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In-situ Monitoring of Maximum and Average Chip Junction Temperature within Multichip IGBT power Modules Using Kelvin Emitter Voltage

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IEEE Journal of Emerging and Selected Topics in power Electronics 2025年

作者： Yang, Jianxiong Ran, Li Che, Yanbo Du, Mingxing Tianjin University of Technology Tianjin Key Laboratory of Control Theory and Applications in Complicated System Tianjin300384 China Chongqing University State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical Engineering Chongqing400044 China University of Warwick School of Engineering CoventryCV4 7AL United Kingdom Tianjin University Key Laboratory of Smart Grid of Ministry of Education School of Electrical and Information Engineering Tianjin300072 China

Parallel configurations of power chips within a multichip IGBT power module (M-IGBT-PM) are employed to meet the required current and power ratings. When the internal chips of an M-IGBT-PM experience uneven temperature distributions and package aging, it becomes challenging to determine the maximum and average temperatures of the chips within the module. This paper investigates the relationship between four transient thermal-sensitive electrical parameters (T-TSEPs) derived from the Kelvin emitter voltage and the chip junction temperature, while establishing relevant mathematical models. It compares the sensitivity and linearity of these four T-TSEPs, and also assesses the influence of external gate resistance, bus voltage, and load current on each of them. A key innovation in this paper is the proposal of a method for monitoring the maximum and average temperatures across the chips within the M-IGBT-PM, which is not influenced by the load current. The experimental results suggest that the temperature derived from the quasi-turn-on delay time is a good approximation of the maximum chip temperature, whereas the temperatures predicted by the other T-TSEPs are nearer to the average temperature. © 2025 IEEE.

关键词： Insulated gate bipolar transistors (IGBT)

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Analysis of Short-circuit Characteristics and Calculation of Steady-state Short-circuit Current for DFIG Wind Turbine

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电力系统自动化 2012年第8期36卷 115-121页

作者： Xiong, Xiaofu Ouyang, Jinxin State Key Laboratory of Power Transmission Equipment and System Security Chongqing University Chongqing 400030 China

Large-scale doubly-fed induction generator(DFIG)wind turbines are connected to the grid and required to remain grid-connection during faults,the short-circuit current contributed by the generation has become a significant ***,the traditional calculation methods aiming at synchronous generators cannot be directly applied to the DFIG wind turbines.A new method is needed to calculate the short-circuit current required by the planning,protection and control of the power *** short-circuit transition of DFIG under symmetrical and asymmetric short-circuit conditions are mathematically deduced,and the short-circuit characteristics of DFIG are analyzed.A new method is proposed to calculate the steady-state short-circuit current of DFIG based on the derived *** time-domain simulations are conducted to verify the accuracy of the proposed method.

关键词：双馈风力发电机短路电流短路特性计算变速恒频稳态双馈感应发电机非对称短路

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Reliability Evaluation of Wind power Converter Under Fault-tolerant Control Scheme with Quantification of Temperature and Humidity Effects

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Journal of Modern power systems and Clean Energy 2023年第5期11卷 1700-1710页

作者： Xueying Yu Bo Hu Kaigui Xie Changzheng Shao Yunjie Bai Wenyuan Li Jinfeng Ding State Key Laboratory of Power Transmission Equipment and System Security Chongqing UniversityChongqing 400030China

Wind power converter(WPC)is a key part of a wind power unit which delivers electric energy to power *** of a large number of semiconductors,WPC has a high failure *** paper proposes a method to accurately evaluate the reliability of WPC,which is crucial for the design and maintenance of wind ***,the index of effective temperature(ET)is presented to quantify the effects of temperature and humidity on the semiconductor operation.A novel method is proposed to evaluate the lifetime and calculate the aging failure rates of the semiconductors considering the fluctuations of ***,the failure mode and effect analysis(FMEA)of WPC is investigated based on the topology and control *** conventional two-state reliability model of the WPC is extended to the multi-state reliability model where the partial working state under the fault-tolerant control scheme is ***,a reliability evaluation framework is established to calculate the parameters of the WPC reliability model considering the variable failure rates and repair activities of *** studies are designed to verfify the proposed method using a practical wind turbine.

关键词： Effective temperature(ET) fault-tolerant control scheme humidity reliability evaluation wind power converter(WPC)

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An ultrasound imaging algorithm for enhancing the imaging quality of piezoelectric transducer array ultrasound imaging systems

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Sensors and Actuators A: Physical 2025年 392卷

作者： Peng Wang Kunlin Wang Qianwen Li Lin Tong Yue Shen Sirui Chen Jue Wang Ping Wang State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing 400044 China

Ultrasonic imaging, as a fundamental methodology in nondestructive testing, achieves defect characterization through acoustic interaction mechanisms including reflection at impedance boundaries, microstructural scattering, and frequency-dependent attenuation. However, conventional delay-and-sum (DAS) beamforming compromises spatial resolution and contrast performance due to inherent limitations such as main lobe broadening, sidelobe leakage artifacts, and coherent noise interference. The spatial spectrum coherence factor (SSCF) algorithm proposed in this paper is based on the difference in the energy distribution of the spatial spectrum of the echo data after the Fourier transform, and enhances the differentiation between the defects and the background region by the product of the low-frequency component and the total energy; the coherence energy factor (CEF) algorithm proposed in this paper combines the 2-norm energy characterization of the echo signal with the symbolic coherence weighting to suppress the background clutter and reserve the details of the defects. Then the SSCF methodand CEF method are fused to obtain the SSCF-CEF beamforming algorithm, which achieves a more significant enhancement of the imaging effect. The experiment utilizes 20# carbon steel test block, aluminum test block and actual rail test block to verify the effectiveness of the algorithm. The results show that: compared with DAS, the SSCF-CEF algorithm improves the contrast ratio (CR) by 438.26 % and reduces the array performance index (API) by 47.14 % in 20# steel specimen; the half-peak full-width value is optimized to 1.78 mm in the aluminum specimen experiment, which is 53.9 % lower than that of DAS, and compressed API by 90.21 % compared with DAS and achieved a jump of CR by 172.39 %; the CR in the rail inspection scenario is improved by 287.16 %, while the API is reduced by 91.81 %. In addition, SSCF and CEF alone are significantly better than traditional generalized coherence factor

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Fast electrothermal coupling calculation method for supporting digital twin construction of electrical equipment

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High Voltage 2023年第2期8卷 390-400页

作者： Xiaosong Zhu Youyuan Wang Ruixiao Meng Shi Long Shaowen Wu State Key Laboratory of Power Transmission Equipment and System Security and New Technology(Chongqing University) ChongqingChina

The failure of electrical equipment directly or indirectly caused by overheating has become one of the main reasons for equipment *** real-time condition monitoring method of electrical equipment based on digital twin(DT)has received extensive attention and is considered as a technology with great engineering values and excellent application ***,the current calculation of DT mostly relies on the traditional finite element method(CFEM).This method becomes less computationally efficient as the size of the DT increases,especially for electrical equipment with high *** is difficult to meet the requirements real-time calculation in ***,starting from the algorithm optimization and parallel architecture,based on the weighted residual method and stabilised conforming nodal integration,a novel discrete method of electrothermal coupling equation is proposed and the data storage structure of the algorithm from the bottom layer is redesigned,and the corresponding GPU and multi-core CPU parallel framework are ***,taking the high voltage bushing as an example,the correctness of the method in this paper is verified by the CFEM code and commercial software *** the same grid and accuracy requirement,the calculation time is shortened by at least five times than *** the method is easy to extend to other types of multi-physics calculations.

关键词： electrical coupling method

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Bidirectional generative diffusion model with cascaded symmetric attention for brain connectivity-to-connectivity translation

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Biomedical Signal Processing and Control 2025年 108卷

作者： Zuo, Qiankun Di, Yi Ye, Conghuan Shi, Binghua Chen, Junyi Wei, Hui Li, Ruiheng Lei, Bangjun Hubei Key Laboratory of Digital Finance Innovation Hubei University of Economics Hubei Wuhan430205 China School of Information Engineering Hubei University of Economics Hubei Wuhan430205 China The State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing400044 China Hubei Internet Finance Information Engineering Technology Research Center Hubei University of Economics Hubei Wuhan430205 China

Understanding the complex relationship between structural and functional connectivity is fundamental to discovering the pathogenesis of brain diseases. However, it is challenging to establish nonlinear connective relationships between structural and functional modalities. In this study, a novel bidirectional generative diffusion model (BGDM) is proposed to construct bidirectional mapping for connectivity-to-connectivity translation. The proposed BGDM is an AIGC framework to learn bidirectional translation between structural and functional connectivity. By designing the cascaded symmetric attention module, the BGDM can learn multi-channel and cascaded edge features to estimate diffusion noise, which improves computational efficiency and enhances the model's ability to predict brain connectivity patterns. Furthermore, the connectivity noise-balanced loss is devised to adaptively adjust the importance of individual noisy connections and ensure more accurate and reliable translations between diverse brain connectivity representations. We demonstrate the effectiveness of BGDM through comprehensive experiments on the HCP datasets. Our model achieves the best translation performance with the mean MAE/SSIM of 0.065/0.835 for SC-to-FC translation, and the mean MAE/SSIM of 0.050/0.932 for FC-to-SC translation. Compared with the state-of-the-art method, the results of our model show improvements of 0.014 (MAE) and 0.06 (SSIM) for the SC-to-FC task, 0.014 (MAE) and 0.04 (SSIM) for FC-to-SC task. Our model can generate incomplete multimodal brain networks, which can be used to improve the accuracy of brain disease diagnosis and provide clinicians with disease-related biomarkers. Moreover, the proposed model has the potential to bridge the gap between structural connectivity and functional connectivity, offering new opportunities for understanding the brain's working mechanisms and revealing brain disease's pathogenesis. © 2025 Elsevier Ltd

关键词： Mapping

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Multiple Failure Modes of Compressor Station Incorporated into Risk Evaluation of Electricity-gas Integrated Energy systems

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CSEE Journal of power and Energy systems 2023年第4期9卷 1439-1448页

作者： Yi Tang Yuan Zhao Wenyuan Li Kaigui Xie Juan Yu the State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing UniversityChongqing 400044 China

Multiple failure modes of gas compressor stations have not been modeled into risk evaluation of electricity-gas integrated energy system(EGIES).This paper presents a method to incorporate multiple failure modes of compressor stations with bypass systems in the EGIES risk *** outage models representing multi-states and multi-failure-modes of com-pressor stations and a bi-level Monte Carlo sampling algorithm for the models are developed.A novel network model of EGIES considering compressor stations with multiple failure modes is *** EGIES with a modified RBTS and an 11-node gas system is used to demonstrate the effectiveness of the proposed method and *** indicate that compressor stations have both positive and negative significant impacts on the risk of *** systems for compressor stations can effectively offset the negative *** compressor stations and their station failures in the risk evaluation of EGIES may result in an inaccurate estimation of the system risk levels and even lead to a misleading conclusion in system *** Terms-Compressor station,electricity-gas integrated energy system,multiple failure modes,risk evaluation.

关键词： Compressor station electricity-gas integrated energy system multiple failure modes risk evaluation.

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Per-unit Scheme for Integrated Solution of Hybrid power-water Flow Problem

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Journal of Modern power systems and Clean Energy 2023年第2期11卷 680-685页

作者： Xia Zhao Hong Tan Luo Wang Mingyi Sun State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina

When applying the widely-used Newton-Raphson(N-R)method to the integrated solution of the hybrid power-water flow problem of the power-water integrated energy system(PW-IES),it is found that there are numerical differences among Jacobian elements,which may yield an ill-conditioned Jacobian matrix and even cause convergence ***,this letter proposes to per-unitize the water distribution network(WDN)to reduce the numerical differences and thus to improve the Jacobian matrix conditioning and the integrated N-R solution to the hybrid power-water flow problem.

关键词： Integrated energy system load flow Newton-Raphson method water distribution network power-water flow

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Harmonic Damping Characteristics of Single-phase Full-bridge Rectifier Based Loads

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CSEE Journal of power and Energy systems 2022年第5期8卷 1448-1456页

作者： Yihang Zhang Jiaming Lu Jing Yong State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina

With the rapid development of power electronic technology,many linear single-phase loads in low voltage systems are replaced by those equipped with a single-phase diode ***,most of single-phase loads become harmonic producers due to their nonlinear *** nonlinear loads may have different damping characteristics at harmonic frequencies,which could cause potential power quality *** paper studies the harmonic damping characteristics of such nonlinear *** harmonic damping index is defined to quantify the damping effect of nonlinear loads of harmonic frequencies by analyzing the harmonic ***,the harmonic damping index of different harmonic frequencies is compared through simulations and *** results show that the nonlinear load has a constant damping effect for the fundamental frequency,but a stronger damping for the harmonic *** harmonic damping of such nonlinear loads varies with the harmonic phase angle of supply voltage,and becomes stronger with the increase of the harmonic *** implies that this type of nonlinear load may be beneficial to the suppression of harmonic resonance.

关键词： Damping effect harmonic domain model harmonic impedance nonlinear load

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Self-Stable Chaos Control of dc-dc Converter

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中国物理快报（英文版） 2009年第3期26卷 40-43页

作者： LU Wei-Guo ZHOU Luo-Wei WU Jun-Ke State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing UniversityChongqing 400044

A new concept related to self-stable chaos control is first put forward,and its theoretical basis and realization are presented from the frequency-domain perspective. With a new analogous-circuit realization of this control its applications in the voltage-mode Buck converter is discussed. The harmonic-balance method is applied to determine the control range of the control *** experiment results given in the last part confirm the validity of the proposed control method.

关键词： No English keywords

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