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26th International Conference on Electrical Machines and systems, ICEMS 2023

作者： Zhao, Jinglin Li, Hui Xiang, Xuewei Li, Wendong Chongqing University State Key Laboratory of Power Transmission Equipment & System Security and New Technology School of Electrical Engineering Chongqing China

ISBN: (纸本)9798350317589

This paper proposes control strategies for startup and emergency braking procedures of Doubly-Fed InductionMachine-Based Flywheel Energy Storage system (DFIM-FESS). For startup procedure, short-circuit the stator and simplify the stator Flux Oriented Control (FOC) by ignoring the transient part of the voltage equation based on flywheel characteristics, then perform the rotor currents control can output large electromagnetic torque and increasing speed stably. For emergency braking procedure, the rotor is two-phase short-circuited connect to DC source, the stator is connected to the braking resistance, then analyze the constraint conditions of the system, and propose the method to get the suitable parameters of the brake resistance and the DC excitation resource. The simulation results verify the effectiveness of the control strategies and configuration method of equipment parameters. © 2023 IEEE.

关键词： Flywheels

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An energy-saving pulsed magnetic field generator with multi-stage adjustable magnetic field change rate

An energy-saving pulsed magnetic field generator with multi-...

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2023 IEEE Pulsed power Conference, PPC 2023

作者： Lei, Yuan Liang, Runze Feng, Yiwei Dong, Shoulong Yao, Chenguo State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Shapingba District Chongqing400044 China

ISBN: (纸本)9798350332339

The pulsed magnetic field generator can be used in transcranial magnetic stimulation and tumour therapy, etc. In order to further optimize the output performance of the conventional pulsed magnetic field generator, this paper proposes an energy-saving pulsed magnetic field generator based on Marx, the energy efficient pulse source (EEPS) with an energy-feedback circuit structure, which can be used to achieve the recovery of the energy at the load end by means of commutation, to be conducive to the energy-saving of the system and a high-frequency-heavy output. In addition, the magnetic field change rate of the generator output can be flexibly adjusted through the cascade of discharge modules combined with the control of the switch on-time sequence of each level to achieve the adjustment of the output waveform. the adjustment of the pulsed magnetic field duration and the operating frequency can be achieved through the switch on-time and the switching frequency. In order to analyse the output performance of the generator and the energy recovery efficiency of the system, we constructed a two-stage EEPS platform and selected a multi-turn solenoid coil, which is commonly used in biomedical applications, to carry out the study. we tested the topology's ability to regulate the rate of change of the magnetic field by outputting pulsed magnetic fields in the form of triangular waveforms and exponential waveforms, and achieved a maximum of four levels of adjustability of the rate of change of the magnetic field, as well as the generation of pulsed magnetic field of amplitude as high as 1 T in the target location. magnetic field at the target location. The energy saving rate and self-loss rate of the system were measured based on the triangular wave output mode, and we found that the energy recovery efficiency of the system gradually increased with the increase of current. Therefore, the EEPS shows great potential for application in areas such as magnetic piercing and transcran

关键词： Magnetic fields

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Analysis of Vibration Characteristics of Mechanical Defects in GIS Three-Position Switch Travel not in Place Based on Multi-point Information 18th

Analysis of Vibration Characteristics of Mechanical Defects ...

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Liu, Qingsong Hao, Jian Peng, Huadong Zhong, Yao Shao, Ziqi Li, Xu State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China Chongqing Electric Power Research Institute State Grid Chongqing Electric Power Company Chongqing China

ISBN: (纸本)9789819714193

Mechanical defects in the travel of three-position switches not in place are an important factor in the failure of GIS equipment and a serious threat to grid security. In order to realise the effective operation and maintenance of mechanical defects in three-position switch travel, this paper builds a simulation platform for mechanical defects in travel using real three-position switches, studies the vibration law of the three-position switch breaking and closing action process under normal and energy resistance defects, and carries out a comparative analysis of the vibration characteristics and vibration parameters of three-position switches in different states with multiple measurement points in the time/frequency domain. The results show that: the vibration signal amplitude is related to the distance between the location of the measurement point and the location where the defect occurs;the normal three-position switch operates smoothly and has weak vibration amplitude and light pulses, while the impact tooth effect caused by the energy resistance defect produces a cyclic shock vibration signal with stronger vibration amplitude and longer transient action time;the absolute mean value of vibration in the time domain and the energy value in the frequency domain of the three-position switch defect are significantly greater than the normal state, based on which the qualitative determination of the presence or absence of defects can be effectively achieved. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Vibration analysis

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A Voltage-current Hybrid Control Scheme to Improve the Output Currents Quality of Virtual Synchronous Generators under Distorted Grid Voltages 11

A Voltage-current Hybrid Control Scheme to Improve the Outpu...

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11th International Conference on power Electronics - ECCE Asia, ICPE 2023-ECCE Asia

作者： Yang, Bo Du, Mingjian Liu, Hao Xu, Song Lu, Shuai Chongqing University School of Electrical Engineering State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing China

ISBN: (纸本)9788957083505

When the virtual synchronous generator (VSG) works in a grid with distorted voltages, it is difficult to guarantee the quality of its output currents. The existing harmonic suppression schemes are limited in various aspects. In this paper, a new voltage-current hybrid control (VCHC) scheme is proposed. At the fundamental frequency, VCHC is equivalent to voltage control to follow the fundamental voltage command from the VSG power control loop. VCHC is equivalent to current control at harmonic frequencies, which can suppress harmonic currents introduced by distorted grid voltages. Compared to existing methods, VCHC can greatly improve the output current quality of VSG without adding additional sensors or inductors. Finally, a 15kW experimental prototype was built and the experimental results verified the effectiveness of VCHC. © 2023 The Korean Institute of power Electronics.

关键词： power quality

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Non-destructive method by nonlinear ultrasonic measurements for aging characterization of silicone rubber 6

Non-destructive method by nonlinear ultrasonic measurements ...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Qiu, Yonglin Wang, Hanqing Cheng, Li Yang, Lijun Liao, Ruijin School of Electrical Engineering Chongqing University State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing China

ISBN: (纸本)9798350346671

Silicone rubber has been widely applicated in the electrical field, especially used as insulation materials, due to its excellent physical properties. However, the performance of silicone rubber will decline with its aging process leaded by plenty of factors. There's lack of methods for overall nondestructive characterization of the aging degree of silicone rubber in use presently. In this paper, the thermal aging experiment of silicone rubber is designed, and the nonlinear coefficient of the sample is measured by nonlinear ultrasonic method during the aging process, the change of the nonlinear coefficient of the sample during the aging process is analyzed, the rule of thermal aging of silicone rubber is summarized, and the feasibility of using the nonlinear coefficient as the aging characterization of silicone rubber is discussed. © 2023 IEEE.

关键词： Nondestructive examination

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Implementation of Digital Twin Modeling for Valve Side Bushing Based on on-Site Operational Data and Model Driven Concept

Implementation of Digital Twin Modeling for Valve Side Bushi...

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2024 International Conference Optoelectronic Information and Optical Engineering, OIOE 2024

作者： Zhang, Shiling Wang, Pengbo He, Yongsheng Dai, Liangjun State Grid Chongqing Electric Power Company Chongqing Electric Power Research Institute Chongqing401123 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China

ISBN: (数字)9781510688209

ISBN: (纸本)9781510688193

This article is based on the physical field model with multiple physical field mechanisms, which enables the digital twin model to accurately simulate the behavior of physical objects. The driving model based on the reduced order algorithm enables the digital twin model to have good interaction and exploration of physical object mechanisms while ensuring computational accuracy. The visualization model enables the digital twin model to display the internal structure and state of physical objects in a detailed and intuitive manner. Grid data is the finite element mesh parameters obtained by finite element meshing of the bushing geometric model. Each node in the grid data not only participates in the calculation of the multi physical field of the valve side bushing, but also interfaces with the visualization model as the rendering basis for the visualization of valve side bushing. Therefore, constructing grid data requires grid node data and grid rendering data. The grid node data is stored in NAS (BDF) file format, and the grid rendering data is stored in STL file format. © 2025 SPIE.

关键词： Digital elevation model

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10.7kV nanosecond pulse generator based on pulse forming line and variable impedance transmission line transformer

10.7kV nanosecond pulse generator based on pulse forming lin...

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2023 IEEE Pulsed power Conference, PPC 2023

作者： Ma, Jiuxin Ren, Lvheng Yu, Liang Yao, Chenguo Dong, Shoulong State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Shapingba District Chongqing400044 China

ISBN: (纸本)9798350332339

Low-temperature atmospheric pressure plasma has important application value in the fields of material surface modification, waste gas and wastewater treatment, sterilization and disinfection. High voltage nanosecond pulse with rapid rise time can provide a higher constrained electric field, which could quickly ionize the gas and make the electrons quickly obtain higher kinetic energy. Higher density of free electrons and stronger chemically active substances will produce. Therefore, the high voltage nanosecond pulse generator is an efficient plasma excitation source with wide prospects. This paper proposes a 10. 7kV nanosecond pulse generator based on pulse forming line and variable impedance transmission line transformer(VITLT). The proposed pulse generator uses the inductance in the transmission line as the energy storage unit. The magnetic energy stored in the transmission line is released by MOSFET with a fast turn off speed to form nanosecond pulse. An interesting fact is that a variable impedance transmission line transformer is applied to multiply the output voltage of single module circuit. In addition, it can achieve modular pulse superposition through transmission line time isolation method to generate high voltage output. Finally, this paper carried out experimental research. The experiment results of single module circuit show that VITLT can achieve multiple increase of voltage amplitude. The output pulse amplitude of single module is 2kV, and the pulse width is 12 ns. A 7-stage multi-module stacker was built which can produce a high-voltage nanosecond pulse output with voltage amplitude of 10.7 kV, pulse width of 15 ns and repetition frequency of 200 kHz. © 2023 IEEE.

关键词： Electric lines

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power Flow Model for Medium-voltage distribution systems Considering Measurement and Structure Characteristics

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Journal of Modern power systems and Clean Energy 2024年第2期12卷 571-583页

作者： Zhengmei Lu Wei Yan Dezhi Huang Junjie Tang Ferdinanda Ponci Antonello Monti State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044China State Grid Zhejiang Yiwu Power Supply Company State Grid Zhejiang Electric Power CompanyYiwu 322001China Institute for Automation of Complex Power Systems of the E.ON Energy Research Center at RWTH Aachen University Aachen52074Germany Digital Energy Fraunhofer FIT Aachen52072Germany IEEE

Medium-voltage distribution systems(MVDSs)mainly consist of a feeder head,lines,distribution transformers,and the equivalent load or power supply interfaced with the distribution *** information of such load or power supply can be measured via the three-wattmeter method(THM)and the two-wattmeter method(TWM).The measurements can be used to perform the control of the power supply and simulate the characteristics of the load,so the models of the load and the power supply need to consider the measurement *** research works on three-phase power flow(PF)just consider the measurement characteristics of ***,the PF equation of the bus measured via TWM is firstly *** on conventional measurements,an accurate and general model of the grounded and ungrounded slack bus is ***,the influence arising from the connection type and angle shift of distribution transformers on the admittance matrix is considered,and thus a general three-phase transformer model is summarized,which is applicable for all the transformers mentioned ***,newton's method is adopted to solve the PF calculation,and the performance of the proposed PF model is demonstrated through designed tests.

关键词： Medium-voltage distribution system three-phase power flow calculation measurement characteristic slack bus modeling distribution transformer

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Inverse Proportion Technique Based Scheduling Strategy for Energy Storage system Considering Load Demand Differences

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CSEE Journal of power and Energy systems 2022年第5期8卷 1487-1496页

作者： Hejun Yang Zhenyu Hao Yinghao Ma Dabo Zhang Anhui Provincial Key Laboratory of Renewable Energy Utilization and Energy Saving Hefei University of TechnologyHefei 230009China State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044Chin

The energy storage system(ESS)as a demand-side management(DSM)resource can effectively smooth the load power fluctuation of a power ***,designing a more reasonable ESS operational strategy will be a prerequisite before incorporating the energy storage device into *** different load levels have different demands for the real-time chargedischarge power of an ESS,this paper proposes a heuristic ESS operation scheduling strategy which can take into account the electrical load demand *** this paper,firstly,two demand degree concepts for charging power and discharging power are defined to describe the differentiated ESS demand under the condition of different electrical load ***,an inverse proportion technique based ESS scheduling strategy,with the consideration of the load demand difference,is proposed in this ***,some evaluating indices are defined in this paper for describing the influence of the proposed strategy on the smoothing degree of the daily load ***,several case studies are designed to verify the validity and correctness of the proposed technique,and the results show that the proposed technique can effectively smooth the load curve and improve the ability of peak shaving and valley filling.

关键词： Demand response energy storage system load demand difference operation scheduling strategy peak shaving and valley filling

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Energy Storage Planning and Configuration of Active distribution Network Based on Load Ordered Clustering

Energy Storage Planning and Configuration of Active Distribu...

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2023 IEEE International Conference on Advanced power system Automation and Protection, APAP 2023

作者： Du, Xiangyang Cheng, Junjie Xiong, Xiaofu Xue, Meijia Ni, Yang Chongqing University State Key Lab. of Power Transmission and Distribution Equipment and System Safety and New Technology Chongqing China

ISBN: (纸本)9798350306668

In order to fully excavate scheduling, periodic characteristics of power load, raise the reliability and economy of the energy storage and distribution network planning, based on the year of the three typical load curves, on the basis of similarity analysis, through the orderly clustering analysis. distribution network planning, based on the year of the three typical load curves, on the basis of similarity analysis, through the orderly clustering method for all kinds of load curves according to the time series of annual finer clustering, and the time series of annual finer clustering. method for all kinds of load curves according to the time series of annual finer clustering, The minimum time unit of dynamic configuration of mobile The minimum time unit of dynamic configuration of mobile energy storage in distribution network is planned according to month, and a method of energy storage planning and configuration of active distribution network based on load ordered clustering. The minimum time unit of dynamic configuration of mobile energy storage in distribution network is planned according to month, and a method of energy storage planning and configuration of active distribution network based on load ordered clustering is proposed. Finally, IEEE33 node system is adopted to verify the proposed scheme. The calculation results show that the energy storage configuration scheme considering the actual time sequence characteristics of the load is more economical and can reflect the actual operation of the distribution network. The calculation results show that the energy storage configuration scheme considering the actual time sequence characteristics of the load is more economical and can reflect the actual operation of the distribution network. The scheme is an effective extension of the flexible use of energy storage equipment in the distribution network, and can better serve the variable operation of active distribution network load, so as to better play the role of

关键词： Electric power distribution

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