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SSRN 2024年

作者： Zhang, Hanfei Guo, Jiaping Wang, Yuanhui Ji, Shuaiyu Shao, Jie Desideri, Umberto Duan, Liqiang School of Energy Power and Mechanical Engineering North China Electric Power University Beijing China Mechanical Department Thermal Power Branch Company State Nuclear Electric Power Planning Design & Research Institute Co. Ltd Beijing China Department of Energy Systems Territory and Constructions Engineering University of Pisa Pisa Italy

Solar-assisted coal-fired power generation technology has the promise of reducing the capital cost of purchasing solar thermal power generation equipment, as well as reducing carbon emissions and fossil fuel consumption. The temperature of trough solar energy collector generally does not exceed 400°C, and it has been proven to be a reasonable choice to couple it with the feedwater heater of pulverized coal power system. This paper offers a new parabolic trough solar-assisted coal-fired power generation system with waste heat utilization and carbon capture. A part of the feedwater is directed to heat the carbon capture subsystem and the working medium of Kalina cycle before being heated by solar energy. A pulverized coal power generation system is used as the reference system (Case 1), and parabolic trough solar sub-system, Kalina cycle sub-system, and monoethanolamine carbon capture sub-system are gradually integrated with the reference system to form different new systems of Case 2-4, and a 4E analysis is conducted for these four Cases. The results of this study indicate that these four cases have system thermal efficiencies of 44.87%, 44.09%, 44.14%, and 43.96% in the power-boosting operation mode, and exergy efficiencies of 44.36%, 43.67%, 43.69%, and 43.52%, respectively. Compared with Case 1, the carbon emission rates of Case 2 to 4 decrease by 11.66g/kWh, 12.57 g/kWh, and 17.79 g/kWh, respectively. The LCOE of Case 1 is 0.04262$/kWh, and those of Case 2 to 3 decrease to 0.04215$/kWh and 0.04216$/kWh, respectively, the LCOE of Case 4 is 0.04267$/kWh. All four cases have payback period of less than 4 years. Adding waste heat recovery and carbon capture devices to pulverized coal power system will reduce carbon emissions and low temperature heat loss. This work will also contribute to the realization of carbon peaking and carbon neutrality. © 2024, The Authors. All rights reserved.

关键词： Solar energy

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4e Performance Analysis of a Solar-Assisted Coal-Fired power System Integrated with Kalina Cycle and Carbon Capture

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SSRN 2024年

作者： Zhang, Hanfei Guo, Jiaping Wang, Yuanhui Ji, Shuaiyu Shao, Jie Desideri, Umberto Duan, Liqiang School of Energy Power and Mechanical Engineering North China Electric Power University Beijing China Mechanical Department Thermal power branch company State Nuclear Electric Power Planning Design & Research Institute Co. Ltd Beijing China Department of Energy Systems Territory and Constructions Engineering University of Pisa Pisa Italy

Solar-assisted coal-fired power generation technology has the promise of reducing the capital cost of purchasing solar thermal power generation equipment, as well as reducing carbon emissions and fossil fuel consumption. The temperature of trough solar energy collector generally does not exceed 400°C, and it has been proven to be a reasonable choice to couple it with the feedwater heater of pulverized coal power system. This paper offers a new parabolic trough solar-assisted coal-fired power generation system with waste heat utilization and carbon capture. A part of the feedwater is directed to heat the carbon capture subsystem and the working medium of Kalina cycle before being heated by solar energy. A pulverized coal power generation system is used as the reference system (Case 1), and parabolic trough solar sub-system, Kalina cycle sub-system, and monoethanolamine carbon capture sub-system are gradually integrated with the reference system to form different new systems of Case 2 to Case 4, and a 4E analysis is conducted for these four Cases. The results of this study indicate that these four Cases have system thermal efficiencies of 44.87%, 44.09%, 44.14%, and 43.96% in the power-boosting operation mode, and exergy efficiencies of 44.36%, 43.67%, 43.69%, and 43.52%, respectively. Compared with Case 1, the carbon emission rates of Case 2 to Case 4 decrease by 11.66g/kWh, 12.57 g/kWh, and 17.79 g/kWh, respectively. The LCOE of Case 1 is 0.04262$/kWh, and those of Case 2 to Case 3 decrease to 0.04215$/kWh and 0.04216$/kWh, respectively, the LCOE of Case 4 is 0.04267$/kWh. All four cases have payback period of less than 4 years. Adding waste heat recovery and carbon capture devices to pulverized coal power system will reduce carbon emissions and low temperature heat loss. This work will also contribute to the realization of carbon peaking and carbon neutrality. © 2024, The Authors. All rights reserved.

关键词： Solar energy

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Application of Extreme Learning Machine for Shunt Faults Detection and Classification in Three-phase Transmission Line systems 3

Application of Extreme Learning Machine for Shunt Faults Det...

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3rd IEEE International Conference on Signal, control and Communication, SCC 2023

作者： Assadi, Khaoula Slimane, Jihane Ben Salhi, Salah University of Tunis El Manar National Engineering School of Tunis LR11ES20 Analysis Design and Control of Systems Laboratory Tunis1002 Tunisia Northern Border University Faculty of Computing and InformationTechnology Department of Computer Sciences Rafha91911 Saudi Arabia

ISBN: (纸本)9798350326390

The electrical power transmission lines play a crucial role in maintaining a continuous electricity supply. However, the exposed environment of these lines increases the risks of faults occurrence, necessitating prompt detection, and classification, to eliminate them within a specified time. In light of this, the present study introduces a methodology for the detection and classification of faults in a three-phase transmission line system employing the Extreme Learning Machine (ELM). A 220 kV, 300 km three-phase transmission line system was simulated in MATLAB/Simulink software, where the current and voltage signals were generated under different fault conditions including fault types, fault inception time, and fault resistance. The fundamental components of these signals were used as inputs in the ELM model. Different shunt fault types, including line-to-ground, line-to-line, double-line-to-ground, triple-line, and triple-line-to-ground were applied for fault detection and classification framework. Furthermore, the optimum number of hidden neurons in the ELM model was investigated in this study. In terms of the Mean Squared Error (MSE) and correlation coefficient, four ELM variants based on Sine, Sigmoid, Radial Basis, and Triangular Basis transfer functions were assessed for each module. The outcome of these metrics indicates that the ELM with the sigmoid model demonstrated superior performance compared to the other ELM models. Based on statistical metrics MSE, Root Mean Squared Error (RMSE), and Mean Absolute Error (MAE), and also the computational time, the efficiency of ELM-Sigmoid and state-of-the-art methods of Multi-Layer Perceptron Neural Network (MLPNN) and Radial Basis Function Neural Network (RBFNN) were compared and analyzed during training and testing phases. The results obtained revealed that the ELM-Sigmoid model outperforms the other models in the detection and classification of shunt faults with significant accuracy and fast computational speed. ©

关键词： Fault detection

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Calculation and Analysis Method of Gear Wear on Drum Screen Drivers

Calculation and Analysis Method of Gear Wear on Drum Screen ...

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Robotics & Intelligent Manufacturing Technology (ISRIMT), International Symposium on

作者： Yueming Fu Jing Wang Xuan Chen Gang He Engineering Research & Development Department China Nuclear Power Engineering Design Co. Ltd. Shenzhen China Instrument and Control Department China Nuclear Power Engineering Design Co. Ltd. Shenzhen China College of Mechanical & Electrical Engineering Hohai University Chanzhou China

This study addresses the challenge of predicting gear wear in the driving device of drum screen equipment used in nuclear power plants. We propose a calculation method for estimating tooth wear of involute gears operating under low-speed conditions based on the discrete tooth profile with equal pressure angle. The tooth profile curve is generated during the hobbing process and integrated the pressure angle with the load distribution model. Additionally, we implement continuous updating of the tooth load distribution coefficients during the numerical calculation process, and validate the accuracy of our model by comparing it with experimental data. The analysis results indicate that the location of the most severe wear is near the tooth root, and a sudden change in tooth wear curve is observed at the transition between single- and double-tooth meshing areas. The proposed calculation method provides a reference for predicting the tooth surface wear of involute spur gears under low-speed conditions.

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Improving the Energy Efficiency of a Mine Drainage Installation by Means of an Industrial Electric Drive 3

Improving the Energy Efficiency of a Mine Drainage Installat...

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3rd IEEE KhPI Week on Advanced Technology, KhPI Week 2022

作者： Baranovskyi, Vladyslav Chornyi, Oleksii Busher, Victor Kuznetsov, Valeriy Hubskyi, Petro Lelikova, Olha Kryvyi Rih National University Electromechanical Systems in Industry and Transport Department of Automated Kryvyi Rih Ukraine Kremenchuk Mykhailo Ostrohradskyi National University Department 'Systems of Automatic Control and Electric Drive' Kremenchuk Ukraine National University 'Odessa Maritime Academy' Department of Electrical Engineering and Electronics Odessa Ukraine Railway Research Institute Electric Power Department Warsaw Poland Karaganda Industrial University Department 'Power Engineering Temirtau Kazakhstan

ISBN: (数字)9798350399202

ISBN: (纸本)9798350399202

The publication is devoted to determining the possibilities of reducing the energy consumption of drainage systems of mines and determining the numerical indicators of energy saving using mathematical modeling. Novelty of paper. The minimum required structure of the mathematical model of the mine drainage horizon for the study of energy consumption is substantiated, the existence of the minimum energy consumption of the main drainage pump at speed control is proved, the appearance of regression dependences of energy consumption and pump operating time on speed and inflow. Research methods. General methods of physics, hydraulics, mathematical analysis and computational mathematics were used in solving the tasks. Numerical solution of mathematical model equations and visualization of the obtained results were performed in MATLAB® / Simulink environment, methods of experimental design theory for regression analysis. The results obtained. The conditions under which the potential for energy saving of the pumping equipment of the main drainage of mines when using an adjustable electric drive appears. The existence of the minimum energy consumption of the pumping unit of the main drainage of the mine has been proved. Based on the regression analysis of the results of mathematical modeling of the pumping station of the main drainage of the mine, it is established that the regression dependences of the pumping unit operation time and its energy consumption have a shape close to the hyperboloid section. Practical value. The use of the results of work makes it possible in different mines to determine the potential for energy savings when using an adjustable electric drive, to make an economically sound decision on the feasibility of using an adjustable electric drive in specific production conditions. © 2022 IEEE.

关键词： Regression analysis

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Fuzzy control System of Arc Furnace Modes with Phase Load Equalization 14

Fuzzy Control System of Arc Furnace Modes with Phase Load Eq...

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14th International Conference on Advanced Computer Information Technologies, ACIT 2024

作者： Hoholyuk, Oksana Paranchuk, Yaroslav Stakhiv, Petro Shabatura, Yuriy Kuznyetsov, Oleksiy Rudyy, Taras Lviv Polytechnic National University Institute of Power Engineering and Control Systems Lviv Ukraine Lviv Polytechnic National University Lviv Ukraine Hetman Petro Sahaidachnyi National Army Academy Lviv Ukraine Hetman Petro Sahaidachnyi National Army Academy Department of Electromechanics and Electronics Lviv Ukraine Lviv State University of Internal Affairs Lviv Department of Informatics Ukraine

ISBN: (纸本)9798350350036

A double-loop structure of the high-speed fuzzy control of the electric arc furnace (AF) electric mode (EM) coordinates for the equalization of phase loads is proposed. System-technical solutions have been developed to increase the control speed of the EM coordinates and the implementation of phase-by-phase independent adjustment of the arc lengths. The components of the system control vector for the implementation of multi-criteria optimization of melting modes are substantiated. The proposed solutions are aimed at comprehensive improvement of the energy efficiency as well as the electromagnetic compatibility of AF and power grid modes. A computer Simulink-model of the developed double-loop AF EM control system was created and a study of the efficiency of the proposed solutions was carried out. A significant decrease of the phase loads asymmetry coefficient, a decrease in the of the EM coordinate dispersion, as well as an improvement in the indicators of electrotechnological efficiency and electromagnetic compatibility of the AF and the power grid are confirmed by the analysis of the results of their use. © 2024 IEEE.

关键词： Electric arc furnaces

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Distribution of Temperature and Characteristics of Soot Volume Fraction in MILD-OCC Flame 9th

Distribution of Temperature and Characteristics of Soot Volu...

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9th International Symposium on Coal Combustion, ISCC 2019

作者： Lu, Jingwen Zhang, Shuwei Tan, Longhui Lu, Jianyi Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science and Engineering North China Electric Power University Baoding071003 China MOE Key Laboratory of Resources and Environmental Systems Optimization College of Environmental Science and Engineering North China Electric Power University Beijing102206 China

ISBN: (纸本)9789811616563

Coal and methane were burnt in the MILD-OCC combustion flame under different combustion conditions to study the temperature distribution and characteristics of soot volume fraction. In this experiment, the flame temperature distribution is measured by thermocouple and the volume fraction (fv) of soot at each sampling point is calculated, then combining with the mass concentration of soot by the filter weighing method to obtain the distribution characteristics of soot in the flame. The results of thermocouple particle densitometry (TPD) show that the formation and oxidation of soot at every point in the flame is related closely to its position and temperature in the flame. The fv of soot in the center of the flame is negatively correlated with the temperature of the flame during the MILD-OCC combustion. The lower temperature region of the flame is conducive to the growth of soot, which leads to higher value of fv. The higher temperature in the center of the flame is beneficial to the oxidation of the soot particles, resulting to lower value of fv. The results of the filter membrane weighing method show that the formation of soot mainly occurs in the central region of the flame. When the radial distance increases, the flame temperature rises, and the soot concentration decreases due to oxidation. On the whole, the distribution of soot measured by the filter membrane weighing method is roughly consistent with that calculated by the TPD, which provides a reference for further research on the MILD-OCC combustion. © 2022, Tsinghua University Press.

关键词： Thermocouples

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Research and Development of Algorithms for the Functioning of the Phase-to-Phase Overcurrent Protection Based on Data from Digital Transformers with Rogowski Coils for Overhead and Cable power Lines 35 kV

Research and Development of Algorithms for the Functioning o...

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2022 International Conference on Industrial engineering, Applications and Manufacturing, ICIEAM 2022

作者： Yablokov, Andrey Dvoynenkov, Mikhail Sharygin, Dmitry Kabakov, Pavel University Named after V.I. Lenin Ivanovo State Power Engineering Department of Electric Power Systems Automatic Control Ivanovo Russia Jsc 'RADIUS Avtomatika' Separate Structural Department Ivanovo Russia RTsoft - Smart Grid Jsc 'RTSoft' Ivanovo Russia

ISBN: (纸本)9781665483698

The development of microprocessor technology has led to the creation of new types of instrument transformers that were not previously used in the electric power industry. Their characteristics require additional study of existing relay protection and automation algorithms and allow to develop of new ones. However, serious theoretical and experimental studies in all possible operating modes should precede the using of such algorithms. This article describes some aspects of the implementation of overcurrent protection that receives information in digital form from Rogowski coils and resistive voltage dividers, considering the key features and advantages of these type of sensors. © 2022 IEEE.

关键词： Voltage dividers

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design of Pelton Turbine Test Stand in Plateau Environment 4

Design of Pelton Turbine Test Stand in Plateau Environment

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4th IAHR Asian Working Group Symposium on Hydraulic Machinery and systems

作者： Cai, Jinhan Zhou, Xuejun Luo, Hongying Wang, Zhengwei Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China College of Mechanical Engineering Tianjin Sino-German University of Applied Science No. 2 Yashen Road Tianjin China College of Hydraulic and Civil Engineering Tibet Agricultural and Animal Husbandry University China Department of Energy and Power Engineering Tsinghua University China

In recent years, with the continuous development of China's hydropower projects, Pelton turbines are gradually being valued, and the focus of development has shifted from plain areas to plateau areas. Environmental impacts such as high altitude, water temperature, and high sediment content in the plateau area have caused serious interference to equipment that originally worked in a stable environment, for example, the failure of the cooperation between the parts of the turbine and the mutual seizure, the increased wear of the nozzle needle, the decrease of the flow rate and the water outlet speed of the nozzle, and the decrease of the air pressure in the plateau environment lead to the change of the flow state of the nozzle. In view of the above problems, this paper puts forward the design scheme of impulse turbine test-bed, using the method of changing specific speed to determine the basic parameters of impulse turbine unit, so as to eliminate the influence of plateau environment on the normal operation of turbine, obtain the efficiency condition of model experiment under low ambient pressure, and improve the operation efficiency and reliability of turbine unit. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Nozzles

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A robust optimization formulation for the integration of photovoltaics in a low-voltage distribution network: Malta case study

A robust optimization formulation for the integration of pho...

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14th Mediterranean Conference on power Generation Transmission, Distribution and Energy Conversion (MEDpower 2024)

作者： Vlad Costea Brian Azzopardi Kenneth Scerri The Foundation for Innovation and Research – Malta (FiR.mt) Design Center Tower Road Birkirkara Malta Department of Systems and Control Engineering Faculty of Engineering The University of Malta (UM) Msida Malta

ISBN: (数字)9781837242689

The Maltese islands’ high solar irradiance makes them an ideal location for photovoltaic systems (PVs), offering significant potential for sustainable and decentralized power generation. In the context of low-voltage (LV) distribution networks, various studies utilizing stochastic analyses have linked an increase in PV penetration with voltage violations at load buses and line thermal limit violations resulting from reverse power flows through the feeder head. Despite these challenges, real-time active network management (ANM) solutions for addressing such issues have been underexplored. This paper introduces a robust optimization approach coupled with the open-source tool Open-DSOPF to obtain quantitative data on how PV active power generation may be curtailed to ensure a network can stay within the nominal operational limits. Real smart-meter load and PV profile data is used in the simulation, ensuring accurate modelling of a Maltese LV feeder from the island of Gozo. Open-DSOPF is used to perform a three-phase unbalanced optimal power flow seeking to minimize PV active power curtailment. Results show that curtailment is positively correlated with the total feeder path length to load buses at which PVs are present.

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