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10th Frontier Academic Forum of Electrical Engineering, FAFEE 2022

作者： Wang, Lili Yu, Liang Liu, Hongmei Dong, Shoulong Yao, Chenguo State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing400044 China

ISBN: (纸本)9789819934034

The effect of high voltage pulsed electric field on the electroporation of plant and animal cells has been widely used in tumor ablation, food sterilization, and biodiesel extraction, but the effect of pulsed electric field on pathogenic virus without intact cell structure has not been effectively studied. In this paper, we conducted a preliminary study on the effect of sub-microsecond pulsed electric field on virus, using 1000 sub-microsecond pulses of 20 kV/cm with different pulse width (200/500/1000 ns) at a heavy frequency of 10 Hz to treat lentivirus. Besides, we also examined the temperature and pH changes of virus suspension before and after the electric treatment, excluding the effect of temperature and electrolysis. The effect of lentivirus infection of HEK392T was studied comparatively by fluorescence microscopy and flow cytometry. The results of the experiment show that the temperature during the electric treatment and pH before and after the treatment do not change significantly. The sub-microsecond high-voltage pulsed electric field can significantly inhibit the infectivity of lentivirus by disrupting its structural integrity, and the inhibition effect is positively correlated with pulse width. © Beijing Paike Culture Commu. Co., Ltd. 2023.

关键词： Viruses

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Effect of Types and Orders of Electromagnetic Field Finite Element Meshes on Power Communication Harmonic Parameters Calculation Results of Tubular Hydrogenerators

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China Communications 2024年第10期21卷 288-300页

作者： Fan Zhennan Chen Jie Zhou Zhiting Yang Yong Key Laboratory of Fluid and Power Machinery Ministry of EducationXihua UniversityChengdu 610039China State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044China KeyDongfang Electric Machinery Co. Ltd Research and Test CenterDeyang 618000China

In generator design field,waveform total harmonic distortion(THD)and telephone harmonic factor(THF)are parameters commonly used to measure the impact of generator no-load voltage harmonics on the power communication *** hydrogenerators are considered the optimal generator for exploiting low-head,high-flow hydro resources,and they have seen increasingly widespread application in China's power systems recent ***,owing to the compact and constrained internal space of such generators,their internal magnetic-field harmonics are ***,accurate calculation of their THD and THF is crucial during the analysis and design stages to ensure the quality of power *** in the electromagnetic field finite element modeling analysis of such generators,the type and order of the finite element meshes may have a significant impact on the THD and THF calculation results,which warrants in-depth *** address this,this study takes a real 34 MW large tubular hydrogenerator as an example,and establishes its electromagnetic field finite element model under no-load *** types of meshes,five mesh densities,and two mesh orders are analyzed to reveal the effect of electromagnetic field finite element mesh types and orders on the calculation results of THD and THF for such generators.

关键词： calculation results electromagnetic field finite element meshes power communication harmonic parameters tubular hydrogenerator types and orders

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Research on Low Voltage Ride-through Control Strategy of VSG under Weak Grid Condition 6

Research on Low Voltage Ride-through Control Strategy of VSG...

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6th International Conference on Power and Energy technology, ICPET 2024

作者： Song, Ziang Cai, Tao Wu, Junling Dai, Qian He, Song State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China Power System Department China Electric Power Research Institute Beijing China

ISBN: (纸本)9798350375855

In recent years, as the proportion of renewable energy in the grid increases, more adaptive grid-forming technologies for weak grid have been proposed, among which the Virtual Synchronous Generator (VSG) strategy is the most widely used. It provides a friendly grid-connected method for renewable energy sources, such as wind power and photovoltaic. However, traditional VSG is prone to be overcurrent and out of use during grid faults. In this paper, the static and transient characteristic of the VSG during symmetrical grid fault is analyzed based on its basic model. And then a Low-Voltage Ride-Through (LVRT) control method by improving the VSG power loop while combining the virtual impedance is proposed. Based on Matlab/Simulink, a simulation model of a microgrid with VSG grid-connected is constructed, and the effectiveness of the strategy proposed in this paper for limiting the transient and steady state overcurrent of VSG during fault, providing reactive power support, as well as maintaining the stable operation of the microgrid system is finally verified. © 2024 IEEE.

关键词： Synchronous generators

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A High-Speed Centerline Extraction Method for Multiple Laser Stripe based on Hessian Matrix

A High-Speed Centerline Extraction Method for Multiple Laser...

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International Conference on Biomimetic Intelligence and robotics & Medical robotics Forum, ICBIR+MRF 2024

作者： Shi, Juntian Guo, Weichao Sheng, Xinjun State Key Laboratory of Mechanical System and Vibration School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China Meta Robotics Institute Shanghai Jiao Tong University Shanghai200240 China

Laser centerline extraction is a critical step in the machine vision-aided measurement process, especially in the field of aerospace drilling and riveting. We propose a novel and efficient algorithm for the extraction of multiple laser centerlines, which consists of three major parts: laser linewidth estimation, ROI (Region of Interest) extraction, and precise positioning. In the linewidth estimation part, a method based on second-order moment is used to estimate the linewidth, and the scanning frame to linewidth ratio is adopted as the convergence condition to achieve a stable estimation result. In the ROI extraction part, we use a scanning frame to perform raster scanning on the entire image, and calculate the feature function threshold based on the sampling and grayscale volume method to complete ROI extraction. In the precise positioning part, we employ an improved method based on the Hessian matrix to reduce computation time, and use a λ filtering method to eliminate noise. Finally, the K-means method is used to classify the center points belonging to different laser centerlines, and RANSAC is utilized to perform line fitting. The final results demonstrate that the proposed algorithm has certain improvements in accuracy and also exhibits high computational efficiency. © 2024 The Authors.

关键词： Linewidth

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Simulation and Experimental Study on Damage of Subcellular Structure by High Voltage and Extremely Short Pulse Electric Field 10th

Simulation and Experimental Study on Damage of Subcellular S...

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10th Frontier Academic Forum of Electrical Engineering, FAFEE 2022

作者： Ma, Xin Wang, Yancheng Chen, Yue Dong, Shoulong Yao, Chenguo State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China

ISBN: (纸本)9789819934034

In order to explore the bioelectric effect of high-voltage extremely short pulse electric fields (esPEFs) on tumor cells, first, based on the finite element platform, a spherical single-cell Multiphysics model was established. Both electroporation and dielectric relaxation of the membrane are considered. The electroporation effects and Maxwell stress tensors on cell and nuclear membranes were analyzed;secondly, taking MDA-MB-231 cells as the research object, combined with fluorescent probe technology, The state change and fluorescence dissipation of its subcellular structure exposed to esPEFs were studied. The results show that high-pressure esPEFs preferentially act inside the cell, causing electroporation effect and tensile stress on the nuclear membrane;it destroys the integrity and order of the cytoskeleton, and damage the subcellular structural functions of the endoplasmic reticulum, mitochondria, and nucleus. The degree of damage is positively correlated with the pulse dose. © Beijing Paike Culture Commu. Co., Ltd. 2023.

关键词： Probes

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A Power-to-Gas Model Considering the Waste Heat Compensation for Power system Application 3

A Power-to-Gas Model Considering the Waste Heat Compensation...

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2023 3rd International Conference on Energy, Power and Advanced Thermodynamic systems, EPATS 2023

作者： Hu, Bohan Huang, Zhi Lin, Danning Lei, Xingyu State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China

Power-to-Gas (P2G) technology is a crucial enabler for the new energy-based power system. In this study, a daily economic dispatch model is proposed for the power system operation with P2G units. It incorporates collecting and utilizing waste heat generated by the methanation plant and connected with the Proton exchange membrane (PEM) electrolysis. The simulation results demonstrate that the proposed model achieves a 1.1% decrease in power system operation costs compared to the conventional P2G model. This paper provides valuable insights into the power systems optimization with P2G units for more efficient and cost-effective renewable energy integration into the power grid. © Published under licence by IOP Publishing Ltd.

关键词： Waste heat

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A NOVEL TOPOLOGY INTERGRATING DC FAULT ISOLATION AND AC/DC FAULT RIDE-THROUGH 12

A NOVEL TOPOLOGY INTERGRATING DC FAULT ISOLATION AND AC/DC F...

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12th Annual Meeting of CSEE Study Committee of HVDC and Power Electronics, HVDC 2023

作者： Ding, Shuai Yang, Ming Sima, Wenxia Tao, Yuan Sun, Potao the State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China

ISBN: (纸本)9781839539848

Bipolar modular multilevel converter (MMC) based multi-terminal flexible DC transmission system (MTDC) has been the preferred choice for the regional sharing of wind power. The dc fault isolation and dc fault ride-through during dc faults is one of the greatest challenges, the methods used to interrupt fault current and dissipate surplus wind power are indispensable. In this article, a novel topology with the cooperation of control strategy is proposed, which achieves dc fault isolation and dc fault ride-through under the dc faults occur on the dc transmission line (DCTL) and ac fault ride-through under the ac fault occurs on the grid-side MMC (GSMMC) ac network. Based on the simulation of four-terminal MTDC, it can be verified that the proposed topology can reduce 20 % utilization of power electronic devices to ensure the operation of the healthy area under the fault area isolation. © The Institution of Engineering & technology 2023.

关键词： Topology

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Low-overhead fault-tolerant error correction scheme based on quantum stabilizer codes

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Chinese Physics B 2022年第4期31卷 143-150页

作者： Xiu-Bo Chen Li-Yun Zhao Gang Xu Xing-Bo Pan Si-Yi Chen Zhen-Wen Cheng Yi-Xian Yang Information Security Center State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and TelecommunicationsBeijing 100876China School of Information Science and Technology North China University of TechnologyBeijing 100144China Advanced Cryptography and System Security Key Laboratory of Sichuan Province Chengdu 610025China

Fault-tolerant error-correction(FTEC)circuit is the foundation for achieving reliable quantum computation and remote ***,designing a fault-tolerant error correction scheme with a solid error-correction ability and low overhead remains a significant *** this paper,a low-overhead fault-tolerant error correction scheme is proposed for quantum communication ***,syndrome ancillas are prepared into Bell states to detect errors caused by channel *** propose a detection approach that reduces the propagation path of quantum gate fault and reduces the circuit depth by splitting the stabilizer generator into X-type and ***,a syndrome extraction circuit is equipped with two flag qubits to detect quantum gate faults,which may also introduce errors into the code block during the error detection ***,analytical results are provided to demonstrate the fault-tolerant performance of the proposed FTEC scheme with the lower overhead of the ancillary qubits and circuit depth.

关键词： fault-tolerant error correction quantum stabilizer code gate fault quantum circuit

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A Comprehensive and Efficient Instruction-level Testing Method for Processor 17

A Comprehensive and Efficient Instruction-level Testing Meth...

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17th IEEE International Conference on Solid-state and Integrated Circuit technology, ICSICT 2024

作者： Yang, Zixin Wei, Zhichao Luo, Huanlin Wang, Jian Lai, Jinmei School of Microelectronics Fudan University State Key Laboratory of ASIC and System Shanghai201203 China Shanghai Academy of Spaceflight Technology Shanghai201109 China

ISBN: (纸本)9798350361834

Testing of the processor is crucial, which necessitates a comprehensive test set to ensure an efficient and thorough coverage. We herein propose an Equivalence Class Partitioning and Boundary Value Analysis (ECP-BVA) constrained instruction stream generation method on coverage-guided fuzzing (CGF). The updated ECP-BVA constraints mutate the instruction field to maximize the coverage metrics. The accelerated coverage-guided fuzzing skipes redundant instructions to improve the testing efficiency. An efficient test set is built by fuzzing and the experimential results indicate that our method can maximize coverage metrics close to 100% in a short time, thereby ensuring a comprehensive and efficient coverage for processor testing. © 2024 IEEE.

关键词： Equivalence classes

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Junction Temperature Measurement Method for SiC MOSFET Based on Charge Variation 17th

Junction Temperature Measurement Method for SiC MOSFET Based...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Wu, Shuo Sun, Pengju Li, Kaiwei State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing400044 China

ISBN: (纸本)9789819903566

Reliable measurement of the junction temperature Tj is important for the safe operation and reliability assessment of power semiconductors. In this paper, a junction temperature measurement method based on charge variation is proposed for SiC MOSFET half-bridge circuit. Based on the physical properties of the wide bandgap semiconductor and the reverse recovery characteristics of the body diode, the relationship between the charge variation during each stage of the switching transient and the junction temperature of the corresponding device is theoretically analyzed. Then, a dynamic switching characteristic test platform is built for verification. The effects of load current, bus voltage, and gate resistance on the measurement results are evaluated. Finally, the online feasibility of the proposed method is discussed through the developed charge detection circuit, and it is compared with existing temperature-sensitive electrical parameters. The results show that the proposed method has high linearity, good sensitivity, and can reflect the temperature information of both devices from the same bridge arm simultaneously. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Junction temperature

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