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6th International Conference on Energy, Power and Grid, ICEPG 2024

作者： Zhang, Jin Wang, Yingying Chen, Xiangwen Li, Zhao Wu, Wenhao Lin, Xiangning Central China Branch of State Grid Corporation of China Hubei Province Wuhan430070 China Lamor Innovation Studio of Liu Huanzhang Hubei Province Wuhan430070 China China Three Gorges University College of Electrical Engineering and New Energy Hubei Province Yichang443002 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798350377798

Large-scale photovoltaic grid connection will bring serious challenges to the adaptability of traditional relay protection, and distance protection is the first to bear the brunt due to its weak feeding effect. In this regard, this paper made the following improvements to the traditional distance protection scheme. For the protection of the large grid side, based on the negative and zero sequence networks under faults, a short-circuit impedance algorithm independent of the transition resistance size was constructed to solve the fault distance by using the sequence current conditions constructed by the negative sequence current suppression strategy of the photovoltaic field station side and the zero sequence current branching coefficients which were not affected by the control strategy of the photovoltaic inverter. When the protection on the grid side recognizes that the fault occurred in the zone and tripped the breakers, the feeding effect on the fault point disappeared and the virtual synchronizer control strategy was used on the photovoltaic field station side to ensure safe and stable operation during the fault. The protection can thus solve the short-circuit impedance triangle formed by the impedance relay, and then realize the calculation of the short-circuit impedance. The simulation results based on PSCAD/EMTDC show that the proposed scheme eliminates the effect of transition resistance, has high-ranging accuracy, can protect the full length of the line, can act as backup protection in scenarios where the pilot protection is not applicable due to communication failure, and has the role of fault ranging. © 2024 IEEE.

关键词： Synchronous generators

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Unlocking Spatio-Temporal Flexibility of Data Centers in Multiple Regional Peer-to-Peer Energy Transaction Markets

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IEEE Transactions on Power Systems 2025年

作者： Jin, Tianyu Bai, Linquan Yan, Mingyu Chen, Xinyu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China University of North Carolina at Charlotte William States Lee College of Engineering CharlotteNC28223 United States

Recently, the growth of distributed energy resources (DERs) has aroused peer-to-peer (P2P) energy transaction. With abundant flexibility of shifting computational tasks, data centers could participate in the P2P energy transaction market. However, the revenue that one data center receives through participating in regional P2P markets may conflict with that of the whole company owning several geographical data centers. Furthermore, the market clearing would be more complex after considering the latency characteristics of data centers and privacy protection in P2P transactions. This paper proposes an integrated multiple regional P2P energy transaction (MRPET) model, unlocking both the spatial and temporal flexibility of data centers in P2P trading. The detailed models of data centers, especially considering the total delay in processing tasks, are constructed, as well as several operational constraints of prosumers and P2P energy transaction. A two-stage algorithm based on Alternating Direction Method of Multipliers (ADMM) is proposed for joint clearing of the MRPET markets. The proposed models and algorithm are examined in test systems and the results show that more renewable generation could be locally consumed with the re-dispatch of multiple data centers. Reduced costs are achieved for both the data center company and prosumers. The case study also analyzes the impact of task variation and delay cost on the schedule of data centers and market clearing. © 1969-2012 IEEE.

关键词： Commerce

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nBn mid-wavelength infrared photodetectors based on bulk InGaAsSb absorbers

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Optical Materials Express 2025年第4期15卷 717-723页

作者： Cao, Peng Wei, Jiaqi Bentley, Matthew Davison, Nicholas Hu, Yidan You, Minghui Peng, Hongling Wang, Tiancai Zhuang, Qiandong Zheng, Wanhua Laboratory of Solid State Optoelectronics Information Technology Institute of Semiconductors CAS Beijing100083 China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors CAS Beijing100083 China College of Electronic and Communication Engineering University of Chinese Academy of Sciences Beijing101408 China Physics Department Lancaster University LancasterLA1 4YB United Kingdom College of Engineering and Technology Jilin Agricultural University 2888 Xincheng Street Changchun130118 China Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou310024 China

In this paper, we demonstrate an nBn mid-wavelength infrared (MWIR) photodetector with a 100% cutoff wavelength over 4.0 µm based on a high-In composition InGaAsSb absorber on GaSb substrate. A thin AlGaAsSb layer is exploited as the barrier layer to suppress the generation-recombination (G-R) current. Both structural and optical properties of the grown InGaAsSb epilayer are investigated by high-resolution X-ray diffraction (HRXRD) and photoluminescence (PL) measurement. Low dark current density down to 9.9 × 10−5 A/cm2 and 6.5 × 10−2 A/cm2 are obtained at −500 mV under 77 K and 300 K, respectively. Moreover, respective peak responsivity of 0.64 A/W and 0.10 A/W at 2.67 µm are achieved at −500 mV under 77 K and 160 K. These correspond to a peak specific detectivity of 1.06 × 1011 cm·Hz1/2/W and 4.23 × 109 cm·Hz1/2/W, respectively. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： III-V semiconductors

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Accurate Measurement of Pulsed Current Based on Waveform Reconstruction

Accurate Measurement of Pulsed Current Based on Waveform Rec...

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IEEE International Conference on Plasma Science (ICOPS)

作者： N. Yang Y. Liu L. Li F. Lin School of Electrical Engineering Huazhong Univeristy of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong Univeristy of Science and Technology Wuhan China

ISBN: (数字)9798350360912

ISBN: (纸本)9798350360929

The social and economic development, as well as the enhancement of national defense capabilities, have placed increasingly higher demands on the accurate measurement of Pulsed Current. Due to the limitations of the bandwidth of the sensor itself and the nonlinearity of sensitivity, traditional measurement methods for Pulsed Current currently have significant errors. In this paper, we propose a Pulsed Current measurement method based on waveform reconstruction technology. The equivalent sensitivity of the sensor is obtained through Pulsed Current calibration experiments and waveform frequency domain optimization synthesis principles. We then use mathematical derivation to obtain the analytical form of the output waveform of the measurement system, followed by parameter identification, ultimately achieving the accurate reconstruction of the original pulse current waveform in conjunction with the equivalent sensor sensitivity. This method transforms the challenges of low sensor bandwidth and non-linearity of sensitivity into theoretical analysis and mathematical modeling problems, allowing the accurate measurement of Pulsed Current using sensors with non-ideal frequency response characteristics. The experimental results show that this method can accurately measure pulse waveforms, with a decrease in time uncertainty from 1% to 0.5% and a decrease in scale factor from 0.8% to 0.1%.

关键词： Sensitivity Accuracy Uncertainty Pulse measurements Current measurement Measurement uncertainty Bandwidth

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An Improved Crowbar Control Circuit of DFIG during LVRT 4

An Improved Crowbar Control Circuit of DFIG during LVRT

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Li, Jinxin Qiu, Qi Zhan, Meng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology School of Electrical and Electronic Engineering Hubei China

ISBN: (纸本)9781728171494

In recent decades, the installed capacity of wind power is increased greatly, and doubly fed induction generator (DFIG) occupies a dominant position among wind power generators due to its excellent characteristics. However, how to improve the low voltage ride through (LVRT) success rate of doubly fed induction generator during the grid fault especially unsymmetrical grid fault of great value. Based on an improved crowbar control strategy, this paper designs a new control circuit, optimizes the control process, and improves its control speed. Finally, the simulation of MATLAB/Simulink shows that the rationality of this control circuit. © 2021 IEEE.

关键词： Timing circuits

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A Protection Scheme Based on the Current-limiting Reactor Voltage and its Derivation for MMC-MVDC 10

A Protection Scheme Based on the Current-limiting Reactor Vo...

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10th Renewable Power Generation Conference, RPG 2021

作者： Chen, Yiming Chen, Haotian Chen, Wei Jiang, Lang Yin, Xianggen State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781839536069

High-speed and reliable protection is the key to ensure safe operation of DC network. This paper raises a protection scheme based on the current-limiting reactor voltage and its derivation for MMC-MVDC. By analyzing the fault characteristics of MMC-MVDC network, a pick-up criterion based on the reactor voltage is proposed. Based on the different derivation of reactor voltage for pole-to-pole fault, and the different polarity of reactor voltage of two poles between internal and external fault, the protection criteria for internal-external distinguish are put forward. Using the variation of line voltage, the criterion of fault pole selection is realized. The proposed scheme is verified by a four-terminal DC network model. The operation conditions include different fault types, internal and external fault and various fault resistance are considered. The simulation results show that the proposed scheme can selectively and speedily remove all internal faults and it also has a good ability to overcome the effect of fault resistance. © The Institution of engineering and technology.

关键词： Poles

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Concept Design of BU for Mesh-like Constant Current Seafloor Observation Networks 2

Concept Design of BU for Mesh-like Constant Current Seafloor...

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2nd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2021

作者： Fan, Peng Xu, Ying Ren, Li Tang, Yuejin Shi, Jing Li, Jingdong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781665400640

Cabled undersea observation networks have been attracting increasing research attention due to the abilities of abundant power distribution and broad bandwidth communication. Stability of their power supply systems is crucial for their normal operation. However, rare studies were carried out on constant current (CC) mesh-like undersea observation networks. This paper focuses on designing branching unit (BU) for CC mesh-like seafloor observation network. Firstly, the design concept of CC mesh-like submarine power system is introduced, as well as the equivalent model of power delivery submarine cable and the circuit of CC converters. Then, based on features of the power network, concept of BU for mesh-like CC system is proposed respectively, and reliability protection schemes for various scenarios are analyzed. The model of the observatory network was set in MATLAB, Simulations were carried out, from which results showed good consistence, verifying the theoretical methods. © 2021 IEEE.

关键词： Submarines

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Dual Three-Phase Flux-Modulated Switched Reluctance Motor Drive with Maximum Torque per Ampere Strategy

Dual Three-Phase Flux-Modulated Switched Reluctance Motor Dr...

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作者： Yu, Zhiyue Gan, Chun Ni, Kai Qu, Ronghai Kong, Wubin State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

This article proposes a novel dual three-phase flux-modulated switched reluctance motor (SRM) drive with maximum torque per ampere (MTPA) capability. Different from the existing open-winding structure, the stator winding is in dual three-phase connection, which effectively eliminates the side effects of the zero-sequence harmonic voltage component. Hence, the modulating region of the space vector pulsewidth modulation can be enhanced together with the increase of the dc-link voltage utilization ratio. The mathematical models of the dual three-phase flux-modulated SRM in the stationary reference frame and synchronous rotating reference frame are analyzed in detail. By considering the inductance nonlinearity, the MTPA control strategy is proposed based on the polynomial fitting method, which not only improves the torque capability but also simplifies the calculation of the current control system. The contributions of fundamental and harmonic currents to the electromagnetic torque are considered. By online adjusting the ratio of the dc-biased current component to the ac current component, the torque capacity can be improved. Besides, the effectiveness of the proposed MTPA control strategy can be enhanced by suppressing the harmonic current components caused by distorted back electromotive force. Experimental validations are provided to verify the effectiveness of the proposed SRM drive. © 1972-2012 IEEE.

关键词： Vector spaces

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Application of the interpretable disruption prediction model to the J-TEXT high-density disruption experiment

Application of the interpretable disruption prediction model...

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Energy, Power and Electrical engineering (EPEE), International Conference on

作者： Weijie Lin Chengshuo Shen Li Gao Zhoujun Yang International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics 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)9798331518066

ISBN: (纸本)9798331518073

Nuclear fusion energy generated by magnetic confinement reactors plays a central role in preventing global energy insecurity and atmospheric pollution. Disruption as a plasma instability can terminate the fusion reaction and damage key components. Predicting and mitigating disruption represents one of the pressing challenges for tokamak devices. Moreover, the disruption predictor can be used for more than just predicting disruption owing to the learned disruption physics. In our previous research, an interpretable disruption predictor(IDP-PGFE) was developed to predict disruption and brought a new sight for disruption experiments under RMPs. Electron Cyclotron Resonance Heating (ECRH) can affect the density limit in experiments conducted on J-TEXT. Distinguishing the causes of disruption in high-density experiments under ECRH helps the understanding of physics mechanisms. In this paper, the application of IDP-PGFE in high-density disruption experiments under ECRH has been introduced. Benefiting from strong interpretability, IDP-PGFE can help researchers accurately identify various types of disruptions, including typical density limit disruptions, radiation-enhanced disruptions, and those driven by increased Magnetohydrodynamics (MHD) instabilities. This approach provides valuable insights into the mechanisms underlying disruption events and contributes to advancing disruption prediction capabilities in fusion research.

关键词： Magnetohydrodynamics Pollution Magnetic confinement Pressing Magnetohydrodynamic power generation Predictive models Tokamak devices Resonance Plasmas Physics

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Modeling for Analyzing Practical Oscillation Event of AC/DC Distribution Networks with Power Electronic Transformer 4

Modeling for Analyzing Practical Oscillation Event of AC/DC ...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Liu, Wenkai Zhang, Meiqing Zhan, Meng Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781728171494

In an AC/DC distribution network test of an integrated energy service center in Jiangsu Province, it is found that there is an oscillation phenomenon on the DC side with unclear mechanisms. In order to analyze the practical oscillation phenomenon, this paper proposes detailed models of the AC/DC distribution network, which considers a power electronic transformer (PET), two three-phase voltage-source converters (VSCs), and a buck converter. First, the basic structure and simplified model of the AC/DC distribution network are introduced according to the practical power grid. Then, the topological structure and control method of each equipment is presented in detail, so as to establish the mathematical model of each equipment and the whole AC/DC distribution system. Finally, a simulation model is built on the MATLAB platform to reproduce the oscillation event and further qualitatively analyze the factors affecting the oscillation. These qualitative analysis results provide reasonable suggestions for system operators to ensure the safe and stable operation of AC/DC distribution networks. Moreover, the practical oscillation occurred at AC/DC distribution networks is little reported previously, and thus the practical recording data and detailed models of the AC/DC distribution networks provided in this paper are valuable for academic researchers to in-depth study the oscillation mechanism. © 2021 IEEE.

关键词： MATLAB

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