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An Improved Approach Based on Transformer Network for Remaining Useful Life of Lithium-ion Battery

An Improved Approach Based on Transformer Network for Remain...

引用

Power and Electrical engineering (ACPEE), 5th Asia Conference on

作者： Jilong Mao Xin Yin Rui Chen Kai Ding Lin Jiang Jinmu Lai Xianggen Yin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China The Department of Electrical Engineering and Electronics University of Liverpool Liverpool U.K. CYG SUNRI CO. LTD. Shenzhen China School of Electrical and Information Engineering Zhengzhou University Zhengzhou China

In the midst of a growing energy crisis, lithium batteries are attracting attention from various countries. With the massive use of lithium batteries in energy storage systems, accurately predicting the health status of lithium batteries has become a key issue. In battery management systems, predicting battery life is an important part, but it is difficult for current RNN-based neural networks to learn dependencies between distant positions, resulting in reduced accuracy. In this paper, we presented the EMD-Transformer method to achieve accurate prediction of battery life using only a small amount of online battery data. In the data pre-processing process, offline data were added to the dataset. Then EMD was used to extract lifetime degradation trends as well as capacity regeneration information. The Transformer model was used to get prediction results. Finally, a comprehensive SOH prediction result was generated by integrating all the separate results. Using a few battery lifetime data, we demonstrated that the RMSE of the prediction results is within 3%, which owes a higher accuracy than the existing Transformer and LSTM methods.

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Principle and Implementation of Networked Protection in Active Distribution Networks

Principle and Implementation of Networked Protection in Acti...

引用

IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Jiexiang Han Zhe Zhang Qisheng Ran Xianggen Yin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665434263

The performance of conventional protections has deteriorated in active distribution networks (ADN) because of high penetration of distributed generator (DG) and solid state transformer (SST). In this paper, based on the features of short-circuit current fed by DG and SST, the current distribution characteristics of ADN are analyzed. Moreover, a networked protection scheme is proposed for ADN. This scheme compares the amplitudes of negative-sequence, zero-sequence and phase currents between different ports of grid component to realize fault identification. It can act rapidly and has the ability to cope with large transition resistance. Communication system only needs to transmit current amplitude, and synchronous sampling is not required. In addition, there is no requirement for voltage measurement, which will help to reduce cost. The effectiveness of the protection scheme is verified via simulation tests.

关键词： Fault diagnosis Resistance Voltage measurement Voltage transformers Simulation Short-circuit currents System integration

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Protection CT Polarity Checking Method for MMC-HVDC Converter Station Transformer

Protection CT Polarity Checking Method for MMC-HVDC Converte...

引用

Power and Electrical engineering (ACPEE), 5th Asia Conference on

作者： Binyan Liu Xianggen Yin Yuanlin Pan Maolin Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Aiming at the difficulty of CT polarity checking of MMC-HVDC converter station transformer, a method for CT polarity checking based on waveform comparison and instantaneous power theory is proposed. The transient current during the process of the converter transformer and the converter valve charging is analyzed, and the polarity of the zero-sequence differential protection and the longitudinal differential protection is checked by comparing the crossing transient current on both sides of the protection based on the longest common subsequence (LCSS) distance. At the same time, the instantaneous active power during the converter valve deblock is used to check the polarity of directional protection. This method can not only check the polarity of longitudinal differential protection and zero-sequence differential protection, but also can check the polarity of directional protection, and the reversed phase of CT can be found out. Moreover, it can withstand a certain degree of ratio error and phase error of CT. The simulation verifies the effectiveness and applicability of the method.

关键词： Electrical engineering Sensitivity Asia Valves Transient analysis

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Dual-Loop PQ Control Scheme for Transient Stability Enhancement and Current Limitation of VSG

Dual-Loop PQ Control Scheme for Transient Stability Enhancem...

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International Conference on Power System technology (POWERCON)

作者： Kun Sun Wei Yao Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665407380

The transient angle instability and overcurrent of the virtual synchronous generator (VSG) under severe fault are risks for the stable and safe operation. Existing works have proposed some efficient methods for the transient stability enhancement or current limitation of VSG. Yet, the consideration for both of them is rarely studied. Moreover, the reasonable parameter design method for the control is usually lacked. In this paper, with the large signal model of VSG, a dual-loop PQ control scheme is introduced. With the proposed method, both the transient angle stability and overcurrent can be controlled simultaneously. In addition, how to design the reasonable coefficients of the proposed control scheme with additional requirement of output active power is also presented. The effect of the proposed method can be achieved with the coefficients in the allowable range. Finally, this method is validated by simulation results.

关键词： Simulation Design methodology Power system stability Stability analysis Synchronous generators Transient analysis

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Transmission expansion planning considering customer interests for wind power integration in electricity power market

Transmission expansion planning considering customer interes...

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Smart Grids and Energy Systems (SGES), International Conference on

作者： Zhongfei Chen Hui Song Yang Bai Qiuna Cai Yue Zhao Zhicong Nie Tianyu Jin Power Dispatch and Control Center Guangdong Power Grid Co. Ltd China Southern Power Grid Co. Ltd Guangzhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The high penetration of variable renewable energy sources (RES) in the power system poses substantial risks to the operation of the electricity power market. How to ensure the stability and economy of power market operation while consuming RES is a great challenge for transmission expansion planning (TEP). In this paper, we propose a price signal-based planning model that takes into account the interests of the customer side, which can promote the consumption of RES, effectively cope with the price fluctuations caused by the volatility of RES, suppress the price spikes and reduce the price risks of the customer side.

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Inertia Provision of DFIG-Based Wind Turbines by Improving the Damping Ratio of PLL

Inertia Provision of DFIG-Based Wind Turbines by Improving t...

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Energy Technologies for Future Grids (ETFG), IEEE International Conference on

作者： Yini Zhou Wei He Donghai Zhu Xudong Zou Zhikun Wang Weilin Hou School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Shandong Electric Power Company Dongying Power Supply Company Dongying China China Electric Power Research Institute Beijing China

Due to the rapid control of power electronics, it results that the wind turbines (WTs) typified by double-fed induction generator (DFIG) based WTs do not have inertia response capability. Many inertia control methods have been proposed, but they suffer from large structural modifications, high cost, poor adaptability, and slow response. In this regard, this paper first analyzes the inertia response characteristics of DFIG-based WT and further reveals principle of achieving power response of WTs from controlling the phase-locked angle. Then, why the WTs have no inertia response capacity is analyzed when a typical phase-locked loop (PLL) is adopted. Based on this, an inertia response strategy of DFIG-Based WTs by improving the damping ratio of PLL is put forward, and frequency domain response characteristic of it is compared and analyzed with those of typical PLL. Finally, a simulation system of synchronous generator (SG) and an aggregated WT farm is built in MATLAB/Simulink for verification.

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Discharge characteristics of DC self-pulse touchable plasma jets 1

Discharge characteristics of DC self-pulse touchable plasma ...

引用

1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Xu, Jiaxing Nie, Lanlan Lu, Xinpei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

The atmospheric pressure non-equilibrium plasma jet (APNP-Js) show great advantages in biomedicine application. This article introduces a touchable DC self-pulse jet with air or helium as the working gas. In order to have quantitative research on the discharge, the discharge current characteristic has been studied that includes the current amplitude, the half-width of the current, and the frequency of the current. Besides that, the nitrogen and oxygen have been added in helium cases to see the influence. For the touchable cases, the discharge mode for air is transient glow while for helium is filamentary. And with the discharge gap increases, the frequency decreases for two cases. The current amplitude changes slightly and half pulse width increases for air, while for helium the amplitude increases and half pulse width changes slightly. © 2020 IEEE.

关键词： Atmospheric pressure

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Simulation analysis of fabry perot effect in terahertz time domain spectroscopy 1

Simulation analysis of fabry perot effect in terahertz time ...

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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Yang, Jiayi Tu, Xiude Wang, Lei Xiong, Yongqian Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

This paper uses the parameter extraction model of the transmission terahertz time-domain spectroscopy technology to theoretically simulate the terahertz time-domain signal of the sample, and then simulates and analyzes the Fabry-Perot effect. The simulated sample signal is very close to the measured sample signal. Through simulation, the influence of thickness, refractive index and extinction coefficient on the terahertz time-domain signal is analyzed. Finally, suggestions for sample detection and signal processing of terahertz time-domain spectroscopy are put forward. © 2020 IEEE.

关键词： Spectrum analysis

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Concept and Definition of Dynamic Symmetrical Components with Time-Varying Amplitude and Frequency

Concept and Definition of Dynamic Symmetrical Components wit...

引用

IEEE General Meeting Power& Energy Society

作者： Yingbiao Li Jiabing Hu Weizhong Wen Qinghua Wang Shicong Ma Jianbo Guo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China China Electric Power Research Institute Beijing China

This paper investigates the dynamic symmetrical component method of internal voltage vector with time-varying amplitude and frequency. With the large-scale integration of power electronic devices into the power grid, when there is an asymmetrical fault in the AC network, the voltages and currents present the characteristics of amplitude and frequency time-varying modulation. Hence, the traditional asymmetrical fault analysis method and concept based on phasor models with constant amplitude and frequency are not adaptive enough. In order to supplement the traditional symmetrical component method and concept, the phasor models and vector models with time-varying amplitude and frequency are established. Then, the asymmetrical three-phase phasors with time-varying amplitude and frequency are decomposed into three groups of symmetrical phasors with time-varying amplitude and frequency. Based on the mathematical and physical characteristics of symmetrical components, the applicable concept and definition are reestablished. Lastly, time-domain simulations corroborate the theoretical analysis.

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Uninterrupted Ice Melting technology Based on Zero-sequence Reactance Integrated Device

Uninterrupted Ice Melting Technology Based on Zero-sequence ...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Fan Zhou Guangyi Zhang Chun Song Dayi Li Xiong Xie Weiyu Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

In this article, the integrated device of zero sequence reactance consists of the grounding reactor and adjustable reactor. A set of on-line ice melting device is designed and a grounding transformer model is constructed in ANSYS software to verify the feasibility of the ice melting device. The results show that the device can make use of Joule heat generated by zero sequence current to deice the conductor.

关键词： Three-dimensional displays Grounding Simulation Transformer cores Transformers Ice Software

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