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IEEE Asia Power and Energy engineering Conference (APEEC)

作者： Feng Li Yinya Zhang Jianghui Xi Mingyu Yan Central China Branch of State Gird Corporation of China Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350373479

ISBN: (纸本)9798350373486

The introduction of renewable energy will result in system load imbalance. Energy storage can accommodate the high penetration level of renewable energy. However, the existing discrete time-based operation method cannot accurately reflect the evolution of renewable energy. Accordingly, the energy storage does not get to make use of the well. This paper provides a continuous time-based operation method for energy storage under the large penetration level of renewable energy. Different with the conventional discrete time-based operation method, there is no need to divide the whole dispatch time duration into multiple discrete intervals. We illustrate the concept of continuous time-based operation method for energy storage and provide the corresponding mathematical model based on differential equations. Then, the Bernstein polynomial is adopted to linearize the primal problem into a linear problem. The proposed method is tested on the IEEE-RTS 79 system. Numerical results illustrate the effectiveness of the proposed method in making full use of energy storage. Compared with the conventional discrete time-based method, the proposed method can accurately consider the change of renewable energy.

关键词： Electrical engineering Renewable energy sources Asia Differential equations Programming Polynomials Mathematical models

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Review of current ZT>1 thermoelectric sulfides

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Journal of Materiomics 2024年第1期10卷 218-233页

作者： Fu-Hua Sun Hezhang Li Jun Tan Lingmei Zhao Xinyu Wang Haihua Hu Chao Wang Takao Mori School of Materials Science and Engineering Hubei Normal UniversityHuangshi435002China International Center for Materials Nanoarchitechtonics(WPI-MANA) National Institute for Materials Science(NIMS)Namiki 1-1Tsukuba305-0047Japan Department of Precision Instrument Tsinghua UniversityBeijing100084China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Graduate School of Pure and Applied Sciences University of TsukubaTsukuba305-8671Japan Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan528225China

Thermoelectrics has played a fascinating role in the developments of direct energy conversion *** the past decade,sulfur-based thermoelectric materials have been significantly advanced in optimizing electrical and thermal transport due to their similarities in chemical and structural properties with tellurides and *** review provides research progress on metal sulfides,particularly focuses on materials exhibiting high thermoelectric figure of merit(ZT>1.0).It highlights the potential compounds,***-S,Sn-S,Pb-S based,and *** strategies of superionic conducting,band configuration tuning,high-entropy alloying,and anomalous harmonic scattering are try to demonstrate the performance-improved mechanisms for thermoelectric *** addition,some common synthesis recipes are briefly introduced,and thereby making potential candidates as excellent alternatives for producing thermoelectric power generators in the mid *** outcomes along with how to further improve the thermoelectric performance and promote its scale-up applications are also outlined at the end.

关键词： Synthetic technology Figure merit of ZT Sulfides Thermoelectric

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Transformer Fault Diagnosis Based on Stacked Contractive Auto-Encoder Net 10th

Transformer Fault Diagnosis Based on Stacked Contractive Aut...

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10th International Conference on Computer engineering and Networks, CENet 2020

作者： Zhong, Yang Hu, Chuye Lu, Yiqi Wang, Shaorong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei Province430074 China

ISBN: (纸本)9789811584619

Dissolved gas analysis (DGA) is an effective method for oil-immersed transformer fault diagnosis. This paper proposes a transformer fault diagnosis method based on Stacked Contractive Auto-Encoder Network (SCAEN), which can detect the transformers internal fault by using DGA data, including H2, CH4, C2H2, C2H4, C2H6. The network consists of a three-layer stacked contractive auto-encoder (SCAE) and a backpropagation neural network (BPNN) with three hidden layers. A large amount of unlabeled data is used to train to obtain initialization parameters, and then a limited labeled dataset is used to fine-tune and classify the faults of trans-formers. The proposed method is suitable for transformer fault diagnosis scenarios, which contains very limited labeled data. when tested on real DGA dataset, the fault diagnosis accuracy is up to 95.31% by SCAEN, which performs better than other commonly used models such as support vector machine (SVM), BPNN, auto-encoder (AE), contractive auto-encoder (CAE) and SCAE. © 2021, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Support vector machines

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Interaction between PMSG and DFIG in a hybrid wind farm integrated through a VSC-HVDC 10

Interaction between PMSG and DFIG in a hybrid wind farm inte...

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10th Renewable Power Generation Conference, RPG 2021

作者： Sun, Kun Yao, Wei Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Province Wuhan430074 China

ISBN: (纸本)9781839536069

The electrical oscillations may occur in both the permanent magnet synchronous generator (PMSG)-based wind farm and double fed induction generator (DFIG)-based wind farm. However, the interaction between them in a DFIG-PMSG hybrid wind farm still need to be investigated, especially when integrated through a voltage source converter based HVDC (VSC-HVDC) system. In this paper, the influence of PMSG on the sub-synchronous oscillation (SSO) origins from DFIG with a VSC-HVDC is analysed based on the sequence impedance models. Similarly, the influence of DFIG on the medium-frequency oscillation (MFO) origins from PMSG with a VSC-HVDC is analysed as well. The analysis results show that both the two types of oscillations can be avoided according to the interaction between PMSG and DFIG with the appropriate parameters, which is meaningful for the actual project. Finally, the correctness of the analysis results is validated by time-domain simulation. © The Institution of engineering and technology.

关键词： Asynchronous generators

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Contact Pressure Calculation Based on Vacuum Contact Materials and Operating Conditions

Contact Pressure Calculation Based on Vacuum Contact Materia...

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

作者： Shengqin Xu Lixue Chen Zhao Yuan Yinghui He Xinyang Zou Likang Sun State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

Pressure of vacuum circuit breaker contacts should meet the requirements of contact resistance, and inhibit contact bounce when short-circuit current is flowing. However, the value of contact pressure is often obtained empirically. This paper analyzes the worst electrical contact conditions based on the contact resistance of the electrical contact surfaces, and propose a method to calculate the contact pressure based on contact material, radius and short-time current withstand, which is based on the melting of the conductive spots. Finally, hrough the comparison of several sets of working conditions, it is verified that the calculation method is effective.

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Characterization of Lorentz Force Distribution in electromagnetic Repulsion Mechanism of Multiple Parallel Circuit Breakers

Characterization of Lorentz Force Distribution in Electromag...

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

作者： Yinghui He Lixue Chen Zhao Yuan Shengqin Xu Likang Sun Xinyang Zou State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

In order to meet the requirements of parallel circuit breaker opening rapidity and synchronization, a new structure of electromagnetic repulsion mechanism (EMRM) is proposed in this paper. A three-dimensional transient flexible body model of the mechanism was built in COMSOL. Simulation results show that the EMRM can reach the rated opening distance of 20mm in 4.86ms, and the maximum stress during the motion is 246MPa. There is vibration in the motion process due to the uneven distribution of Lorentz force, and the vibration is periodic. The maximum stress is related to the vibration characteristics. Through theoretical derivation and simulation analysis, an analytical formula describing the relationship between the Lorentz force distribution and structural parameters is proposed in this paper. Error between the formula results and the simulation results is less than 4.5%. The analytical formula can be applied to parameter design.

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Modeling and Analysis of DFIG-WT-Dominated Power Systems in electromagnetic Timescale Considering Negative Sequence Control

Modeling and Analysis of DFIG-WT-Dominated Power Systems in ...

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Sustainable Power and Energy Conference (iSPEC)

作者： Zeren Guo Jianhang Zhu Jiabing Hu Guojie Zhao Zefei Wu Buyang Du State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China Department of Electrical and Electronic Engineering The University of Hong Kong Hong Kong China

ISBN: (数字)9798350395075

ISBN: (纸本)9798350395082

The requirement for negative sequence control introduces time-varying coupling between the positive and negative sequences in a doubly fed induction generator (DFIG). The potential risk of electromagnetic oscillation in DFIG-based wind turbine (WT)-dominated power systems (DFIG-WTPS) necessitates small-signal modeling and stability analysis considering time-varying characteristics. However, the traditional linear time-invariant (LTI) modeling method based on Park transformation is no longer suitable. Therefore, this paper applies the linear time-periodic (LTP) modeling method based on trajectory linearization to the small-signal modeling of DFIG- WTPS in electromagnetic timescale. Floquet theory is further introduced to calculate the L TP eigenvalues. Then, the influence of series capacitor and control parameters on small-signal stability is analyzed. Finally, the results from the nonlinear DFIG- WTPS model demonstrate the effectiveness of the proposed analysis.

关键词： Current control Analytical models Stability criteria Power system dynamics Power system stability Eigenvalues and eigenfunctions electromagnetics Phase locked loops Time-varying systems Oscillators

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Prediction of Contact Terminal Temperature of Vacuum Circuit Breaker under Complex and Unknown Boundary Conditions

Prediction of Contact Terminal Temperature of Vacuum Circuit...

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

作者： Yingzhuo Li Lixue Chen Zhao Yuan Shengqin Xu Likang Sun Xinyang Zou State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The monitoring of contact terminal temperature of vacuum circuit breakers is of great significance for fault prediction, life assessment, and structural improvement of circuit breakers. This article proposes a prediction method for steady-state temperature of vacuum circuit breaker's contact based on RBF neural network. Firstly, a finite element simulation model based on the actual characteristics of ZKTD 2S00/36-31.5kV vacuum circuit breakers is built, according to which, 793 electromagnetic and thermal model samples of circuit breakers with different boundary conditions are generated. Then, Random Forest regression, LASSO regression and ReliefF regression are used to rank the importance of temperature measurement points at different locations, based on the ranking results from 3 regression models, 4 optimal temperature measuring points are obtained. While the actual boundary conditions of the vacuum circuit breaker are unknown, the contact terminal temperature is accurately predicted by only using the temperatures of four temperature measuring points and the contact resistance values. Finally, a control experiment was set up to further verify the predictive ability of multiple temperature measuring points for contact terminal temperature under complex and unknown boundary conditions.

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Redundant Strategy of T-Type DC/DC MMC Based on Third Harmonic Injection for Submodule Failure

Redundant Strategy of T-Type DC/DC MMC Based on Third Harmon...

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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Pengfei Tang Dan Wang Hongyu Zhang Ruoxuan Fan Chengxiong Mao State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

In this paper, an endogenous AC optimization strategy for T-type topology DC/DC MMC(TDC-MMC) is proposed and applied to the protection strategy for sub-module faults. The endogenous AC model of TDC-MMC is established under the dq coordinate system. Based on this model, two endogenous AC strategies are derived under the conditions of loss minimization and voltage minimization, respectively. The optimization of endogenous AC is achieved by further introducing the third harmonic and redefining the voltage vector relationship under the minimum voltage condition. The optimal amplitude and phase of the third harmonic for each bridge arm are then determined. In a simulation of a 3 kV/1 kV DC transmission system, the working principle of the strategy is verified by applying the protection strategy to the sub-module fault cases of the HV Arm, MV Arm and LV Arm.

关键词： Simulation Bridge circuits Switches Minimization Harmonic analysis Transformers Vectors Topology Protection Optimization

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Nonparametric Sliding Mode Predictive Current Control for Linear Induction Motor

Nonparametric Sliding Mode Predictive Current Control for Li...

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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Yingcong Guo Wei Xu Han Xiao Jian Ge School of Electrical Engineering Southwest Jiaotong University Chengdu China Key Laboratory of High Density Electromagnetic Power and Systems Chinese Academy of Sciences Institute of Electrical Engineering Beijing China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

Model predictive control (MPC) enables the linear induction motor (LIM) drive system to maintain good performance despite large distortions in the input voltage waveform, and is particularly suitable for applications with lower converter switching frequencies, such as urban rail transit. However, the parameters of the LIM vary dramatically due to the end effect, which reduces the control performance of the MPC. This paper presents a nonparametric sliding mode predictive current control method to enhance the parametric robustness of MPC. The cost function of nonparametric current control is constructed to overcome the limitation of model predictive control, which is greatly affected by parameter accuracy. The simulation results show that the proposed method can maintain the good control performance of the LIM drive system under the condition of inaccurate parameters, effectively improve the robustness of the system, and has certain engineering significance.

关键词： Current control Rails Electrical engineering Induction motors Switching frequency Simulation Cost function Robustness Voltage control Predictive control

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