Chinese Journal of Electrical Engineering最新文献_第4页

Novel Self-adjusted Full-line Current Protection Strategy for Small Resistance Grounding Distribution Network 小电阻接地配电网自调整全线电流保护新策略

Chinese Journal of Electrical Engineering Pub Date : 2024-03-28 DOI: 10.23919/CJEE.2024.000062

Yabing Yan;Fei Ao;Huilin Liu;Biao Xu;Jinbo Wu;Hui Li;Yong Li;Sijia Hu

引用次数: 0

A Method for Suppressing Leakage Current of Non-isolated Integrated On-board EV Battery Charger 一种抑制非隔离集成车载电池充电器漏电流的方法

Chinese Journal of Electrical Engineering Pub Date : 2024-03-28 DOI: 10.23919/CJEE.2024.000072

Meng Shao;Qianfan Zhang;Zhen Wei;Hanlin Li

{"title":"A Method for Suppressing Leakage Current of Non-isolated Integrated On-board EV Battery Charger","authors":"Meng Shao;Qianfan Zhang;Zhen Wei;Hanlin Li","doi":"10.23919/CJEE.2024.000072","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000072","url":null,"abstract":"The integrated on-board battery chargers (IOBCs) can be used to repurpose the existing high-rated power electronic devices in electric vehicles (EVs) for charging, thereby cutting costs. However, non-isolated IOBCs face significant common-mode (CM) leakage currents owing to the lack of current isolation and coupling between the AC and DC side CM filters. A method that combines topology and modulation to suppress the CM leakage currents in a non-isolated integrated charger is proposed. The touch current can be suppressed below a reaction threshold of 1 MIU. This enhancement enables the safe usage and commercialization of transformer-less chargers, presenting superior charger efficiency, power density, and cost-effectiveness. The CM model of the proposed system is derived to guide the design of the circuit topology and modulation schemes. The simulation results are used to determine the feasibility of these techniques. Finally, a prototype of the 6.6 kW experimental charger is proposed, and the experimental results demonstrate the effectiveness of the proposed solution.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 4","pages":"47-59"},"PeriodicalIF":0.0,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10540372","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142918516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Model-Free Control of Permanent Magnet Synchronous Linear Motor Based on Ultra-local Model 基于超局部模型的永磁同步直线电机无模型控制

Chinese Journal of Electrical Engineering Pub Date : 2024-03-28 DOI: 10.23919/CJEE.2024.000050

Guangjing Su;Hongmei Li;Zheng Li;Yanan Zhou

引用次数: 0

Inherently Sinusoidal Single-Phase Voltage Source Inverter Based on Modified Cuk Cell 基于改进型 Cuk 电池的固有正弦单相电压源逆变器

Chinese Journal of Electrical Engineering Pub Date : 2024-03-01 DOI: 10.23919/CJEE.2024.000051

Misbahul Munir;Wisyahyadi;Arwindra Rizqiawan;Jihad Furqani

{"title":"Inherently Sinusoidal Single-Phase Voltage Source Inverter Based on Modified Cuk Cell","authors":"Misbahul Munir;Wisyahyadi;Arwindra Rizqiawan;Jihad Furqani","doi":"10.23919/CJEE.2024.000051","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000051","url":null,"abstract":"Renewable energy has become important for electricity generation because of the high air pollution associated with conventional fossil-based energy systems. Conventional fossil-based power plants are gradually transitioning by incorporating renewable energy sources, such as photovoltaic (PV) cells. In a PV system, an inverter converts DC power from solar panels to AC power required to serve common electrical loads. A conventional H-bridge inverter topology has several disadvantages, such as the voltage being not sinusoidal, switching the DC voltage and high common-mode voltage. The common-mode voltage can cause a large leaked capacitive current, which can result in undesirable operation in solar power applications. A common solution to this problem is the addition of a large filter to the input or output of an inverter. An inherent sinusoidal voltage source inverter based on a modified Cuk converter as its basic cell, which simultaneously generates a sinusoidal output voltage and a lower common-mode voltage, is proposed. The proposed topology does not require additional input or output filters. Analytical expressions are derived to confirm the operation of the proposed topology. Simulation results confirm the mathematical analysis. A laboratory-scale experiment is performed to verify the proposed inverter.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 1","pages":"114-123"},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10490168","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140345495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Erosion Characteristics of Oil-Immersed On-Load Tap Changer Contacts Under Varying Contact Speeds and Pressures 不同接触速度和压力下油浸式有载分接开关触头的腐蚀特性

Chinese Journal of Electrical Engineering Pub Date : 2024-03-01 DOI: 10.23919/CJEE.2023.000044

Zongying Li;Shuaibing Li;Yongqiang Kang;Zheng Li;Hongwei Li

{"title":"Erosion Characteristics of Oil-Immersed On-Load Tap Changer Contacts Under Varying Contact Speeds and Pressures","authors":"Zongying Li;Shuaibing Li;Yongqiang Kang;Zheng Li;Hongwei Li","doi":"10.23919/CJEE.2023.000044","DOIUrl":"https://doi.org/10.23919/CJEE.2023.000044","url":null,"abstract":"With the growing demand for precise voltage adjustment and reactive regulation, the frequent operation of on-load tap changers (OLTCs) in oil-immersed systems has led to increased erosion of switch contacts by arcs during the switching process. This erosion causes significant wear on the contacts, thereby reducing their lifespan. Therefore, the present study aims to investigate the behavior and mechanism of arc erosion on contact surfaces in oil-immersed OLTCs. To achieve this, a self-designed friction and wear test device for OLTC contacts was utilized to conduct experiments at various sliding speeds and contact pressures. Additionally, finite element analysis was employed to validate the experimental results regarding the influence of sliding speed on arc energy. The surface morphology of the contacts was observed using an optical microscope. The findings revealed that as the sliding speed increased, the arc energy, arc initiation rate, and contact resistance initially exhibited an upward trend, then decreased, and eventually increased again. The minimum values were observed at a sliding speed of 90 mm/s. Moreover, the arc energy, arc initiation rate, and contact resistance decreased gradually as the contact pressure increased. After reaching a contact pressure of 1.5 N, the variation in the arc energy stabilized. At lower contact pressures, arc erosion dominated the wear on the contact surface. However, at higher contact pressures, the wear transitioned from predominantly arc erosion to a combination of mechanical wear and arc erosion. In summary, experimental and analytical investigations provided insights into the effects of sliding speed and contact pressure on the behavior of arc erosion, contact resistance, and surface damage of OLTC contacts in oil-immersed systems.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 1","pages":"21-34"},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10490172","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140345460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Editorial for the Special Issue on Emerging Technology and Advanced Application of Nondestructive Detection for Power Equipment 为 "电力设备无损检测的新兴技术和先进应用 "特刊撰写的编辑文章

Chinese Journal of Electrical Engineering Pub Date : 2024-03-01 DOI: 10.23919/CJEE.2024.000055

引用次数: 0

FEA-based Geometrical Modification of Switched Reluctance Motor for Radial Force Reduction 基于有限元分析的开关磁阻电机几何改型可降低径向力

Chinese Journal of Electrical Engineering Pub Date : 2024-03-01 DOI: 10.23919/CJEE.2024.000049

Rani S;Jayapragash R

{"title":"FEA-based Geometrical Modification of Switched Reluctance Motor for Radial Force Reduction","authors":"Rani S;Jayapragash R","doi":"10.23919/CJEE.2024.000049","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000049","url":null,"abstract":"Switched reluctance motors (SRMs) are becoming increasingly popular in the automotive sector owing to their robust design. Moreover, SRMs are preferred particularly for EV applications owing to their fault tolerance, magnet-free structure, and high power/torque density. The main concerns of SRM compared to other machines include torque ripple and vibration. The primary cause of vibration is the radial force created by the SRM. A geometry-based modification of the SRM to reduce the radial force without significantly changing the average torque produced is proposed. The primary goal is to design a 4-phase, 8/6 SRM with a lower radial force. Two possible geometrical alterations are proposed: one with square windows and the other with circular holes on the rotor core. The windows are sized and positioned to avoid flux saturation. General criteria are developed for the optimal window size and placement. Finite element analysis (FEA) modelling of the SRM is used to validate its performance. The FEA results are compared with the performance parameters obtained using the analytical method. Utilizes the multiphysics design tool ANSYS to obtain the natural frequencies and associated deformations through modal analysis. Compared to the conventional geometry, the radial force is significantly reduced by providing windows.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 1","pages":"124-135"},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10490166","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140345480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulation of Ultrasonic Propagation in Transformers within Thermal Fields and Intelligent Methodology for Hot-Spot Temperature Recognition 热场中变压器内超声波传播模拟及热点温度识别智能方法

Chinese Journal of Electrical Engineering Pub Date : 2024-03-01 DOI: 10.23919/CJEE.2024.000052

Dongxin He;Dechao Yang;Xinhua Guo;Jiefeng Liu;Haoxin Guo;Qingquan Li;Gilbert Teyssedre

{"title":"Simulation of Ultrasonic Propagation in Transformers within Thermal Fields and Intelligent Methodology for Hot-Spot Temperature Recognition","authors":"Dongxin He;Dechao Yang;Xinhua Guo;Jiefeng Liu;Haoxin Guo;Qingquan Li;Gilbert Teyssedre","doi":"10.23919/CJEE.2024.000052","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000052","url":null,"abstract":"Hot-spot temperature of transformer windings is a crucial indicator of internal defects. However, current methods for measuring the hot-spot temperature of transformers do not apply to those already in operation and suffer from data lag. This study introduces a novel inversion method that combines ultrasonic sensing technology, multiphysics simulation, and the K-nearest neighbors algorithm. Leveraging the penetrative ability and temperature sensitivity of ultrasonic sensing, a detailed physical field simulation model was established. This study extensively investigates the characteristics of ultrasonic wave signals inside transformers. The investigation includes different temperature fields, ranging from 40 °C to 110 °C at 10 °C intervals, and various ultrasonic wave emitter conditions. By extracting the key features of the acoustic signals, such as the peak time, propagation time, and peak amplitude, an accurate inversion of the winding hot-spot temperature is successfully achieved. The results demonstrate that this method achieves a high accuracy rate (98.57%) in inverting the internal winding hot-spot temperatures of transformers, offering an efficient and reliable new approach for measuring winding hot-spot temperatures.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 1","pages":"35-47"},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10490167","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140345522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advanced Electrical Motors and Control Strategies for High-quality Servo Systems - A Comprehensive Review 用于高质量伺服系统的先进电机和控制策略 - 全面回顾

Chinese Journal of Electrical Engineering Pub Date : 2024-03-01 DOI: 10.23919/CJEE.2023.000048

Ming Cheng;Jiawei Zhou;Wei Qian;Bo Wang;Chenchen Zhao;Peng Han

引用次数: 0

Characterization of Electrical Tree Degradation of Epoxy Resin under Thermal and Temperature Stresses by Photoelastic Effect 利用光弹性效应表征环氧树脂在热应力和温度应力下的电树降解特性

Chinese Journal of Electrical Engineering Pub Date : 2024-03-01 DOI: 10.23919/CJEE.2023.000047

Hein Htet Aung;Yuhuai Wang;Jin Li;Ying Zhang;Tatsuo Takada

{"title":"Characterization of Electrical Tree Degradation of Epoxy Resin under Thermal and Temperature Stresses by Photoelastic Effect","authors":"Hein Htet Aung;Yuhuai Wang;Jin Li;Ying Zhang;Tatsuo Takada","doi":"10.23919/CJEE.2023.000047","DOIUrl":"https://doi.org/10.23919/CJEE.2023.000047","url":null,"abstract":"Epoxy resin is widely used in the support, insulation, and packaging components of electrical equipment owing to their excellent insulation, thermal, and mechanical properties. However, epoxy-resin insulation often suffers from thermal and mechanical stresses under extreme environmental conditions and a compact design, which can induce electrical tree degradation and insulation failure in electrical equipment. In this study, the photoelastic method is employed to investigate the thermal-mechanical coupling stress dependence of the electrical treeing behavior of epoxy resin. Typical electrical tree growth morphology and stress distribution were observed using the photoelastic method. The correlation between the tree length and overall accumulated damage with an increase in mechanical stress is determined. The results show that compressive stress retards the growth of electrical trees along the electric field, while tensile stress has accelerating effects. This proves that the presence of thermal stress can induce more severe accumulated damage.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 1","pages":"12-20"},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10490171","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140345498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0