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Stability analysis of hybrid synchronization controller based grid control

ENERGY REPORTS 2023年 9卷 1291-1298页

作者： Pan, Rongcai Liu, Shan Gu, Huaiguang Liu, Dong Zhu, Lin Chen, Ersong China Elect Power Res Inst Beijing 100192 Peoples R China State Grid Smart Grid Res Inst State Key Lab Adv Power Transmiss Technol Beijing 102209 Peoples R China State Grid Smart Grid Res Inst Beijing Key Lab DC Grid Technol & Simulat Beijing 102209 Peoples R China State Grid Hebei Elect Power Res Inst Shijiazhuang 050021 Peoples R China

Synchronization units are vital for the stable operation of grid-tied converters in generation and transmission. There are two main synchronization units, i.e., phase-locked loop (PLL) and power synchronization controller (PSC), with the corresponding drawbacks in weak and strong grid respectively. Recently, the hybrid synchronization controller (HSC) is proposed in order to make up the deficiencies of PLL and PSC in weak and strong grid respectively. This paper deduces the detailed impedance characteristics of PSC and HSC and compares their cons and pros to show the stability mechanism of HSC. Moreover, two types of HSCs are also presented and compared in this article with slight difference in structure. It is found that the impedance of Type II based HSC has smaller amplitude and better phase margin than PSC around fundamental frequency, while Type I based HSC has larger amplitude and less phase margin than PSC. Type II based HSC can improve the stability and Type I based HSC can worsen the stability compared with PSC. Realtime experiments are carried out to verify this. (c) 2023 Published by Elsevier Ltd. This is an open access article under the CCBY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： Synchronization unit Phase-locked loop Power synchronization Hybrid synchronization Impedance analysis

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Compressed sensing imaging based on mixed blocking method 3

Compressed sensing imaging based on mixed blocking method

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3rd international conference on Optics and Image Processing, ICOIP 2023

作者： Cao, Weiyi Xu, Shuang Tang, Qing Chen, Zhiqiang Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Wuhan430081 China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China Precision Manufacturing Institute Wuhan University of Science and Technology Wuhan430081 China

ISBN: (纸本)9781510667426

The theory of compressed sensing shows that the original signal can be recovered by low sampling rate, so it is often used in the field of optical imaging. To solve the problem of excessive amount of image data and large computational burden, a new method based on column blocking and mixed blocking method is proposed in this paper. Simulation experiments and comparative analysis show that the proposed column blocking method has improved the quality of image reconstruction to a certain extent, while the mixed blocking method has significantly improved the speed and quality of image reconstruction. © 2023 SPIE. All rights reserved.

关键词： Image reconstruction

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Remote Sensing on a Bird-inspired Flapping Wings Robot Combined with LiDAR

Remote Sensing on a Bird-inspired Flapping Wings Robot Combi...

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robotics, Automation and Intelligent control (ICRAIC), international conference on

作者： Lican Wu Yaqi Han Qingyang Zhu Yi Hao Ziming Ye Ruqi Huang Yu Cai H. Y. Fu Shenzhen International Graduate School Tsinghua University Shenzhen Guangdong China School of Electrical Engineering Guangxi University Nanning Guangxi China

The flapping wing robot (FWR), inspired by avian aerodynamics, is a distinct category of unmanned aerial vehicles (UAVs). Different to general UAVs, such as quadcopters, FWRs are featured by their superior aerodynamic capabilities, minimal noise generation, inherent stealth, and lower energy consumption. As a result, they are rapidly becoming vital tools in a variety of civilian and military activities including environmental monitoring, disaster detection, search and rescue operations, ecological conservation, and military manoeuvres. Our study introduces the comprehensive integration of a light detection and ranging (LiDAR) module, serving as a visual perception device, with a large FWR that is equipped with 2-meter, two-segment wings. Based on this setup, the geospatial information of targeted area is captured and compared to the existed topographic data.

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Research of the Gesture control System for a Industrial Robot

Research of the Gesture Control System for a Industrial Robo...

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Electrical engineering and Mechatronics Technology (ICEEMT), IEEE international conference on

作者： Tiansong Liu Changzhou Liu Guojun Branch Jiangsu Union Technical Institute Changzhou China

At present, the programming methods of industrial robots mainly include off-line programming and instructional programming. However, both of the methods are time-consuming and require experienced robotics technicians. In order to improve the interactivity of industrial robot control system, this paper has designed a control system of industrial robot based on hand gestures. The whole system is composed of four parts. The IMU is used in the human hand gesture acquisition, and the signal processing of IMU is analyzed. The relationship between gestures and robot movements in linear motion mode and joint motion mode are analyzed respectively. The ABB IRB 120 robot is used as a test object and its program is designed. Finally, the effectiveness of the method proposed in this paper is validated.

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Research on Application of Meta-learning in Traffic Light Recognition 3

Research on Application of Meta-learning in Traffic Light Re...

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3rd international conference on Digital Signal and Computer Communications, DSCC 2023

作者： Su, Xiaole Wang, Guiping Yang, Ruonan He, Siyu Hu, Jinzhuo School of Electrics and Control Engineering Chang’an University Shaanxi Xi’an China

ISBN: (数字)9781510666566

ISBN: (纸本)9781510666559

Traffic light recognition is essential to intelligent vehicle information perception, and its accuracy directly affects traffic safety. Based on sorting out and analyzing the existing related research on traditional machine learning and deep learning in traffic light recognition, the basic principles of two standard algorithms in meta-learning are introduced in detail. Compared with traditional machine learning, using the MAML algorithm and Reptile algorithms in meta-learning to recognize traffic lights by selecting the WPI dataset and programming in PYTHON. The simulation results show that the recognition accuracy based on the meta-learning algorithm is higher than that based on the traditional machine learning algorithm;In the meta-learning algorithm, the Reptile algorithm outperforms the MAML algorithm. © 2023 SPIE.

关键词： Learning algorithms

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control measures for improving power supply reliability for mountain power supply station based on 462 mode 3

Control measures for improving power supply reliability for ...

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3rd international conference on Electronics, Electrical and Information engineering, ICEEIE 2023

作者： Qiu, Hong Guangzhou Power Supply Bureau of Guangdong Power Grid Corporation Guangzhou China

ISBN: (纸本)9781510671423

In power system operation, more and more attention is paid to the reliability and quality of power supply of the distribution network. As the last kilometer of the power network connecting the user, the reliability of power supply in remote mountainous areas becomes particularly important. This paper takes the power supply reliability improvement measures of a typical remote mountain power supply station as the research object, and improves the management on duty management, safety management and planning management. In the business, it improves the operation reliability of the distribution network through skill training, external construction damage control, tree barrier trimming, lightning protection measures, equipment quality and other methods. Meanwhile, it improves the operation reliability of the distribution network through the planning of medium voltage and low voltage. The feasibility and effectiveness of the measure have been verified through more than one year's operation. © 2023 SPIE.

关键词： Reliability

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Automatic Intravenous Drip Drop Counter and controller 3

Automatic Intravenous Drip Drop Counter and Controller

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3rd international conference on Digital Futures and Transformative Technologies, ICoDT2 2023

作者： Abbasi, Rehan Tariq Zahoor, Aqsa Junaid, Laiba Amin, Faisal Rehman, Zia Ur Pakistan Riphah International University Dept of Biomedical Engineering Islamabad Pakistan

ISBN: (纸本)9798350330816

An intravenous (IV) drip is a surgical device that delivers fluids and drugs directly into a patient's bloodstream via a vein. Although IV drips are a cost-effective, safe, and reliable tool, they also have a number of complications arise when used. The majority of intravenous infusion-related accidents are linked to the administration process' complexity. Therefore, the creation of an automated intravenous administration technique is necessary. In the proposed work the risks connected with the use of IV are examined, and a method is proposed to make IV drip monitoring and control possible based on sensing of drops passing through the drip chamber. Also in this study, the sensor-observed experimental drop rate is compared to a manually measured drop rate. Different parameters are calculated based on the automatic counting of fluid drops, with the infusion volume and flow rate being the two most crucial ones. The usage of such a device may lessen complications and give IV drip system users affluence. © 2023 IEEE.

关键词： Drops

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Underwater image saliency detection based on refined attentional feedback mechanism 3

Underwater image saliency detection based on refined attenti...

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3rd international conference on Computer Graphics, Image, and Virtualization, ICCGIV 2023

作者： Liu, Meisheng Yu, Weiwei Information Engineering Department Shanghai Maritime University 1550 Harbor Ave. Pudong New Area Shanghai201306 China

ISBN: (纸本)9781510671720

Underwater image saliency detection makes the terrestrial saliency detection model less effective in the application of underwater vehicles due to factors such as turbid water and unstable light, resulting in a degradation of the model's performance. We offer a model for underwater saliency detection based on an improved attentional feedback mechanism to overcome the aforementioned issues. The features at the top and bottom levels are effectively fused by forming a cascaded feedback decoder through the cross feature module and adding channel space attention, after which the residual refinement module is added for further refinement. The training and testing process uses underwater open datasets. The experimental findings demonstrate that our method is superior to other ways in comparative analysis with four general saliency detection methods and two underwater saliency detection methods on four underwater image datasets, proving the model's viability and efficacy. © 2023 SPIE.

关键词： Feedback control

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Optimal design of middle-wavelength infrared dual field-of-view optical system 3

Optimal design of middle-wavelength infrared dual field-of-v...

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3rd international Computing Imaging conference, CITA 2023

作者： Peipei, Yan Huaili, Zhang Kai, Liu Kai, Jiang Jing, Duan Qiusha, Shan The Photoelectric Measurement and Control Technology Research Department Xi’an Institute of Optics and Precision Mechanics Chinese Academy Sciences Xi’an710119 China Space Engineering University Beijing101416 China

ISBN: (纸本)9781510671409

A middle infrared dual field-of-view(FOV) optical system with staring focal plane array and reimaging optics is presented for cool 640×512 detector. Based on zoom system principle and optical design software, the Modulation Transfer Function (MTF)curve, spot diagram, and the encircled energy are *** design results show that this system can realize 300mm/600mm dual field-of-view at the spectrum region of 3.7～4.8um and the F number of 4, which can obtain the cold shield efficiency of 100% and the MTF more than 0.2 at the spatial frequency of 33lp/*** optical system is analyzed in two modes of long focal length and short focal length, results show that it has the advantages of simple structure, high image quality, low price and easy to adjustment. © 2023 SPIE.

关键词： Optical systems

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Multi-parametric analysis of burn based on dual-detection polarization-sensitive optical coherence tomography 3

Multi-parametric analysis of burn based on dual-detection po...

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3rd international Computing Imaging conference, CITA 2023

作者： Li, Dezi Deng, Ye Deng, Xiaopeng Key Laboratory of Intelligent Control Technology for Wuling-Mountain Ecological Agriculture in Hunan Province Huaihua University Huaihua418008 China

ISBN: (纸本)9781510671409

The evaluation of burn degree is a key step to guide the treatment of patients with thermal injury. In this work, multiple parameters including intensity, accumulative and local birefringence features based on dual-detection polarization sensitive optical coherence tomography (PS-OCT) are proposed to quantitatively describe the information of skin burn. The results demonstrated that the intensity and the cumulative phase retardation and local phase retardation information of skin decrease with the burn degrees, since thermal damage to the collagen structure of dermal layer. In addition, the slopes of accumulative phase retardation dependent of depth are extracted for characterization of normal and damaged skins. Finally, the local phase retardation not only distinguishes the normal and damaged skin, but also evaluates the burn depth. Therefore, multiple parameters using dual-detection PS-OCT can detect the anisotropic change of birefringence of skin tissue caused by thermal injury and reveal the potential for burn assessment. © 2023 SPIE.

关键词： Birefringence

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