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Consensus control of second-order stochastic discrete-time multi-agent systems without velocity transmission

control Theory and Technology 2023年第4期21卷 591-601页

作者： Zi-Xuan Wang Xiaofeng Zong Ling-Jie Gai School of Automation China University of GeosciencesWuhan430074China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems WuhanHubeiChina Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of EducationWuhanHubeiChina

This article studies the almost-sure and the mean-square consensus control problems of second-order stochastic discrete-time multi-agent systems with multiplicative ***,a control law based on the absolute velocity and relative position information is ***,considering the existence of multiplicative noises and nonlinear terms with Lipschitz constants,the consensus control problem is solved through the use of a degenerated Lyapunov ***,for the linear second-order multi-agent systems,some explicit consensus conditions are ***,two sets of numerical simulations are performed.

关键词： Consensus control Multiplicative noises Second-order Discrete-time Multi-agent system

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A Magnetoelectric Permanent-Magnet Synchronous Motor with a Magnetically Asymmetric Rotor

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Russian Electrical engineering 2022年第1期93卷 6-10页

作者： Afanasyev, A.A. Department of Automation and Control in Engineering Systems Ulyanov Chuvash State University Cheboksary428015 Russia

Abstract: A permanent-magnet synchronous motor (PMSM) with permanent magnets with unequally magnetized individual poles of the rotor is considered. In this engine, the magnetic induction in the air gap contains not only the main harmonic, but also a lower-order harmonic. The inductances of the mutual induction of the rotor with the stator-winding phases are analyzed. The working properties of a PMSM with a magnetically asymmetric rotor are studied on the basis of its mathematical model in the d and q coordinates. In this model, the stator current contains only a transverse component. In this case, the PMSM delivers the maximum electromagnetic torque at a given current. It is shown that significant pulsations of the current and electromagnetic torque of the engine are generated even with a 5% decrease in the magnetization of the magnet of one pole of the rotor. © 2022.

关键词： Permanent magnets

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Influence of Non-uniform Parameter of Bolt Joint on Complexity of Frequency Characteristics of Cylindrical Shell

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Chinese Journal of Mechanical engineering 2023年第2期36卷 206-219页

作者： Qiansheng Tang Houxin She Chaofeng Li Bangchun Wen School of Engineering Anhui Agricultural UniversityHefei 230036China School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China Key Laboratory of Vibration and Control of Aero‑Propulsion System Ministry of EducationNortheastern UniversityShenyang 110819China

Bolt connection is one of the main fixing methods of cylindrical shell structures.A typical bolted connection model is considered as a tuned ***,in the actual working conditions,due to the manufacturing error,installation error and uneven materials of bolts,there are always random errors between different *** investigate the influence of non-uniform parameters of bolt joint,including the stiffness and the distribution position,on frequency complexity characteristics of cylindrical shell through a statistical method is the main aim of this *** bolted joints considered here were simplified as a series of springs with random *** vibration equation of the bolted joined cylindrical shell was derived based on Sanders’thin shell *** Monte Carlo simulation and statistical theory were applied to the statistical analysis of mode characteristics of the ***,the frequency and mode shape of the tuned system were investigated and compared with ***,the effect of the random distribution and the random constraint stiffness of the bolts on the frequency and mode shape were *** the statistical analysis on the natural frequencies was evaluated for different mistuned *** some special cases were presented to help understand the effect of random *** research introduces random theory into the modeling of bolted joints and proposes a reference result to interpret the complexity of the modal characteristics of cylindrical shells with non-uniform parameters of bolt joints.

关键词： Bolted joint Random mistuning Shell vibration Mode shape Statistical analysis

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The Design Optimization of the High-Frequency Planar Transformers for Electric Vehicle Chargers 7

The Design Optimization of the High-Frequency Planar Transfo...

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7th IEEE International Electrical and Energy Conference, CIEEC 2024

作者： Zhang, Li Shen, Min Wang, Xiaozhou Zhao, Shuang Li, Helong Yang, Zhiqing Ding, Lijian School of Electrical and Automation Engineering Hefei University of Technology HeFei China School of Intelligent Manufacturing and Control Engineer Qilu Institute of Technolgy Jinan China School of Electrical and Automation Engineering Hefei University of Technology China

ISBN: (纸本)9798350359558

Electric vehicle chargers can be divided into high-voltage DC (HVDC) system for charging power battery and low-voltage DC (LVDC) system for supplying low-voltage battery. Since the next generation EVs is getting smarter, they calls for chargers with higher power rating, higher power density and reduced loss which poses challenges for the LVDC systems design. In this paper, LLC resonant DC/DC converter is selected for HVDC system and two-stage converter with a Buck/Boost converter and an SRC converter is used for LVDC system. Circuit parameter design and high frequency (HF) planar transformer design are conducted for the aforementioned two kinds of converters respectively. For HVDC system, a transformer integrating resonant inductance and magnetizing inductance on a core is designed, and for LVDC system, a quarter-turn transformer is designed. The rationality and high efficiency of the two high HF planar transformer designs are verified by simulation and experiment results. © 2024 IEEE.

关键词： Inductance

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Distributed Formation control of Heterogeneous Multi-agent Systems with Nonlinear Dynamic Performance 24

Distributed Formation Control of Heterogeneous Multi-agent S...

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6th International Conference on control and Computer Vision, ICCCV 2024

作者： Cao, Runxi Liu, Jia Du, Jiayi Zhang, Yunxi School of Automation and Electrical Engineering Tianjin University of Technology and Education Tianjin China Tianjin Key Laboratory of Information Sensing and Intelligent Control School of Automation and Electrical Engineering Tianjin University of Technology and Education Tianjin China

ISBN: (纸本)9798400718045

This paper studies the formation control problem of heterogeneous multi-agent systems. We consider a heterogeneous multi-agent system with the first-order linear leaders and second-order nonlinear followers. A distributed formation control protocol is devised to make the system achieve formation control. Furthermore, using Lyapunov stability theory and linear matrix inequality method the stability analysis of the system is conducted, and the sufficient condition is presented for successful formation control in heterogeneous multi-agent systems. Finally, a numerical simulation example is provided to validate the obtained results. © 2024 Copyright held by the owner/author(s). Publication rights licensed to ACM.

关键词： Linear matrix inequalities

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Dynamic J-A Hysteresis Model Correction of Iron Core Components and EMTP Program Implementation 7

Dynamic J-A Hysteresis Model Correction of Iron Core Compone...

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7th International Conference on Electric Power Equipment - Switching Technology, ICEPE-ST 2024

作者： Chen, Xi Chen, Lian School of Electrical Engineering and Automation Xiamen University of Technology Xiamen China School of Electrical Engineering and Automation Xiamen University of Technology Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control Xiamen China

ISBN: (纸本)9798350388947

Despite Jiles-Atherton (J-A) hysteresis theory has been widely used in the analysis of magnetic properties of iron core components in electric power equipment, the transient modeling of switching device considering hysteresis characteristics remains more challenging given that most electromagnetic transient simulation software lacks a practical dynamic J-A hysteresis inductor model. A J-A hysteresis inductor model considering the iron core's dynamic loss was developed with the Electromagnetic Transients Program-Alternative Transients Program (EMTPATP) in this study. The classical J-A hysteresis theory was first modified from the perspective of energy conservation equation. Then, the differential equations of the J-A hysteresis model considering dynamic loss were derived according to the field separation and statistical theory of losses, and the final J-A model parameters were determined by particle swarm optimization (PSO) algorithm. The modified dynamic J-A hysteresis model was programmed by Model Language using the Type-94 component in EMTP-ATP, thereby obtaining a dynamic J-A hysteresis inductor model that can be used for electromagnetic transient simulation. The proposed model was verified by sinusoidal excitation test and harmonic excitation simulation. The results show that the excitation simulation outcomes of the dynamic J-A hysteresis inductor model were well fit in the measured data, and it could work stably under harmonic excitation condition, which verifies the feasibility of this model. © 2024 IEEE.

关键词： Electromagnetic transients

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Low-Voltage Series Arc Fault Detection Method Based on VMD 7

Low-Voltage Series Arc Fault Detection Method Based on VMD

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7th International Conference on Electric Power Equipment - Switching Technology, ICEPE-ST 2024

作者： Tang, Qiaojia Chen, Li'an Li, Wenxuan School of Electrical Engineering and Automation Xiamen University of Technology Xiamen China School of Electrical Engineering and Automation Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control Xiamen University of Technology Xiamen China

ISBN: (纸本)9798350388947

Aiming at the current situation that the traditional overcurrent protection device is difficult to detect the low-voltage series arc fault, a detection model for low-voltage series fault arc based on Variational Mode Decomposition (VMD) was proposed, utilizing a VMD method optimized by the Whale Optimization Algorithm (WOA). Firstly, WOA was used to optimize the VMD parameters of different loads to decompose the signal. Then, a multi-feature data set was constructed by combining Pearson correlation coefficient and random forest importance assessment. Finally, combined with support vector machine, a low-voltage series arc fault detection model was built. The results show that the accuracy of the proposed arc fault detection method is more than 99 %, and it is suitable for a variety of typical loads. © 2024 IEEE.

关键词： Overcurrent protection

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10KV Switchgear Temperature Field Analysis and Product Structure Optimization Research 7

10KV Switchgear Temperature Field Analysis and Product Struc...

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7th International Conference on Electric Power Equipment - Switching Technology, ICEPE-ST 2024

作者： You, Yimin Lin, Jing Dai, Dongyun Sang, Zhongqing School of Electrical Engineering and Automation Xiamen University of Technology Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control Xiamen China School of Electrical Engineering and Automation Xiamen University of Technology Xiamen China

ISBN: (纸本)9798350388947

Human activities have caused a series of environmental problems such as the greenhouse effect, ozone hole, etc. And the global ecological balance has been seriously damaged. Against this background, in order to implement the goal of carbon peaking and carbon neutrality and to realize the green and low-carbon development in China, the country is paying more and more attention to the development and utilization of solar energy, wind energy and other clean energy sources, and therefore, the market demand for photovoltaic and wind power stations in the 10kV switchgear market is gradually increasing. The stable operation of switchgear plays a pivotal role in maintaining the reliable operation of the power system. Whether the switchgear can be operated stably directly affects the reliability of the power system, and a series of aging and damage triggered by heat in the switchgear is the most common and the most important type of failure of the switchgear. Therefore, this paper will be based on the theory of heat generation of electrical appliances, heat transfer theory and airflow field theory and other related theories, synthesize the current status of research at home and abroad and the calculation method of temperature distribution, KYN-type 10kV switchgear as the object of research, its modeling, simulation analysis, and optimization of its temperature rise condition. This study provides important reference significance for the stable operation of 10KV switchgear in the power system. © 2024 IEEE.

关键词： Heat losses

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Ferromagnetic Resonance Fault Identification of 10kV Electromagnetic Voltage Transformer 7

Ferromagnetic Resonance Fault Identification of 10kV Electro...

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7th International Conference on Electric Power Equipment - Switching Technology, ICEPE-ST 2024

作者： Gao, Ji Chen, Li'an Guan, Mengxue School of Electrical Engineering and Automation Xiamen University of Technology Xiamen China School of Electrical Engineering and Automation Xiamen University of Technology Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control Xiamen China

ISBN: (纸本)9798350388947

With the increasing development of power grids, the problem of ferroresonance in neutral-point non-grounded power distribution systems is becoming more and more serious. Due to the close similarities in characteristics between single-phase grounding fault overvoltage and ferroresonance overvoltage, in order to correctly diagnose the type of overvoltage, firstly, the simulation model was built by PSCAD to obtain the simulation waveform of different faults. Then, the resonance overvoltage fault feature extraction method based on VMD was constructed by MATLAB. Finally, by comparing the influence of the number of input layer nodes and the number of hidden layer neurons on the BP neural network, the BP neural network was optimized by MATLAB to achieve the identification of ferroresonance and normal working, grounding fault states, and provide a reliable judgment standard for the action of protection devices. © 2024 IEEE.

关键词： MATLAB

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Analysis of Temperature Fields of a 10kV Electromagnetic PT Under Ferroresonance 7

Analysis of Temperature Fields of a 10kV Electromagnetic PT ...

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7th International Conference on Electric Power Equipment - Switching Technology, ICEPE-ST 2024

作者： Wu, Zhiwei Chen, Li'an Guo, Mengqian School of Electrical Engineering and Automation Xiamen University of Technology Xiamen China School of Electrical Engineering and Automation Xiamen University of Technology Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control Xiamen China

ISBN: (纸本)9798350388947

Electromagnetic potential transformer(PT) may undergo ferroresonance when subjected to external disturbances, which causes overvoltage and affects the stable operation of the power system. In order to provide reference advice for the installation and monitoring of the sensor, the temperature field of 10kV electromagnetic PT was simulated by utilizing the finite element method. In this paper, after establishing a three-dimensional model, joule loss, eddy current loss and hysteresis loss were calculated as heat sources, and then the temperature field distribution was simulated. Subsequently, the differences before and after the ferroresonance were compared to analyse the influence of the ferro resonance and inferred the location where the abnormal temperature rise occurs. The simulation results showed that the highest temperature of the shell is located at the side closest to the heat source, where the epoxy resin is the thinnest and most sensitive to temperature changes. Therefore, the temperature sensor should be mounted at this location, where the abnormal temperature rise can be detected quickly. This study not only will provide suggestions for the installation and monitoring of sensors, but also will lay a foundation for the realization of the 'self-healing' function of the robust smart grid, and improve the reliability and security of the grid operation. © 2024 IEEE.

关键词： Electric power transmission networks

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