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Study on Condition Monitoring Method Based on Magnetic Flux Density for Multi-Chips Parallel IGBT Modules

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 2024年第4期60卷 6499-6511页

作者： Lai, Wei Xing, Zhen Yao, Ran Ding, Xueni Shi, Jing Min, Yuan Li, Hui Yang, Cheng Han, Wenxing Yuan, Yannan Chongqing Univ Sch Elect Engn State Key Lab Power Transmiss Equipment Technol Chongqing 400044 Peoples R China Suzhou Power Supply Co State Grid Jiangsu Elect Power Co Ltd Suzhou 215000 Peoples R China Shaoxing Power Supply Co State Grid Zhejiang Elect Power Co Ltd Shaoxing 312000 Peoples R China Key Lab Nucl Reactor Syst Design Technol Chengdu 610213 Peoples R China

IGBT modules are widely used in various fields of power electronics, and their reliability is important for power systems. Multi-chips parallel IGBT modules face more challenges in condition monitoring and health assessment due to their complex spatial structure, uneven current distribution, and uneven temperature distribution, resulting in uneven aging. Focusing on this problem, based on the multi-physics field finite element simulation technology, the degradation law of the electrothermal and magnetic characteristic parameters during the aging failure process of the multi-chips parallel IGBT module is studied, and the magnetic flux density is used as the aging status monitoring parameter. A health status evaluation model is established for the bonding wire lift-off and solder layer aging failure modes, which is used to realize multi-chips parallel IGBT module failure type identification and quantitatively evaluate for the health status and aging chip positioning. Then, the accuracy of the health assessment model is verified by experiments, and the condition monitoring method does not require changing or touching the internal circuits of the modules. Finally, an aging failure mode based on the change of the sum of the magnetic flux density is proposed to realize the judgment of the aging failure mode and the quantitative evaluation of the health status.

关键词： Insulated gate bipolar transistors Aging Wires Bonding Magnetic flux density Resistance Voltage measurement Bonding wire lift-off condition monitoring magnetic flux density multi-chips parallel IGBT (insulated gate bipolar transistor) solder fatigue

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Subsynchronous oscillation suppression strategy of wind turbine's phase-locked loop based on optimal damping ratio

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ENERGY REPORTS 2024年 11卷 3088-3095页

作者： Guo, Hao Wang, Chang Yang, Lin Xia, Mamman Liu, Zhuolin Zhang, Xiangyu State Grid Jibei Elect Power Econ Res Inst Beijing 100038 Peoples R China Beijing Jingyan Elect Power Engn Design Co Beijing 100038 Peoples R China North China Elect Power Univ State Key Lab Alternate Elect Power Syst Renewable Baoding 071003 Peoples R China

The dynamic characteristics of the phase-locked loop (PLL) of the wind turbine are the key to the synchronous operation of these renewable energy sources with the power grid. In this paper, the coupled dynamic model of PLL of the permanent magnet synchronous generator (PMSG)-base wind turbine and power grid is established firstly. The complex torque method is used to calculate the synchronous and damping torque coefficients in the PLL oscillation mode. Secondly, the influence of the PLL parameter, voltage at the point of common coupling (PCC), wind turbine's output power and electrical distance on the oscillation damping behavior of the PLL is analyzed. Further, a novel control strategy based on optimal damping ratio is proposed to suppress the subsynchronous oscillation of the system caused by wind turbine's PLL in weak interconnected grids. Finally, a simulation model of regional power network with high penetration of wind power generation is built to demonstrate the effectiveness of the proposed control scheme in suppressing the system's subsynchronous oscillation caused by the wind turbine's PLL.

关键词： Subsynchronous oscillation Damping Phase-locked loop Complex torque method

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Wind/storage coordinated control strategy based on system frequency regulation demands

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ENERGY REPORTS 2024年 11卷 1551-1559页

作者： Jiang, Yu Wang, Chang Xiao, Lin Yu, Di Zhang, Xiangyu State Grid Jibei Elect Power Econ Res Inst Beijing 100038 Peoples R China Beijing Jingyan Elect Power Engn Design Co Beijing 100038 Peoples R China North China Elect Power Univ State Key Lab Alternate Elect Power Syst Renewable Baoding 071003 Peoples R China

In the power systems with high proportion of renewable power generation, wind turbines and energy storage devices can use their stored energy to provide inertia response and participate in primary frequency regulation for the improved system frequency stability. In this paper, the security constraint conditions in the system's frequency response process are analyzed firstly, and then the system frequency regulation demand is evaluated. According to the system frequency regulation demand and the grid codes, an energy storage capacity configuration scheme is then proposed. To further explore the frequency regulation potential of renewable power generation, the coordinated control strategy adapted to wind power and energy storage is proposed, in which the controller parameters is adjusted according to the system frequency regulation demand. Finally, a high proportion wind power system is built in simulation platform to verify the effectiveness of the proposed strategy. The results demonstrate that under the proposed strategy, the wind turbines and energy storage devices can provide more reliable power response together, thus improving the total capability for the grid frequency support.

关键词： Wind turbine Frequency response Energy storage configuration Frequency regulation demand Coordinated control

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A Modeling Method and Characteristics Study of EMI in 12-Phase Rectifier Circuit With Actual Switching Process Based on State Transition

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IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY 2024年第3期66卷 1001-1014页

作者： Xu, YinXiang Liu, Qi-Feng Mou, Bailin Huang, Chen Peng, Wenxiong Zhu, Xuegui Zhang, Huai-Qing Chongqing Univ Sch Elect Engn State Key Lab Power Transmiss Equipment Technol Chongqing 400044 Peoples R China State Grid Huzhou Municipal Elect Power Co Huzhou 313000 Peoples R China China Ship Dev & Design Ctr Sci & Technol EMC Lab Wuhan 430064 Peoples R China

The 12-phase rectifier circuit has been widely used in ships, subways, and other systems due to its advantages of high voltage level and high power capacity. As the voltage and current levels, the power capacity increases, leading to higher levels of ${{dv}/ {dt}}$ and ${{di} / {dt}}$, and electromagnetic interference (EMI) becoming increasingly significant. Therefore, it is pivotal to study the mechanism of conducted EMI in the 12-phase rectifier circuit to establish the foundation for the targeted EMI suppression. At present, there is scarce literature on the generation mechanism of conducted EMI in the rectifier circuit with more than three phases. In addition, there is no existing prediction method for conducted EMI in a 12-phase rectifier circuit combined with the actual switching waveform. Therefore, this article proposes a conducted EMI modeling method for arbitrary 12-phase rectifier circuits with the actual switching waveform based on state transition. This method can not only give the theoretical calculation model of differential mode (DM) and common mode (CM) conducted EMI but also achieve the quantitative prediction of DM and CM conducted EMI combined with the actual switching process. A 12-phase rectifier module is taken as an example to validate the proposed method through circuit simulation and experiment. Furthermore, the influence of unbalanced impedance and the unbalanced power supply on the EMI of the 12-phase rectifier circuit is analyzed. Unbalanced impedance will result in more high-frequency harmonics for the DM, and the unbalanced power supply voltage will result in more high-frequency harmonics for both the DM and CM.

关键词： Electromagnetic interference Integrated circuit modeling Time-domain analysis Voltage power supplies Predictive models Switching circuits 12-phase rectifier circuit conducted electromagnetic interference (EMI) theoretical modeling unbalanced parameter

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Analytical Method for Predicting Tunnel Deformation Caused by Overlying Excavation Considering the Dewatering

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INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS 2025年第3期49卷 860-876页

作者： Li, Yanwei Wang, Defa Luo, Yiping Liu, Yuhao Suo, Nan Liu, Zhao Wang, Qi Xian Univ Technol Sch Civil Engn & Architecture Xian Peoples R China Xian Univ Technol State Key Lab Ecohydraul Northwest Arid Reg China Xian Peoples R China State Grid Shaanxi Elect Power Co Ltd Gen Management Dept Construct Branch Xian Peoples R China Gansu Diantong Elect Power Engn Design Consulting Power Grid Div Lanzhou Peoples R China

Predicting the tunnel deformation caused by overlying excavation is a crucial catch in current rail transit construction. Most theoretical studies overlook the effect of dewatering on tunnel response. This study utilized Mindlin's stress solution and an improved incremental method to calculate the additional load resulting from excavation. The load increment due to dewatering was determined based on the effective stress principle and a modified Dupuit infiltration curve. Treating the tunnel as a series of segment rings on a Vlazov foundation, the energy variance method and a collaborative deformation model were employed to develop a tunnel deformation prediction model. The proposed model's validity was confirmed by examining two traceable cases. Based on this, further discussion addressed the impact of dewatering depth, tunnel burial depth, tunnel-pit relative distance, and intersection angle on existing tunnel deformation. Finally, combining the proposed model with multiple regression analysis, a semi-empirical method was established to determine the tunnel's maximum vertical displacement. The study found that dewatering extends the tunnel force range, and the tunnel subsidence was positively correlated with groundwater level drop depth. The increase in the tunnel burial depth and distance from the excavation center led to a longer soil unloading transfer path, resulting in reduced disturbance to the tunnel. A smaller intersection angle between the excavation's short edge and the tunnel led to less disturbance of the underlying tunnel, which should be avoided in practical engineering. The developed semi-empirical formulae have sufficient engineering accuracy, guiding the reinforcement of the underlying tunnel.

关键词： collaborative deformation model dewatering energy variance method longitudinal response semi-empirical formula Vlazov foundation

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Optimal control of source-load-storage energy in DC microgrid based on the virtual energy storage system

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ENERGY REPORTS 2023年 9卷 621-630页

作者： Wang, Chang Fu, Shouqiang Zhang, Libin Jiang, Yu Shu, Yinan State Grid Jibei Elect Power Econ Res Inst Beijing 100038 Peoples R China Beijing Jingyan Elect Power Engn Design Co Beijing 100038 Peoples R China North China Elect Power Univ State Key Lab Alternate Elect Power Syst Renewable Baoding 071003 Peoples R China

By integrating controllable source-load in the form of virtual energy storage into the energy storage control system within the DC microgrid, the virtual energy storage system (VESS) with flexible resources can provide a viable solution for the system to effectively accomplish the co-optimization of source-load-energy storage. Firstly, based on the conversion relationship between the rotational kinetic energy of the wind turbine and asynchronous motor and capacitive energy storage, the wind turbine and desalination load are established as virtual energy storage equivalent models;as electric vehicles have both mobile load and energy storage characteristics, the tariff mechanism is used to develop an orderly charging and discharging model to establish a virtual energy storage model for electric vehicles. Secondly, the economic optimization model of the VESS is established jointly with source-load-storage to maximize the intra-day microgrid operation gain, and an energy cooperative optimization control strategy is formed with virtual capacitance value and virtual charge state as operating parameters in each period of time. Finally, it is verified through simulation that the source- load-storage energy co-optimization control can not only relieve the regulation pressure of energy storage in the DC microgrid but also significantly improve the operation economy of the microgrid.(c) 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： Virtual energy storage Active load Electric vehicles Supercapacitor Energy management

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TWO-STAGE TRADING MECHANISM IN ENABLING THE design AND OPTIMIZATION OF FLEXIBLE RESOURCES INTERACTION IN SMART grid

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COMPUTING AND INFORMATICS 2024年第6期43卷 1483-1515页

作者： Chen, Yipeng Li, Huaqiang Liu, Yang Wu, Shuning Li, Xuan Qi, Man Sichuan Univ Coll Elect Engn Key Lab Intelligent Elect Power Grid Sichuan Prov Chengdu 610065 Peoples R China Canterbury Christ Church Univ Sch Engn Technol & Design Canterbury CT1 1QU England

Currently, renewable energy sources (RES) have been widely deployed in the smart grid, especially in the active distribution network (ADN). However, the inherent uncertainty of the renewable energy output significantly impacts the economy of the ADN operation. It is suggested that the utilization of flexible resources (FR) can effectively even out the uncertainty of RES. Nevertheless, the non-marketization of FR may prevent the emerging park-level integrated energy systems (PIES), important entities in ADN, from sufficiently offering their potential flexibilities. Therefore, this paper presents a two-stage local flexibility trading mechanism for motivating multi-PIESs to provide their flexible resources (PFR) to improve the operational flexibility of ADN. The first stage determines the dispatching plan of ADN according to the day-ahead forecasted values of RES. The second stage enables the multi-PIESs to trade their PFR with ADN to adjust the day-ahead dispatching plan in real-time to correct the forecasted errors of RES. In terms of implementing the two stages, firstly, the capacity of PFR with involving the adjustable tie line power of PIES is quantified using an optimization-based as sessment model. Secondly, based on the change of the operation cost before and after the sale of PFR, a pricing model of PFR is established. And then, to determine the trading amount of PFR, a real-time ADN economic dispatching model with the network constraints is further constructed, which aims at minimizing the comprehensive operation cost. Afterwards, a marginal-based method is employed to obtain the clearing price of PFR. Finally, to ensure the feasibility of the trading results and to provide the accurate dispatching strategies for the PFR trading in next time interval, a rolling dispatch for the multi-PIESs is carried out. Case studies demonstrate that the presented flexibility trading mechanism significantly reduces the power curtailment of ADN, the operation costs of ADN and

关键词： Renewable energy active distribution network park-level integrated energy system flexible resources trading mechanism operational flexibility

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TCB Intrusion Detection Method Based on Data Enhancement 10th

TCB Intrusion Detection Method Based on Data Enhancement

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10th International Conference of Pioneering Computer Scientists, Engineers and Educators, ICPCSEE 2024

作者： Ye, Yunlong Zhou, Lin Hu, Xiaobo Wang, Yong Department of Computer Science and Technology Shanghai University of Electric Power Shanghai China State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing China

ISBN: (纸本)9789819787456

Within the online sphere, intrusion detection technology plays an increasingly vital role in safeguarding our information security. The current research on intrusion detection mainly focuses on two aspects: machine learning and deep learning, but it cannot be ignored that data balance also affects the efficiency of intrusion detection. The vast majority of current datasets are imbalanced, and during the training process, the model ignores a few class samples, which affects the efficiency of intrusion detection. Therefore, in response to this issue, this article introduces a novel intrusion detection model that integrates Transformer and CNN-BiLSTM, leveraging WGAN-enhanced data. This model first uses Transformer for global capture, establishes global connections, then uses CNN-BiLTM to capture spatial and temporal features, and finally uses Softmax classifier for classification. The dataset used in this article is NSL-KDD. The experimental results show that after data balance processing, the accuracy of two classification tasks of TCB model reaches 92.19%, which is at least 2.24% higher than other models, and the accuracy of multi classification tasks reaches 82.94%, which is at least 1.03% higher than other models. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Network intrusion

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An upper monitor system design for security packet processing testing based on IEC 60870-5-104 3

An upper monitor system design for security packet processin...

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3rd IEEE International Conference on power, Electronics and Computer Applications, ICPECA 2023

作者： Shengbo, Qu Jiangchao, Li Jing, Zhou Xuesong, Bai Lili, Fu Beijing Chip Microelectronics Technology Co. Ltd. Key Lab of Power Grid Design and Analysis State Grid Corporation of China Beijing China Beijing Intelligent Microelectronics Technology Co. Ltd. Beijing Electric Power High Reliability Integrated Circuit Design Engineering Research Center Beijing100192 China

ISBN: (纸本)9781665472784

To better test the FTU in distribution automation system, this paper designs the upper monitor software for testing the security packets based on IEC104. The article adopts the asynchronous communication to optimize the packet process method and solves the packet disorder, packet loss and retransmission problem which provides ideas for the design of security test system for power distribution terminal equipment. © 2023 IEEE.

关键词： Software testing

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Fail-safe topology optimization for a four-leg jacket structure of offshore wind turbines

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STRUCTURES 2024年 62卷

作者： Lan, Ruo Long, Kai Saeed, Ayesha Geng, Rongrong Chen, Yutang Zhang, Jinhua Tao, Tao Liu, Jie North China Elect Power Univ State Key Lab Alternate Elect Power Syst Renewable Beijing 102206 Peoples R China China Southern Power Grid New Energy Joint Lab Guangzhou 510080 Peoples R China Beijing Univ Technol Fac Mat & Mfg Beijing 100124 Peoples R China China Southern Power Grid Technol Co Ltd Guangzhou 510080 Peoples R China Yanshan Univ Hebei Innovat Ctr Equipment Lightweight Design & M Sch Mech Engn Qinhuangdao 066004 Hebei Peoples R China

Topology optimization (TO) has experienced substantial progress in both scholarly research and practical engineering applications. Recent years have witnessed extensive research on TO approaches incorporating the failsafe concept, with a particular emphasis on potential failures. This paper proposes a TO methodology on the offshore wind turbine (OWT) jacket structure, focusing on the unexpected failure modes. The initial step involves constructing the formulation for maximum-minimization TO. A series of optimized structures can be generated by varying the sizes of individual damage populations and overall failure zones. A 5 MW OWT and jacket structure have been selected as the reference model. The external loads acting on the jacket structure are determined by given environmental conditions, as assessed using the DNV Bladed TM package. The feasibility of an optimized structure is evaluated by comparing its static behaviors, such as maximum displacement and von Mises stress, to those of the reference structure. The investigation focuses on the fundamental frequencies of the optimized structure under various damage populations. The discovery demonstrates the superiority of the suggested methodology in the case of a potential failure.

关键词： Offshore wind turbine Topology optimization Fail-safe design load case

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