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Sustainable Power and Energy Conference (iSPEC)

作者： Zeren Guo Jianhang Zhu Jiabing Hu Guojie Zhao Zefei Wu Buyang Du State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China Department of Electrical and Electronic Engineering The University of Hong Kong Hong Kong China

ISBN: (数字)9798350395075

ISBN: (纸本)9798350395082

The requirement for negative sequence control introduces time-varying coupling between the positive and negative sequences in a doubly fed induction generator (DFIG). The potential risk of electromagnetic oscillation in DFIG-based wind turbine (WT)-dominated power systems (DFIG-WTPS) necessitates small-signal modeling and stability analysis considering time-varying characteristics. However, the traditional linear time-invariant (LTI) modeling method based on Park transformation is no longer suitable. Therefore, this paper applies the linear time-periodic (LTP) modeling method based on trajectory linearization to the small-signal modeling of DFIG- WTPS in electromagnetic timescale. Floquet theory is further introduced to calculate the L TP eigenvalues. Then, the influence of series capacitor and control parameters on small-signal stability is analyzed. Finally, the results from the nonlinear DFIG- WTPS model demonstrate the effectiveness of the proposed analysis.

关键词： Current control Analytical models Stability criteria Power system dynamics Power system stability Eigenvalues and eigenfunctions electromagnetics Phase locked loops Time-varying systems Oscillators

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Inertia Evaluation and Optimal Design for PMSG-Based Wind Turbines with df/dt Control

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IEEE Journal of Emerging and Selected Topics in Power Electronics 2024年

作者： Hu, Bo Zhu, Donghai Hu, Jiabing Liu, Ruikuo Zou, Xudong Kang, Yong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China China Three Gorges Corporation Science and Technology Research Institute Beijing100038 China

The df/dt control is widely used for permanent magnet synchronous generator (PMSG)-based wind turbines (WTs) to achieve inertial response. However, existing studies have only used df/dt control coefficients to characterize the inertia of WTs, which leads to inaccurate inertia evaluation and unsatisfactory design of control parameters. To deal with it, this paper presents an inertia evaluation and optimal design of PMSG-based WTs, by considering the multi-loop control dynamics. Firstly, the magnitude-phase motion model is established and the equivalent inertia in the form of a transfer function is derived. Then, the influence of multi-loop controllers and wind speed on equivalent inertia are explored, and the critical factors are revealed. Further, considering the inertia support requirements and the stable operation of the WTs, the inertia control parameters are optimally designed. Finally, the analysis and design are validated by experiments. © 2013 IEEE.

关键词： Permanent magnets

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Research on Direct Carbon Emissions of Bisphenol a Epoxy Resin in Substation Equipment 18th

Research on Direct Carbon Emissions of Bisphenol a Epoxy Res...

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Ke, Hu He, Jiahui Zhang, Dandan Hou, Guobin China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan430074 China State Grid Corporation of High Voltage Electrical Equipment Field Test and Evaluation Laboratory State Grid Hubei Electric Power Co. Ltd. Electric Power Research Institute Wuhan430077 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Pulsed Power Technology Huazhong University of Science and Technology Ministry of Education Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819713509

The qualitative and quantitative analysis of direct carbon emissions during the operation of substation equipment is an important part of the power system to achieve the goal of "double carbon". A large amount of pouring epoxy resin in dry-type equipment is heated and aged during equipment operation, but the current research lacks a special study on the greenhouse gas emissions and emission levels in this process, which is not conducive to the formulation of emission reduction measures. In this paper, based on the direct carbon emission characteristics of epoxy resin, accelerated thermo-oxidative aging experiments of epoxy resin at different temperatures and times were designed, and the greenhouse gas products were detected and analyzed by gas chromatography. Based on the lifetime of the epoxy resin and its relationship to the aging temperature, direct carbon emissions are calculated during the different aging processes of the epoxy resin. This paper points out that each unit mass loss in the aging process of unit epoxy resin leads to 6.11 units of direct carbon emissions, and a total of 0.208 units of direct carbon emissions are caused in its life cycle. Data support. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Epoxy resins

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Robust Local PMU Measurement Recovery Based on Singular Spectrum Analysis of Hankel Structures

Robust Local PMU Measurement Recovery Based on Singular Spec...

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2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Pei, Jianhua Wu, Zhipeng Wang, Jingyu Shi, Dongyuan 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)9781665414395

The development of cyber-physical power systems gives rise to the concerns on the data quality issue of phasor measurement units (PMUs). Low signal-to-noise ratios (SNRs) and data missing caused by malicious electromagnetic interference, false data injections, and equipment malfunctioning may jeopardize the integrity and availability of power system monitoring, protection, and control applications. To ensure grid resiliency, this paper proposes a PMU measurement recovery method based on the singular spectrum analysis of Hankel structures. It utilizes single or multiple channels of PMU time-series to restore the problematic phasor measurements with low SNRs and data losses. Numerical case studies demonstrate that the proposed method can recover the noise-contaminated measurements with higher accuracy than traditional methods such as filtering and wavelet analysis, and can effectively complete the missed data. The latency margins of power system applications can be satisfied in the mean time. © 2021 IEEE.

关键词： Phasor measurement units

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Critical current density and AC magnetic susceptibility of high-quality FeTe_(0.5)Se_(0.5)superconducting tapes

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Superconductivity 2024年第4期12卷 1-8页

作者： Xin Zhou Wenjie Li Qiang Hou Wei Wei Wenhui Liu Ke Wang Xiangzhuo Xing Linfei Liu Jun-Yi Ge Yanpeng Qi Huajun Liu Li Ren Tsuyoshi Tamegai Yue Sun Zhixiang Shi School of Physics Southeast UniversityNanjing 211189China Department of Applied Physics The University of TokyoTokyo 113-8656Japan School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Materials Genome Institute Shanghai UniversityShanghai 200444China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Institute of Plasma Physics Chinese Academy of SciencesHefeiAnhui 230031China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430030China

Iron telluride‐selenium superconducting materials,known for their non‐toxicity,ease of preparation,simple structure,and high upper critical fields,have attracted much research interest in practical *** this work,we conducted electrical transport measurements,magneto‐optical imaging,and AC magnetic susceptibil-ity measurements on FeTe_(0.5)Se_(0.5)superconducting long tapes fabricated via reel‐to‐reel pulsed laser *** transport measurements revealed a high critical current density that remains relatively stable even with increasing external magnetic fields,reaching over 1×10^(5)A/cm^(2)at 8 K and 9 *** calculated pinning force density indicates that normal point pinning is the primary mechanism in these *** magneto‐optical images demonstrated that the tapes show homogeneous superconductivity and uniform distribution of critical current *** AC magnetic susceptibility measurements also confirmed their strong flux pinning nature of withstanding high magnetic *** on these characteristics,FeTe_(0.5)Se_(0.5)superconducting tapes show promising prospects for applications under high magnetic field.

关键词： FeSe_(0.5)Te_(0.5) Coated conductor Flux pinning AC magnetic susceptibility Magneto‐optical imaging

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Additives to propylene carbonate-based electrolytes for lithium-ion capacitors

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Rare Metals 2022年第4期41卷 1304-1313页

作者： Peng-Lei Wang Xian-Zhong Sun Ya-Bin An Xiong Zhang Chang-Zhou Yuan Shuang-Hao Zheng Kai Wang Yan-Wei Ma Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu ZhongkeJinan 250013China School of Materials Science&Engineering University of JinanJinan 250022China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China

Nowadays,lithium-ion capacitors(LICs) have become a type of important electrochemical energy storage devices due to their high power and long cycle life characteristics with fast response *** one of the essential components of LICs,the electrolytes not only provide the anions and cations required during charge and discharge processes,but also supply the liquid environment for ions to migrate between anodes and cathodes in LIC *** is well accepted that propylene carbonate(PC) cannot be used as a single solvent for Li-ion electrolyte due to the failure to form stable SEI film on graphite *** this work,the compatibility of PC-based electrolyte with commercial soft carbon anode and activated carbon cathode has been validated by using the laminated pouch LIC *** effects of additives on the electrochemical properties of PC-based LICs have been systematically *** sulfite(ES) was proved to be an effective additive to promote capacity retention at high C-rate,which is superior to vinylene carbonate and fluoroethylene *** addition of 5 wt% ES plays an important role in reducing internal resistance,as well as improving electrochemical stability and low-temperature *** study is expected to be beneficial to explore robust electrolyte/additive combinations for LICs to reduce the internal resistance and to improve the lowtemperature performances.

关键词： Lithium-ion capacitors Propylene carbonate Li-ion electrolyte Ethylene sulfite Fluoroethylene carbonate Lithium bis(fluorosulfonyl)imide

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Distributed Optimization for Evs Integrated Power System Considering Flexible Ramping Requirement

SSRN

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SSRN 2024年

作者： Chen, Wenzhe Sun, Haishun Peng, Chaoyi Zhou, Huafeng Xu, Suyue State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China China Southern Power Grid Dispatching & Control Center Guangzhou China

More flexible ramping service is required due to the increase of renewable power generation in power systems. Electric vehicles (EVs) could provide such flexible ramping products (FRPs) at low cost while participating in the electricity market through aggregation. However, EVs’ dispatching capability cannot be fully utilized without the right incentives. This paper addresses a distributed optimal model developed between EV aggregators (EVAs) and the independent system operator (ISO). To make such concept, a cloud-edge collaborated market structure is adopted. At the edge level, EVAs assess the dispatching capability and solve the market bidding subproblem. At the cloud level, ISO solves the market clearing subproblem considering system’ economy and security. The overall problem is solved by the analytical target cascading (ATC) method. Heuristic constraints are also introduced into the model to improve convergence performance. The model is tested on a modified IEEE 30-bus system. Results demonstrate that the proposed method can incentivize EVAs with different owners to shift load and provide FRPs accurately, meanwhile reducing the cost and increasing the consumption of renewable energy effectively. © 2024, The Authors. All rights reserved.

关键词： Optimization

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Characteristics Evaluation of SiC MOSFET in DC Circuit Breaker

Characteristics Evaluation of SiC MOSFET in DC Circuit Break...

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Energy Storage and Conversion (ISESC), CPSS & IEEE International Symposium on

作者： Zhongqi Guo Lin Liang Xiangyu Wan Zhengheng Qing Ziyang Zhang Xiaoxue Yan State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Engineering Research Center of Power Safety and Efficiency Ministry of Education of China Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350380514

ISBN: (纸本)9798350380521

In order to evaluate the characteristics of SiC MOSFET under the mission profile of DC Circuit Breaker (DCCB), a complete DCCB test platform considering the RCD transfer loop and the MOV absorption loop is set up. Based on this platform, single and repetitive short-circuit interrupting experiments are carried out. Through these tests, the characteristics evaluation of 1200V/66A SiC MOSFET under DCCB is tested and analyzed. The aging test results are given. DCCB has its unique mission profile (interruption of large short-circuit current, fast current transfer, etc.), and the characteristics evaluation of SiC MOSFET in DCCB is necessary. For the single tests, the maximum interrupted current is 2.02 times the rated current. For the repetitive tests, the number of interruptions exceeds 2000 times and the interruption boundary is 2004 times under 1.85 times rated current. The failure causes of the devices in two cases are drain thermal failure and gate-source short circuit respectively. After 2000 experiments, the interruption time of DCCB increased significantly, and the $I_{\text{dss}}, V_{\text{gs}(\text{th})}$ , and $R_{\text{ds}(\text{on})}$ of the device increased by about 53.36%, 4.29%, and 16.94% respectively.

关键词： Heating systems MOSFET Silicon carbide Absorption Circuit breakers Short-circuit currents Logic gates Aging MOSFET circuits Fault currents

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Modulation Strategy for Cascaded DC/DC Converter through Integration of CLLLC and Six-Switch Buck-Boost Topology

Modulation Strategy for Cascaded DC/DC Converter through Int...

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PELS Students and Young Professionals Symposium (SYPS), IEEE

作者： Erya Qu Yu Zhang Meng He Yangfan Chen State Key Laboratory of Advanced Electromagnetic China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology WuHan China State Key Laboratory of Advanced Electromagnetic School of Electrical and Electronic Engineering Huazhong University of Science and Technology WuHan China

This paper proposes a cascaded DC/DC converter which integrates the six-switch Buck-Boost circuit with CLLLC converter by sharing a bridge arm and shows advantages of bidirectional energy flow, high voltage rating, high efficiency and wide input voltage range. First, an alternative PWM strategy (APWM) for the six-switch Buck-Boost circuit is proposed to balance its flying capacitor voltage. Next, a control method for both current ripple optimization and power control (CRO-PC) is proposed which can reduce 73.5% of current ripple. Finally, a 2 kW/ 20 kHz prototype was built to demonstrate the performance of the proposed method.

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Antioxidant migration on dielectric properties of long-term impregnated insulating oil

Antioxidant migration on dielectric properties of long-term ...

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23rd International Symposium on High Voltage engineering (ISH 2023)

作者： Yucheng Wang Hua Li Ziqin Huang Fuchang Lin State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science & Technology Wuhan People's Republic of China

ISBN: (数字)9781839539923

High voltage capacitors are widely used in electrical power systems. For better capability in applications, capacitors are impregnated with insulating oil. Polypropylene in its natural state is inherently unstable and degrades when exposed to oxygen. To avoid oxidation that occurs in the process of film forming, antioxidants are developed and used. In this paper, the polypropylene casts added respectively with antioxidant 1010, 3114, 330 and BHT were long-term impregnated in benzyl toluene oil. Secondly, the frequency domain dielectric spectroscopy method was used to study the dielectric properties of the oil. In addition, the effect of antioxidants on the polarization relaxation process of insulating oil was analyzed. The results indicate that antioxidants and small molecular polypropylene in the amorphous region of the film migrate to the oil during long-term impregnation, resulting in increases in relative dielectric constant ɛ r , dielectric loss tan δ and dc conductivity σ dc , and affect the polarization relaxation process. Among these antioxidants, antioxidant 1010 has the greatest impact on insulating oil, while antioxidant 330 has the least impact.

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