Considering Variational Annual Load Coefficient 1 Introduction 2 Transformer Hot Spot Temperature Calculation Method 2.1 Multiphysics Simulation Computational Models 2.2 Empirical Formula for Transformer Transient Hot Spot Temperature Calculation 3 Insulation Life Assessment of Oil-Immersed Transformers 3.1 Insulation Aging Calculation Method 3.2 Insulation Life Loss Calculation 4 Transformer Remaining Life Prediction Considering Variational Annual Load Coefficient 4.1 Transformer Remaining Insulation and Useful Life Prediction Method 4.2 Transformer Remaining Insulation and Useful Life Prediction Applications 5 Conclusions References Die Matching Performance of Ultra-Thin Titanium Sheet Driven by Polyurethane During Electromagnetic Forming 1 Introduction 2 Electromagnetic V Bending Experiment 2.1 Experimental Setup 2.2 Result 3 Finite Element and Performance Analysis 3.1 Simulation Model 3.2 Deformation Process 3.3 Contact Force and Velocity Analysis 3.4 Springback Analysis 4 Conclusions References Analysis of the End Electric Field of 66 kV Dry Transformer in Offshore Wind Power 1 Introduction 2 Simulation Methods 3 Results and Analysis 3.1 Electric Field Distribution at the End of the Transformer 3.2 Influence of Insulating Pad on the Electric Field at the End of Transformer 4 Conclusions References Research Status and Development Trend of Gravity Energy Storage Technology 1 Introduction 2 Data and Method 3 Development Trend of Gravity Energy Storage Technology 3.1 Analysis of Time Trend 3.2 Analysis of Countries and Regions 3.3 Analysis of Technology Research Trend 3.4 Analysis of Technology Application Trend 4 Conclusion References Research on Control Strategy of Permanent Magnet Synchronous Motor Speed Sensorless System Based on New Wide Band Gap Devices 1 Introduction 2 Mathematical Model of PMSM 3 Control Scheme for Speed Sensorless System 3.1 Initial Positioning 3.2 Improved High-Frequency Voltage Signal Injection Method at Low Speed 3.3 Optimized MRAS Algorithm at Medium to High Speeds 4 Simulation and Experiment 4.1 Verification of Initial Positioning Detection Method 4.2 Verification of Improved High-Frequency Voltage Signal Injection Method at Low Speed 4.3 Verification of Optimized MRAS Algorithm at Medium to High Speeds 5 Conclusion References Submodule Capacitance Dimensioning for Cascaded H-bridge STATCOM with Film Capacitors 1 Introduction 2 Analytical Expression of Capacitor Voltages and Branch Voltages 2.1 Time Expression of Branch Voltages and Capacitor Voltages with Sines and Cosines 2.2 Time Expression of Branch Voltages and Capacitor Voltages with the Tangent Function 3 Proposed Synthesis of SM Capacitance 4 Simulations and Experiments 5 Conclusion Appendix References Design of Electromagnetic Detection System for Underground Cultural Relics Protection Based on Spread Spectrum Coding 1 Introduction 2 Technical Principles 3 Design of Electromagnetic Detection System 4 System Experiments 5 Conclusion References Electric Field Analysis and Research of 1000 kV AC Transformers High Voltage Direct Type Exit Device 1 Introduction 2 Basic Parameter 3 Modeling and Evaluation Principle of Insulation Safety Margin 3.1 Mathematical Model 3.2 Establishment of Insulation Model 3.3 Software Verification 3.4 Evaluation Principle of Insulation Safety Margin 4 Software Verification in Direct Exit 4.1 The Electric Field Analysis Between High voltage Direct Exit Device and Turret Wall of Bushing 4.2 Electric Field Analysis Between High Voltage Horizontal Lead and Side Yoke and Tank 4.3 Electric Field Analysis Between high Voltage Exit Device and Side Yoke and Tank 4.4 Analysis of the Electric Field at the Elbow of the Exit Device 4.5 Electric Field Analysis at the Turn of the Exit Device 5 Conclusion References Analysis of Current and Voltage Characteristics of 500 kV Noninverting Parallel Cable 1 Introduction 2 Basic Cable Parameters 2.1 Phase Impedance Parameter Calculation 2.2 Phase Impedance Parameter Calculation 2.3 Phase Impedance Parameter Calculation 3 Basic Cable Parameters 3.1 Phase Impedance Parameter Calculation 3.2 Mathematical Model of Sequence Voltage and Sequence Current 3.3 Phase Impedance Parameter Calculation 3.4 Unbalanced 4 Basic Cable Parameters 5 Conclusion References Characteristic of the Power-Frequency Induced Current and the Corresponding Power Loss on the OPGW of 220 kV Overhead Line 1 Introduction 2 Calculation Model and Line Parameters 2.1 Typical Line Parameters and Model 2.2 Typical Tower Parameters 2.3 Line Operation Parameters 3 Analysis of Line Induced Current and Energy Loss 3.1 Induced Current Distribution Characteristics 3.2 Impact of the OPGW DC Resistance 3.3 Impact of Span 3.4 Impact of Phase Sequence 4 Conclusion References Construction and Application of Knowledge Graph in Electric Power Field 1 Introduction 2 Conceptualization and Construction of KG 2.1 The Concept of KG for Electric Power 2.2 The Construction of KG for Electric Power 3 Application of KG in EPF 3.1 Health Management of Electric Power Equipment 3.2 Fault Handling of Power Distribution Network 3.3 The Supervision and Transaction of Electric Power Market 4 Perspectives of KG in Electric Power Field 4.1 Data Quality 4.2 Knowledge Inference 4.3 Cross-Domain Knowledge Fusion 5 Conclusion References Study on Characteristic and Optimization of Eddy Current Damper Under Impact Load 1 Introduction 2 Structural Principle of Eddy Current Damper 3 Kinetic Model 3.1 Eddy Current Damping Force Model 3.2 Dynamic Model of Motion Part 4 Dynamic Characteristics Analysis of the Eddy Current Damper 4.1 Effect of Conductor Tube Material on the Eddy Current Damping Force 4.2 The Effect of the Conductor Tube Thickness on Eddy Current Damping Force 4.3 The Effect of the Air Gap on the Eddy Current Damping Force 5 Optimization Research on the Eddy Current Damper 6 Conclusion References SOH Prediction for Lithium-Ion Batteries Based on SSABP-MLR 1 Introduction 2 Battery HI Extraction 2.1 Battery Data Analysis 2.2 HI Selection Based on Charging Curves 2.3 HI Selection Based on Discharging Curves 2.4 HI Correlation Coefficient Evaluation and Selection 3 Combined Learning Model (SSABP-MLR) 4 Simulation Results and Analysis 4.1 SOH Prediction Results and Analysis 4.2 Generalization Testing 4.3 Conclusion References Integrated Design and Optimization of SSPC Current Measurement Module Based on AMR 1 Introduction 2 Principle of SSPC Current Detection Based on AMR Current Sensor 3 Integrated Design of SSPC Current Detection 4 Electromagnetic Problems for Integrated Optimization of SSPC Current Detection 5 Validation in SSPC Integrated Module Prototype 6 Conclusion References Multi-Vibration Sensor Fusion of Flexible DC Converter Transformer Based on Adaptive Extended Kalman Filter 1 Introduction 2 First Section 3 Verification 4 Conclusion References Parameter Identification of Retired Batteries Based on Improved Adaptive Particle Swarm Optimization 1 Introduction 2 Battery Model and Its Parameter Identification 2.1 Retired Power Battery Model 2.2 Model Parameters Identification 3 Particle Swarm Optimization Algorithm for Model Parameter Identification 3.1 Particle Swarm Optimization Algorithm for Model Parameter Identification 3.2 Improved Adaptive Particle Swarm Optimization Algorithm 4 Conclusion References A Bidirectional DC-DC Converter and Fast-GMPPT Algorithm for Photovoltaic Cells 1 Introduction 2 Proposed PV DC-DC Converter 2.1 Circuit Structure 2.2 Principle of Operation 3 Improved GMPPT Method Under GLBC 3.1 PV Array’s Output Characteristics Under GLBC 3.2 Proposed GMPPT Method Under GLBC 4 Experimental Results 5 Conclusion References Power Analysis and Experimental Study of Vortex-Excited Vibrating Ocean Current Energy Generation Based on a Cylindrical Permanent Magnet Linear Motor 1 Introduction 2 Working Principle of Vortex Vibration Current Energy Generation System 3 Cylindrical Permanent Magnet Linear Generator Finite Element Simulation 3.1 Three Different Magnetization Methods 3.2 Winding Form 3.3 Pole Slot Combination 4 Positioning Force Optimization and Load Characterization 4.1 Linear Motor Positioning Force Optimization 4.2 Load Characterization 5 Marine Experiment on Vortex Excitation Vibration Power Generation System 6 Conclusion References Research Review of Non-invasive Load Monitoring 1 Introduction 2 Non-invasive Load Monitoring Framework 3 Load State Types 3.1 Type of Load Characteristics 4 Existing Research Methods 4.1 Hidden Markov Model 4.2 Graph Signal Processing Model 4.3 Deep Learning Model 5 Summary and Prospect References Harmonic Coordination Suppression Strategy of Hybrid Grid-Connected System in Complex Grid Scenarios 1 Introduction 2 Analysis of Main Topology and Harmonic Mechanism of Hybrid Control Grid-Connected System 3 Coordinated Suppression Strategy of Voltage and Current Harmonics Based on MCCF 3.1 Harmonic Component Extraction Method Based on Multiple Complex Coefficient Filters 3.2 Voltage and Current Harmonic Coordination Suppression Strategy 4 Simulation Verification 5 Conclusion References Study on Partial Discharge Characteristics of Epoxy Resin Under Bipolar High-Frequency Square Wave Voltage 1 Introduction 2 Experiments and Result 2.1 Sample Preparation 2.2 Experimental Platform 3 High-Frequency Partial Discharge Detection and Signal Processing 4 The Influence This book gathers outstanding papers presented at the 18th Annual Conference of China Electrotechnical Society, organized by China Electrotechnical Society (CES), held in Nanchang, China, from September 15 to 17, 2023. 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