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Study of the Effect of Harmonics and Stress on the Integrated Magnetic Properties of Oriented Silicon Steel Sheets

Progress In Electromagnetics Research B 2023年 102卷 171-187页

作者： Luo, Hanwu Hu, Xingyu Li, Fang Luo, Ao Li, Wenzhen Qin, Ruofeng Yang, Fan State Grid East Inner Mongolia Electric Power Company Tongliao028000 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chong-Qing400044 China

The core structure of transformers and reactors is subject to stress and high-frequency excitation during operation. The core structure is made of laminated silicon steel sheets, which are subject to magnetostrictive strain under alternating magnetic fields. To investigate the comprehensive magnetic properties of oriented silicon steel sheets under the in uence of harmonics and stress, this paper builds a magnetic property measurement system for electrical steel and investigates the magnetization and magnetostriction characteristics of oriented silicon steel sheets of type 30SQGD105 under working frequency, harmonic and applied stress conditions. The results show that the effects of harmonics and stress on the hysteresis characteristics of the silicon steel sheet are small, and the effects on the magnetostriction characteristics are large. © (2023). All Rights Reserved.

关键词： Magnetostriction

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power Loss Assessment of Three-Level Neutral-Point-Clamped Inverter With DPWM Modulation 6

Power Loss Assessment of Three-Level Neutral-Point-Clamped I...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Luo, Ming Zou, Mingrui Niu, Fuli Liang, Yuxi Sun, Peng Zeng, Zheng Chongqing University State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing China

ISBN: (纸本)9798350346671

The three-level neutral-point-clamped (3L NPC) inverter is widely employed for the renewable energy application. To achieve lower life cycle cost, the efficiency of 3L NPC inverter is highlighted. Compared to the continuous PWM (CPWM) modulation, the discontinuous PWM (DPWM) modulation is preferred to reduce switching and conduction losses. Nevertheless, the power loss assessment of the DPWM modulation is a remaining challenge for the 3L NPC inverter. In this paper, the general mathematical model of the DPWM modulations is created to quantify the power loss of the 3L NPC inverter. The duty cycles of the power device are modeled for the unipolar and bipolar CPWM modulations, even for the DPWM modulations of the 3L NPC inverter. Moreover, the switching and conduction losses of the 3L NPC inverter are analyzed, considering different CPWM and DPWM modulations. The experimental test rig and switching trajectory are presented to observe the specific loss of the commercial 3L NPC power module. Besides, comprehensive comparisons of the power loss dependent on PWM modulation are demonstrated for the 3L NPC inverter. It is found that the theoretical predictions of the proposed model are consistent with the simulated results of the PLCES tool. Due to the optimal power loss, the DPWM1 is recommended for the 3L NPC inverter application. The methodologies and findings in this paper are also helpful for the 3L T-type NPC (TNPC) and active NPC (ANPC) inverter application. © 2023 IEEE.

关键词： Pulse width modulation

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Interaction Mechanism Analysis and Synchronization Stability Control for Paralleled PLL-VSCs system during LVRT

Interaction Mechanism Analysis and Synchronization Stability...

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2023 IEEE International Conference on power Science and technology, ICPST 2023

作者： Huang, Sen Yao, Jun Lin, Yongchao Luo, Yi Chongqing University State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing China

ISBN: (纸本)9798350311358

Due to the weak immunity of power electronic devices, the phase-locked loop-synchronized voltage source converters (PLL-VSCs) face severe transient instability risk during low voltage ride through (LVRT). Unlike the existing research, this paper takes a paralleled PLL-VSCs system as the study object and discusses the interaction mechanism between the PLL-VSCs. It is found that the interaction between PLL-VSCs is determined by the mutual-impedance voltage drop, which is mainly affected by different current injection angles during LVRT. And then, in order to ensure the best transient stability of the paralleled system, a current optimization control strategy is proposed. Finally, the correctness of the theoretical analysis and the effectiveness of the proposed strategy are validated by simulations. © 2023 IEEE.

关键词： Transients

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Tuning the ONOOH of plasma-activated water: Effect of the N2/O2 ratio and post-discharge duration 6

Tuning the ONOOH of plasma-activated water: Effect of the N2...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Ran, Congfu Liu, Kun Chongqing University The State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing China

ISBN: (纸本)9798350346671

Plasma activated water (PAW) contains a variety of reactive oxygen and nitrogen species (RONS). Among them, ONOOH has an impact on the activity and function of cells in the biological system, and also has a pharmacological inhibitory on many human diseases. However, since ONOOH in PAW is a transient species that is difficult to determine, most of the current research is still mainly focused on its determination or basic applications. There is no in-depth study and discussion on its regulation mechanism. Therefore, this research mainly investigates the two aspects mentioned above. In this study, the dielectric barrier discharge (DBD) is used to treat phosphate buffer solution (PBS) for preparing PAW. The effect of different gas ratios of N2 to O2 on the product characteristics and the lifetime of ONOOH with its precursors is studied, and the pH value of the solution is also tested. The result shows that the maximum yield of ONOOH is at a gas ratio of N2:02=6:4. Then, PAW prepared under different conditions is preserved, in which the products are detected on the different periods. The result shows that the concentration of ONOOH rises briefly after the treatment with the gas ratio of N2:02= 9:1, 8:2 and 7:3, which indicates that the generation of ONOOH can be more than the consumption under these conditions at 0-15 minutes. © 2023 IEEE.

关键词： Dielectric materials

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Motion Characteristics of Control Rod Drive Mechanism Based on Correction of Electromagnetic Force Calculation Deviation 17th

Motion Characteristics of Control Rod Drive Mechanism Based ...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Qian, Wang Qiwei, Xu Yun, Yang Yangming, Chen Shaolin, Li Sheng, Liu State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9789819904501

With the rapid development of advanced technologies such as digital prototype of the Control Rod Drive Mechanism, it is necessary to simulate the operation process of the Drive Mechanism in real time, which needs to be realized based on the mathematical model of the electromagnetic force. The electromagnetic force formula of the Drive Mechanism derived from Maxwell’s suction formula has the problems of inaccurate calculation results, so a deviation correction method for electromagnetic force calculation is proposed. Taking the transient electromagnetic field simulation results of the Finite Element Method as the optimization objective, the parameter of the fixed reluctance value in the mathematical model of the electromagnetic force is modified by the Least Square Fitting Method. The corrected electromagnetic force error is reduced from 30.0% to 1.2%. A multi physical field kinematics simulation model is built based on MATLAB/Simulink software to obtain the force and motion state of the lift armature. Compared with the traditional finite element simulation method combined with multiple software, the proposed scheme not only ensures the calculation accuracy, but also greatly improves the calculation speed. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： MATLAB

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Voltage Optimization Considering Integrated Photovoltaic 5G Base Station for ADNs 5

Voltage Optimization Considering Integrated Photovoltaic 5G ...

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5th International Conference on power and Energy technology, ICPET 2023

作者： Zhou, Yiyao Wang, Qianggang Chi, Yuan Xu, Xiaolong Zhang, Xuefei Zhou, Niancheng Chongqing University State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing China

ISBN: (纸本)9798350339673

The voltage problem of active distribution networks (ADNs) is becoming more and more severe with the increase of the proportion for distributed energy resources (DERs) and new loads. This paper considers integrated photovoltaic (PVs) 5G base station (5G BS) as an emerging flexibility resource and uses it to optimize the voltage of ADNs. First, the voltage regulation potential of backup batteries and PVs in 5G BS is analyzed and evaluated. Then, a voltage optimization model of ADNs considering integrated PV 5G BS is established. This model is an integer second-order cone programming (MISOCP) problem, which can be easily solved by commercial software. Finally, an actual ADN is used to verify the effectiveness of the integrated PV 5G BS to participate in voltage optimization. © 2023 IEEE.

关键词： 5G base station active distribution networks voltage optimization voltage violation

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Investigation of Non-local Thermodynamic Equilibrium Effects of Medium Voltage AC Air Arc 4

Investigation of Non-local Thermodynamic Equilibrium Effects...

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4th IEEE International Conference on Electrical Materials and power equipment, ICEMPE 2023

作者： Zhou, Tong Yang, Qing Yuan, Tao Chongqing University State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing China

ISBN: (纸本)9798350334678

The medium-voltage (MV) power distribution networks have a complex topology, and this can easily cause air arc faults. However, the current of the air arc is low, and the arc temperature is only a few thousand Kelvin. In this case, the arc is in non-local thermodynamic equilibrium (non-LTE). The LTE state of arc is the basis for the establishment of arc model and the calculation of transport coefficient. In this paper, the non-LTE effect of the MV AC air arc is studied by the moiré deflection and the optical emission spectroscopy (OES) techniques. © 2023 IEEE.

关键词： Optical emission spectroscopy

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Mixed Aleatory-epistemic Uncertainty Modeling of Wind power Forecast Errors in Operation Reliability Evaluation of power systems

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Journal of Modern power systems and Clean Energy 2022年第5期10卷 1174-1183页

作者： Jinfeng Ding Kaigui Xie Bo Hu Changzheng Shao Tao Niu Chunyan Li Congcong Pan Powerand Energy Reliability Research Center State Key Laboratory of Power Transmission Equipment&System Security and New TechnologyChongqing UniversityChongqing400044China

As the share of wind power in power systems continues to increase, the limited predictability of wind power generation brings serious potential risks to power system reliability. Previous research works have generally described the uncertainty of wind power forecast errors(WPFEs) based on normal distribution or other standard distribution models, which only characterize the aleatory uncertainty. In fact, epistemic uncertainty in WPFE modeling due to limited data and knowledge should also be addressed. This paper proposes a multi-source information fusion method(MSIFM) to quantify WPFEs when considering both aleatory and epistemic uncertainties. An extended focal element(EFE) selection method based on the adequacy of historical data is developed to consider the characteristics of WPFEs. Two supplementary expert information sources are modeled to improve the accuracy in the case of insufficient historical data. An operation reliability evaluation technique is also developed considering the proposed WPFE model. Finally,a double-layer Monte Carlo simulation method is introduced to generate a time-series output of the wind power. The effectiveness and accuracy of the proposed MSIFM are demonstrated through simulation results.

关键词： Wind power forecast error(WPFE) epistemic uncertainty multi-source information fusion method(MSIFM) operation reliability extended focal element(EFE) double-layer Monte Carlo simulation

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A Defense Planning Model for a power system Against Coordinated Cyber-physical Attack

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Protection and Control of Modern power systems 2024年第5期9卷 84-95页

作者： Peiyun Li Jian Fu Kaigui Xie Bo Hu Yu Wang Changzheng Shao Yue Sun Wei Huang State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044China State Grid Chengdu Power Supply Com-pany State Grid Sichuan Electric Power Co.Ltd.Chengdu 610041China China Yangtze Power Co. LtdYichang 443002China

This paper proposes a tri-level defense planning model to defend a power system against a coor-dinated cyber-physical attack(CCPA).The defense plan considers not only the standalone physical attack or the cyber attack,but also coordinated *** defense strategy adopts coordinated generation and transmission expansion planning to defend against the *** the process of modeling,the upper-level plan represents the perspective of the planner,aiming to minimize the critical load shedding of the planning system after the *** load resources available to planners are extended to flex-ible loads and critical *** middle-level plan is from the viewpoint of the attacker,and aims at generating an optimal CCPA scheme in the light of the planning strategy determined by the upper-level plan to maximize the load shedding caused by the *** optimal operational behavior of the operator is described by the lower-level plan,which minimizes the load shedding by defending against the *** tri-level model is analyzed by the column and constraint generation algorithm,which decomposes the defense model into a master problem and *** studies on a modified IEEE RTS-79 system are performed to demonstrate the economic effi-ciency of the proposed model.

关键词： Coordinated cyber-physical attack flexible load column-and-constraint generation defense planning robust optimization.

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Revisit power system dispatch:Concepts,models,and solutions

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iEnergy 2023年第1期2卷 43-62页

作者： Zhifang Yang Pei Yong Mingxu Xiang State Key Laboratory of Power Transmission Equipment&System Security and New Technology College of Electrical EngineeringChongqing UniversityChongqing 400044China State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

power system dispatch is a general concept with a wide range of *** is a special category of optimization problems that determine the operation pattern of the power system,resulting in a huge influence on the power system security,efficiency,and *** this paper,the power system dispatch problem is revisited from the *** paper provides a categorization of the dispatch problem,especially with an emphasis on industrial ***,this paper presents a detailed review of the dispatch *** common formulations of the dispatch problem are ***,this paper discusses the solutions of the dispatch problem and lists the major challenges.

关键词： power system dispatch optimal power flow unit commitment energy storage

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