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

作者： He, Sijing 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

The front-end signal synthesis has a great influence on the detection and control accuracy of the Low-Level Radio Frequency control system. It is used as the signal source of the control system and the access port connected with the Radio Frequency system. It generated the operation frequency signal, the local oscillator signal, and the clock signal. This paper analyzed the principle of the synthesis module, studied the harmonics and phase noise models, and completed the design of the signal synthesis hardware scheme. On this basis, MATLAB/Simulink modeled and simulated the entire signal synthesis module, and the device test was carried out according to the hardware scheme, and the signals output with high stability and low phase noise were realized. © 2020 IEEE.

关键词： Radio waves

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Adaptive form of generator stator ground fault protection for the floating nuclear power plant grid-source direct connection system 1

Adaptive form of generator stator ground fault protection fo...

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

作者： Xu, Wen Yin, Xianggen Wang, Yikai Qiao, Jian 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

Due to the high concentration of electricity generation and distribution in the floating nuclear power plant grid-source direct connection system, the generator stator ground fault protection is affected by the direct connection power grid. Traditional protection methods cannot distinguish the fault direction and are difficult to guarantee the extreme safety requirements of the nuclear islands. This paper analyzes the system ground fault, points out the limitations of the existing generator stator ground protection methods, and proposes an adaptive form of generator stator ground fault protection method. Based on the phase-current differential, the method can effectively distinguish the faults inside or outside the generator, which can also form the protection criterion and action strategies according to the fault degree. It can trip the generator smoothly under slight fault conditions, ensuring the safe and stable operation of the floating nuclear power plant. Simulation in PSCAD/EMTDC proves that the proposed method can effectively realize the selective coordination of the ground fault protection for the grid-source direct connection system. © 2020 IEEE.

关键词： Nuclear power plants

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Research on wireless transmission performance of near-drill magnetic field 1

Research on wireless transmission performance of near-drill ...

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

作者： Jiang, Tao Ma, Keqi Li, Hongbin Chen, Qing Han, Xiong Pang, Dongxiao Wang, Qiang 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 wireless transmission of near-bit signal can improve the accuracy of drilling trajectory control and increase the drilling speed, thereby bringing huge economic benefits. This paper establishes a wireless transmission model of magnetic field signals near the drill bit through ANSYS software to conduct finite element analysis. Through the controlled variable method, study the influence of the coil core and the coil cover on the magnetic field transmission performance. It is also pointed out that the slit cutting treatment of the coil cover can effectively reduce the eddy current loss, thereby improving the magnetic field transmission performance. At the same time, slit cutting can significantly increase the range of selectable excitation frequencies. © 2020 IEEE.

关键词： Finite element method

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Six - Phase Motor fault-tolerant control based on deadbeat predictive current control 1

Six - Phase Motor fault-tolerant control based on deadbeat p...

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

作者： Xu, Lei Xu, Qiang Huang, Muxing 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

Aiming at the single-phase open circuit fault of a six-phase permanent magnet synchronous motor(PMSM), take the neutral point of two sets of windings connected and not connected to the inverter as an example. Based on the principle of constant stator magnetomotive force, solve the residual phase current at the stator end and then establish the mathematical model of the remaining five-phase windings, and use the corresponding transformation matrix to construct a new rotating coordinate system for vector decoupling, and propose the vector of the six-phase motor under one-phase open circuit fault control strategy. In order to further improve the control effect after a phase failure, a deadbeat predictive current control strategy is proposed, which discretizes the mathematical model of the motor, and uses a current prediction controller to replace the traditional PI current regulator to achieve the deadbeat predictive current control of six - phase PMSM under phase failure. And based on Matlab/Simulink to complete simulation modeling and comparative analysis to verify the feasibility of the control strategy. © 2020 IEEE.

关键词： Stators

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Research on temperature field of all-film pulsed capacitors in application of repetitive pulse discharge 1

Research on temperature field of all-film pulsed capacitors ...

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

作者： Feng, Bingyang Li, Yuansheng He, Mengbing 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 order to obtain the temperature field distribution of the all-film pulsed capacitors (AFPCs) under repetitive high-voltage pulse discharge conditions, we analyze the internal structure of the AFPC, and establish the temperature field simulation model. Based on the FEA, we obtain the overall temperature field distribution of the AFPC, and the relationship between discharge voltage, frequency, and temperature rise. This model can be used to evaluate the temperature rise characteristics of an AFPC in repetitive high-voltage pulse discharge and has certain guiding significance for the safe operation. © 2020 IEEE.

关键词： Finite element method

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Real-time evaluation method for measurement error of capacitor voltage transformer 1

Real-time evaluation method for measurement error of capacit...

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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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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.

关键词：

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Deciphering the roles of bacterial and fungal communities in the formation and quality of agarwood

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Stress Biology 2024年第1期4卷 187-204页

作者： Chen-Chen Fu Bao-Xing Huang Shan-Shan Wang Yu-Chen Song Dolkar Metok Yu-Xiang Tan Tai-Ping Fan Alisdair RFernie Meisam Zargar Yan Wang Mo-Xian Chen Liang-Wen Yu Fu-Yuan Zhu State Key Laboratory of Tree Genetics and Breeding the Southern Modern Forestry Collaborative Innovation CenterKey Laboratory of State Forestry and Grassland Administration on Subtropical Forest Biodiversity ConservationCollege of Life SciencesNanjing Forestry UniversityNanjing 210037China Clinical Laboratory Shenzhen Children’s HospitalShenzhen 518000China Dongguan Institute of Guangzhou University of Chinese Medicine Dongguan Institute of Guangzhou University of Chinese MedicineDongguan 523808China Guangdong Province Key Laboratory for Biotechnology Drug Candidates Institute of Basic Medical Sciences and Department of BiotechnologySchool of Life Sciences and BiopharmaceuticsGuangdong Pharmaceutical UniversityGuangzhou 510006China CAS Key Laboratory of Quantitative Engineering Biology Shenzhen Institute of Synthetic BiologyShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Department of Pharmacology University of CambridgeCambridgeUK School of Health Sciences Fuyao University of Science&TechnologyFuzhou 350000China Max Planck Institute of Molecular Plant Physiology Am Muhlenberg 114476 Potsdam-GolmGermany Department of Agrobiotechnology Institute of AgricultureRUDN University117198 MoscowRussia Science and Technology Innovation Center Guangzhou University of Chinese MedicineGuangzhouGuangdong 510405China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China.

Aquilaria sinensis is a significant resin-producing plant worldwide that is crucial for agarwood *** has different qualities depending on the method with which it is formed,and the microbial community structures that are present during these methods are also ***,the microbial communities of plants play crucial roles in determining their health and *** previous studies have investigated the impact of microorganisms on agarwood formation,they lack comprehensiveness,particularly regarding the properties of the microbial community throughout the entire process from seedling to adult to incense *** collected roots,stems,leaves,flowers,fruits and other tissues from seedlings,healthy plants and agarwood-producing plants to address this gap and assess the dominant bacterial species in the microbial community structures of *** at different growth stages and their impacts on growth and agarwood *** bacteria and fungi in these tissues were classified and counted from different *** samples were sequenced using the Illumina sequencing platform,and sequence analyses and species annotations were performed using a range of bioinformatics tools to assess the plant community *** additional comparison of the samples was conducted using diversity analyses to assess their *** research revealed that Listeria,Kurtzmanomyces,Ascotaiwania,Acinetobacter,Sphingobium,Fonsecaea,Acrocalymma,Allorhizobium,Bacillus,Pseudomonas,Peethambara,and Debaryomyces are potentially associated with the formation of ***,the data provided in this article help us understand the important roles played by bacteria and fungi in the growth and agarwood formation process of ***,will support the theoretical basis for the large-scale cultivation of ***,and provide a basis for further research on microbial community applications in agarwood production and beyond.

关键词： Aquilaria sinensis Endophytic Exophytic Fungi Bacteria Plant tissue

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Frequency coupling of asymmetrical VSC-dominated power systems in small-signal dynamic analysis 1

Frequency coupling of asymmetrical VSC-dominated power syste...

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

作者： Zhou, Rong Yuan, Xiaoming Li, Sheng 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 frequency coupling has brought great challenges to the small-signal dynamic analysis of the VSC-dominated power systems. However, few have cognized the essence of the frequency coupling, especially its inner relationship with the asymmetry of the system. Thus, this paper will emphatically study the frequency coupling of the asymmetrical VSC-dominated power systems in the small-signal dynamic analysis. First, this paper will summarize the asymmetrical factors of VSC and the power network. Then, the effects of the system's asymmetry on the frequency coupling will be analyzed. The results indicate that the asymmetry of VSC and the power network can induce the frequency coupling of the linearized VSC-dominated power systems. Moreover, the utilized coordinate for system modeling and analysis have great effects on the frequency coupling. Therefore, by choosing the appropriate coordinate according to the asymmetries of VSC and the power network, this system can also be modeled and analyzed with the linear time invariant (LTI) methods, rather than the complicated linear time periodic (LTP) methods. Eventually, the time domain simulations will verify the correctness of the analysis. © 2020 IEEE.

关键词： Electric network analysis

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Simulation analysis of electromagnetic interference of high-voltage pulse source 1

Simulation analysis of electromagnetic interference of high-...

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

作者： Zhang, Mengyu He, Mengbing 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, the electromagnetic interference of a high voltage pulse discharge device is simulated and analyzed. The interference source, transmission route, and sensitive equipment are identified. The electromagnetic interference (EMI) problem is analyzed in detail by using the field-circuit cooperative electromagnetic simulation software CST. The simulation results show the voltage coupling caused by the high voltage of the main discharge to the electronic circuit of the control module, and the interference caused by the external electromagnetic pulse to the internal cable. Besides, through the simulation of the shielding effectiveness of the enclosure, some suggestions are given so that this kind of enclosure can resist electromagnetic interference from both outside and inside. By referring to the simulation of the electromagnetic interference mentioned in this paper, readers can get the ideas and methods of how they can use CST to deal with similar electromagnetic interference problems in their own device. This paper also shed light on the approach to distinguish the key elements of electromagnetic interference in similar devices or situations that contain both high power equipment and low power electronic equipment. © 2020 IEEE.

关键词： Cables

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