B. M. Manjunatha;A. Suresh Kumar;S. Nagaraja Rao;Kiran Kumar B. M.
{"title":"TSKFC-DTC of Five Phase Induction Motor with Five-Level Aligned Multilevel Inverter","authors":"B. M. Manjunatha;A. Suresh Kumar;S. Nagaraja Rao;Kiran Kumar B. M.","doi":"10.23919/CJEE.2026.000003","DOIUrl":"https://doi.org/10.23919/CJEE.2026.000003","url":null,"abstract":"Development of an appropriate control methodology for the operation of a five-phase induction motor (FPIM) in an electric drive system is of great importance. Among the various controller options, direct torque control (DTC) is a well-known technique that enables the achievement of motor torque with minimal fluctuations. Additionally, Takagi-Sugeno-Kang fuzzy controllers (TSKFCs) can provide rapid responses when confronted with sudden input variations. Hence, this paper presents a TSKF-DTC-based scheme for an FPIM drive. Furthermore, a five-level aligned multilevel inverter (AMI) is employed to achieve accurate results with reduced fluctuations in the electromagnetic torque. AMI facilitates a smaller number of switches compared to the other configurations. Additionally, the space-vector modulation method is employed to generate the correct pulse sequence for a five-phase/leg inverter, enabling the motor to operate. Two TSKFCs are utilized on the FPIM DTC to ensure precise control of the flux and torque. To provide a clearer visual representation, the responses of the proposed TSKF-based DTC for an FPIM are compared with those of a 3-phase motor. Initially, the proposed technique is simulated and tested using the OPAL-RT platform to derive the results through hardware-in-the-loop testing.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"12 2","pages":"248-256"},"PeriodicalIF":4.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11603284","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148443377","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}
Fan Zhang;Jianlin Tang;Bin Qian;Yong Xiao;Xiaoming Lin;Xiangyong Feng
{"title":"V2G Charging Stations: A Comprehensive Review of Technology and Infrastructure","authors":"Fan Zhang;Jianlin Tang;Bin Qian;Yong Xiao;Xiaoming Lin;Xiangyong Feng","doi":"10.23919/CJEE.2025.000155","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000155","url":null,"abstract":"With the large-scale popularization of electric vehicles (EVs), the structures of traditional power systems are undergoing profound changes, driving the development of vehicle-to-grid (V2G) technology, which enables bidirectional interaction between EVs and power grids. As a key infrastructure for implementing V2G functions, V2G charging piles not only provide energy replenishment but also have the potential to support grid operation as distributed energy-storage units. This paper systematically reviews the research progress and current technological status of V2G charging piles. Starting from the basic concepts and system architecture of V2G, this paper examines its working mechanism, key technical components, communication protocols, and integration methods with smart grids. Subsequently, the current development status of V2G charging piles is reviewed, including typical demonstration projects, market applications, and commercialization paths. The typical applications and values of V2G in grid frequency and peak regulation, distributed energy coordination, demand response, and electricity price arbitrage are explored. This paper also deeply analyzes the main challenges currently faced, including charging and discharging control strategies, battery life impacts, security and standardization issues, and policy barriers.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"12 2","pages":"45-65"},"PeriodicalIF":4.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11373446","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148443403","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}
Wentao Zhang;Haoyu Zhang;Yongxiang Xu;Huidong Huang;Lisi Tian;Jibin Zou;Lei Zhang;Yuqiang Liu
{"title":"Improved-Variable Virtual Space Vector Modulation Scheme for Three-Level Inverter in Unbalanced Neutral-Point Voltage Conditions","authors":"Wentao Zhang;Haoyu Zhang;Yongxiang Xu;Huidong Huang;Lisi Tian;Jibin Zou;Lei Zhang;Yuqiang Liu","doi":"10.23919/CJEE.2025.000157","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000157","url":null,"abstract":"This study proposes an improved-variable virtual space vector modulation scheme to enhance the neutral-point voltage (NPV) balancing capability at a high modulation index for a three-level inverter with unbalanced neutral-point voltage conditions. First, to simplify the calculation, the 60° g-h coordinate system is used and the spatial coordinates of each vector are given when the NPV is unbalanced; the imbalance factor <tex>$zeta$</tex> is also introduced to make the voltage synthesis more accurate and ensure a good quality of output current. Subsequently, by analyzing the relationship between the space vectors, a virtual vector of equal size and direction is found for the basic center vector, which can form a pair of redundant states with the basic center vector. The NPV can be adjusted by introducing a medium-vector balance factor to regulate the action time of the pair of redundant states. The proposed method simultaneously considers the small vector balance factor, variable virtual vector adjustment factor, and newly proposed medium vector balance factor to accelerate the NPV adjustment speed, eliminate periodic fluctuations caused by over-adjustment, and ensure a stable output current under NPV imbalance conditions. Simulation and experimental results validate the feasibility of this approach.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"12 2","pages":"83-98"},"PeriodicalIF":4.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11302061","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148451997","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}
Fengyu Shen;Lei Huang;Yuan Li;Minshuo Chen;Minqiang Hu
{"title":"Design Optimization and Manufacturing of High-Performance MLS for WEC","authors":"Fengyu Shen;Lei Huang;Yuan Li;Minshuo Chen;Minqiang Hu","doi":"10.23919/CJEE.2026.000041","DOIUrl":"https://doi.org/10.23919/CJEE.2026.000041","url":null,"abstract":"Wave energy is a promising renewable resource, requiring efficient mechanisms for energy conversion. The magnetic lead screw (MLS), functioning as a trans-rotary magnetic gear, offers a robust, contact-free actuation solution characterized by high thrust force density, inherent overload protection, and environmental benefits. These qualities make it well-suited for wave energy conversion (WEC) systems. Among various MLS configurations, the conventional permanent magnet (PM) type is widely adopted for its high efficiency and simpler structure. However, due to its complex geometry and high cost, the manufacturing of helical PMs faces challenges. The design optimization of the MLS is investigated and an innovative oblique cutting method is introduced for helical PM manufacturing. Compared to the conventional approach, this proposed method not only enhances manufacturing efficiency, but also improves the material utilization rate of PMs, minimizing waste as much as possible. This article provides design guidance for high-performance magnetic transmission devices in WEC systems, offering significant engineering application value.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"12 2","pages":"197-209"},"PeriodicalIF":4.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11535593","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148443302","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}
{"title":"Stability-Enhancing Single-Vector Control of Interior Permanent Magnet Synchronous Motor Based on Backstepping Control","authors":"Yang Yu;Qianhui Zhang;Zongzhe Yu","doi":"10.23919/CJEE.2025.000172","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000172","url":null,"abstract":"To address the limitations of traditional single-vector control for interior permanent-magnet synchronous motors (IPMSMs), notably computational complexity and poor stability, a stability-enhancing single-vector control strategy is proposed. A mathematical model of the IPMSM is first established using the <tex>$dq0$</tex> coordinate system. Based on the maximum torque per ampere (MTPA) strategy, the relationship between the <tex>$d$</tex> -axis and <tex>$q$</tex> -axis currents is determined, followed by the design of a backstepping controller for the IPMSM. It is demonstrated that a stable fundamental voltage vector exists within each sector. A method for selecting the optimal fundamental voltage vector is introduced, simplifying the process by comparing the derivatives of the Lyapunov function corresponding to candidate voltage vectors. The proposed control strategy is validated through both simulations and experiments. Results indicate that the method exhibits strong robustness. Compared with traditional model predictive current control (MPCC), the proposed strategy achieves improved stability, reduced output fluctuations in both speed and current, and effective tracking of the motor's state variables.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"12 1","pages":"320-332"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11476977","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148518689","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}
{"title":"Research on Wayside Energy Storage Control Strategy for Urban Rail Transit Based on Double Fuzzy Droop Control","authors":"Feng Zhao;Huaxuan Xiao;Xiaoqiang Chen;Ying Wang;Zhanning Chang","doi":"10.23919/CJEE.2025.000173","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000173","url":null,"abstract":"Urban rail transit energy storage technology can improve the energy utilization rate of trains by absorbing regenerative braking energy on a large scale. Additionally, it can promote the consumption of nearby renewable energy sources, expand the multiple energy supply of rail transit, and form a highly efficient and coordinated energy management system encompassing “source, network, storage and vehicle”. Trains absorb or release electric energy from the 1 500 V traction network of urban rail transit during operation, leading to drastic traction network pressure fluctuations that can exceed the safety threshold range and affect travel safety. Therefore, a double fuzzy droop control (DFDC) strategy is proposed in this paper to solve the traction network pressure fluctuation problem. First, the train power is decomposed into high-and low-frequency power using a filtering method. Fuzzy rules are combined with the urban rail traction network voltage and decomposed power, to fuzzify the voltage compensation factor and droop coefficient, to obtain a complete energy storage control strategy. Second, light storage management is coordinated, combining it with the energy management strategy. Train operations under different working conditions are compared with traditional control and the proposed strategy, using Matlab/Simulink to verify the rationality and feasibility of the proposed strategy. The simulation results show that the proposed approach can improve the utilization rate of photovoltaics (PV) and storage, effectively reducing the voltage fluctuation of the traction network bus.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"12 1","pages":"344-354"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11476976","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148518693","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}
Junming Xu;Wenxiang Zhao;Yunhan Zhou;Yuhua Sun;Jinghua Ji
{"title":"Vibration Suppression of Fractional-Slot Distributed Winding PMSMs Considering Radial Force Modulation Effect","authors":"Junming Xu;Wenxiang Zhao;Yunhan Zhou;Yuhua Sun;Jinghua Ji","doi":"10.23919/CJEE.2024.000086","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000086","url":null,"abstract":"A new vibration suppression method for a fractional-slot distributed winding permanent magnet synchronous machine (FSDW-PMSM) is proposed by considering the influence of the radial force modulation effect on FSDW-PMSMs. First, the vibration source of the FSDW-PMSMs is analyzed, and the principle of radial force modulation is revealed. Afterwards, the radial force distribution characteristics are studied, and the radial force component that contributes to the dominant vibration is identified. The PM flux density harmonics in the air gap are suppressed using the harmonic injection method to reduce vibrations. Additionally, dual three-phase techniques are used to enhance the fundamental armature flux density, thereby improving torque capability. Consequently, the vibration performance of the FSDW-PMSM is improved without sacrificing the torque. Finally, the proposed method is validated through simulations and experiments.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"12 1","pages":"296-305"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11476841","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148518688","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}
Man Chen;Peng Peng;Wanzhou Sun;Chenxu Wang;Ruixin Yang
{"title":"Multi-Observation Fusion Method for Predicting the Remaining Useful Life of Lithium-Ion Batteries","authors":"Man Chen;Peng Peng;Wanzhou Sun;Chenxu Wang;Ruixin Yang","doi":"10.23919/CJEE.2025.000151","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000151","url":null,"abstract":"A major challenge in ensuring the reliability of battery systems is the uncertainty surrounding their service life. An accurate prediction of the remaining useful life (RUL) is essential for effective maintenance and operation. Traditional extended Kalman filter (EKF) algorithms, which rely heavily on historical data, often have limited long-term prediction accuracy. To overcome this problem, a multi-observation fusion approach is proposed to enhance the performance of the EKF for battery life prediction. To improve the practical applicability, the conventional aging capacity test values with operational capacity data obtained under real-world conditions are replaced. This modification refined the trajectory of the battery aging state space, thereby reducing the dependency on the quantity and quality of historical data while simultaneously boosting the long-term prediction accuracy and stability. Furthermore, a semi-empirical aging model is introduced to extract prior knowledge from offline data. This provided valuable insights into the life degradation trends and guided the filtering process. The resulting framework forms the basis for a novel RUL prediction method that utilizes a multi-observation fusion EKF. Validation experiments show that the proposed method enhanced the prediction accuracy by over 60% compared with traditional EKF and particle filter algorithms throughout the lifecycle of lithium-ion batteries. Additionally, the technique exhibited robust stability (with no divergence observed over the full battery life) and demonstrated notable improvements in early stage RUL prediction.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"12 1","pages":"23-33"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11207180","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148519292","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}
Min Liu;Yubo Wang;Fan Yang;Xiangjin Wang;Lingxiao Ye;Nawei Lyu;Yang Jin
{"title":"Online Monitoring Method for the Overall Safety Status of Battery Packs Based on Electrochemical Impedance","authors":"Min Liu;Yubo Wang;Fan Yang;Xiangjin Wang;Lingxiao Ye;Nawei Lyu;Yang Jin","doi":"10.23919/CJEE.2026.000026","DOIUrl":"https://doi.org/10.23919/CJEE.2026.000026","url":null,"abstract":"A safety-monitoring method based on the overall impedance of a battery pack is investigated to address the inefficiency and invasiveness of traditional disassembly based cell impedance measurements. By measuring the impedance values of individual cells via the AC injection method and conducting a superposition analysis, the relationship between the overall pack impedance and electrochemical states of the individual cells is established. An online measurement method for the overall impedance is developed, incorporating a weighted scoring system for the characteristic frequency points and local overcharge warning method based on the optimal single frequency point. Experimental results using a <tex>$280 mathrm{A}cdot mathrm{h}$</tex> 1P16S lithium iron phosphate battery showed that the overall impedance effectively reflects individual cell characteristics under normal operating conditions and accurately inherits high-frequency impedance features during overcharge. The weighted scoring system identified 700 Hz as the optimal characteristic frequency, enabling a warning approximately 3 min earlier than those of traditional voltage-based methods. This noninvasive online impedance detection approach provides a new solution for early intervention to prevent the overcharging of battery energy storage systems.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"12 1","pages":"34-49"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11476835","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148519293","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}
{"title":"Nondestructive Lithium-Plating Detection Based on Reversible Lithium Reintercalation in Lithium-ion Batteries","authors":"Hongchang Cai;Kai Yang;Yunfeng Huang;Zhecheng Fan;Yilin Lai;Jian Mei;Yong Peng;Xuning Feng","doi":"10.23919/CJEE.2026.000016","DOIUrl":"https://doi.org/10.23919/CJEE.2026.000016","url":null,"abstract":"Lithium plating in lithium-ion batteries can cause critical safety and performance issues, including internal short circuits, severe capacity degradation, and reduced thermal stability. Developing efficient detection methods is imperative to mitigate the safety risks associated with lithium plating. However, most advanced detection techniques require destructive battery disassembly, whereas existing nondestructive approaches often involve extended detection times or have limited practical applicability. To address these challenges, a nondestructive lithium-plating detection method based on the reversible lithium reintercalation mechanism is proposed. This method extracts the direct current internal resistance during the rest phase of pulse charging as a key feature, normalizes this feature, and applies clustering algorithms for nondestructive identification. Experimental analysis of large-format cells, together with post-mortem validation, confirms the effectiveness of the proposed approach. With applicability across wide temperature ranges and diverse current conditions, and relying only on readily obtainable features, this approach enables nondestructive lithium-plating detection and significantly enhances the operational safety and stability of batteries.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"12 1","pages":"93-106"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11476986","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148519294","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}