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2024 International Conference on Mechatronics and Intelligent Control, ICMIC 2024

作者： Zhang, Shiling He, Yongsheng Dai, Liangjun Wang, Pengbo Deng, Baojia State Grid Chongqing Electric Power Company Electric Power Research Institute Yubei District Chongqing401123 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China

ISBN: (数字)9781510686847

ISBN: (纸本)9781510686830

Compared with simulation technology, the prominent feature of digital twin technology is its complex interaction ability with the external information, which enables the digital twin function of the physical objects through complex interaction. Therefore, a complete digital twin system is formed, and the digital twin model can truly and effectively play its role. To achieve this, it is necessary to establish data interfaces that effectively connect with external information, physical field calculations, the visual displays, etc., to realize the system integration of digital twin models and verify their engineering feasibility. This article analyzes the functional requirements of the system integration, designs its functional framework, constructs functional modules of physical hardware layer, twin model layer, and human-computer interaction layer, and realizes the integration of valve side bushing digital twin model system with data exchange capability, data transmission capability, and coordination between various functional modules. Among generated parameters, E-field strength inside 220kV reduced ratio bushing is controlled within 3kV/mm, and the composite insulator umbrella skirt is installed outside the core. Total length of the bushing is 2465mm, the length of the bushing tail is 810mm, and the length of the hollow composite insulator is 1250mm. © 2025 SPIE.

关键词： Bushings

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Study on the Catalytic Degradation of Strong Greenhouse Gas SF6 Using a Two-Dimensional Metal Organic Framework 5

Study on the Catalytic Degradation of Strong Greenhouse Gas ...

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5th IEEE International Conference on Dielectrics, ICD 2024

作者： Zhu, Kexin Lv, Langlang Chen, Guangzhi Jiang, Hua Wang, Xiangyu Dai, Liangjun Zeng, Fuping School of Electrical Engineering and Automation Wuhan University State Key Laboratory of Power Grid Environmental Protection Wuhan430072 China Chongqing University State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing400044 China

ISBN: (纸本)9798350308976

With the continuous development of sustainable and renewable energy sources, the catalytic degradation of SF6, a strong greenhouse gas, is receiving increasing attention. In this article, we provide a reference for the selection of SF6 thermal catalysts by simulating the adsorption and decomposition processes of SF6 on two-dimensional metals with different metal modifications. Based on DFT (density functional theory), simulate energy changes and charge transfer during adsorption and decomposition processes. The absence of band gaps in the energy band structure of Cu-CN, Mo-CN and Tc-CN implies their metallic character, which can be attributed to the effective orbital interaction between the benzene ring and MN4. In addition, there is a strong chemisorption between the CN structures of Cr, Mn and Ru and SF6 with significant bond length changes, charge transfer. The CN structures of these three metals have better potential to catalyze SF6 © 2024 IEEE.

关键词： Bond length

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A Survivability Assessment Model for the Weak-Link power Grid under Extreme Events

A Survivability Assessment Model for the Weak-Link Power Gri...

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2023 IEEE Sustainable power and Energy Conference, iSPEC 2023

作者： Pan, Ziheng Pan, Congcong Ruan, Gang Hu, Bo Wang, Y. Xie, Kaigui The Power and Energy Reliability Research Center State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China

ISBN: (纸本)9798350322699

This paper proposed a survivability assessment model for the waek-link power grid (WLPG) under extreme events. Firstly, the survivability index system is constructed to reflect the impact of extreme events. It mainly includes secondary index from multiple dimensions and the corresponding tertiary index. Secondly, the objective secondary index information entropy model and primary index principal component analysis model are proposed. Finally, IEEE RTS79 was tested as case study to validate the proposed index assessment model. The proposed model can effectively characterize the survivability of WLPG under extreme events of different severity with a simple calculation process and not require human weighting, making it relatively objective. © 2023 IEEE.

关键词： extreme event index assessment Survivability WLPG

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Strategic Bidding Behavior Analysis with Truthfully Modeled Generator Output Range

Strategic Bidding Behavior Analysis with Truthfully Modeled ...

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2023 IEEE International Conference on Energy Technologies for Future Grids, ETFG 2023

作者： Wang, Yi Yang, Zhifang Yu, Juan Chongqing University State Key Laboratory of Power Transmission Equipment & System Security and New Technology College of Electrical Engineering Chongqing400030 China

ISBN: (纸本)9781665471640

As the foundation of the electricity market, the pricing scheme can affect the bidding behavior of market participants and thus determine the market clearing results. In this paper, we compare and analyze the characteristics of the strategic bidding behavior of generators and corresponding market clearing results with truthfully modeled generator output range under the pay-as-bid pricing scheme and locational marginal pricing scheme. First, we formulate the bi-level strategic bidding problems under two pricing schemes. Second, through the theoretical derivation, we show that the minimum output of the generator has a significant impact on the comparative conclusion between two pricing schemes, which is commonly neglected by existing studies. Then, considering the minimum output of the generator, the quantitative analysis of consumer payment and system operational cost under two pricing schemes is summarized. Finally, the numerical analysis shows some new insights about the comparative conclusion for two pricing schemes. © 2023 IEEE.

关键词： Electricity market locational marginal price market clearing pay-as-bid pricing strategic bidding

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Real-time Junction Temperature Monitoring Method for power Device Based on Two-port Thermal Network

Real-time Junction Temperature Monitoring Method for Power D...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Yu, Yaoyi Du, Xiong Ren, Hongyu Zhou, Junjie Liu, Qiangqiang Li, Jinyang Wang, Zhenye Zhang, Jun Chongqing University State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing China Hohai University Nanjing China

ISBN: (纸本)9798350316445

This paper proposed a novel junction temperature monitoring method for power modules based on two-port thermal network, in which the junction temperature Tja and case temperature Tca are taken as virtual external nodes. The transfer relationship between junction temperature Tja and Tca is firstly investigated in Laplace domain, and then be transferred to the time domain. Theoretical analysis shows that the junction temperature could be expressed by using thermal parameters without requiring power loss information, and its effectiveness is verified by simulation and experiment. This method only needs temperature sensor and gets rid of electrical parameter measurement, which is simple and low cost. Besides, the installation of temperature sensor does not cause intrusive change to the original system, and the measurement process does not affect normal operation of device. Thus the implementation of the proposed method brings negligible hardware burden, and provides more flexibility for noninvasive monitoring. © 2023 IEEE.

关键词： junction temperature power module thermal reliability two-port network

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Noise Shaping technology Based on Multiple Sigma-Delta to Improve SNR of power Amplifier 17th

Noise Shaping Technology Based on Multiple Sigma-Delta to Im...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Zhang, Qi Zhang, Hailin Yao, Jun Qin, Zhentao State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical Engineering Chongqing University Chongqing400000 China

ISBN: (纸本)9789819903566

High switching frequency operation is the decisive factor for power amplifier to achieve high current loop bandwidth. However, the PWM bit at high switching frequency is very low, resulting in a lot of quantization noise in the output current. Therefore, quantization noise shaping technology is applied to reduce output current noise. In this paper, the system model considering PWM bit limit is firstly established, then the zero-pole distribution of quantized noise to output current transfer function under closed-loop control is analyzed, and the noise shaper is designed. The signal to noise ratio of output current is improved by 51.34 dB by the noise shaper. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： power amplifiers

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Lifetime Estimation of HD-GITs based on Drain Leakage Current 10

Lifetime Estimation of HD-GITs based on Drain Leakage Curren...

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10th IEEE International power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Huang, Xu Sun, Pengju He, Zhiyuan Li, Kaiwei Li, Qiang Chen, Lan Chen, Jian Chongqing University State Key Laboratory of Power Transmission Equipment and System Security and New Technology China Guangdong University of Technology School of Integrated Circuits China Southwest Jiaotong University China

ISBN: (纸本)9798350351330

The GaN device is a high-performance alternative to Si devices in the market. However, concerns have been raised regarding their reliability. This paper characterized their reliability by conducting power cycling test (PCT). The test results reveal that the drain leakage current increases as the device degrades. This observation suggests that the drain leakage current could serve as a potential precursor for estimating the device's lifetime. To verify this, device failure is defined as the leakage current exceeding 5 times the initial. Subsequently, the experimental data were analyzed, revealing that the lifetime distribution follows a Weibull distribution. This indicates that the drain leakage current could serve as a precursor for evaluating the lifetime of GaN devices. Furthermore, by utilizing the Arrhenius relationship, the lifetime of GaN devices under various conditions can be estimated. This discovery presents a novel approach for predicting failure and modeling the lifetime of GaN devices. © 2024 IEEE.

关键词： Reliability

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Condition Monitoring of IGBT Module Based on Peak Rise Rate Appearance Time of Case Temperature during the Start-up Process of Converter 4

Condition Monitoring of IGBT Module Based on Peak Rise Rate ...

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4th International Conference on Electrical Engineering and Control Technologies, CEECT 2022

作者： Li, Jinyang Yu, Yaoyi Du, Xiong State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing China

ISBN: (纸本)9781665498999

In this paper, we proposed a new method to monitor the IGBT thermal path degradation of IGBT module using the peak rise rate appearance time of case temperature right below the center of the chip during the start-up process of converter. The correlation between the peak rise rate appearance time and 3rd-order Cauer thermal parameters is analyzed. Results show that the degradation of IGBT module can be monitored by detecting the peak rise rate appearance time. Simulation and experimental tests are performed to verify the effectiveness of the proposed method. © 2022 IEEE.

关键词： Insulated gate bipolar transistors (IGBT)

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Research on Output Torque Optimization of Ultrasonic Motor Based on Genetic Algorithm 17th

Research on Output Torque Optimization of Ultrasonic Motor B...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Li, Xiaoyang Tang, Jiankai Yang, Bo Wu, Hao Xu, Qiwei Yang, Yun The State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400030 China Science and Technology on Reactor System Design Technology Laboratory Chengdu610041 China

ISBN: (纸本)9789819904501

Aiming at the problem of small output torque in the design process of traveling to wave ultrasonic motor, this paper proposes a method of optimizing the output torque of traveling to wave ultrasonic motor based on multi-objective genetic algorithm. It can effectively improve the output torque of the motor. Firstly, the structure and operation mechanism of the motor is introduced, and the key factors affecting the output torque of the motor is analyzed reasonably;then the parameterized model of the stator of the ultrasonic motor is established by WORKBENCH, the sample points are randomly selected in the design variable space, and the combination of each sample point is obtained. The modal analysis and harmonic response analysis of the stator structure was carried out to establish the response surfaces model of the stator;finally, the global optimal solution was obtained based on the response surface model by using the multi-objective genetic algorithm (MOGA). The results show that the output torque of the ultra-sonic motor can be increased by 8% before and after optimization. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Stators

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Experimental and molecular level analysis of natural ester delaying degradation of cellulose insulation polymer

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High Voltage 2022年第5期7卷 1001-1015页

作者： Jian Hao Wenyu Ye Chenyu Gao Mengzhao Zhu Lijun Yang Ruijin Liao State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina State Grid Shandong Electric Power Co. Shandong Electric Power Research InstituteJinanChina

Developing green insulation materials has become an important direction for future *** a new environmental insulation liquid,natural ester can effectively delay cellulose insulation polymer *** the mechanism of natural ester delaying the cellulose ageing could promote its application in power *** this study,based on the accelerated thermal ageing of pressboard immersed in natural ester and 25#mineral oil at 120°C for 221 days,the thermal ageing rate and the levelling off degree of polymerisation(LODP)for two kinds of oil-impregnated pressboards were *** molecular level mechanism of natural ester delaying cellulose degradation and keeping higher LODP value was proposed using molecular dynamics *** the early stage of thermal ageing,cellulose with a higher degree of polymerisation(DP)can form many hydrogen bonds with hydronium ions,and their binding energy is stronger,which can accelerate the acid hydrolysis of cellulose,causing the DP of pressboard immersed in natural ester and mineral oil to decrease *** the breaking of the cellulose molecular chain,the number of hydrogen bonds and binding energy between cellulose and hydronium ions becomes smaller and the thermal ageing rate decreases *** the end stage of ageing,it is difficult for the hydronium ions to enter the crystalline cellulose,acid hydrolysis of crystalline cellulose is hard to conduct,leading to the occurrence of the LODP *** degradation rate of cellulose in natural ester is only 50%of that in mineral *** cellulose LODP value in natural ester is over 200 larger than that in mineral *** with the mineral oil-cellulose system,natural ester can form hydrogen bonds with hydronium ions and lead to fewer hydronium ions in cellulose,fewer hydrogen bonds and smaller binding energy between cellulose and hydronium ions,which can reduce the acid hydrolysis reaction of *** study provides a theoretical explanation for

关键词： insulation delay cellulose

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