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

作者： Ma, Keqi Jiang, Tao Li, Hongbin Meng, Zhan Chen, Qing 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

As one of the electrical parameters measuring devices, capacitor voltage transformer (CVT) is widely used in the grid with a voltage of 110kV and above. It provides reliable basis for electric energy measurement, state monitoring and relay protection, thus related to the safety, stability and economic operation of the power system. The existing measurement error evaluation methods are not conducive to timely evaluate the error of CVTs. Therefore, a real-time error evaluation method for CVTs based on same-phase voltage correlation and large-dimensional random matrices (SPVC-LDRM) is proposed. Collect same-phase voltage measurement data of CVTs, extract the error state characteristic parameters for CVTs based on the same-phase voltage correlation, and construct a large-dimensional random matrices model, then the evaluation index and its threshold are calculated to evaluate the error anomaly of CVTs in real time according to single-ring law. The simulation experiment verifies the effectiveness of the method in evaluating the measurement error of the CVTs. © 2020 IEEE.

关键词： Measurement errors

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Elastic properties of Cu-6wt%Ag alloy wires for pulsed magnets investigated by ultrasonic techniques

arXiv

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arXiv 2024年

作者： Li, Ziyu Gu, Tianyi Wei, Wenqi Yuan, Yang Wang, Zhuo Luo, Kangjian Pan, Yupeng Xie, Jianfeng Zhang, Shaozhe Peng, Tao Liu, Lin Chen, Qi Han, Xiaotao Luo, Yongkang Li, Liang Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China School of Physics Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China School of Materials Science and Engineering State Key Lab for Materials Processing and Die & Mold Technology Huazhong University of Science and Technology Wuhan430074 China

Conductor materials with good mechanical performance as well as high electrical- and thermal-conductivities are particularly important to break through the current bottle-neck limit (∼ 100 T) of pulsed magnets. Here we perform systematic studies on the elastic properties of the Cu-6wt%Ag alloy wires, a promising candidate material for the new-generation pulsed magnets, by employing two independent ultrasonic techniques - resonant ultrasound spectroscopy (RUS) and ultrasound pulse-echo experiments. Our RUS measurements manifest that the elastic properties of the Cu-6wt%Ag alloy wires can be improved by an electroplastic drawing procedure as compared with the conventional cold drawing. We also take this chance to test the availability of our newly-built ultrasound pulse-echo facility at Wuhan National High Magnetic Field Center (WHMFC, China), and the results suggest that the elastic performance of the electroplastically-drawn Cu-6wt%Ag alloy wire remains excellent without anomalous softening under extreme conditions, e.g., ultra-high magnetic field up to 50 T, nitrogen / helium cryogenic liquids. © 2024, CC BY.

关键词： Bottles

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Experimental Study on Influencing Factors of Seebek Coefficient by Using Nicr/Nisi Thin Film Thermocouple Prepared and Calibrated

SSRN

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SSRN 2024年

作者： Liu, Zhihui Shen, Kai Cheng, Yongjun Wang, Bi Zhou, Jiankang Wu, Mengxuan Sun, Yi Ding, Wanyu Wang, Zixi State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China College of Materials Science and Engineering Dalian Jiaotong University Dalian116028 China Engineering Research Center of Continuous Extrusion Ministry of Education Dalian Jiaotong University Dalian116028 China Laboratory of Low frequency Electromagnetic Communication Technology The WMCRT CSSC China State Key Laboratory of High-end Compressor and System Technology Anhui Hefei230031 China

Accurate calibration of the Seebeck coefficient is crucial for reliable temperature measurements using thin-film thermocouples. In this study, we investigate the calibration of NiCr/NiSi thin-film thermocouples for precise temperature measurements. Using the magnetron sputtering method, we prepared a series of NiCr/NiSi film thermocouples and obtained their Seebeck coefficients through standard calibration procedures. The results demonstrate good consistency and reproducibility of the thermoelectric output within the temperature range of 0°C to 505°C. Notably, the Seebeck coefficients remain nearly constant regardless of changes in the top and bottom order or resistance values of the NiCr and NiSi thermoelectrodes. Furthermore, we found that the addition of an SiO2 protective film does not affect the calibration Seebeck coefficients of the NiCr/NiSi film thermocouples, with values of 7.94 μV/°C and 7.96 μV/°C for film thermocouples with and without SiO2, respectively. These findings provide valuable insights into the calibration of thin-film thermocouples and can enhance the accuracy of temperature measurements. The study contributes to scientific research and engineering applications in the field of thin-film thermocouple calibration. © 2024, The Authors. All rights reserved.

关键词： Seebeck coefficient

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A New Excitation Power Supply for Large Capacity Superconducting Condenser

A New Excitation Power Supply for Large Capacity Superconduc...

引用

International Conference on Electrical Machines and Systems (ICEMS)

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

Superconducting condenser has the characteristics of small excitation resistance and small transient and sub transient reactance. Therefore, compared with conventional condenser, superconducting condenser can output greater reactive power and has better reactive power compensation characteristics. Just like the conventional condenser, the superconducting condenser also needs to be equipped with its supporting excitation power supply. At present, there is less research on the excitation power supply of the superconducting condenser. Therefore, this paper proposes a new excitation power supply system relative to the superconducting condenser, which lays a theoretical foundation for the future research work. Firstly, the structural characteristics of the 10M var HTS condenser are described, and the characteristics of the excitation winding are defined; Secondly, based on the characteristics of the excitation winding, a new design scheme of excitation power supply system is proposed: the scheme can achieve the separation of forced excitation module and constant excitation module, and the forced excitation module uses uncontrolled rectifier to provide high voltage and strong current; Constant excitation module uses four intersecting and staggered parallel buck circuit as low ripple power supply, which can not only ensure the speed of forced excitation, but also ensure the high precision requirements of constant excitation. Finally, Matlab / Simulink simulation software is used to verify the feasibility of the excitation system.

关键词： Resistance High-temperature superconductors Reactive power Power supplies Software packages Windings Rectifiers

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Short Circuit Calculation Method of Power System with Renewable Energy Sources and Experimental Verification

Short Circuit Calculation Method of Power System with Renewa...

引用

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

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

ISBN: (纸本)9781665434263

In the short-circuit current calculation of power grid, the renewable energy sources (RES) cannot use the equivalent method similar to the traditional synchronous generator because of the access mode and low voltage ride through control strategy. Therefore, it is difficult to solve the short circuit current directly by the traditional fault analysis method. According to the control strategy and fault characteristics of different types of RES, the equivalent calculation model of RES is obtained, especially the equivalent calculation model of doubly fed power sources when the negative sequence short-circuit current is not zero. On this basis, the node voltages equation and the iterative calculation method of the short-circuit current for the power grid with different types of RES are given. Then, an experimental platform with RES is established. The correctness of the equivalent calculation model and the iterative calculation method of short-circuit current are verified by short-circuit experiment.

关键词： Renewable energy sources Low voltage Short-circuit currents System integration Power grids Mathematical models Synchronous generators

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A Two-stage Electric Energy Scheduling Strategy for Pelagic Island Microgrid Clusters

A Two-stage Electric Energy Scheduling Strategy for Pelagic ...

引用

IEEE Asia Power and Energy engineering Conference (APEEC)

作者： Quan Sui Fanrong Wei Xiangning Lin Zhengtian Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Electric vessels (EVs) can achieve interisland energy transmission among pelagic island microgrid clusters (PIMGCs) by charging or discharging. However, the renewable generation uncertainties may impact the operational economy of PIMGGs integrating EVs. To address the problem, this paper proposes a two-stage electric energy scheduling strategy. First, by analyzing the power regulation and sailing characteristics of an EV, an interisland spatial-temporal energy transmission model is established. Additionally, a two-stage electric energy scheduling model integrating the network constraints is proposed, where the day-ahead stage optimizes the EV travel trajectory decisions, and the intra-day stage manages the unit and EV power using the model prediction control (MPC) method. On this basis, this optimization model is converted into a classic mixed-integer second-order cone programming (MI-SOCP) problem, and efficiently solved by commercial solver. Simulation studies on pelagic islands in South China Sea indicate that the proposed scheduling strategy is effective and beneficial for PIMGCs.

关键词： Reactive power Uncertainty Power supplies Simulation Microgrids Predictive models Programming

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

Transmission expansion planning considering customer interes...

引用

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.

关键词：

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

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

引用

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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Research on transient interaction mechanism of two PMSG considering different nodes and network characteristics 1

Research on transient interaction mechanism of two PMSG cons...

引用

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

作者： Mao, Zichen Yuan, Xiaoming State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781728196596

Compared with the traditional AC power system, high proportion of renewable generation and power electronics are the characteristics of the power electronic dominated power system. The multi-time scale problem of the dynamical problems becomes prominent. There are complex interactions between power electronics. First, this paper describes the multi-time scale control links of equipment in the power electronic dominated power system and the mechanism of the multiscale with the example of permanent magnetic synchronous generator (PMSG).Second, a multi-time scale nesting model for analyzing interaction is proposed. Finally, the phenomenon of multi-time scale interaction between two PMSG is explained by simulation, and the influence of different node and network characteristics on the degree of interaction is explored, which provides references for subsequent analytical analysis. © 2020 IEEE.

关键词： Synchronous generators

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Research on supersonic and subsonic vacuum arc simulation 1

Research on supersonic and subsonic vacuum arc simulation

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

作者： Sun, Ke Dai, Ling Xiang, Lingfeng Lin, Fuchang 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

In this paper, according to the magnetohydrodynamic (MHD) model of vacuum arc, vacuum arc is regarded as a two-fluid model of mixing electrons and ions, and the momentum equation, mass equation and energy equation of the fluid are coupled with the magnetic transfer equation and Maxwell equations. After that, the momentum equation and energy equation are secondary developed in Fluent, and the momentum equation and energy equation in Fluent are modified. According to the different characteristics of supersonic arc and subsonic arc, different anode boundary, cathode boundary and side boundary, namely fluid wall boundary conditions are set, and supersonic arc and subsonic arc are solved in fluent. The relationship between arc current and arc pressure, arc density, arc velocity and axial current density in supersonic arc and subsonic arc is obtained. © 2020 IEEE.

关键词： Electrodes

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