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Analysis of Transient Characteristics of Asymmetric Fault Current in Offshore Wind Power system Based on Positive and Negative Sequence Decoupling Control

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IET Generation, Transmission and Distribution 2025年第1期19卷

作者： Li, Botong Zheng, Guanghui Zhong, Qing Wang, Shuai Li, Bin State key laboratory of Intelligent Power Distribution Equipment and System Key Laboratory of Ministry of Education on Smart Power Grids School of Electrical and Information Engineering Tianjin University Tianjin China National Industry-Education Platform of Energy Storage Tianjin University Tianjin China

To elucidate the impact mechanism of positive- and negative-sequence decomposition on fault currents in offshore wind AC systems during asymmetrical faults, this study proposes a time-domain method for calculating transient negative-sequence currents. Considering the influence of DSOGI-PLL-based sequence decomposition, the control equation for the negative-sequence transient circuit is derived in the dq-axis coordinate system. The relationship between the negative-sequence component of the grid-side converter (GSC) output voltage modulation signal and the negative-sequence component of the GSC terminal output voltage is analysed, revealing how this discrepancy affects the transient characteristics of the fault negative-sequence current. By integrating the circuit equations in the dq-axis coordinate system, the negative-sequence current control equation, and the relationship between GSC output voltage and modulation voltage, a second-order variable-coefficient differential equation is formulated, constituting the time-domain calculation model for transient negative-sequence current under asymmetrical faults. This model accurately reflects the influence of sequence decomposition and negative-sequence current control on fault currents. Simulation results demonstrate that the model effectively captures transient characteristics such as overshoot and attenuation in the negative-sequence fault current of wind farms under asymmetrical faults, with a steady-state error of less than 3%, providing a theoretical basis for protection scheme development. © 2025 The Author(s). IET Generation, Transmission & Distribution published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.

关键词： Transient analysis

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Advanced Out-of-Step Splitting Protection Simulation Platform with Considering High Frequency Generation Tripping and Low Frequency Load Shedding

Advanced Out-of-Step Splitting Protection Simulation Platfor...

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2022 IEEE International Conference on Power systems and Electrical Technology, PSET 2022

作者： Liu, Ren Zhu, Yukun Zhu, Yihua Chang, Dongxu Wu, Mingkang Huang, Libin a. State Key Laboratory of HVDC b. National Energy Power Grid Technology R&D Centre c. Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System d. CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781665489157

This paper presents an advanced out-of-step (OOS) splitting protection simulation platform considering high frequency generation tripping and low frequency load shedding. In the proposed simulation platform, Real-Time Digital Simulator (RTDS) is utilized as the real-time power system simulator. Through the high-speed I/O card, real industry OOS splitting protection device is integrated into the proposed simulation platform. Based on the real China South Power Grid (CSG) control strategy, high frequency generation tripping and low frequency load shedding components are modelled in the simulation. CSG real grid is modelled in the RTDS to perform the Real-time hardware-in-the-loop simulation. Simulation results present that there is a clear difference between with high frequency generation tripping results and without high frequency generation tripping results. © 2022 IEEE.

关键词： Simulation platform

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Slewing Control of Overhead Crane Based on state-enhance Coupling Method

Slewing Control of Overhead Crane Based on State-enhance Cou...

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第43届中国控制会议

作者： Rui Liu Biao Lu Jinyang Dong Weili Ding The 6th Research Institute of China Electronic Corporation Institute of Intelligence Technology and Robotic Systems Shenzhen Research Institute of Nankai University Engineering Research Center of Intelligent Control System and Intelligent Equipment Ministry of Education Yanshan University National Key Laboratory of Key Technologies for Lifting Machinery Yanshan University

ISBN: (数字)9789887581581

ISBN: (纸本)9798350366907

Cranes which are frequently utilized as sizable machinery, are widely used across a range of settings, including warehouses, distribution hubs, harbors, steel plants, and manufacturing facilities. However, the current researches on cranes have paid insufficient attention to the rotation of loads during transportation. Additionally, some of the proposed control methods fail to effectively integrate information from both actuated DOFs(degrees of freedom) and unactuated DOFs, leading to a loss of controller robustness. In this paper, we establish an overhead crane model with a slewing mechanism, focusing on the analysis of crane's lifting and rotating motion. Based on that, a nonlinear controller is proposed for load slewing control. The stability of the controller is proven using Lyapunov techniques and LaSalle's invariance theorem. The effectiveness and robustness of the controller are validated through numerical simulations.

关键词： Load Rotation Nonlinear Controller Robustness

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Variable stiffness design optimization of fiber-reinforced composite laminates with regular and irregular holes considering fiber continuity for additive manufacturing

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Chinese Journal of Aeronautics 2025年第3期38卷 334-354页

作者： Yi LIU Zunyi DUAN Chunping ZHOU Yuan SI Chenxi GUAN Yi XIONG Bin XU Jun YAN Jihong ZHU School of Mechanics Civil Engineering&ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063China Key Lab for Airborne Hi-performance Electro-magnetic Window RISACJinan 130012China School of System Design and Intelligent Manufacturing Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsInternational Research Center for Computational MechanicsDalian University of TechnologyDalian 116024China State IJR Center of Aerospace Design and Additive Manufacturing MIIT Lab of Metal Additive Manufacturing and Innovative DesignNorthwestern Polytechnical UniversityXi’an 710072China

Fiber-reinforced composites are an ideal material for the lightweight design of aerospace structures. Especially in recent years, with the rapid development of composite additive manufacturing technology, the design optimization of variable stiffness of fiber-reinforced composite laminates has attracted widespread attention from scholars and industry. In these aerospace composite structures, numerous cutout panels and shells serve as access points for maintaining electrical, fuel, and hydraulic systems. The traditional fiber-reinforced composite laminate subtractive drilling manufacturing inevitably faces the problems of interlayer delamination, fiber fracture, and burr of the laminate. Continuous fiber additive manufacturing technology offers the potential for integrated design optimization and manufacturing with high structural performance. Considering the integration of design and manufacturability in continuous fiber additive manufacturing, the paper proposes linear and nonlinear filtering strategies based on the Normal Distribution Fiber Optimization (NDFO) material interpolation scheme to overcome the challenge of discrete fiber optimization results, which are difficult to apply directly to continuous fiber additive manufacturing. With minimizing structural compliance as the objective function, the proposed approach provides a strategy to achieve continuity of discrete fiber paths in the variable stiffness design optimization of composite laminates with regular and irregular holes. In the variable stiffness design optimization model, the number of candidate fiber laying angles in the NDFO material interpolation scheme is considered as design variable. The sensitivity information of structural compliance with respect to the number of candidate fiber laying angles is obtained using the analytical sensitivity analysis method. Based on the proposed variable stiffness design optimization method for complex perforated composite laminates, the numerical examples cons

关键词： Variable stiffness composite laminates Discrete material interpolation scheme Normal distribution fiber optimization Discrete fiber continuous filtering strategy Additive manufacturing of composite laminates

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Practical Research on On-Line Monitoring and Control Function Module of Relay Protection in Smart Substation 18

Practical Research on On-Line Monitoring and Control Functio...

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18th International Conference on AC and DC Power Transmission, ACDC 2022

作者： Huang, Zhida Wu, Wencong Cai, Haiqing Huang, Libin State Key Laboratory of HVDC Electric Power Research Institute CSG Guangzhou510663 China National Energy Power Grid Technology R&D Centre Guangzhou510663 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou510663 China CSG Key Laboratory for Power System Simulation Guangzhou510663 China

ISBN: (数字)9781839537615

ISBN: (纸本)9781839537615

At present, the power grid is carrying out the practical work of smart substation On-line monitoring and control function module of relay protection. Compared with traditional substations, the new-generation assurance system has been greatly improved in 7 functional modules, including fault archiving, special maintenance information patrol, fixed value checking, configuration checking, substation testing, intelligent alarm, and master station modeling. It can fully adapt to the functional requirements of smart substations and traditional substations. This paper analyzes the monitoring and analysis requirements of the assurance system based on the equipment configuration of the station control layer of the new generation of intelligent substations, and proposes a complete design scheme of seven functional modules from three aspects: functional requirements, implementation logic, and performance design. The practical application results in the power grid simulation laboratory show that the On-line monitoring and control function module of relay protection based on the guarantee system can be compatible with the traditional 103 substations and 61850 substations and achieve the expected goals and performance requirements. It has the value of promotion and application. © ACDC 2022. All rights reserved.

关键词： Relay protection

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Design of Axial Modular-Flux Reversal Permanent Magnet Machines with Different Magnetization Modes

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IEEE Transactions on Transportation Electrification 2025年

作者： Xie, Lujia Wang, Yiwei Su, Peng Shen, Yi Civil Aviation University of China School of Electronic Information and Automation Tianjin300000 China Hebei University of Technology State Key Laboratory of Intelligent Power Distribution Equipment and System Tianjin300401 China

This paper investigates the optimal air gap flux density harmonics interaction mechanism of the axial modular flux reversal permanent magnet (AM-FRPM) machines with different magnetization modes. Based on the PM and armature reaction field analysis, the similarities of harmonic interaction mechanism between two AM-FRPM machines are revealed, and then the stator-slot and rotor-pole combinations with higher output torque can be determined. In addition, the optimal modular part angles are deduced to suppress cogging torque based on effective harmonic cooperation. Furthermore, a comparison between the three chosen AM-FRPM machines and the conventional FRPM machine is conducted, and the characteristics are verified by finite-element analysis and experiments. © 2015 IEEE.

关键词： Permanent magnets

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Highly sensitive piezoresistive and thermally responsive fibrous networks from the in situ growth of PEDOT on MWCNT-decorated electrospun PU fibers for pressure and temperature sensing

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Microsystems & Nanoengineering 2023年第5期9卷 73-85页

作者： Yunyun Luo Libo Zhao Guoxi Luo Linxi Dong Yong Xia Min Li Ziping Li Kaifei Wang Ryutaro Maeda Zhuangde Jiang State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesXi’an Jiaotong University(Yantai)Research Institute for Intelligent Sensing Technology and SystemXi’an Jiaotong UniversityXi’anChina School of Mechanical Engineering Xi’an Jiaotong UniversityXi’anChina Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing YantaiChina Ministry of Education Engineering Research Center of Smart Microsensors and Microsystems College of Electronics and InformationHangzhou Dianzi UniversityHangzhouChina Department of Emergency The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’anChina

Flexible electronics have demonstrated various strategies to enhance the sensory ability for tactile perception and wearable physiological *** microstructures have attracted much interest because of their excellent mechanical properties and ***,a structurally robust fibrous mat was first fabricated by electrospinning,followed by a sequential process of functionalization utilizing ultrasonication treatment and in situ polymerization *** polyurethane(PU)microfibers were anchored with multi-walled carbon nanotubes(MWCNTs)to form conductive paths along each fiber by a scalable ultrasonic cavitation treatment in an MWCNT ***,a layer of poly(3,4-ethylene dioxythiophene)(PEDOT)was grown on the surface of PU fibers decorated with MWCNTs to enhance the conductive conjunctions of *** to the superior electromechanical behaviors and mechanical reinforcement of PEDOT,the PEDOT/MWCNT@PU mat-based device exhibits a wide working range(0–70 kPa),high sensitivity(1.6 kPa−1),and good mechanical robustness(over 18,000 cycles).The PEDOT/MWCNT@PU mat-based sensor also demonstrates a good linear response to different temperature variations because of the thermoelectricity of the PEDOT/MWCNT *** novel strategy for the fabrication of multifunctional fibrous mats provides a promising opportunity for future applications for high-performance wearable devices.

关键词： fibers PEDOT conductive

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Integrated Scheduling of Active Distribution Network Considering Capacity Reserves and Ramping Reserves

Integrated Scheduling of Active Distribution Network Conside...

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IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Shengqi Zhou Shimin Zhong Chang Xu Xiaojian Miao Wentao Feng Wengang Wang State Grid Qingdao Power Supply Company Qingdao China Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China

ISBN: (数字)9798331517540

ISBN: (纸本)9798331517557

The widespread integration of renewable energy sources has significantly increased uncertainty levels in active distribution networks. On one hand, traditional open-loop sequential dispatch methods in active distribution networks face difficulties in coordination; on the other hand, the reserve deployment strategy that considers only capacity reserve is insufficient to address short-term fluctuations in renewable energy output. This paper proposes an integrated scheduling model for distribution networks that jointly considers both power-capacity reserves and ramp-capability reserves, which simultaneously optimizes various decision variables including unit startup/shutdown, unit output, and reserves and so on. The model explicitly distinguishes between power capacity reserves and ramp-capability reserves to address the uncertainties brought by renewable energy fluctuations. The requirements for power-capacity and ramp-capability reserves are derived from wind power forecast data. The model manages power trajectories rather than traditional energy blocks, allowing it to respond more precisely to system volatility. The proposed model is tested on the IEEE 33-bus distribution system and compared with the dispatch model considering only capacity reserve, showing a significant improvement in reliability.

关键词： Hands Renewable energy sources Uncertainty Fluctuations Distribution networks Wind power generation Trajectory Power system reliability Active distribution networks Wind forecasting

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6D Grasp Pose Detection in Cluttered Environment from a Single-view

6D Grasp Pose Detection in Cluttered Environment from a Sing...

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IEEE International Conference on robotics and Biomimetics

作者： Enbo Li Yili Fu Haibo Feng Zhejiang Laboratory Intelligent Robot Research Center Hangzhou China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China

Robot grasping has always been a hot topic in the research field, but there are still a lot of problems to be solved. In this paper, we propose a general grasping method for the unknown objects in cluttered environment from a single-view. Our method is divided into three steps: sampling points selection, grasping pose sampling and grasping pose evaluation. Firstly, we generate a pixel-wise probability image based on the trained sampling affordance network from RGB images, and map the points with high probability to the 3D point cloud combined with the depth map. Then, we obtaine the candidate grasps by sampling on the proposal points, and finally we evaluate the candidate grasps through the trained grasp evaluation network. The network can capture the geometric structure represented by the point cloud information. The proposed method directly uses the original sensor data and can increases the sampling success rate.

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An Efficient and Robust Tightly Coupled Framework for Lidar-IMU Localization and Mapping

An Efficient and Robust Tightly Coupled Framework for Lidar-...

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IEEE International Conference on robotics and Biomimetics

作者： Yanwu Zhai Yili Fu Xu Li Intelligent Robot Research Center Zhejiang Laboratory Hangzhou China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China

In this article, we propose a framework for tightly-coupled lidar inertial odometry, which can achieve highly accuracy in real-time ego-motion estimation and map building of the robot. The estimated motion from inertial measurement unit (IMU) preintegration de-skews point clouds. Then, an initialization method based on MAP estimation is used to align the Lidar frame with the world frame and provide reliable initial values for the system. In order to make the scan matching more accurate, we track the state of each frame, and transform the feature points to the reference frame to build a local map for matching with key frames. To ensure high performance in real-time, an efficient sliding window was used to optimize the keyframes we chose. After obtaining the optimized pose of the keyframe, we further optimize the pose of the normal frame by pose constraints. In addition, loop detection is integrated into our algorithm framework to eliminate accumulated errors, making our algorithm to obtain a globally consistent estimate. The experiment results demonstrate that our method can achieve high accuracy in a variety of indoor and outdoor environments even under fast motion conditions or with insufficient features.

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