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control Engineering and Advanced Algorithms (IWCEAA), International Workshop on

作者： Ying Huang Yuanhong Lu Jie Zhang Jingyue Zhang Haiping Guo National Energy Power Grid Technology R&D Centre Guangzhou 510663 State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou 510663 Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou 510663 Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou 510663 Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou 510663 CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou 510663 Guangzhou China

ISBN: (数字)9798331528881

ISBN: (纸本)9798331528898

The task scheduling problem in power systems is complex, especially when communication costs exceed computation costs. This paper proposes an improved HEFT algorithm with a node merging mechanism, merging nodes through hierarchical traversal to assign high-communication-cost tasks to the same processor, reducing communication overhead. Experiments with 499-dimensional and 1614-dimensional matrices from the power system show that the improved algorithm reduces completion time by 5ms and 2ms, respectively, compared to standard HEFT.

关键词： Costs control engineering Processor scheduling Conferences Merging Power systems Standards

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FGAHOI: Fine-Grained Anchors for Human-Object Interaction detection

arXiv

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arXiv 2023年

作者： Ma, Shuailei Wang, Yuefeng Wang, Shanze Wei, Ying College of Information Science and Engineering Northeastern University Shenyang110819 China Changsha Hisense Intelligent System Research Institute Co. Ltd. and Information Technology R&D Innovation Center of Peking University Shaoxing China

Human-Object Interaction (HOI), as an important problem in computer vision, requires locating the human-object pair and identifying the interactive relationships between them. The HOI instance has a greater span in spatial, scale, and task than the individual object instance, making its detection more susceptible to noisy backgrounds. To alleviate the disturbance of noisy backgrounds on HOI detection, it is necessary to consider the input image information to generate fine-grained anchors which are then leveraged to guide the detection of HOI instances. However, it is challenging for the following reasons. i) how to extract pivotal features from the images with complex background information is still an open question. ii) how to semantically align the extracted features and query embeddings is also a difficult issue. In this paper, a novel end-to-end transformer-based framework (FGAHOI) is proposed to alleviate the above problems. FGAHOI comprises three dedicated components namely, multi-scale sampling (MSS), hierarchical spatial-aware merging (HSAM) and task-aware merging mechanism (TAM). MSS extracts features of humans, objects and interaction areas from noisy backgrounds for HOI instances of various scales. HSAM and TAM semantically align and merge the extracted features and query embeddings in the hierarchical spatial and task perspectives in turn. In the meanwhile, a novel training strategy Stage-wise Training Strategy is designed to reduce the training pressure caused by overly complex tasks done by FGAHOI. In addition, we propose two ways to measure the difficulty of HOI detection and a novel dataset, i.e., HOI-SdC for the two challenges (Uneven distributed Area in Human-Object Pairs and Long distance Visual Modeling of Human-Object Pairs) of HOI instances detection. Experiments are conducted on three benchmarks: HICO-dET, HOI-SdC and V-COCO. Our model outperforms the state-of-the-art HOI detection methods, and the extensive ablations reveal the merits of our

关键词： Anchors

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Influence Analysis and Countermeasure research of dynamic Characteristics of Measurement system on Bridge Arm Current differential Protection in MMC-HVdC system 18

Influence Analysis and Countermeasure Research of Dynamic Ch...

引用

18th International Conference on AC and dC Power Transmission, ACdC 2022

作者： Chen, Qinlei Guo, Qi Lin, Xuehua Huang, Libin Li, Shuyong State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (数字)9781839537615

ISBN: (纸本)9781839537615

Aiming at the action phenomenon of bridge arm current differential protection after AC fault recovery of a modular multilevel converter high voltage direct current (MMC-HVdC) project, the characteristics of differential current are *** influence of temporary block strategy and dynamic characteristics of measurement system on differential current are studied, and the mechanism of differential current and the reasons for the action of bridge arm current differential protection are revealed. Based on the real-time digital physics closed-loop simulation platform, the action phenomenon of bridge arm current differential protection in the field is reproduced and the influence of the dynamic characteristics of the measurement system on the bridge arm current differential protection of the bridge arm is analyzed. The optimization measures are proposed from two aspects: the dynamic performance of the measurement system and the configuration of bridge arm current differential protection. The research results provide technical support for the design of MMC-HVdC project and the impact assessment of dynamic performance of measurement system on MMC-HVdC protection. © ACdC 2022. All rights reserved.

关键词： Simulation platform

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Pressures monitored by 3d printed capacitive pressure sensor embedded on prosthetic upper-limb socket;a case study

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Journal of Biomechanical Science and Engineering 2021年第3期16卷 1-9页

作者： Lee, Sunkon Kwon, Hyeonjung Jung, Sung-Yoon Shin, Hyun-Jun Kwon, Chil-Yong Kim, Joo-Hyung Lab. of Intelligent Devices and Thermal Control Department of Mechanical Engineering Inha University 100 Inha-ro Michuhol-gu Incheon22212 Korea Republic of Advanced Prosthesis R&D Team Korea Orthopedics & Rehabilitation Engineering Center 10 Beon-gilGyeongin-ro Bupyeong-gu Incheon21417 Korea Republic of

The comfort fit of a limb prosthetic socket is one of the most important considerations for developing the socket for an amputee. The pressure at the touchpoint, which is the interface between the residual limb with natural skin and the prosthetic limb socket with a polymeric material, should be monitored precisely when fabricating the comfort fit. Even a small volume or shape discrepancy between the residual limb and prosthetic limb sock causes several problems in the residual limb, such as skin breakage, tissue irritation, and associated pain. Volume variations of the residual limb due to squeezing by a prosthetic limb sock result in pressure changes that can be detected using a pressure sensor. In this study, the interface pressures between the residual limb and prosthetic upper-limb socket were obtained using a 3d printed capacitive pressure sensor. An upper-limb prosthetic socket and capacitive pressure sensor were fabricated using a dual nozzle 3d Fused deposition Modelling technique. Polylactic acid, polylactic acid-carbon black compound, and polyurethane were used as the personalized upperlimb socket and sensing electrode, and substrate material, respectively. The as-fabricated sensors were embedded into the sock wall, and their sensing properties were characterized. For a case study, the sensor-embedded sockets were worn on an amputee's residual upper-limb to characterize empirically the contact pressure occurring at the interfaces. A weight was attached to the end of the limb socket to examine the effects of weight on the local pressures acting on the residual upper limb. The observed interface pressures and pressure distribution at the interface can provide valuable information to clinicians and developers that can guide fit improvements. © 2021. All rights reserved.

关键词： Pressure sensors

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dynamic Security Evaluation Method for Power systems Considering Cascading Failures 7

Dynamic Security Evaluation Method for Power Systems Conside...

引用

7th IEEE Conference on Energy Internet and Energy system Integration, EI2 2023

作者： Liu, ren Xu, Xingye du, Wei Xiahou, Kaishun Zhu, Yihua Chang, dongxu Guo, Hengdao Electric Power Research Institute of China Southern Power Grid Csg Key Laboratory For Power System Simulation Guangzhou China School of Electric Power Engineering South China University of Technology Guangzhou China Electric Power Research Institute of China Southern Power Grid State Key Laboratory of Hvdc Guangzhou China China Southern Power Grid National Energy Power Grid Technology R&d Centre Guangzhou China Intelligent Operation and Control For New Energy Power System Guangdong Provincial Key Laboratory of China Southern Power Grid Guangzhou China

ISBN: (纸本)9798350345094

With the increasing level of informatization and interconnection in the electric power system, the risk of external attacks on power systems is increasing. In response to the drawbacks of traditional static security assessment methods, this paper establishes two security metrics, which are voltage and power flow amplitude deviation security metric and power flow entropy security metric. Based on these security metrics, a dynamic security evaluation model that considers cascading failure is proposed. Simulation results demonstrate that the proposed security metrics can effectively reflect the security of cascading failure propagation, thereby providing valuable insights for decision-making by power system operators. © 2023 IEEE.

关键词： Informatization

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A real-time Framework of Multi-Camera Vehicle Tracking system*

A Real-time Framework of Multi-Camera Vehicle Tracking Syste...

引用

IEEE International Conference on real-time Computing and robotics (rCAr)

作者： Hanyang Zhuang Xingyuan Chen Jianglin Lan Ying Wang Zhaoxuan Lu Chunxiang Wang Ming Yang University of Michigan - Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University Shanghai China James Watt School of Engineering University of Glasgow Glasgow United Kingdom School of Mechanical Engineering Shanghai Jiao Tong University Shanghai China Shanghai Intelligent and Connected Vehicle R&D Center Co. LTD Shanghai China Department of Automation Shanghai Jiao Tong University Shanghai Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai Shanghai Engineering Research Center of Intelligent Control and Management Shanghai China

ISBN: (数字)9798350372601

ISBN: (纸本)9798350372618

Multi-camera vehicle tracking (MCVT) system is a key technology to build an intelligent city and intelligent transportation system. The MCVT system utilizes roadside monitoring devices and computing platforms to achieve city-level road traffic perception at a finer scale by tracking each vehicle on the road to obtain the trajectory. The existing MCVT system mainly focuses on dealing with the algorithm modules separately, without studying the real-time performance and system architecture of the entire pipeline. However, in real-world applications, many of the tricks in improving evaluation metrics are not applicable since there is endless traffic flow running all the time. Therefore, this paper proposes a real-time framework of the MCVT system to streamline all the algorithm modules with proper data flow. Firstly, a multi-threaded multi-vehicle tracking (MVT) module is developed to detect vehicles in each camera. re-identification is implemented during MVT to provide the feature for tracking in the same camera and across different cameras. Then, after the vehicle leaves the camera field of view, the feature of vehicle trajectory is calculated by averaging the feature at each frame. Meanwhile, a background thread runs continuously to match the incoming feature of vehicle trajectory with past features by conducting a topology searching method. In the end, the vehicle trajectories with well-matched features are considered to be the same vehicle. The entire pipeline has been validated on two different datasets, the precision is 0.64 in the CityFlow dataset which uses 6 cameras simultaneously. In the customized dataset, the same method can still reach real-time when using 16 cameras at the same time with smaller network modules.

关键词： Visualization Target tracking roads Human-machine systems Pipelines Urban areas Cameras

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The development of Simulation Mirror system and its Application in HVdC

The Development of Simulation Mirror System and its Applicat...

引用

HVdC (HVdC), International Conference on

作者： Kaijian Ou Wencong Wu Haiqing Cai State Key Laboratory of HVDC Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation National Energy Power Grid Technology R&D Centre Electric Power Research Institute China Southern Power Grid Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (数字)9798350387759

ISBN: (纸本)9798350387766

The testing of HVdC new control function and training of HVdC operation personnel require the integration of power system simulation and dispatching automation. This paper presents and builds AC&dC power system simulation mirror system, which is the closed-loop of real-time digital simulation and dispatching automation. Moreover, the applications of simulation mirror system on HVdC new control function testing and HVdC simulation training cabinet are also introduced in this paper.

关键词： Training Automation HVdC transmission Power system simulation High-voltage techniques dispatching real-time systems Mirrors Personnel Testing

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A capacitor-type dC circuit breaker for offshore all-dC grids

A capacitor-type DC circuit breaker for offshore all-DC grid...

引用

Energy, Power and Electrical Engineering (EPEE), International Conference on

作者： Qianqian Xu Qihui Liu Xipeng Cai Yihua Zhu Chao Luo State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangzhou China Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China

ISBN: (数字)9798331518066

ISBN: (纸本)9798331518073

Full dC of offshore wind farms is the future development trend of large-scale offshore wind farms, however, the probability of dC line faults is high, and the use of dC circuit breakers can realise the fault ride-through of offshore full dC wind farms, improve the safe operation of the system during faults, and is one of the mainstream solutions to realise dC fault isolation. In this paper, a capacitive dC circuit breaker suitable for offshore full dC grid is proposed, which can effectively suppress the fault current by introducing a current limiting device. The topology and working principle of this circuit breaker are analysed, and the circuit breaker fault handling process is theoretically analysed. Finally, for the single-end equivalent system using capacitor-type dC circuit breaker, a simulation model is established in Matlab/Simulink software for verification, and the simulation results show that the proposed circuit breaker has a better current limiting effect and has the ability to isolate faults quickly.

关键词： Thyristors Limiting Circuit breakers Simulation Wind farms Software Topology Circuit faults Fault currents Switching circuits

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Impedance Network Modeling of GFL and GFM Converters system Considering AC/dC Couplings

Impedance Network Modeling of GFL and GFM Converters System ...

引用

IEEE International Conference on Power and Power and renewable Energy (ICPrE)

作者： Kun Zheng Chao Luo Zhiyuan Sun Yihua Zhu Jiawei Yu Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Guangxi Power Grid Electric Power Research Institute China Southern Power Grid Nanning China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guang zhou China

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

With the rapid development of grid-forming (GFM) control technology, integrating GFM control into grid-following (GFL) control-dominated systems has been attached with great importance due to the enhancement of grid supporting capability. To keep the normal operation of such GFL/GFM hybrid system, its small-signal stability needs to be studied, while the current research mainly focuses on the GFL/GFM converters' ac-side dynamics and usually ignore their ac/dc couplings. Therefore, this paper proposes an impedance network modeling method for GFL/GFM multi-converters system, and then a nodal admittance matrix retaining both ac and dc nodes is obtained. With such model, system marginal unstable condition can be accurately determined. Further, the influence of the capacity ratio between GFL and GFM converter is discussed. Simulation results of a typical GFL/GFM hybrid system verify the theoretical analysis.

关键词： Couplings renewable energy sources Grid following Simulation Power system stability Stability analysis Admittance Impedance Matrix converters Grid forming

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Low-Frequency Structure-Borne Noise Identification Based on FastICA-WPA Algorithm

Low-Frequency Structure-Borne Noise Identification Based on ...

引用

International Conference on Advanced robotics and Mechatronics (ICArM)

作者： Qiang Liu Jianxin Zhu National Enterprise R&D Center Hunan Research Center of Geotechnical Construction Equipment and Control Engineering Sunward Intelligent Equipment Co. Ltd. Changsha China State Key Laboratory for High Performance Complex Manufacturing Central South University Changsha China

Low-frequency structure-borne noise in enclosed space is easy to produce booming sensation, which seriously affects the auditory comfort. But its sources are complex and the transmission path is strongly coupled, meanwhile it is difficult to be directly measured by experiments, so making identification difficult. To address the problem of decoupling multi-source mixed signals, this paper proposes a low-frequency structure-borne noise identification method based on FastICA-WPA algorithm. Using FastICA (Fast algorithm of Independent Component Analysis) algorithm to identify the structure-borne noise components in single-channel noise, then WPA (Wavelet Packet Analysis) method is applied to identify the low-frequency components of structure-borne noise. Finally decouple the contribution of low-frequency structure-borne noise. This method is applied to an intelligent excavator cab. The correctness of the method is verified by applying vibration signal correlation analysis. The identification algorithm lays the foundation for developing a low-frequency structure-borne noise control strategy.

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