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A Fault Diagnosis Method for Electric Vehicle Lithium power Batteries Based on Dual-Feature Extraction from the Time and Frequency Domains

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Journal of Electrochemical Energy Conversion and Storage 2025年第3期22卷 031008页

作者： Chang, Chun Dai, Jiuhe Pan, Yaliang Lv, Lu Gao, Yang Jiang, Jiuchun Hubei Key Lab. for High Efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China Sunwoda Electronic Co. Ltd Shenzhen518108 China School of Electric Power South China University of Technology Guangzhou510640 China

This study focuses on the safety and reliability issues of lithium-ion batteries, proposing a fault diagnosis strategy that leverages dual-feature extraction from both the time and frequency domains. Additionally, by modifying the traditional autoencoder, the study proposes a feature-guided autoencoder as an unsupervised model for extracting features in the time domain. Initially, wavelet packet decomposition and its energy-denoising treatment are employed to refine fault information within battery voltage signals. Subsequently, the reconstruction error outputted by the Feature-Guided Autoencoder is utilized as the time-domain fault feature, while the cosine similarity of the energy of signals in various frequency bands obtained after wavelet packet decomposition serves as the frequency-domain fault feature. Ultimately, this article selects the Isolation Forest algorithm for two-dimensional outlier detection of time and frequency features. Experimental results demonstrate that the feature-guided autoencoder proposed in this study not only enhances the sensitivity of time-domain fault features compared to traditional autoencoders and their variants but also optimizes issues related to training time and computational load. The effectiveness of the proposed dual-feature fault diagnosis method in both the time and frequency domains is validated through data from two actual vehicles, showing superior early fault detection capability relative to single-feature fault diagnosis methods. Copyright © 2024 by ASME.

关键词： Wavelet decomposition

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Performance-Aware control of Modular Batteries For Fast Frequency Response

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IEEE Transactions on Sustainable Energy 2025年

作者： He, Yutong Ruan, Guangchun Zhong, Haiwang Tsinghua University State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Beijing100084 China Massachusetts Institute of Technology Lab for Information and Decision Systems CambridgeMA02139 United States

Modular batteries can be aggregated to deliver frequency regulation services for power grids. Although utilizing the idle capacity of battery modules is financially attractive, it remains challenging to consider the heterogeneous module-level characteristics such as dynamic operational efficiencies and battery degradation. In addition, real-time decision making within seconds is required to enable fast frequency response. In order to address these issues, this paper proposes a performance-aware scheduling approach for battery modules to deliver fast frequency response (FFR) support. In particular, the conduction loss and switching loss of battery packs as well as converters are captured within a mix-integer quadratic constrained program (MIQCP). The cycle-based aging model identifies the aging cost of battery modules during frequent cycling by introducing the aging subgradient calculation and linearization. Case studies based on real-world battery data show that the proposed scheduling approach can effectively reduce power loss cost by nearly 28%-57% and battery aging cost by 4%-15% compared to conventional methods, which can also enhance the SoC balance. © 2010-2012 IEEE.

关键词： Battery management systems

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Directional Beamforming for High-Speed Railway Communications with Frequency Offset Precorrection

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Chinese Journal of Electronics 2025年第1期23卷 163-168页

作者： Yuan Cao Yinghong Wen Wei Xu Xin Xie School of Electronics and Information Engineering Beijing Jiaotong University National Engineering Research Center of Rail Transportation Operation and Control System Beijing China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China National Mobile Communications Research Lab. Southeast University Nanjing China

This paper considers a multi-antenna transmission strategy for high speed railway communications. In order to achieve better performance than conventional space-frequency block coding schemes, we propose a directional beamforming strategy for the High-speed railway (HSR) communication by exploiting some characteristic of the railway system including predetermined moving tracks and real-time positioning information. Moreover, for alleviating the effect of Doppler shift due to the moving train, a frequency offset precorrection method is also incorporated with direction beamforming. Theoretical Signal-to-noise ratio (SNR) gain of the proposed beamforming scheme over traditional HSR communication schemes is also derived for illustrating the performance enhancement. Numerical results verify the effectiveness of our proposed scheme even with some kind of imperfect position information availab.e at the transmitter.

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Performance-Aware control of Modular Batteries For Fast Frequency Response

arXiv

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arXiv 2025年

作者： He, Yutong Ruan, Guangchun Zhong, Haiwang State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing100084 China Lab for Information and Decision Systems Massachusetts Institute of Technology CambridgeMA02139 United States

关键词： Battery management systems

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Combination Result of Two MPPT Techniques (Fuzzy Logic and Perturb and Observe Method): Comparison with The Conventional Perturb and Observe Method 5

Combination Result of Two MPPT Techniques (Fuzzy Logic and P...

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5th IEEE Conference on Energy Internet and Energy system Integration, EI2 2021

作者： Djikeussi, Ghislain Li, Xuejin Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434256

Extracting maximum power from a photovoltaic generator, regardless of meteorological conditions, remains a challenge in the field of solar photovoltaics. Therefore, techniques have been developed to find the best operating point of a photovoltaic module. These include the conventional perturbation and observation method and the fuzzy logic technique. In this paper, we present the combination of two MPPT methods, namely the perturbation and observation method and the fuzzy logic method. We aim to show whether the combination of two different MPPT techniques for a solar system is more accurate and efficient in determining the peak power point than the conventional perturbation and observation method alone. © 2021 IEEE

关键词： Solar power generation

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A control Strategy of CLLLC DC Transformers under Unbalanced AC Voltage Conditions in Hybrid Microgrids 5

A Control Strategy of CLLLC DC Transformers under Unbalanced...

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5th IEEE Conference on Energy Internet and Energy system Integration, EI2 2021

作者： Kong, Jiansheng Ren, Chunguang Wei, Xinwei Qin, Yue Guo, Dongxin Zhang, Baifu Wang, Yifan Li, Xuejin Hao, Guanfei Shanxi Key Lab. of Power System Operation and Control Taiyuan Unversity of Technology Taiyuan China

ISBN: (纸本)9781665434256

Under unbalanced AC microgrid voltage conditions in hybrid microgrids, DC microgrid bus will generate double frequency ripple voltage pulsation, which damages the voltage stability. In order to suppress the double-frequency pulsation, a control strategy suitable for CLLLC DC transformers is proposed in this paper. First, an equivalent model is established by first harmonic approximation to describe the fundamental wave of CLLLC DC transformers. On the basis, its voltage gain characteristics and input impedance characteristics can be analyzed. Then, considering the feature of the input voltage pulsation of the DC transformer under unbalanced voltage conditions, the parameters of the DC transformer are optimized according to the design index. Therefore, a control strategy based on the double frequency ripple voltage pulsation feed-forward is proposed and the PR controller is adopted to effectively suppress the DC bus voltage fluctuation when the input voltage is pulsing. Finally, the proposed voltage feedforward control strategy and parameter optimization de-sign are verified by the Matlab.Simulink results. © 2021 IEEE

关键词： DC transformers

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Reliability Assessment of Wind Farm with Wind Turbine Gearbox Fatigue 5

Reliability Assessment of Wind Farm with Wind Turbine Gearbo...

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5th IEEE Conference on Energy Internet and Energy system Integration, EI2 2021

作者： Wang, Jiali Han, Xiaoqing Song, Tianhao Jia, Yanbing Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434256

The gearbox of wind turbine has the longest downtime due to mechanical failure, and fatigue is the most important failure form of gearbox. Traditional wind reliability model not considering the influence of gear box of immobilized fatigue, this paper proposes a meter and gearbox fatigue reliability evaluation method of wind farms, this method is intuitive reflect the extent to which each gearbox fatigue damage caused by different failure rate difference, and applicable to other fatigue as the main failure forms of component reliability modeling. The fatigue failure rate model of wind turbine gearbox was established based on the fatigue analysis of wind turbine gearbox, and the fatigue failure state was embedded into the conventional wind turbine Markov model through the failure rate, which was applied to the reliability evaluation of containing wind farm to improve the evaluation accuracy. The results show that ignoring the gearbox fatigue failure will lead to the wind turbine outage risk assessment results are relatively conservative, overestimate the reliability level of wind farm, and the more serious the accumulation of gearbox fatigue damage, the more significant the impact on the system reliability. © 2021 IEEE

关键词： Weibull distribution

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A control Strategy for T-Type Three-Level Converter to Suppress Midpoint Voltage Fluctuation 5

A Control Strategy for T-Type Three-Level Converter to Suppr...

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5th IEEE Conference on Energy Internet and Energy system Integration, EI2 2021

作者： Hao, Guanfei Ren, Chunguang Zhang, Baifu Kong, Jiansheng Guo, Dongxin Han, Xiaoqing Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434256

T-type three-level converter is widely used in high-current and low- voltage fields owing to its small number of power devices, low on state loss and high power density. Midpoint potential balance control of T-type converter is one of its key technologies. The neutral point potential imbalance increases harmonic distortion rate of output voltage and current, and reduce service life of DC side capacitor. This paper proposes midpoint potential balance control strategy in view of PIR-controlled zero-sequence voltage to control offset and fluctuation of midpoint potential. Functional model between midpoint current, reactive current and active current and the functional link between SPWM and SVPWM are established. The control strategy is simple in calculation and fast in dynamic response. It can realize midpoint potential balance domination under different power factors and the suppression of low-frequency voltage pulsation. Ultimately, simulations verify the effectiveness and correctness of proposed domination tactics. © 2021 IEEE

关键词： power converters

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A Hybrid Dynamic Voltage Sharing Scheme for Series-connected SiC MOSFETs with Single Gate Drive 4

A Hybrid Dynamic Voltage Sharing Scheme for Series-connected...

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2022 4th International Conference on Energy, power and Grid, ICEPG 2022

作者： Ren, Yuhan Wang, Jinhao Meng, Runquan Li, Tingting Chen, Juan Zhang, Taotao Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan China

At present, the voltage level of a commercial SiC MOSFET can hardly meet the requirements of high-voltage field. For the sake of achieving the application of MOSFETs in high-voltage fields, the method of series-connected MOSFETs has become a practical and effective solution. However, multiple series-connected SiC MOSFETs face the problem of voltage unbalance, especially dynamic voltage unbalance. Generally, the problem of dynamic unbalance could be solved using load side voltage sharing schemes or the methods of gate side. This paper uses a hybrid dynamic voltage sharing scheme for the single-driven series-connected SiC MOSFETs. That is to say, based on a sequential lagging single gate drive topology, combining active clamping circuits with RCD snubber circuits are introduced to solve the problem of dynamic voltage unbalancing of the whole module in this paper. Compared to the circuit without any dynamic voltage sharing scheme, the dynamic voltage imbalance degree of the circuit with a hybrid dynamic voltage sharing scheme is decreased to 3.75% during the switching-on and switching-off periods. The equalization effect would be verified through the simulation under clamped inductive load in LTspice. © Published under licence by IOP Publishing Ltd.

关键词： Silicon carbide

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Coordinated control Strategy of Secondary Ripple in DC Microgrid Based on Impedance Model 5th

Coordinated Control Strategy of Secondary Ripple in DC Micro...

引用

5th International Conference on Energy Storage and Intelligent Vehicles, ICEIV 2022

作者： Li, Xuejin Ren, Chunguang Pang, Fangyuan Deng, Haonan Wang, Yifan Qin, Yue Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9789819910267

When DC microgrid is connected to a single-phase AC load, it will cause the DC bus to generate double-frequency voltage pulsation, which seriously affects the normal operation of important units. To solve the above problems, from the perspective of impedance modeling, this paper proposes a secondary ripple coordinated control strategy of DC microgrid based on impedance model. Firstly, the origin of the secondary ripple voltage of the DC microgrid is firstly analyzed, and the input and output impedance models of each unit of the DC microgrid are established. On this basis, the paper introduces band-pass and band stop filters to reshape the output impedance of each key converter at 100 Hz, so as to realize the effective suppression of secondary ripple current by energy storage converter. In order to further reduce the influence of secondary ripple power on each unit connected to the DC bus and ensure the voltage quality of DC bus. The active capacitor converter is introduced to actively control the secondary ripple power by adjusting the virtual capacitance of the active capacitor, so as to suppress the secondary ripple voltage of the DC bus. Finally, the effectiveness of the control strategy proposed in this paper is verified by simulation. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： power quality

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