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作者： Ye He Binjiang Hu Dongxu Chang Jie Zhang Lingfang Li Yixuan Chen Power Planning and Research Center Yunnan Power Grid Co. Ltd. State Key Laboratory of HVDC Electric Power Research InstituteChina Southern Power Grid Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research InstituteChina Southern Power Grid

A unified specification to design and operate the stability control device in smart substation has not been formed yet, which has greatly affected the promotion and application of stability control device in smart substation. Thus, referring to the technical specifications of protection device and combining to the specificity of stability control device, a full and detailed configuration scheme is proposed to meet the requirement, including the device configuration principle, the access configuration of SV and GOOSE for variable primary connection types,the virtual terminal and soft switch. This solution is beneficial to standardize the R＆D of stability control device in smart substation, and to facilitate on-site debugging, operation and maintenance.

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Physical Passivation of Deep-Level Defect states in Polymer Dielectrics for Outstanding Dielectric Properties

SSRN

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SSRN 2023年

作者： Li, Xiao-Fen Wang, Tian-Yu Yin, Si-Jia Zhang, Gui-Xin Liu, Jian-Bo Liu, Bai-Xin School of Materials Science and Engineering Tsinghua University Beijing100084 China State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100084 China College of Art and Design Visual Communication Design SuZhou University Suzhou234111 China

The limited dielectric strength of polymer dielectrics hampers their reliable use in highly integrated electrical systems and high-energy storage film capacitors. This constraint is closely associated with the presence of deep-level defect states in polymer dielectrics. Here, we present an efficient and stable approach for the physical passivation of deep-level defect states aimed at enhancing the dielectric properties of polymer dielectrics. Employing inductively coupled plasma technology with argon as the carrier gas, the polymer undergoes substantial decreased deep-level defect states, as evidenced by nano-micro-region defect measurements. Consequently, the localized charge accumulation in the treated polymer dielectric is significantly reduced, resulting in a remarkable 62% increase in flashover voltage. The breakdown strength is also enhanced, and the treated material exhibits long-term stability. Moreover, materials featuring passivated deep-level defect states can boost discharge energy density without compromising efficiency. For instance, PTFE with passivated deep-level defect states maintains a discharge energy density of 1.18 J/cm3 and a charge-discharge efficiency of 95.06% at 200 °C and 300 MV/m. By focusing on deep-level defect states passivation, we introduce a strategy for receiving polymers with exceptional performance and stability. © 2023, The Authors. All rights reserved.

关键词： Passivation

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Introduction to the Special Issue on Novel Methods of Topology Optimization and Engineering Applications

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Computer Modeling in Engineering & Sciences 2022年第4期131卷 27-29页

作者： Kai Long Xiaodong Huang Zunyi Duan Xuan Wang Quhao Li State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric PowerUniversityBeijing102206China School of Engineering Swinburne University of TechnologyHawthornVIC 3122Australia Institute of Structural Health Monitoring and Control School of MechanicsCivil Engineering&ArchitectureNorthwestern Polytechnical UniversityXi’an710072China Department of Engineering Mechanics Hefei University of TechnologyHefei230009China Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE School of Mechanical EngineeringShandong UniversityJinan250061China

Topology optimization,aiming to allocate the available material to maximize system performance while satisfying multiple constraints,has experienced tremendous *** special issue focuses on the new progress of topology optimization methods and their applications,especially theoretical development,numerical implementation and potential applications.

关键词： optimization satisfying constraints

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Formulation of Fault Characteristics Based on Model Reduction in High Penetration Electronics system

Formulation of Fault Characteristics Based on Model Reductio...

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IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Jiyao Han Zhuan Zhou Qichao Chen Fei Wang Xiaohui Wang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education School of Electrical Engineering Shandong University Jinan China State Grid Xinjiang Electric Power Co. Ltd Urumqi China State Grid Economic and Technological Research Institute CO. Ltd State Grid Corporation of China Bejing China

In the power grid, with the extensive applications of power electronic equipment, the dimension and complexity of the power system model are greatly increased. Compared with the traditional power grid, the number of components in the high proportion electronic power grid system is large and the interactions between them are complex. In case of fault, it is necessary to comprehensively consider state variables. To solve the above problems, a fault feature extraction method based on balanced truncation model reduction algorithm is proposed, and the feasibility of the fault feature extraction is verified by time-domain simulation in a photovoltaic grid connected system model. This method aims to recombine the original variables into a group of new independent comprehensive variables, and then take out a few comprehensive variables according to the actual needs to reflect the fault information in the original system as much as possible.

关键词： Linear systems Photovoltaic systems Electrical engineering Spontaneous emission Feature extraction Reduced order systems power grids

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Analysis of the influence of wind farms in full operating conditions on the torsional vibration of the shaft system of synchronous generators

Analysis of the influence of wind farms in full operating co...

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International Conference on power system Technology (powerCON)

作者： Qi Jia Wenchao Zhai Qiang Zhang Feng Sun Mohan Shen State Grid Liaoning Electric Power Research Institute Shenyang China Ministry of Education Key Laboratory of Modern Power System Simulation Control and Green Power Technology Northeast Electric Power University Jilin China

ISBN: (纸本)9781665407380

The power oscillation induced by the large-scale integration of wind power into the power grid has become one of the important issues affecting the safe and stable operation of the power grid. Aiming at the dynamic interaction between wind farms and synchronous generators, based on the additional excitation signal injection method, the influence of DFIG and PMSG wind farms on the damping characteristics of each torsional vibration mode of synchronous generators under full operating conditions is analyzed. By applying an AC voltage signal at both ends of the field winding to stimulate rotational speed oscillation, observe the difference in the free response characteristics of rotational speed disturbances, identify the electromechanical coupling characteristics between the wind farm and the synchronous generator set, and reveal the influence of the wind farm type and operating conditions on the shaft system of the synchronous generator set. The mechanism of torsional vibration. Finally, the validity of the theoretical analysis is verified based on time-domain simulation.

关键词： Vibrations Damping Shafts Fans Wind speed power system dynamics Wind farms

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Transition Metal (AU, Ag, Pt, Pd, Ni) Doped MoS2 as Gas Sensing Materials for C4F7n Leakage Detection: A Comparative Study

SSRN

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SSRN 2023年

作者： Yan, Yongxu Li, Yi Zhang, YiFan Wu, Peng Tang, Ju Zhang, Xiaoxing Xiao, Song State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and Automation Wuhan University Wuhan China Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of Technology Wuhan430068 China

Fluorinated nitrile (C4F7N) has been considered a novel eco-friendly gas insulating medium, while the low toxicity and leakage risk urgently urge the development of C4F7N gas sensor. Herein, we analyzed the sensing performance of transition metal doped MoS2 to C4F7N based on the density functional theory (DFT). The adsorption energy, charge transfer, deformation charge density and density of states were explored. Furthermore, the sensitivity and recovery performance were analyzed based on frontier orbital and transition state theories. It was found that Pd-MoS2 can achieve a superior balance between sensitivity and response time, showing promising potential for C4F7N leak detection for engineering applications. © 2023, The Authors. All rights reserved.

关键词： Density functional theory

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Research on Energy Storage Capacity Configuration Method and Performance Evaluation in New Energy Base

Research on Energy Storage Capacity Configuration Method and...

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power and Electrical Technology Conference (APET), Asia

作者： Ruoyu Zhang Liangyou Wang Changping Sun Bo Le Mian Wang Kangsheng Cui Institute of Science and Technology China Three Gorges Corporation Beijing P.R. China State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing P.R. China

In order to improve the power output stability and frequency stability when large-scale new energy is integrated into the grid, large-scale new energy base must consider the configuration of energy storage systems with a certain capacity. Facing the demand under the background of new energy development, this paper analyzes the positive impact of energy storage to new energy base. The configuration method of energy storage capacity is proposed, and furthermore, the proposed method is used to calculate the capacity of the energy storage system required to be configured in a typical new energy base, and the power suppression and stability improvement effects brought by the energy storage are evaluated. The case analysis results show that the required energy storage capacity of a new energy base is about 10% of its total wind power and photovoltaic capacity. This configuration ratio can basically achieve the stability of the new energy output fluctuation, and at the same time provides the same frequency regulation capability with conventional generator set of equal capacity.

关键词： Performance evaluation Technical requirements Photovoltaic systems Fluctuations power system stability Wind power generation Stability analysis

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Microscopic characteristics of SF6partial discharge induced by a floating linear metal particle

arXiv

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arXiv 2024年

作者： Feng, Zihao Jiang, Yuanyuan Zhang, Liyang Liu, Zhigang Wang, Kai Wang, Xinxin Zou, Xiaobing Luo, Haiyun Fu, Yangyang Department of Electrical Engineering Tsinghua University Beijing100084 China Tsinghua Shenzhen International Graduate School Shengzhen Guangdong518055 China State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing100084 China

Direct current (DC) gas insulated transmission lines (GILs) have been widely used in power transmission, but might be threatened by partial discharge due to the presence of floating impurities (e.g., dust and metal particles) inside the sealed chamber. In this letter, by using a 2D fluid model we characterize the microscopic properties of the partial discharge induced by a floating linear metal particle in SF6(both the discharge propagation and interaction between space charge and metal particle) under negative high voltage direct current (HVDC) conditions. Due to the strong electronegativity of SF6, the spatiotemporal distributions of the charged species (electrons, positive and negative ions), space charge, and reduced electric field are rather different from those in air. Notably, a negative ion region is observed around the top tip of the metal particle, and it plays an important role in the generation and propagation of primary and secondary streamers in SF6, which may lead to severe motion characteristics of the particle and aliasing of partial discharge signals. Additionally, we analyze the charging process and electric force reversal phenomenon, which may provide a more precise understanding of the underlying mechanisms of the firefly motion previously reported for DC GILs. Copyright © 2024, The Authors. All rights reserved.

关键词： Negative ions

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Effects of phytohormone on Chlorella vulgaris grown in wastewater-flue gas: C/N/S fixation, wastewater treatment and metabolome analysis

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Chemosphere 2023年 345卷 140398页

作者： Kong, Wenwen Shi, Shilin Peng, Denghui Feng, Shuo Xu, Lianfei Wang, Xin Shen, Boxiong Bi, Yonghong Lyu, Honghong Tianjin Key Laboratory of Clean Energy and Pollution Control School of Energy and Environmental Engineering Hebei University of Technology Tianjin300401 China State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences Wuhan430072 China Hebei Engineering Research Center of Pollution Control in Power System Hebei University of Technology Tianjin300401 China

Chlorella vulgaris (C. vulgaris) can provide the means to fix CO2 from complicated flue gas, treat wastewater and reach a sustainable production of petrochemical substitutes simultaneously. However, a prerequisite to achieving this goal is to promote C. vulgaris growth and improve the CO2-to-fatty acids conversion efficiency under different conditions of flue gas and wastewater. Thus, the addition of indole-3-acetic acid (IAA) in C. vulgaris cultivation was proposed. Results showed that C. vulgaris were more easily inhibited by 100 ppm NO and 200 ppm SO2 under low nitrogen (N) condition. NO and SO2 decreased the carbon (C) fixation;but increased N and sulfur (S) fixation. IAA adjusted the content of superoxide dismutase (SOD) and malondialdehyde (MDA), improved the expression of psbA, rbcL, and accD, attenuated the toxicity of NO and SO2 on C. vulgaris, and ultimately improved cell growth (2014.64–2458.16 mgdw·L−1) and restored CO2 fixation rate (170.98–220.92 mg CO2·L−1·d−1). Moreover, wastewater was found to have a high treatment efficiency because C. vulgaris grew well in all treatments, and the maximal removal rates of both N and phosphorus (P) reached 100%. Metabonomic analysis showed that IAA, "NO and SO2" were involved in the down-regulated and up-regulated expression of multiple metabolites, such as fatty acids, amino acids, and carbohydrates. IAA was beneficial for improving lipid accumulation with 24584.21–27634.23 μg g−1, especially monounsaturated fatty acids (MUFAs) dominated by 16–18 C fatty acids, in C. vulgaris cells. It was concluded that IAA enhanced the CO2 fixation, fatty acids production of C. vulgaris and its nutrients removal rate. © 2023 Elsevier Ltd

关键词： Carbon dioxide

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Characteristics of the partial discharge in oil-paper cavity under the valve voltage waveform of converter transformer 3

Characteristics of the partial discharge in oil-paper cavity...

引用

3rd International Conference on Electrical Materials and power Equipment, ICEMPE 2021

作者： Sun, Weidong Yang, Lijun Xu, Zhiren Wei, Yiheng Ministry of Education College of Automation Chongqing University of Posts and Telecommunications Key Laboratory of Industrial Internet of Things and Networked Control Chongqing China Chongqing University State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing China

ISBN: (纸本)9781665418409

In this paper, the partial discharge (PD) in oil-paper insulation cavity is conducted under the voltage of AC,YΔ connection and Y/Y connection, respectively. The low-amplitude and high-repetition PD under the AC voltage is observed, the high-amplitude and a low-repetition PD is acquired under the given valve voltages. The discharge mainly occurs at the rising edge of the valve voltage waveforms. The Qmax of the discharge of YΔ and Y/Y connections is 2 and 2.5 times the Qmax under the AC voltage, respectively. The average discharge Qmean of Y/Δ and Y/Y connections is 3 and 2 times Qmean obtained under the AC voltage, respectively. The total discharge Qtatol of both valve voltage waveforms is higher than that under the AC voltage. The test results also show that the PD is severely affected by the voltage waveform as the voltage distortion is observed in the experiment. This work may provide a reference for the improvement of insulation design and the factory test of converter transformers. © 2021 IEEE.

关键词： Partial discharges

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