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5th International Youth Scientific and Technical Conference Relay Protection and Automation, RPA 2022

作者： Kutumov, Yu. D. Shadrikova, T.Yu. Shuin, V.A. Ivanovo State Power Engineering University Jsc so Ups Branch of Ido Center Automatic Control of Electrical Power Systems Department Ivanovo Russia

ISBN: (数字)9798350399912

ISBN: (纸本)9798350399912

At the present time approximately 20% of 6-10 kV cable networks operate with resonant-grounded via arc-suppression coil (ASC) neutral point [1]. Meanwhile, an increasing number of experts note that resonant grounding of neutral point via ASC cannot solve the issue of single phase to earth faults (SPEF) negative consequences and their most dangerous variation, which is called intermittent arc single phase to earth fault (IASPEF) [for example, 2]. The main reasons for the inadequate efficiency of this neutral grounding mode are higher harmonic components in steady-state SPEF current, as well as higher harmonic components which are due to intensive transient processes during SPEF, which cannot be compensates by the usage of ASC. For the compensation of these components it is necessary to apply the devices, which will be complement ASC;these devices, together with the ASC, can be called a system of full compensation of the SPEF current. © 2022 IEEE.

关键词： Electric grounding

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Development and Research of the Rogowsky Coil Design with Low Sensitivity to Conductor Displacement

Development and Research of the Rogowsky Coil Design with Lo...

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2022 International Ural Conference on Electrical power engineering, UralCon 2022

作者： Yablokov, Andrey Kabakov, Pavel Ivanovo State Power Engineering University Named after V.I. Lenin Department of Electric Power Systems Automatic Control Ivanovo Russia

ISBN: (数字)9781665466523

ISBN: (纸本)9781665466523

The Russian energy sector underwent significant changes at the end of the 20th and the beginning of the 21st century [1]. The rapid development of engineering and technology in Russia inevitably led to a constant increase in the power system capacity, which in turn led to an increase in the levels of short circuit (SC) currents. Under such conditions, the problems of ensuring static and dynamic stability, the development of automatic emergency control (AEC) systems and the creation of new types of relay protection and automation systems (RPA) have become priority issues for the development of the electric power industry [2]. In particular, recently one of the most important issues is the creation of more advanced current sensors based on non-traditional primary converters [3-7]. A huge breakthrough in solving the tasks was made thanks to the development of computer technology. Electromagnetic and static relays were replaced by microprocessor technologies, the main advantage of which is a high-resistance input, which allows to use previously inaccessible low-power devices. One of these devices is the Rogowski coil, which is one of the types of nontraditional primary current converters. The disadvantage of the split Rogowski coil is the dependence of the metrological characteristics of the transducer on the position of the conductor. This article is devoted to the development of methods for reducing this dependence. © 2022 IEEE.

关键词： Automation

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Distribution Characteristics and Health Risk Assessment of Antimony in Atmospheric Particulates in a Northern City of China

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Chemical Research in Chinese Universities 2023年第3期39卷 465-471页

作者： SHEN Yiwen ZHAO Hao ZHAO Changxian DONG Shuofei CAO Yuanming XIE Jiaojao LYU Meiling YUAN Chungang Hebei Key Lab of Power-plant Flue Gas Multi-pollutants Control Department of Environmental Science&EngineeringNorth China Electric Power UniversityBaoding071000P.R.China Key Laboratory of Resources and Environmental Systems Optimization Ministry of EducationCollege of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing102206P.R.China Agilent Technologies Co. Ltd.(China)Beijing100102P.R.China

Over the last several decades,scientists have established a wealth of evidence to demonstrate the risks posed to human health by toxic elements in atmospheric particulate matter(PM).Antimony(Sb),as one of ever ignored PM-bound heavy metals,attracts more and more attentions and has been regarded as one emerging air pollutant with the change of pollution sources of particulate *** study the distribution of Sb in PM with different particle sizes is of great practical significance for understanding its source and health *** this study,the size distributions of Sb in PM(PM_(2.5),PM_(10)and TSP)in different seasons were studied from July 2018 to May *** high concentration of PM-bound Sb was found and the health risk was *** was enriched in fine particles and showed higher values in winter,which was probably caused by coal combustion and meteorological *** was also found that traffic-related non-exhaust emissions might become another main contribution to fine particle *** risk assessment demonstrated that the hazard quotient(HQ)of Sb in PM_(2.5)and PM_(10)for children(PM_(2.5):1.54,PM_(10):1.32)exceeded the acceptable threshold and ingestion contributed the most to the HQ for both children and adults.

关键词： Particulate matter(PM) Antimony Size distribution Health risk

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Effect of Positive Temperature Coefficient Materials on the AC Breakdown Strength and Dielectric Properties of Epoxy Composites 4th

Effect of Positive Temperature Coefficient Materials on the ...

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4th International Symposium on Insulation and Discharge Computation for power Equipment, IDCOMPU 2023

作者： Teng, Chenyuan Li, Shuo Zhou, Yuanxiang Zhang, Ling Zhang, Yunxiao Huang, Meng College of Information Engineering Zhejiang University of Technology Hangzhou310023 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing102206 China

ISBN: (纸本)9789819974122

In operation, the negative temperature coefficient (NTC) electrical resistivity characteristics of polymeric insulating materials causes DC electric field distortion within power equipment insulation and lead to the failure. The doping of positive temperature coefficient (PTC) ceramic particles can suppress the NTC characteristics of the composites, but the electrical properties under AC voltages are unrevealed. In this paper, epoxy composites (0–20 wt%) doped with polydopamine-coated PTC particles were prepared, whose AC breakdown strength and dielectric properties were tested. The results shows that the decrease of AC dielectric strength is smaller than that under DC voltages after the doping PTC particles, and the coating of polydopamine can enhance the AC dielectric strength. As the doping content increases, the dielectric constant and tanδ of the epoxy composites increases, and the maximum increase of dielectric loss power is about 2% of the loss power caused by the current-carrying conductor. The research provides a theoretical basis for the optimization of the insulating performance of the equipment under the AC-DC composite voltages. © Beijing Paike Culture Commu. Co., Ltd 2024.

关键词： Epoxy resins

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Multi-Timescale Trading Strategy for Renewable power to Ammonia Virtual power Plant in the Electricity, Hydrogen, and Ammonia Markets

IEEE Transactions on Energy Markets, Policy and Regulation

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IEEE Transactions on Energy Markets, Policy and Regulation 2023年第4期1卷 322-335页

作者： Wu, Sirui Lin, Jin Li, Jiarong Liu, Feng Song, Yonghua Xu, Yanhui Cheng, Xiang Yu, Zhipeng Tsinghua University State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Beijing100087 China Tsinghua University Sichuan Energy Internet Research Institute Chengdu610213 China University of Macau Department of Electrical and Computer Engineering Macau999078 China Tsinghua University Department of Electrical Engineering Beijing100087 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China

Renewablepower to ammonia (RePtA) is a prominent zero-carbon pathway for decarbonization. Due to the imbalance between renewables and production energy demand, the RePtA system relies on electricity exchange with the power grid. Participating in the electricity market as a virtual power plant (VPP) may help to reduce energy costs. However, the power profile of local photovoltaics and wind turbines is similar to those in the market, resulting in rising energy costs under the conventional strategy. Hence, we develop a multi-timescale trading strategy for the RePtA VPP in the electricity, hydrogen, and ammonia markets. By utilizing the hydrogen and ammonia buffer systems, the RePtA VPP can optimally coordinate production planning. Moreover, we find it possible to describe the trading of electricity, ammonia, and hydrogen in a unified timeframe. The two-stage robust optimization model of the electricity market is extended to multiple markets and solved by the column and constraint generation (CC&G) algorithm. The case is derived from an actual project in the Inner Mongolia Autonomous Region. Sensitivity analysis demonstrates the economic advantages of the RePtA VPP joining multiple markets over the conventional strategy and reveals the necessity of the hydrogen and ammonia buffer and reactor flexibility. © 2023 IEEE.

关键词： Ammonia

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Analysis of the Findings of the Study of the Time to Saturation of Current Transformer Magnetic Circuits Located at Electric power Facilities

Analysis of the Findings of the Study of the Time to Saturat...

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International Ural Conference on Measurements (UralCon)

作者： Andrey Yablokov Anton Panashchatenko Department of Electric Power Systems Automatic Control Ivanovo State Power Engineering University “ISPU” Ivanovo Russian Federation

ISBN: (数字)9798350386028

ISBN: (纸本)9798350386035

Emergencies associated with incorrect operation of relay protection and automation (RPA) devices due to saturation of current transformers (CTs) can lead to great economic damage. The article presents an analysis of regulatory and technical documentation containing requirements for the quality of CT functioning in transient modes, statistical data on the results of calculations performed in accordance with the requirements of GOST R 58869–2019, as well as an analysis of the correctness of the assumptions introduced by it. To calculate the time to CTs saturation a special program was developed that automates the calculation methods, taking into account the assumptions focused on performing the manual calculations. The program takes into account the variation of the short circuit switching angle, the phase difference of the short circuit currents flowing through the branches feeding the short circuit point, the calculation of all CTs of a three-phase group with automatic selection of the worst result. The results obtained allow us to conclude about the relative number of CTs that do not meet the requirements of GOST R 58869–2019, the need to modernize existing methods and possible directions for such modernization. In addition, the article provides recommendations on the creation of automatic specialized software systems that can be used in the work of design, operating and research entities when they calculate the time to saturation of the CT magnetic circuits.

关键词： Current transformers Short-circuit currents Protective relaying Time measurement power grids Circuit faults Transient analysis Protection Magnetic circuits Fault currents

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A critical review on the technique and mechanism of microwave-based denitrification in flue gas

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Journal of Environmental Sciences 2022年第10期34卷 144-157页

作者： Bo Yuan Zhen Qian Zili Zhangc Le Fu Shihang Pan Runlong Hao Yi Zhao Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science and EngineeringNorth China Electric Power UniversityBaoding 071003China MOE Key Laboratory of Resources and Environmental Systems Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China Fujian Special Equipment Inspection and Research Institute FuzhouFujian 350008China

Microwave radiation has received extensive attention due to its significant thermal and nonthermal effects, and the development of MW-based denitrification in flue gas has become one of the most promising methods to avoid the defects of ammonia escape, high temperature and cost in traditional SCR. This review introduces the thermal and non-thermal effects of microwaves and divides MW-based denitrification methods into MW reduction and oxidation denitrification, systematically summarizes these denitrification methods, including MW discharge reduction, MW-induced catalytic reduction using active carbon, molecular sieves, metal oxides(transition metals, perovskites, etc.), MW-induced oxidation denitrification with and without additional oxidant, and discusses their removal pathway and mechanism. Finally, several research prospects and directions regarding the development of microwave-based denitrification methods are provided.

关键词： Microwave Denitrification Reduction Oxidation Radical

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Phase Segmentation of Ni/YSZ Anode for Solid Oxide Fuel Cells by Deep Learning

Phase Segmentation of Ni/YSZ Anode for Solid Oxide Fuel Cell...

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243rd ECS Meeting

作者： Wang, Y. Matsui, Y. Hosomizo, A. Kishimoto, M. Han, M. Iwai, H. Department of Mechanical Engineering and Science Kyoto University Nishikyo-ku Kyoto615-8540 Japan State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Energy and Power Engineering Tsinghua University Beijing100084 China

ISBN: (纸本)9781607685395

A deep learning network is implemented for the phase segmentation of Ni/YSZ anode of solid oxide fuel cells (SOFCs), as manual segmentation of focused ion beam-scanning electron microscopy (FIB-SEM) images is time-consuming. Segmentation is performed on two samples with different volume ratios of Ni to YSZ. The mean intersection over union (mIoU) reaches 0.9363, indicating good agreement between the predicted images and the manually segmented images. Furthermore, the impact of image augmentation on segmentation accuracy is investigated, and it is found that augmentation is necessary when the number of images in the training set is small or the training and testing sets come from different samples. Furthermore, mixing a sixth of manually segmented images from a new sample into the training set can significantly improve the accuracy of automated segmentation for the new sample. This strategy reduces the number of images requiring manual segmentation and improves processing efficiency. © The Electrochemical Society.

关键词： Solid oxide fuel cells (SOFC)

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Experimental Verification of Grid Inverter Operation in Urban Environment 11

Experimental Verification of Grid Inverter Operation in Urba...

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11th International Conference on Electrical, Electronic and Computing engineering, IcETRAN 2024

作者： Petronijević, Milutin Radonjić, Ivana Veselić, Boban Dimitrijević, Marko Milosavljević, Ćedomir Pantić, Lana University of Niš Faculty of Electronic Engineering Power Engineering Department Niš Serbia University of Niš Faculty of Sciences and Mathematics Department of Physics Niš Serbia University of Niš Faculty of Electronic Engineering Control Systems Department Niš Serbia University of Niš Faculty of Electronic Engineering Department of Electronics Niš Serbia University of East Sarajevo Faculty of Electrical Engineering East Sarajevo Bosnia and Herzegovina

ISBN: (纸本)9798350386998

This study offers experimental testing of commercial and laboratory inverters, utilized in a laboratory prototype of an urban microgrid. Operation of grid inverters supplied by PV arrays in urban environments, encounters challenges such as partial shading and soiling. Emulation of the current-voltage characteristics of PV arrays enables repeated and reliable testing of inverter operation under irregular supply conditions. It has been shown that finding the maximum power point can be challenging under conditions of partial shading and soiling. Additionally, meeting the grid quality standards for the delivered power represents a challenge. Satisfying these requirements can be achieved through careful design of LCL filters at inverter output terminals, but further improvement can be achieved only through an adequate selection of the primary controller. To further improve the quality of grid currents, the possibility of applying innovative control algorithms has been demonstrated for laboratory inverters. Application of sliding mode controllers, besides ensuring system robustness, can prevent overshoots and fault responses from the current protection circuit by introducing a specific anti-windup structure. © 2024 IEEE.

关键词： Sliding mode control

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Properties of Resonant Converter as controlled Object with Amplitude, Frequency and Pulse-Width Methods of Output Voltage Regulation 5

Properties of Resonant Converter as Controlled Object with A...

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5th IEEE KhPI Week on Advanced Technology, KhPIWeek 2024

作者： Pavlov, Gennadiy Obrubov, Andrii Vinnychenko, Iryna Kazariezov, Anatolii Department of Computerized Control Systems Admiral Makarov National University of Shipbuilding Mykolaiv Ukraine Department of Ship Electric Power Plants Admiral Makarov National University of Shipbuilding Mykolaiv Ukraine Department of mechanical engineering Admiral Makarov National University of Shipbuilding Mykolaiv Ukraine

On the basis of linearized mathematical models, an analysis of the dynamic and static properties of a two-bridge resonant converter with a series resonant circuit with amplitude, frequency, and pulse-width regulation ... 详细信息

ISBN: (纸本)9798350384499

关键词： Resonant converters

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