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ANALYSIS OF THE AMPLITUDE AND FREQUENCY CHARACTERISTIC OF STEAM TURBINE GENERATOR'S INTERNAL VOLTAGE UNDER ASYMMETRIC FAULT IN SERIES COMPENSATION SYSTEM 10

ANALYSIS OF THE AMPLITUDE AND FREQUENCY CHARACTERISTIC OF ST...

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10th Renewable Power Generation Conference, RPG 2021

作者： Chen, Yanrui Hu, Jiabing Li, Yingbiao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781839536069

A thermal power transmission system via series capacitor compensation is a common transmission method in the power system. The series capacitor compensation is utilized to improve the transmission capacity of the transmission line. However, it may cause rotor shaft torque amplification of the steam turbine generator during the transient process, and especially have a non-negligible impact on internal voltage amplitude and frequency characteristics of the generator under the system asymmetric fault. Based on the rotor shaft model of the steam turbine generator in the IEEE sub-synchronous oscillation first benchmark model, the no-load internal voltage expression of the steam turbine generator considering the shaft oscillation is calculated in this paper firstly. Furthermore, the influence of the rotor mode on the generator's internal voltage under the series compensation system asymmetric fault is obtained by analytical calculation, DQG the amplitude and frequency time-varying characteristics are summarized. Finally, the corresponding system model is built in PSCAD/EMTDC to verify the correctness of the analytical expression and time-varying characteristic of the internal voltage. © The Institution of engineering and technology.

关键词： Electric power transmission

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(Ba,K)Fe_(2)As_(2)铁基超导多芯线材的晶间耦合强化与性能提高

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Science China Materials 2024年第1期67卷 301-310页

作者：郭文文姚超熊颢杨鹏涂畅马衍伟 Key Laboratory of Applied Superconductivity Institute of Electrical EngineeringChinese 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 and Engineering Zhengzhou UniversityZhengzhou 450001China

铁基超导材料在高场超导磁体领域具有很大的应用潜力,而研究具有高传输临界电流密度的多芯复合包套线材对于其实际应用至关重要.本研究基于粉末装管法,结合孔型轧制工艺和热等静压烧结工艺制备了多芯Cu/Ag复合包套(Ba,K)Fe_(2)As_(2)(Ba... 详细信息

铁基超导材料在高场超导磁体领域具有很大的应用潜力,而研究具有高传输临界电流密度的多芯复合包套线材对于其实际应用至关重要.本研究基于粉末装管法,结合孔型轧制工艺和热等静压烧结工艺制备了多芯Cu/Ag复合包套(Ba,K)Fe_(2)As_(2)(Ba-122)超导线材.通过对不同直径线材中Ba-122超导芯的质量密度、晶粒取向、晶粒尺寸、元素分布与线材的电流传输性能之间的关系进行系统研究,我们发现线径较小的样品中超导晶粒间的耦合得到了显著增强,其传输临界电流密度在4.2 K,10 T下达到3.3×10^(4)A cm^(-2),同时由于晶粒尺寸和超导芯丝的均匀性得到改善,其电流传输的一致性(n值)也获得有效提高.本研究为制备高性能、高度均匀的铁基超导多芯线材提供了一种可规模化的工艺路线,对促进铁基超导材料的高场强电应用有重要意义.

关键词：热等静压烧结孔型轧制晶粒取向临界电流密度晶粒间质量密度晶粒尺寸工艺路线

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Coordinated Control Strategy for Multi Hybrid Active Power Filters

Coordinated Control Strategy for Multi Hybrid Active Power F...

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2025 International Conference on Electrical Automation and Artificial Intelligence, ICEAAI 2025

作者： Wang, Chen Yang, Bo Wu, Yutong Li, Mingshu Li, Xingyang Yin, Jingyuan State Grid Beijing Electric Power Company Beijing China Institute of Electrical Engineering Chinese Academy of Sciences Beijing China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan China Shandong Key Laboratory of Advanced Electromagnetic Conversion Technology Jinan China

ISBN: (纸本)9798331506797

With the development of new power systems and power electronics technology, the power system in the 'double high' scenario faces certain challenges in harmonic control. To achieve precise real-time control of harmonics, this article proposes a collaborative control strategy for multi hybrid active power filters (HAPF). Based on Silicon Carbide Metal-Oxide-Semiconductor Field-Effect Transistor (SiC-MOSFET) novel power components, a modular HAPF was constructed, the active and passive parts were connected through coupling inductance to output effective compensation current. To achieve real-time and accurate detection of harmonics, an adaptive filter is constructed by combining Least Mean Square (LMS) and Least Mean Squared (LMF) method, and adaptively update the weight step size based on the error results. A coupling evaluation index was constructed by introducing the relative gain matrix (RGA), considering the compensation performance, capacity allocation, and coupling effects of each HAPF, the optimal allocation of compensation current for each device is determined. The simulation results showed that the proposed method can accurately detect and compensate for system harmonics through collaborative control of multiple HAPF, thereby improving the power quality of the power system. © 2025 IEEE.

关键词： Adaptive harmonic detection Cooperative Control HAPF Harmonic compensation RGA

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Finite element analysis of pile expansion by shock wave of metal wire explosion in liquids

Finite element analysis of pile expansion by shock wave of m...

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China International Electrical and Energy Conference (CIEEC)

作者： Yi Liu Shijie Huang Yong Zhao Youlai Xu Tianyu Wang Fuchang Lin Hua Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology & Key Laboratory of Pulsed Power Technology Huazhong University of Science and Technology Wuhan China

Construction of specially shaped pile foundations by compacting the soil around the borehole with shock waves, which can effectively increase the load-bearing capacity of the pile material. The metal wire explosion in liquid has the advantages of high energy efficiency, good repeatability and controllability. The strong shock wave generated by the explosion can compress the soil to enlarge the size of pile foundations and construct shaped pile foundations, which has industrial prospects. In order to analyze the mechanism of pile expansion by metal wire explosion in liquid, a test platform was established, and parameters such as discharge voltage, current and energy were obtained. Based on the dynamic analysis software Ls-dyna, a two-dimensional simulation model of the shock wave generated by explosion in liquid acting on the soil was established, and the material parameters and model dimensions were reasonably determined. The propagation and attenuation processes of shock waves in cement slurry and soil were numerically simulated. The cumulative effect of pile foundation expansion under the action of multiple shock waves was analyzed, and compared with the test results.

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Coordinated Control Strategy for Multi Hybrid Active Power Filters

Coordinated Control Strategy for Multi Hybrid Active Power F...

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Electrical Automation and Artificial Intelligence (ICEAAI), International Conference on

作者： Chen Wang Bo Yang Yutong Wu Mingshu Li Xingyang Li Jingyuan Yin State Grid Beijing Electric Power Company Beijing China Institute of Electrical Engineering Chinese Academy of Sciences Beijing China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan China Shandong Key Laboratory of Advanced Electromagnetic Conversion Technology Jinan China

ISBN: (数字)9798331506797

ISBN: (纸本)9798331506803

With the development of new power systems and power electronics technology, the power system in the “double high” scenario faces certain challenges in harmonic control. To achieve precise real-time control of harmonics, this article proposes a collaborative control strategy for multi hybrid active power filters (HAPF). Based on Silicon Carbide Metal-Oxide-Semiconductor Field-Effect Transistor (SiC-MOSFET) novel power components, a modular HAPF was constructed, the active and passive parts were connected through coupling inductance to output effective compensation current. To achieve real-time and accurate detection of harmonics, an adaptive filter is constructed by combining Least Mean Square (LMS) and Least Mean Squared (LMF) method, and adaptively update the weight step size based on the error results. A coupling evaluation index was constructed by introducing the relative gain matrix (RGA), considering the compensation performance, capacity allocation, and coupling effects of each HAPF, the optimal allocation of compensation current for each device is determined. The simulation results showed that the proposed method can accurately detect and compensate for system harmonics through collaborative control of multiple HAPF, thereby improving the power quality of the power system.

关键词： Couplings Performance evaluation Adaptive systems Heuristic algorithms Collaboration Harmonic analysis Active filters Real-time systems Resource management Power harmonic filters

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Optimal Reference Primary Flux Based Model Predictive Control of Linear Induction Machine With MTPA and Field-Weakening Operations for Urban Transit

Optimal Reference Primary Flux Based Model Predictive Contro...

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作者： Xu, Wei Tang, Yirong Dong, Dinghao Xiao, Xinyu Rashad, Essam Eddin M. Junejo, Abdul Khalique Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China Tanta University Department of Electrical Power and Machines Engineering Faculty of Engineering Tanta31111 Egypt

The linear induction machine (LIM) in urban transit suffers from poor efficiency and thrust decay due to the large air-gap length, longitudinal end effect, and the light load operating conditions. Maximum thrust per ampere (MTPA) is one of the effective methods to improve the motor efficiency by minimizing the conduction loss. However, when MTPA is introduced in model predictive control as an additional constraint, traditional methods inevitably need to add more weighting factors in the cost function. To further improve the performance of LIM drives and eliminate the weighting factors, this article proposes an optimal reference primary flux based model predictive control (ORPF-MPC) for LIM. The ORPF containing MTPA condition is derived and introduced as the only criterion in cost function to achieve the control goal without using any weighting factors. Furthermore, the ORPF is extended to the field-weakening operation, which significantly widens the operating range and nearly achieves the optimal thrust capability to mitigate the thrust decay of LIM. Finally, the proposed ORPF-MPC is implemented with simplified arbitrary double vectors to remove the restriction on the selection of voltage vector pairs and further reduce the flux and thrust ripples. The proposed method is comprehensively investigated on one 3 kW arc induction machine, and its effectiveness is fully validated through both simulation and experimental results. © 1972-2012 IEEE.

关键词： Model predictive control

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MMDDI-MGPFF: Multi-Modal Drug Representation Learning with Molecular Graph and Pharmacological Feature Fusion for Drug-Drug Interaction Event Prediction

MMDDI-MGPFF: Multi-Modal Drug Representation Learning with M...

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2024 IEEE International Conference on Bioinformatics and Biomedicine, BIBM 2024

作者： Wang, Guishen Guo, Zhitong You, Guilin Xu, Ming Cao, Chen Hu, Xiaowen School of Life Sciences Jilin University Changchun China College of Computer Science and Engineering Changchun University of Technology Changchun China Key Laboratory for Bio-Electromagnetic Environment and Advanced Medical Theranostics School of Biomedical Engineering and Informatics Nanjing Medical University Nanjing China School of Biomedical Engineering and Informatics Nanjing Medical University Nanjing China

ISBN: (纸本)9798350386226

Drug-drug interactions pose a significant challenge in healthcare, directly impacting patient safety and treatment efficacy. Although recent advances in computational methods have improved drug-drug interaction (DDI) event prediction, many existing models face difficulties in effectively fusing features across different DDI tasks. To address these limitations, we introduce MMDDI-MGPFF, a novel multi-modal drug representation learning framework that integrates molecular graphs and pharmacological feature fusion to improve DDI prediction. Our model leverages a graph isomorphism network (GIN) for efficient encoding of molecular structures, coupled with an autoencoder for learning sequence-based drug features, encompassing both biological and pharmacological characteristics. We propose a multi-modal fusion approach that employs multi-head attention and deep neural networks to seamlessly integrate these graph and sequence modalities. Comprehensive experiments on a benchmark dataset demonstrate that MMDDI-MGPFF significantly outperforms state-of-the-art methods in DDI prediction tasks. Ablation studies further corroborate the efficacy of our model's components, particularly the GIN and the integration of multi-feature drug representations. This work advances the field of DDI prediction by providing a more holistic and accurate approach to drug representation and interaction modeling. © 2024 IEEE.

关键词： Deep neural networks

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Stability Analysis of Multiple Grid-Connected Battery Energy Storage Systems with A Distributed Cooperative Control

Stability Analysis of Multiple Grid-Connected Battery Energy...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Chen, Yin Chen, Yuntao Li, Wentian Chen, Xia Zhao, Xianxian University of Strathclyde Department of Electronic and Electrical Engineering GlasgowG1 1XW United Kingdom State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China School of Electrical and Electronic Engineering University College Dublin DublinD04 V1 W8 Ireland

ISBN: (纸本)9798331530174

Battery Energy Storage System (BESS) plays a crucial role in the integration of renewable energy by balancing supply and demand, providing frequency regulation, and supporting voltage stability. However, for multiple grid-connected BESS systems, traditional power control methods, which focus on the dynamics of individual BESS, often neglect the interactions between BESSs. It results in idle power capacity and slow response times during transient events. To address these issues, a distributed cooperative control strategy based on a consensus algorithm has been proposed to improve the overall system's response speed and ensure steady-state power sharing according to the state of charge (SOC). However, few researchers have conducted the stability analysis of multiple BESSs under the distributed control scheme, and the interaction has not been thoroughly investigated. This paper addresses this gap by developing an impedance model for multiple BESSs by incorporating distributed cooperative control. With the impedance model proposed, the superiority of the BESSs with distributed cooperative control is demonstrated through a stability analysis comparison with traditional power control methods. Additionally, the study examines the impact of distributed cooperative control parameters and communication faults on the system stability. Simulations are conducted to validate the developed impedance model and the stability analysis results. © 2024 IEEE.

关键词： State of charge

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Effects of Active and Reactive Power Control on Inertia in DFIG-Based Wind Turbines

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IEEE Transactions on Power Electronics 2025年

作者： Guo, Xiang Tang, Qingbo Zhu, Donghai Zhou, Yini Zou, Xudong Hu, Jiabing Kang, Yong China University of Mining and Technology School of Electrical Engineering Xuzhou221116 China Hubei Key Laboratory of Marine Electromagnetic Detection and Control Wuhan430064 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

The inertia analysis for wind turbines (WTs) typically focuses on the electromechanical timescale. Active power control (APC) and phase-locked loop (PLL) are essential considerations while reactive power control (RPC) is often deemed negligible, particularly in stiff grid. However, such assumptions may be inappropriate. Therefore, this article aims to comprehensively examine the effects of APC and RPC on the inertia for doubly fed induction generator (DFIG)-based WTs. Firstly, phase motion models are developed by incorporating various combinations of control loops, including APC, RPC, and different PLL configurations. Subsequently, the impacts of the APC and RPC on the inertia are examined in detail. The analysis reveals that the APC diminishes inertia, whereas the RPC significantly enhances the inertia. Additionally, special attention should be given to phase characteristics of the inertia transfer function, as they can substantially influence inertial performance. Furthermore, an improved frequency support method is proposed, which achieves superior frequency response without necessitating the PLL bandwidth to be adjusted to extremely low values, such as 1 Hz or lower. Finally, the analysis and the proposed method are validated through experiments. © 1986-2012 IEEE.

关键词： Wind turbines

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Comparative Study of Hybrid PM Assisted Synchronous Reluctance Machines with Different Configurations

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IEEE Transactions on Industry Applications 2025年

作者： Chen, Wutao Wang, Yawei Liu, Xinhua Shi, Yu Zhao, Yiru Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China Investment Ltd Shanghai200050 China

In this paper, the rotor topology of hybrid permanent magnet assisted synchronous reluctance machines (HPM-SynRMs) with parallel, series and parallel-series configurations is given and the analytical models are presented. Based on the analytical models, a method for determining the initial dimensions of the rotors topology is presented. In the subsequent optimization process, a comparative analysis of the torque components, cost, external characteristics, and efficiency of the three motor configurations is conducted. The selected optimal design is compared with the reference PM machine under both overload and rated conditions. The results indicate that the HPM-SynRM achieves higher torque performance under overload conditions and slightly lower torque under rated conditions compared to the reference machine, while reducing the PM cost by 34.4%. Finally, a prototype is developed to validate the simulation results. © 1972-2012 IEEE.

关键词： Permanent magnets

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