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6th IEEE International electrical and Energy Conference, CIEEC 2023

作者： He, Tianfeng Wang, Yunchong Yu, Pai Zhejiang University Zhejiang Provincial Key Laboratory of Electrical Machine Systems Department of Electrical Engineering Hangzhou China North China Electric Power University Beijing China

ISBN: (纸本)9798350346671

Synchronous reluctance machines (SynRMs) are widely used in fan and water pump system, due to the high efficiency and low cost. However, low power factor is a major disadvantage which limits the application of SynRMs. To improve the power factor of SynRMs, permanent magnet assisted synchronous reluctance machine (PMa-SynRM) attracted more and more attention. For the PMa-SynRMs, the magnetic characteristics of PMs significantly affect the machine performance. This paper does not study how to change the permanent magnet (PM) magnetic characteristics, but study the influence of PM magnetic characteristics on the performance of the machine and the results can be used to guide the processing of permanent magnetic materials. © 2023 IEEE.

关键词： Permanent magnets

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Multi-Parameter Detection of Defects in HV Cable Buffer Layer Based on Gas, Temperature, and Pressure 14

Multi-Parameter Detection of Defects in HV Cable Buffer Laye...

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14th International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2024

作者： Li, Xiaoshan Tang, Xiaojun Chen, Houqing Gao, Jian Li, Jianying Ren, Zhigang Zhang, Zeyu Liu, Chongzhi Wu, Tong State Key Laboratory of Electrical Insulation and Power Equipment Xian Jiaotong University Xi'an China Xian Jiaotong University State Key Laboratory for Manufacturing Systems Engineering Xi'an China Electric Power Research Institute State Grid Beijing Electric Power Company Beijing China

ISBN: (纸本)9798350374605

High voltage cable is an important part of the power system. Water ingress into the buffer layer and poor contact with the aluminum sheath in high voltage cables can cause ablation defects and local overheating. power accidents due to buffer layer ablation have occurred frequently in recent years. However, there is a lack of effective diagnostic methods for buffer layer ablation defects. To address the above problems, a multi-parameter detection method for ablation defects in the buffer layer of high-voltage cables based on gas, temperature, and pressure analysis is proposed. The volume fraction, temperature, and pressure of the characteristic gases C2H6, C2H4, CO, and H2 are used as the characteristic parameters to characterize the ablation defects of the buffer layer. Infrared spectroscopy was used to analyze the volume fraction of the characteristic gases, a thermocouple sensor was used to measure the temperature, and a piezoelectric sensor was used to measure the pressure. Simulated ablation analysis experiments and actual cable detection verified the method's validity. The results show that with the increase of ablation time, the characteristic gas volume fraction, temperature, and pressure all show an increasing trend. The characteristic gas volume fraction, temperature and pressure in the buffer layer of high-voltage cables with ablation defects in the field are higher than those without ablation. The characteristic gases, temperature, and pressure can be used to characterize the buffer layer ablation defects and to diagnose these defects. It is expected to be a new diagnostic method for buffer layer ablation defects in high voltage cables. It can support the early warning of power accidents and improve the safety of high-voltage cable operation. © 2024 IEEE.

关键词： Ablation

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Enhancing DC Microgrid Stability under Pulsed Load Conditions through Hybrid Energy Storage Control Strategy

Enhancing DC Microgrid Stability under Pulsed Load Condition...

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2023 IEEE Industry Applications Society Annual Meeting, IAS 2023

作者： Aghmadi, Ahmed Ali, Ola Mohammed, Osama A. Florida International University Energy Systems Research Laboratory Department of Electrical and Computer Engineering MiamiFL33174 United States

ISBN: (纸本)9798350320169

Despite the increasing prevalence of DC microgrids, they encounter instability issues due to imbalances in supply and demand, especially when dealing with specific loads such as pulse load or variable pulse load. The system faces severe changes which reduce the effectiveness of typical PV-Battery control systems. The solution to this problem frequently involves the use of energy storage devices such as supercapacitors SCs. When exposed to transients, batteries risk having their lifespans shortened and are challenged in keeping the stability of DC bus voltage and reducing overall transients. In order to increase the stability of DC microgrids and thereby increase their reliability and resilience, it is possible to combine the advantages of batteries and supercapacitors. Integrating both batteries and supercapacitors effectively enables DC microgrids to manage both steady-state and transient conditions. The main goal of this research paper is to investigate how the hybrid energy storage system (HESS) improves the stability of DC microgrids. According to sets of results, the proposed scheme has successfully reduced DC bus voltage variations regardless of variations in solar irradiance and the different pulsed load profiles. © 2023 IEEE.

关键词： Supercapacitor

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In-situ fabrication of on-chip 1T'-MoTe_(2)/Ge Schottky junction photodetector for self-powered broadband infrared imaging and position sensing

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Nano Research 2024年第6期17卷 5587-5594页

作者： Menglei Zhu Kunxuan Liu Di Wu Yunrui Jiang Xue Li Pei Lin Zhifeng Shi Xinjian Li Ran Ding Yalun Tang Xuechao Yu Longhui Zeng School of Physics and Microelectronics and Key Laboratory of Material PhysicsZhengzhou UniversityZhengzhou 450052China Department of Electrical and Computer Engineering University of California San DiegoLa JollaCA 92093USA State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Key Laboratory of Multifunctional Nanomaterials and Smart Systems Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

High-sensitivity room-temperature multi-dimensional infrared(IR)detection is crucial for military and civilian ***,the gapless electronic structures and unique optoelectrical properties have made the two-dimensional(2D)topological semimetals promising candidates for the realization of multifunctional optoelectronic ***,we demonstrated the in-situ construction of high-performance 1T’-MoTe_(2)/Ge Schottky junction device by inserting an ultrathin AlOx passivation *** good detection performance with an ultra-broadband detection wavelength range of up to 10.6 micron,an ultrafast response time of~160 ns,and a large specific detectivity of over 109 Jones in mid-infrared(MIR)range surpasses that of most 2D materials-based IR sensors,approaching the performance of commercial IR *** on-chip integrated device arrays with 64 functional detectors feature high-resolution imaging capability at room *** these outstanding detection features have enabled the demonstration of position-sensitive detection *** demonstrates an exceptional position sensitivity of 14.9 mV/mm,an outstanding nonlinearity of 6.44%,and commendable trajectory tracking and optoelectronic demodulation *** study not only offers a promising route towards room-temperature MIR optoelectronic applications,but also demonstrates a great potential for application in optical sensing systems.

关键词： MoTe_(2) broadband photodetection Schottky junction imaging position sensitive detector

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Analyzing Closed-loop Control Methods in Domino Resonant Inductive Wireless power Transfer System

Analyzing Closed-loop Control Methods in Domino Resonant Ind...

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2023 IEEE International Conference on Environment and electrical engineering and 2023 IEEE Industrial and Commercial power systems Europe, EEEIC / I and CPS Europe 2023

作者： Sarsembayev, Bayandy Heidari Yazdi, Seyed Saeid Shafiei, Sadjad Kermani, Mostafa Saukhimov, Almaz Bagheri, Mehdi Nazarbayev University Dept. of Electrical and Computer Engineering Astana Kazakhstan Sapienza University of Rome Dept. of Electrical Engineering Rome Italy University of Power Engineering and Telecommunications Dept. of Electrical Systems and Networks Almaty Almaty Kazakhstan

ISBN: (纸本)9798350347432

This study analyzes the closed-loop control strategy for the domino resonant inductive power transfer (DR-IPT) system (modulation of DC-link voltage, phase shift, and switching frequency) for wireless battery charging. A high-voltage AC line (HVAC) is supposed to provide the initial AC voltage for the power converter. Three closed-loop control scenarios are used and the performance of the DR-IPT is examined. The frequency and phase shift controls are applied directly to the full-bridge inverter via the PWM technique, and the DC-link voltage control is employed with the buck-boost converter. This study shows that PI controllers are appropriate to achieve the desired system performance to charge a LiPo battery. Also, the simulation results reveal that the charging process can be effectively regulated using controllers;however, among different approaches, the phase shift control method might be considered the most suitable approach for charging the LiPo battery and avoiding bifurcation and increasing the cost of the RD-IPT system. © 2023 IEEE.

关键词： Energy transfer

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A Comprehensive Structural Study and Frequency Control of Inductive power Transfer System

A Comprehensive Structural Study and Frequency Control of In...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Onai, Kuseso Ojo, Olorunfemi Arogunjo, Ezekiel Tennessee Technological University Laboratory for Electric Machine and Power Electronics Department of Electrical and Computer Engineering CookevilleTN38505 United States

ISBN: (纸本)9798350316445

In this paper, a structural study of the inductive power transfer system charging a Li-ion battery is presented. Instead of representing the battery by a constant resistor, an actual model of the battery is included. The inclusion of the battery reveals that the dynamics of the system is dominated by the battery parameters. It is shown that the system is both completely controllable and observable. For frequency control operation of the inductive power transfer system, it is shown that the states associated with the inductive power transfer are the most controllable and observable states whilst those associated with the battery are the least controllable and observable states. Based on these findings, a PID controller is designed to control the charging of the battery in both constant current and constant voltage modes. Simulation and experimental results of the designed controller are presented. © 2023 IEEE.

关键词： battery charging control controllability frequency inductive observability stability

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Radiative cooling for passive thermal management towards sustainable carbon neutrality

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National Science Review 2023年第1期10卷 87-97页

作者： Jun Liang Jiawei Wu Jun Guo Huagen Li Xianjun Zhou Sheng Liang Cheng-Wei Qiu Guangming Tao Wuhan National Laboratory for Optoelectronics and Optics Valley Laboratory Huazhong University of Science and Technology Department of Electrical and Computer Engineering National University of Singapore MOE Key Laboratory of Thermo-Fluid Science and Engineering School of Energy and Power Engineering Xi'an Jiaotong University Key Laboratory of Education Ministry on Luminescence and Optical Information Technology National Physical Experiment Teaching Demonstration CenterDepartment of PhysicsSchool of Physical Science and Engineering Beijing Jiaotong University State Key Laboratory of Material Processing and Die &Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology

Photonic structures at the wavelength scale offer innovative energy solutions for a wide range of applications,from high-efficiency photovoltaics to passive cooling,thus reshaping the global energy *** cooling based on structural and material design presents new opportunities for sustainable carbon neutrality as a zero-energy,ecologically friendly cooling *** this review,in addition to introducing the fundamentals of the basic theory of radiative cooling technology,typical radiative cooling materials alongside their cooling effects over recent years are summarized and the current research status of radiative cooling materials is outlined and ***,technical challenges and potential advancements for radiative cooling are forecast with an outline of future application scenarios and development *** the future,radiative cooling is expected to make a significant contribution to global energy saving and emission reduction.

关键词： photonic structures radiative cooling energy saving and emission reduction carbon neutrality

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Decomposed Modeling of Controllable and Uncontrollable Components in power systems with High Penetration of Renewable Energies

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Journal of Modern power systems and Clean Energy 2022年第5期10卷 1164-1173页

作者： Hai Li Ning Zhang Yue Fan Ling Dong Pengcheng Cai State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China State Grid Qinghai Electric Power Co. Ltd.XiningChina State Grid Xinjiang Electric Power Co. Ltd.UrumqiChina

The high penetration of variable renewable energies requires the flexibility from both the generation and demand sides. This raises the necessity of modeling stochastic and flexible energy resources in power system operation. However,some distributed energy resources have both stochasticity and flexibility, e.g., prosumers with distributed photovoltaics and energy storage, and plug-in electric vehicles with stochastic charging behavior and demand response capability. Such partly controllable participants pose challenges to modeling the aggregate behavior of large numbers of entities in power system operation. This paper proposes a new perspective on the aggregate modeling of such energy resources in power system ***, a unified controllability-uncontrollability-decomposed model for various energy resources is established by modeling the controllable and uncontrollable parts of energy resources separately. Such decomposition enables the straightforward aggregate modeling of massive energy resources with different controllabilities by integrating their controllable components with linking constraints and uncontrollable components with dependent discrete convolution. Furthermore, a two-stage stochastic unit commitment model based on the proposed model for power system operation is established. The proposed model is tested using a three-bus system and real Qinghai provincial power grid of China. The result shows that this model is able to characterize at high accuracy the aggregate behavior of massive energy resources with different levels of controllability so that their flexibility can be fully explored.

关键词： Aggregation dependent discrete convolution flexibility stochastic unit commitment virtual power plant

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Phase Shift Design of Three Phase Transformers for Soft Switching of Three Phase Dual Active Bridge

Phase Shift Design of Three Phase Transformers for Soft Swit...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Mansour, Mohamed Ojo, Joseph Olorunfemi Tennessee Tech University Laboratory of Power Electronics and Electric Machines Department of Electrical and Computer Engineering CookevilleTN38505 United States

ISBN: (纸本)9798350316445

The three-phase dual active bridge plays a pivotal role in the power transfer, owing to its higher-power density with respect to single phase variant. However, it suffers from a low efficiency during operation at light load conditions due to loss of soft device switching. By dividing the phase secondary winding into two, unevenly, the efficiency can be improved by ensuring soft switching at low load conditions with appropriate phase shift angles between the primary and secondary voltages. Thus, this paper provides a detailed mathematical analysis for three phase transformers, which shows the effect of phase secondary windings partitioning on the phase shift angles of induced voltages. © 2023 IEEE.

关键词： Three phase dual active bridge wye-extended delta connection wye-zigzag transformer zero voltage switching

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Decoupled Piecewise Linear power Flow and Its Application to Under Voltage Load Shedding

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CSEE Journal of power and Energy systems 2021年第5期7卷 976-985页

作者： Mang Jiang Qinglai Guo Hongbin Sun Huaichang Ge Department of Electrical Engineering State Key Laboratory of Power Systems.Tsinghua UniversityBeijing 100084.China.

Various optimizations in power systems based on the AC power flow model are inherently mixed-integer nonlinear programming(MINLP)*** linear power flow models can handle nonlinearities and meanwhile ensure a hi^h ***,the MINLP problem can he turned into a tractable mixed-integer linear programming(MILP)***,piecewise linearization also introduces a heavy computational burden because of the incorporation of a large number of binary variables especially for large *** achieve a better trade off between approximation accuracy and computational efficiency,this paper proposes a model called decoupled piecewise linear power flow(DPWLPF)for transmission *** P-Q decoupling characteristic is used to ease the evaluation of the piecewise cosine functions in the power flow ***,in optimizations,the coupling between variables is ***,an under voltage load shedding(UVLS)approach based on DPWLPF is *** studies are conducted for benchmark *** results show that the DPWLPF facilitates the solution of optimal power flow(OPF)and UVLS problems much better than conventional piecewise *** DPWIJM^still enhances the approximation accuracy by usinj»the decoupled piecewise modeling.

关键词： Integer programming piecewise linearization power flow modeling under voltage load shedding

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