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Subsequent Commutation Failure Suppression Considering Negative-sequence Voltage Caused by Symmetrical Fault at AC Side of Inverter 认领 引用 被引量：1
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作者 Shenghu Li Yikai Li 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2025年第2期720-731,共12页
The negative-sequence voltage is often caused by the asymmetrical fault in the AC system,as well as the harmonics after the symmetrical fault at the AC side of inverter in line commutated converter based high-voltage ... The negative-sequence voltage is often caused by the asymmetrical fault in the AC system,as well as the harmonics after the symmetrical fault at the AC side of inverter in line commutated converter based high-voltage DC(LCC-HVDC).The negative-sequence voltage affects the phase-locked loop(PLL)and the inverter control,thus the inverter is vulnerable to the subsequent commutation failure(SCF).In this paper,the analytical expression of the negative-sequence voltage resulting from the symmetrical fault with the commutation voltage is derived using the switching function and Fourier decomposition.The analytical expressions of the outputs of the PLL and inverter control with respect to time are derived to quantify the contribution of the negative-sequence voltage to the SCF.To deal with the AC component of the input signals in the PLL and the inverter control due to the negative-sequence voltage,the existing proportional-integral controls of the PLL,constant current control,and constant extinction angle control are replaced by the linear active disturbance rejection control against the SCF.Simulation results verify the contributing factors to the SCF.The proposed control reduces the risk of SCF and improves the recovery speed of the system under different fault conditions. 展开更多
关键词 Line commutated converter high-voltage direct current subsequent commutation failure negative-sequence voltage inverter control phase-locked loop(PLL) linear active disturbance rejection control(LADRC).
Effect of Voltage Frequency on the Formation of Electric Damage on Bearing Outer Race 认领 引用 被引量：1
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作者 REN Yulong SONG Chenfei +4 位作者 HUANG Qirui PANG Xianjuan LU Huanhuan JI Xinkuo ZHANG Yongzhen 《摩擦学学报（中英文）》 EI CAS CSCD 北大核心 2026年第1期56-69,共14页
Electrical erosion in high-frequency alternating current(AC)electric fields is the main failure mode of traction motor bearings in fields such as new-energy vehicles.The electrical damage on the outer race of bearings... Electrical erosion in high-frequency alternating current(AC)electric fields is the main failure mode of traction motor bearings in fields such as new-energy vehicles.The electrical damage on the outer race of bearings was produced from direct current(DC)to 1 MHz AC condition.The average friction coefficient increased from 0.019 to 0.097 and then decreased to 0.052.The equivalent contact resistance decreased to its minimum at 0.99Ωthen rose to 2.6Ω.Three electric erosion morphologies were observed:pitting under DC and low frequency,fluting under resonance frequency(1 kHz)and frosting under high frequency.It was speculated that the frequency may affect the number of charge-discharge cycles of the bearing capacitance.This further affected the energy density of the bearing breakdown together with the current density,ultimately affecting the morphology of electrical corrosion. 展开更多
关键词 electric erosion high-frequency shaft voltage bearing current density
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Koopman-WNN Based MPC for Hierarchical Optimal Voltage and Network Power Loss Control in ADNs 认领 引用
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作者 Wenfei Yi Mingzhong Zheng +2 位作者 Jiayi Wang Hao Yang Zhenglong Sun 《Energy Engineering》 EI 2026年第4期52-73,共22页
With the growing integration of renewable energy sources(RESs)and smart interconnected devices,conventional distribution networks have turned to active distribution networks(ADNs)with complex system model and power fl... With the growing integration of renewable energy sources(RESs)and smart interconnected devices,conventional distribution networks have turned to active distribution networks(ADNs)with complex system model and power flow dynamics.The rapid fluctuation of RES power may easily result in frequent voltage violation issues.Taking the flexible RES reactive power as control variables,this paper proposes a two-layer control scheme with Koopman wide neural network(WNN)based model predictive control(MPC)method for optimal voltage regulation and network loss reduction.Based on Koopman operator theory,a data-driven WNN method is presented to fit a high-dimensional linear model of power flow.With the model,voltage and network loss sensitivities are computed analytically,and utilized for ADN partition and control model formulation.In the lower level,a dual-mode adaptive switching MPC strategy is put forward for optimal voltage control and network loss optimization in each individual partition to decide the RES reactive power.The upper level is to calculate the adjustment coefficients of the RES reactive power given in the low level by taking the coupling effects of different partitions into account,and then the final reactive power dispatches of RESs are obtained to realize optimal control of voltage and network loss.Simulation results on two ADNs demonstrate that the proposed strategy can reliably maintain the voltage at each node within the secure range,reduce network power losses,and enhance the overall system security and economic efficiency. 展开更多
关键词 Active distribution network voltage violations Koopman operator voltage regulation network loss optimization hierarchical model predictive control
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Transient Voltage Control for AC-DC Hybrid Power System Based on ISAO-CNN-BiGRU 认领 引用
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作者 Xueting Cheng Rui Xu +3 位作者 Liming Bo Cheng Liu Huiping Zheng Zhichong Cao 《Energy Engineering》 EI 2026年第4期214-246,共33页
To address the issue of transient low-voltage instability in AC-DC hybrid power systems following large disturbances,conventional voltage assessment and control strategies typically adopt a sequential“assess-then-act... To address the issue of transient low-voltage instability in AC-DC hybrid power systems following large disturbances,conventional voltage assessment and control strategies typically adopt a sequential“assess-then-act”paradigm,which struggles to simultaneously meet the requirements for both high accuracy and rapid response.This paper proposes a transient voltage assessment and control method based on a hybrid neural network incorporated with an improved snow ablation optimization(ISAO)algorithm.The core innovation of the proposed method lies in constructing an intelligent“physics-informed and neural network-integrated”framework,which achieves the integration of stability assessment and control strategy generation.Firstly,to construct a highly correlated input set,response characteristics reflecting the system’s voltage stable/unstable states are screened.Simultaneously,the transient voltage severity index(TVSI)is introduced as a comprehensive metric to quantify the system’s post-disturbance transient voltage performance.Furthermore,the load bus voltage sensitivity index(LVSI)is defined as the ratio of the voltage change magnitude at a load node(or bus)to the change in the system-level TVSI,thereby pinpointing the response characteristics of critical load nodes.Secondly,both the transient voltage stability assessment result and its corresponding under-voltage load shedding(UVLS)control amount are jointly utilized as the outputs of the response-driven model.Subsequently,the snow ablation optimization(SAO)algorithm is enhanced using a good point set strategy and a Gaussian mutation strategy.This improved algorithm is then employed to optimize the key hyperparameters of the hybrid neural network.Finally,the superiority of the proposed method is validated on a modified CEPRI-36 system and an actual power grid case.Comparisons with various artificial intelligence methods demonstrate its significant advantages in model speed and accuracy.Additionally,when compared to traditional emergency control schemes and UVLS strategies,the proposed method exhibits exceptional rapidness and real-time capability in control decision-making. 展开更多
关键词 Transient voltage stability voltage control AC-DC hybrid power system improved snow ablation optimization hybrid neural network
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Boosting Piezoelectric Voltage Constant in 3D-Interconnected PZNNT Porous Piezoceramics via Pore Architecture Engineering 认领 引用
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作者 Xiaoying Feng Jie Xu +5 位作者 Chenhe Xia Xinyue Tang Ziyao Wei Mupeng Zheng Yudong Hou Feng Gao 《Rare Metals》 SCIE EI CAS CSCD 2026年第3期430-441,共12页
In conventional piezoceramics,the coordinated change between the dielectric constant(εr)and the piezoelectric charge constant(d33)usually limits the piezoelectric voltage constant g33(g33=d33/εr),a... In conventional piezoceramics,the coordinated change between the dielectric constant(εr)and the piezoelectric charge constant(d33)usually limits the piezoelectric voltage constant g33(g33=d33/εr),a critical figure of merit for piezoelectric sensors.In porous piezoceramics(PPCs),air as a secondary phase reduces εr,whereas controlling 3-dimensional(3D)pore structure through processing can enhance ceramic skeleton connectivity,thereby benefiting d33and enabling the decoupling of electrical parameters.In this work,we fabricate PPCs of PZT-PZN-PNN(PZNNT)via the gel-casting method with varying solid contents.The 5-vol%PZNNT 3D-PPC realizes an 84.5%sharp reduction in εrand a 55.2%retention of d33that synergistically elevates g33to 99.7×10-3Vm N-1,which is 3.7 times that of dense ceramic.Experimental and simulation results confirm that the low stiffness and large deformations of porous materials enable both stress absorption and amplification,thereby enhancing the electromechanical conversion efficiency of piezoelectric materials.Ultimately,the fabricated 3D porous piezoceramic demonstrates exceptional electrical output and sensitivity,whereas its low density and acoustic impedance synergistically position it as a highly competitive candidate for hydrophone and sensor applications. 展开更多
关键词 gel-casting piezoelectric sensor piezoelectric voltage constant porous piezoceramics sensitivity
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Engineering dual-salt hybrid-solvation electrolytes with moderate coordination enabling low-temperature kinetics and high-voltage stability in lithium batteries 认领 引用
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作者 Jiayue Peng Yuwei Li +3 位作者 Canfu Zhang Saisai Qiu Shijie Cheng Jia Xie 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第5期566-577,I0014,共12页
The widespread adoption of lithium-metal batteries(LMBs)faces a critical challenge:the absence of electrolytes that can simultaneously withstand low-temperature and high-voltage operating conditions.To address this fu... The widespread adoption of lithium-metal batteries(LMBs)faces a critical challenge:the absence of electrolytes that can simultaneously withstand low-temperature and high-voltage operating conditions.To address this fundamental limitation,we introduce a mechanistically guided electrolyte design strategy based on a molecularly engineered hybrid-solvation structure combined with a synergistic dual-salt system.Our approach uniquely employs a fluorinated solvent mixture—comprising fluoroethylene carbonate(FEC)and moderately coordinating fluorinated ethyl acetate(TFEA)—to reconfigure the Li+solvation environment.This tailored solvation sheath facilitates anion participation and achieves an optimal balance between contact ion pairs(CIP)and aggregates(AGG),thereby significantly lowering the Li+desolvation energy barrier.Furthermore,the incorporation of a LiFSI-LiClO4dual-salt formulation works in concert to construct highly conductive LiF-rich interphases on both electrodes:a stable solidelectrolyte interphase(SEI)on the Li anode and a robust cathode-electrolyte interphase(CEI)under high voltages.As a result,Li||NCM811 cells exhibit excellent cycling stability from room temperature to-20℃,together with high capacity retention at high discharge rates(up to 3 C)under a moderate charging rate(0.5 C)and stable operation up to 4.7 V,substantially outperforming conventional single-salt electrolytes.This work establishes a transferrable solvation-interphase design paradigm that links coordination chemistry to interfacial stability,advancing LMBs toward practical,high-energy,widetemperature deployment. 展开更多
关键词 Lithium metal batteries Hybrid-solvation structure Dual-salt electrolyte High voltage Low temperature
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Synergistic Engineering of Amorphous Cathode and Hybrid Electrolyte Toward Stable High-Voltage Aqueous Zn-Ion Batteries 认领 引用
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作者 Xianyu Liu Yihong Huang +5 位作者 Rui Xu Enjie Hu Xiangcheng Dong Xinyu Wang Hongmei Cao Baojuan Xi 《Rare Metals》 SCIE EI CAS CSCD 2026年第5期784-793,共10页
The development of high-voltage aqueous zinc-ion batteries(AZIBs)is primarily hindered by the lack of suitable cathode materials and electrolytes that can work in broad voltage windows.Herein,we propose a synergistic ... The development of high-voltage aqueous zinc-ion batteries(AZIBs)is primarily hindered by the lack of suitable cathode materials and electrolytes that can work in broad voltage windows.Herein,we propose a synergistic strategy that concurrently addresses these challenges through the integration of an amorphous vanadium oxyphosphate/graphene(A-VOP/G)cathode with a propylene carbonate(PC)-based hybrid electrolyte.Notably,the amorphous framework of A-VOP provides abundant ion transfer pathways and enhanced structural flexibility,whereas the graphene scaffold ensures high electronic conductivity and suppresses material agglomeration.Moreover,mechanistic studies reveal that the PC co-solvent participates in the Zn2+solvation sheath,which significantly mitigates water-induced side reactions.Simultaneously,the introduction of PC components effectively disrupts the hydrogen-bond network of water,thereby suppressing parasitic reactions and broadening the electrochemical stability window.As a result,the A-VOP/G cathode in the optimized hybrid electrolyte delivers a high discharge capacity of 159.6 mAh g-1 at 1 A g-1,an elevated operating voltage of 1.43 V,and remarkable cycling stability.This work demonstrates the profound potential of integrated cathode and electrolyte design in developing stable high-voltage AZIBs. 展开更多
关键词 amorphous cathode aqueous zinc-ion batteries cycling stability high voltage hybrid electrolyte
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Distribution Network Partitioning and Distributed Voltage Coordinated Optimization Method under High-Proportion Photovoltaic Penetration 认领 引用
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作者 Jian Wang Gongqiang Yang +2 位作者 Yufeng Sun Gangui Yan Jie Long 《Energy Engineering》 EI 2026年第6期410-442,共33页
Given that the power grid partitioning method relying mainly on line reactive power flow information sees frequent changes in partitioning results with reactive power flow fluctuations under high-proportion fixed-powe... Given that the power grid partitioning method relying mainly on line reactive power flow information sees frequent changes in partitioning results with reactive power flow fluctuations under high-proportion fixed-powerfactor PV-connected distribution networks,and traditional distributed PV collaborative optimization fails to adapt due to such changes,a stable partitioning and distributed PV collaborative optimization method for this scenario is proposed.Firstly,the Gaussian mixture model(GMM)is used to characterize the characteristics of PV reactive power output,obtaining the typical curve of PV reactive power output.Secondly,the Monte Carlo Simulation(MCS)probabilistic power flow calculation is performed to obtain the node voltage distribution of the distribution network.Thirdly,based on the node voltage distribution,the Earth Mover’s Distance(EMD)is used to obtain the statistical distance between any two nodes,and this statistical distance is combined with the electrical distance defined by node voltage sensitivity to form a comprehensive electrical distance.Then,the affinity propagation clustering algorithm is applied,and considering the dynamic reactive power margin requirement,the reactive power/voltage partitioning result is obtained.Based on the reactive power partitioning result,a reactive power optimization model is established with the minimum active power loss of the system as the objective function.The optimization model is convexified using the LinDistFlow equation,and the Alternating Direction Multiplier Method(ADMM)is adopted to coordinate the reactive power output of PV inverters in each partition,achieving global optimal voltage control in the distribution network.Finally,the proposed method is verified using the IEEE 33-bus system.The application of this method reduces the system power loss by 35.94%.Compared with the traditional partitioning method,the partitioning variation rate under Scenario 1 is reduced by 54.17%and that under Scenario 2 is reduced by 70.85%when this method is adopted.This fully demonstrates that the partitioning results of the proposed method are stable,and the collaborative optimization method can improve the system voltage stability and reduce the system power loss. 展开更多
关键词 Gaussian mixture model Monte Carlo trend distribution network partition distributed voltage control synchronous ADMM
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Battery SOH enhanced solution:Voltage reconstruction and image recognition response to loss of data scenarios 认领 引用
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作者 Xinghua Liu Linxiang Zhou +4 位作者 Jiaqiang Tian Longxing Wu Zhongbao Wei Hany M.Hasanien Peng Wang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第1期155-169,I0005,共15页
Accurate estimation of battery health status plays a crucial role in battery management systems.However,the lack of operational data still affects the accuracy of battery state of health(SOH)estimation.For this reason... Accurate estimation of battery health status plays a crucial role in battery management systems.However,the lack of operational data still affects the accuracy of battery state of health(SOH)estimation.For this reason,a SOH estimation method is proposed based on charging data reconstruction combined with image processing.The charging voltage data is used to train the least squares generative adversarial network(LSGAN),which is validated under different levels of missing data.From a visual perspective,the Gram angle field method is applied to convert one-dimensional time series data into image data.This method fully preserves the time series characteristics and nonlinear evolution patterns,which avoids the difficulties and limited expressive power associated with manual feature extraction.At the same time,the Swin Transformer model is introduced to extract global structures and local details from images,enabling better capture of sequence change trends.Combined with the long short-term memory network(LSTM),this enables accurate estimation of battery SOH.Two different types of batteries are used to validate the test.The experimental results show that the proposed method has good estimation accuracy under different training proportions. 展开更多
关键词 State of health Voltage data reconstruction Least squares generative adversarial network Gramicci angle field Swin Transformer-LSTM network
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Asymmetric Voltage Vector-based Initial Rotor Position Detection in Four-switch Inverter Fed BLDC Motors 认领 引用
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作者 Xinmin Li Kun Liu +2 位作者 Lu Zhou Tingna Shi Wei Chen 《CES Transactions on Electrical Machines and Systems》 EI CSCD 2026年第1期77-86,共10页
In position-sensorless brushless direct current(DC)motors(BLDCMs)fed by a four-switch three-phase(FSTP)inverter,only two phases are fully controlled,while the remaining phase is tied to the midpoint of the split DC-li... In position-sensorless brushless direct current(DC)motors(BLDCMs)fed by a four-switch three-phase(FSTP)inverter,only two phases are fully controlled,while the remaining phase is tied to the midpoint of the split DC-link capacitors.The voltage pulses required by inductance-based initial position detection can cause unequal discharge of the series capacitors,shifting the neutral-point voltage away from half of DC-link voltage(Udc/2).This neutral-point drift breaks the spatial symmetry of the inverter voltage vectors,so the 360°electrical period can no longer be evenly partitioned into six sectors during initial rotor position detection.To address this issue,this paper proposes a detection-pulse injection sequence that explicitly accounts for the asymmetric voltage vectors of the FSTP inverter.With the proposed sequence,the initial rotor position can be identified within a 30°electrical sector.The method requires no additional voltage or current sensors,and experimental results confirm its feasibility. 展开更多
关键词 Brushless direct current(DC)motor(BLDCM) Four-switch three-phase(FSTP)inverter Asymmetric voltage vector Initial position detection
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Distribution Network Partitioning for Voltage Regulation Using Heterogeneous Graph Neural Networks Considering Cyber-Attacks Risk 认领 引用
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作者 Lei Xu Bo Zhang +1 位作者 Chunxia Dou Dong Yue 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第4期995-997,共3页
Dear Editor,The integration of distributed energy resources(DERs)and communication infrastructures makes distribution networks increasingly cyber-physical,requiring resilient and real-time voltage regulation.Network p... Dear Editor,The integration of distributed energy resources(DERs)and communication infrastructures makes distribution networks increasingly cyber-physical,requiring resilient and real-time voltage regulation.Network partitioning enables scalable control,yet existing methods often ignore communication and security constraints or rely on costly optimization,limiting practicality under dynamic and adversarial conditions. 展开更多
关键词 scalable controlyet distribution network partitioning heterogeneous graph neural networks distributed energy resources communication infrastructures cyber attacks risk distributed energy resources ders voltage regulation
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Distributed Load-Sharing and Loss Optimization Within Voltage Safety Constraints for Meshed DC Microgrid 认领 引用
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作者 Yu Zhang Yan-Wu Wang Xiao-Kang Liu 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第6期1518-1520,共3页
Dear Editor,This letter presents anε-exact penalty-based scalarization method to solve the constrained multi-objective optimization problem of load sharing and transmission loss minimization within voltage safety con... Dear Editor,This letter presents anε-exact penalty-based scalarization method to solve the constrained multi-objective optimization problem of load sharing and transmission loss minimization within voltage safety constraints in a meshed direct current(DC)microgrid.A distributed predefined-time optimization algorithm is designed and implemented by deploying consensus-based observers to obtain an optimal solution.The proposed algorithm is verified by simulations and hardware-in-the-loop experiments in cases of load variation,plugand-play,grid change,and by comparative study. 展开更多
关键词 consensus based observers predefined time optimization transmission loss minimization load sharing distributed load sharing voltage safety constraints exact penalty based scalarization meshed DC microgrid
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High-voltage anode-free sodium-sulfur batteries via high-valence S/SCl4 redox chemistry 认领 引用
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作者 Suli Chen Tianxi Liu 《Science China Chemistry》 SCIE EI CAS CSCD 2026年第7期3203-3204,共2页
The ever-growing demand on clean and sustainable energy has driven the development of rechargeable battery systems with high abundance and excellent energy storage performance.Roomtemperature sodium-sulfur(Na-S)batter... The ever-growing demand on clean and sustainable energy has driven the development of rechargeable battery systems with high abundance and excellent energy storage performance.Roomtemperature sodium-sulfur(Na-S)batteries have long been regarded as a promising,sustainable alternative to conventional lithium-ion batteries,owing to the high natural abundance of both sodium and sulfur. 展开更多
关键词 sustainable energy clean sustainable energy anode free rechargeable battery systems clean energy high voltage sodium sulfur batteries high valence S SCl redox chemistry
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Excellent ultrahigh voltage performance of a layered cathode supported by a sacrificial layer arising from deep selenium modification 认领 引用
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作者 Yan Zhu Jian Fu +7 位作者 Jingwei Hu Xinxiong Zeng Zhengjie Huang Bing Zhang Xiaocheng Li Wei Nie Ning Wang Xihao Chen 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第1期852-860,I0019,共9页
The implementation of multifunctional application scenarios for mobile terminal devices has increased the energy density requirements of batteries.Increasing the charging voltage can rapidly increase the specific capa... The implementation of multifunctional application scenarios for mobile terminal devices has increased the energy density requirements of batteries.Increasing the charging voltage can rapidly increase the specific capacity of layered transition metal oxides;however,it also exacerbates the release of lattice oxygen and the contraction of the unit cell.Ternary materials are designed in a secondary particle state to meet the requirements of power battery applications.Therefore,to create ternary materials that can operate under ultrahigh voltages,attention should be given to both surface modification and particle integrity maintenance.By utilizing elemental selenium(Se)with a low melting point,easy sublimation,and multiple variable valence states,deep grain boundary modification was implemented inside the particles.The performance of the cathode material was evaluated through pouch cells,and the improvement mechanism was explored through molecular dynamics simulation calculations.Under the protection of a three-dimensional Se-rich modified layer,LiNi1/3Co1/3Mn1/3O2achieved stable operation at ultrahigh voltages(4.6 V vs.Li/Li+);a sacrificial protection mechanism based on the chronic decomposition of the Se-rich layer was proposed to explain the efficacy of Se modification in stabilizing ternary materials.This deep grain boundary modification based on elemental Se provides a new solution for the ultrahigh-voltage operation of transition metal oxides and provides a scientific basis and technical support for solving the interface contact problem of all-solid-state batteries. 展开更多
关键词 Ternary cathode materials Ultrahigh voltage Selenium Deep modification
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Characterization of the susceptibility of ore particles to breakdown in high voltage pulse breakage and the influencing factors 认领 引用
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作者 Rui Sun Yang Hong +5 位作者 Daqian Wang Liang Si Jianguo Yang Wei Huang Liefeng Huang Weiran Zuo 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第1期113-124,共12页
The susceptibility of ore particles to electrical breakdown plays a critical role for high voltage pulse(HVP)breakage,yet its quantitative characterization still lacks deep understanding.Two indicators,namely breakdow... The susceptibility of ore particles to electrical breakdown plays a critical role for high voltage pulse(HVP)breakage,yet its quantitative characterization still lacks deep understanding.Two indicators,namely breakdown delay time(Td)and breakdown strength(Eb)were compared,based on analysis on the two breakdown modes namely wavefront mode and post-wave mode.It was found that Td is more suitable to characterize the susceptibility of ore particles to electrical breakdown in HVP breakage than Eb.A probabilistic model based on the Weibull distribution is developed to describe the relation of breakdown probability to Td.Regression analyses were conducted to investigate how operating parameters and particle properties influence Td and size reduction degree of ore particles in HVP breakage.The regressed models demonstrate potential capability to predict metallic minerals content and HVP breakage degree based on operating parameters and particle properties. 展开更多
关键词 Electrical breakdown High voltage pulse breakage Susceptibility Breakdown delay time
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An Improved Inverted SVPWM for Common-Mode Voltage Suppression and High-Order Harmonics Dispersion in PMSMs 认领 引用
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作者 Meng Zhang Lijuan Zhang +4 位作者 Jie Zhang Shiliang Miao Jiangong Yang Yajun Zhao Feifei Bu 《Energy Engineering》 EI 2026年第7期508-524,共17页
Conventional electric servo drive systems suffer from high common-mode voltage(CMV)due to the use of zero vectors in Space Vector Pulse Width Modulation(SVPWM).To mitigate this issue,this paper proposes an inverted SV... Conventional electric servo drive systems suffer from high common-mode voltage(CMV)due to the use of zero vectors in Space Vector Pulse Width Modulation(SVPWM).To mitigate this issue,this paper proposes an inverted SVPWM(I-SVPWM)strategy.By simply inverting the switching actions of a specific phase,this strategy avoids the use of zero vectors and achieves an effect similar to Active Zero-State PWM(AZSPWM),thereby effectively suppressing common-mode voltage.Compared with AZSPWM,the proposed method eliminates the need to recalculate vector action times or design new switching sequences.It can be seamlessly implemented by applying a straightforward inversion logic to the switching signals of one phase based on conventional SVPWM,which significantly enhances its practical convenience.Furthermore,similar to AZSPWM,the elimination of zero vectors in ISVPWM leads to an increase in harmonic peaks in the output voltage and current compared to conventional SVPWM.To address this,an Alternating Inverted SVPWM(AI-SVPWM)strategy is introduced.Since the sequence of vector actions differs in each cycle,the high and low levels of the line voltage shift locally within each switching period.This causes the reconstruction of harmonic and even fundamental components in the output waveform,thereby reducing harmonic peaks at even multiples of the switching frequency.Simulations of SVPWM,AZSPWM1,AZSPWM3,ISVPWM,and AI-SVPWM are conducted in MATLAB/Simulink.The results confirm that the proposed strategies effectively reduce common-mode voltage.Although AI-SVPWM achieves a lower harmonic amplitude compared to I-SVPWM,conventional SVPWM still maintains superior steady-state performance. 展开更多
关键词 PMSM SVPWM common-mode voltage harmonic dispersion switching sequences
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Modulating Electronic Structure with Linearly Fused Pyrazine Units for High-Voltage and Stable Zinc-Organic Batteries Cathode 认领 引用
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作者 Min-Jian Zhao Li-Bin Zhang +3 位作者 Jin-Tao Wang Kun Ding Hai-Mei Liu Yong-Gang Wang 《电化学（中英文）》 CAS 北大核心 2026年第5期1-13,共13页
High-voltage n-type organic cathode materials are critical for constructing zinc-organic batteries(ZOBs)with high en-ergy density and long cycle life.However,the intrinsically unfavorable electronic structures and rel... High-voltage n-type organic cathode materials are critical for constructing zinc-organic batteries(ZOBs)with high en-ergy density and long cycle life.However,the intrinsically unfavorable electronic structures and relatively high LUMO energy levels of most n-type materials often lead to sluggish kinetics,high solubility,and suboptimal discharge voltages(<0.8 V).Here,we design a small molecule,quinoxalino[2’,3’:5,6]pyrazino[2,3-f][1,10]phenanthroline(DPQP),as a ZOB cathode by introducing locally electron-deficient motifs into the conjugated backbone of aromatic compounds.The linear-ly fused pyrazine units extending the pyrazine-benzene framework effectively optimize the electronic structure,thereby significantly enhancing the discharge voltage.Meanwhile,the expandedπ-conjugated plane suppresses dissolution and accelerates charge-transfer kinetics.Benefiting from these features,the DPQP electrode exhibits an exceptional increase in average operating voltage from 0.61 V to 1.07 V(vs.Zn²+/Zn)at 0.1 A·g-1,with an overpotential of only 140 mV.Notably,no discernible voltage decay occurs as the current density increases,indicating rapid and highly reversible redox kinetics.Furthermore,the DPQP cathode delivers outstanding cycling stability,maintaining over 2000 h of continuous operation at 0.1 A·g-1and retaining 82.5%of its capacity after more than 10,000 cycles at 10 A·g-1.Remarkably,the DPQP electrode also demonstrates excellent tolerance to extreme temperatures,achieving stable electrochemical performance across a wide temperature range from-20°C to 60°C.In addition,a series of spectroscopic and microscopic characterizations confirm the highly reversible redox behavior and Zn²+storage mechanism of the DPQP cathode. 展开更多
关键词 Aqueous zinc batteries Organic cathode n-type material Electronic structure design High voltage
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Parameter Optimization Strategy for VSC-HVDC Low-Voltage Ride-Through Considering Short-CIRCUIT Current and System Stability 认领 引用
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作者 Zimin Zhu Yu Duan +3 位作者 Jian Ma Xiaoyun Wang Xiaoyu Deng Xiaofang Wu 《Energy Engineering》 EI 2026年第4期321-340,共20页
When the converter bus voltage of a voltage source converter-based high voltage direct current(VSC-HVDC)system drops below a certain predetermined threshold,the system enters low-voltage ride-through(LVRT)mode to avoi... When the converter bus voltage of a voltage source converter-based high voltage direct current(VSC-HVDC)system drops below a certain predetermined threshold,the system enters low-voltage ride-through(LVRT)mode to avoid overcurrent and potential equipment failure,during which it operates as a controlled current source.The influence mechanism of LVRT control strategies on short-circuit current and overall system stability remains not yet fully and systematically investigated.First,this paper provides an overview of several LVRT strategies for VSC-HVDC systems and examines their effects on short-circuit current contribution.Next,it analyzes in detail the mechanisms through which active and reactive currents injected during LVRT impact system frequency stability,voltage stability,and synchronization stability.To address these interrelated issues,an optimized and comprehensive LVRT strategy incorporating short-circuit current constraints is proposed.The approach determines the active current ratio based on system frequency stability requirements and dynamically adjusts the active current recovery rate via phase control of the VSC-HVDC bus.The remaining capacity is allocated to reactive current support,thereby enhancing voltage and synchronization stability while maintaining sufficient short-circuit current margin and system frequency stability.Finally,simulations conducted on the PSS/E platform,using actual grid data from a selected cross-section system,validate convincingly the effectiveness of the proposed parameter optimization strategy for VSC-HVDC low-voltage ride-through. 展开更多
关键词 Short-circuit current VSC-HVDC systems LVRT voltage stability frequency stability synchronization stability
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3D-printed Ti/graphene composite current collectors for high-voltage aqueous zinc-ion batteries 认领 引用
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作者 Yang Zhiqiang Yang Hao +8 位作者 Wang Rui Wan Yi Zhang Yan Liu Chenhao Zhang Zian Li Yuqi Wu Mingbo Hu Han Chen De 《新型炭材料（中英文）》 SCIE EI CSCD 北大核心 2026年第3期641-651,I0048-I0062,共11页
Aqueous zinc-ion batteries(AZIBs)have significant promise as large-scale energy storage devices due to their high safety,low cost,and environmental friendliness.However,their application has been constrained by limite... Aqueous zinc-ion batteries(AZIBs)have significant promise as large-scale energy storage devices due to their high safety,low cost,and environmental friendliness.However,their application has been constrained by limited operational voltage windows.A high-voltage-resistant Ti-graphene-Ti cathode current collector(TGT)was designed and fabricated by three-dimensional(3D)printing.The surface of the TGT has a TixOy protective layer,which effectively suppresses electrolyte decomposition under high voltage conditions so that the voltage window of the battery is extended to 1.0-2.2 V without the obvious formation of by-products.Simultaneously,the graphene layer in the TGT structure significantly improves the adsorption and insertion/extraction kinetics of cations,resulting in a high specific capacity of 307.5 mAh g−1and a prolonged cycling life of the battery.The resultant AZIBs have a stable charge/discharge performance over 400 cycles at a high voltage.Furthermore,the influence of the geometric arrangements of Ti and graphene in the 3D printing process on the energy storage mechanism was investigated and provided novel insight for the development of high-voltage-resistant composite cathode current collectors for AZIBs. 展开更多
关键词 3D printing Aqueous zinc-ion batteries Composite current collectors High-voltage cathodes Wide voltage window
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Fault Identification in Renewable Energy Transmission Lines Using Wavelet Packet Decomposition and Voltage Waveform Analysis 认领 引用
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作者 Huajie Zhang Xiaopeng Li +2 位作者 Hanlin Xiao Lifeng Xing Wenyue Zhou 《Energy Engineering》 EI 2026年第3期434-458,共25页
The integration of a high proportion of renewable energy introduces significant challenges for the adaptability of traditional fault nature identification methods.To address these challenges,this paper presents a nove... The integration of a high proportion of renewable energy introduces significant challenges for the adaptability of traditional fault nature identification methods.To address these challenges,this paper presents a novel fault nature identification method for renewable energy grid-connected interconnection lines,leveraging wavelet packet decomposition and voltage waveform time-frequency morphology comparison algorithms.First,the paper investigates the harmonic injection mechanism during non-full-phase operation following fault isolation in photovoltaic renewable energy systems,and examines the voltage characteristics of faulted phases in renewable energy scenarios.The analysis reveals that substantial differences exist in both the time and frequency domains of phase voltages before and after the extinction of transient faults,whereas permanent faults do not exhibit such variations.Building on this observation,the paper proposes a voltage time-frequency feature extraction method based on wavelet packet decomposition,wherein low-frequency waveform components are selected to characterize fault features.Subsequently,a fault nature identification method is introduced,based on a voltage waveform time-frequency morphology comparison.By employing a windowing technique to quantify waveform differences before and after arc extinction,this method effectively distinguishes between permanent and transient faults and accurately determines the arc extinction time.Finally,a 220 kV renewable energy grid connection line model is developed using PSCAD for verification.The results demonstrate that the proposed method is highly adaptable across various fault locations,transition resistances,and renewable energy control strategies,and can reliably identify fault nature in renewable energy grid connection scenarios. 展开更多
关键词 New energy fault nature identification arc extinguishing time shunt reactors variation mode decomposition port voltage
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