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Chlorine Degradation of Semi-Aromatic Polypiperazine-Amide Membranes and the Mechanisms

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SSRN 2023年

作者： Li, Meng-Fei Yang, Shao-Xia Fu, Wen-Jie Wang, Xiao-Mao Liu, Shu-Ming Huang, Xia Li, Jun State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China School of Water Conservancy and Hydropower Engineering North China Electric Power University Beijing102206 China College of Environment and Resources Guangxi Normal University Guangxi Guilin541004 China Department of Chemistry Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education Tsinghua University Beijing100084 China

Semi-aromatic polypiperazine-amide (PPA) nanofiltration (NF) membranes are widely used in water treatment applications, but the resistance to free chlorine and other biocidal agents need to be improved. Understanding the chlorination mechanisms of PPA NF membranes is of great significance for avoiding membrane degradation and developing new chlorine-resistant membranes. In this paper, the effects of chlorination on the rejection selectivity as well as the surface charge, hydrophilicity and roughness, and pore size distribution of PPA NF membranes are presented. In addition, the chlorination mechanisms of the membranes are proposed through functional groups characterization of the stripped PPA active layer, element composition analysis, quantum mechanical calculations based on density-functional theory, and use of model compound ((3,5-dimethylphenyl)(4-methylpiperazin-1-yl)methanone) for PPA material. The molecular active chlorine species, HOCl, predominantly induces the cleavage of C-N bonds, whereas the primary reaction pathway caused by the ionic active chlorine species, ClO-, involves the ring-opening of benzene. Under the same chlorination conditions, HClO has a more severe impact on membrane properties and performance than ClO-. NF membranes with a looser polyamide layer are more susceptible to the attack by active chlorine species. © 2023, The Authors. All rights reserved.

关键词： Chlorination

Multistage power generation planning approach for new power systems with high renewable energy integration considering flexibility constraints

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International Journal of Electrical power and Energy systems 2025年 169卷

作者： Li, Danyang Liu, Hongpeng Zhang, Jingwei Han, Xu Zhang, Shuxin The Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin Province Jilin 132012 China State Grid Jilin Electric Power Co. Ltd. Baicheng Power Supply Company Jilin Province Baicheng 137000 China State Grid Jilin Electric Power Co. Ltd. Jilin Power Supply Company Jilin Province Jilin 132000 China

Under the “dual-carbon” goals, the integration of high-proportion renewable energy has amplified operational uncertainties in new power systems, posing novel challenges to the economic planning of generation system expansion. However, existing power planning methodologies suffer from static modeling defects, incomplete constraint systems, and oversimplified cost structures, rendering them inadequate to support the low-carbon transition of emerging power systems. This necessitates a comprehensive consideration of system variability and flexibility to establish a multi-stage generation planning model. Addressing these limitations, this paper develops a fundamental multi-stage planning framework based on scenario tree structures, further incorporating carbon emissions and penalty costs for curtailed renewable energy. A flexibility-constrained multi-stage generation planning model is formulated, which resolves nonlinearity through auxiliary variable linearization and Benders decomposition algorithm. Case studies demonstrate that the proposed model achieves a 47.3% reduction in total 10-year planning costs for a typical regional system, comprising 39.5% operational cost savings and 46.3% carbon emission cost reduction, while elevating renewable energy accommodation rate to 80%. The model fulfills economic-environmental requirements and ensures system reliability. © 2025

关键词： Efficient use of energy High proportion of new energy Multistage generation planning New power system system flexibility requirements

A distributed event-triggered generalized Nash equilibrium seeking algorithm

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A distributed event-triggered generalized Nash equilibrium s...

第40届中国控制会议

作者： Xin Cai Feng Xiao Bo Wei State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University School of Control and Computer Engineering North China Electric Power University School of Electrical Engineering Xinjiang University

This paper addresses the problem of seeking generalized Nash equilibrium（GNE） for aggregative games with doubleintegrator agents by using a small-gain approach. In the existing continuous-time seeking algorithms, a default requirement for algorithms execution is that the interactions among agents be implemented in a continuous-time manner. This paper aims to overcome this weakness and presents an event-triggered communication scheme towards designing a distributed GNE seeking algorithm for agents to arrive at GNE of aggregative games. It is shown that the proposed scheme is free of Zeno *** results are presented to validate the proposed methods.

关键词： aggregative games coupled constraints double integrators event-triggered communication generalized Nash equilibrium

Super-Resolution Reconstruction of Electric power Inspection Images Based on Very Deep Network Super Resolution 6th

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Super-Resolution Reconstruction of Electric Power Inspection...

6th International Conference on Artificial Intelligence and Security, ICAIS 2020

作者： Shi, Bowen Gao, Jilong He, Zhentao Zhang, Tian Zhong, Tie Chen, Haipeng Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin CityJilin132012 China College of Electrical Engineering Northeast Electric Power University Jilin CityJilin132012 China School of Physics Northeast Normal University Changchun130024 China

ISBN: (纸本)9783030578831

Aiming at the problem of getting low resolution image and blurred image during unmanned aerial vehicle (UAV) inspection, a super-resolution reconstruction algorithm based on very deep network super resolution (VDSR) is proposed. The algorithm model is composed of deep convolution neural network and residual structure, which is improved on the basis of super resolution convolutional neural network (SRCNN). By deepening the network to 20 layers, the receptive field can be expanded, and the residual structure can be combined to obtain better reconstruction effect. The experimental results show that the proposed super-resolution method based on VDSR has richer texture and more realistic visual effect, with 2.95 dB and 0.037 improvement in PSNR and SSIM compared with the super-resolution methods based on Bicubic Interpolation, Sparse Coding and SRCNN. The proposed algorithm further promotes the theoretical research of inspection image super-resolution, and can be effectively applied to the practical application of power inspection. © 2020, Springer Nature Switzerland AG.

关键词： Textures

The parameter design method of smoothing inductance based on MMC-MTDC with R-type superconducting fault current limiter 16

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The parameter design method of smoothing inductance based on...

16th IET International Conference on AC and DC power Transmission, ACDC 2020

作者： Guo, Peiqian Yuan, Zhichang Liu, Guowei Zhao, Yuming Shi, Zinan State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China Shenzhen Power Supply Corporation Shenzhen China Sichuan Energy Internet Research Institute Tsinghua University Chengdu China

ISBN: (纸本)9781839533914

The rapid increase of voltage sourced converter brings the great development of the multi-terminal DC technology, both in the DC transmission and DC distribution fields. However, because of the weak impedance characteristic of the VSC-HVDC system, how to suppress and clear DC fault currents becomes a challenge. Considering the stability, the response speed and the system structure, it is not possible to apply excessive inductance at the DC side, hence, the current limiting effectiveness is relatively restricted. On the one hand, with the effective properties, Resistive type Superconducting Fault Current Limiter (R-SFCL) becomes an effective device to solve the problem of VSC-HVDC system under DC faults. On the other hand, because of dynamic energy-impedance characteristics of R-SFCL, the fixed impedance selection method at a certain time to carry out dynamic current limiting analysis is no longer applicable. Therefore, the DC fault current research and R-SFCL characteristic are comprehensively analyzed firstly in this paper. Based on that, a smoothing inductance determination method is proposed to cut off the DC fault current by DC breaker and ensure the continuous operation of remaining parts. Finally, based on a multi-terminal DC system simulation, the improvement and effectiveness of the proposed method are validated. © 2020 Institution of Engineering and Technology. All rights reserved.

关键词： Inductance

Efficient Computer Vision-Based Excavator Bucket Fill Estimation Using Depth Map and Faster R-Cnn

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SSRN 2023年

作者： Helian, Bobo Huang, Xiaoqian Yang, Meng Bian, Yongming Geimer, Marcus Institute of Mobile Machines Karlsruhe Institute of Technology Karlsruhe76131 Germany State Key Laboratory of Fluid Power and Mechatronic System Zhejiang University Hangzhou310027 China School of Mechanical Engineering Tongji University Shanghai201804 China Shanghai Engineering Research Center for Safety Intelligent Control of Building Machinery Shanghai200032 China

Excavators play an essential role in the construction industry, and the development of autonomous excavator systems is important for increasing productivity and improving worker safety. Accurate estimation of the volume of material in the excavator bucket is a key metric for monitoring and evaluating system automation performance. In this study, a novel solution is proposed that utilizes 2D depth maps as input to a faster region convolutional neural network (Faster R-CNN) model for bucket volume fill estimation. This approach achieves a high estimation accuracy while maintaining a fast real-time processing speed. In addition, a custom loss function is proposed specifically for the classification-regression task of this study to improve the network's generalization despite the data out of distribution. Comparative experiments show that the proposed approach achieves an impressive 96.91% accuracy in fill factor estimation, demonstrating its advantages and promising potential in the practical estimation of automated excavator operations. © 2023, The Authors. All rights reserved.

关键词： Automation

Fault Location Method for μPMU-Based Distribution Networks

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Fault Location Method for μPMU-Based Distribution Networks

Electrical Engineering and Automation (IFEEA), International Forum on

作者： Lei Wang Lin Niu Fengyuan Zhou Zhanjun Gao Power Grid Maintenance Training Department State Grid of China Technology College Jinan China Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China

With the development of communication technology and the wide-area measurement system, the prospect of incorporating active distribution networks (ADNs) with micro phasor measurement units (μPMUs) to obtain integrated system information for state estimation and fault location, is becoming increasingly promising. This paper presents a fault location method for ADNs with finite μPMUs. First, the configuration of the μPMUs is optimized to ensure that the entire distribution network is considered and that the global phasor information can be comprehensively utilized. The fault section detection criterion for the unbalanced current component amplitude comparison, is used to locate the fault. Utilizing PSCAD/EMTDC and MATLAB, it is verified that this method is not affected by the fault location and is suitable for multi-type faults and extreme disturbance. This method exhibits a high resilience to transition resistance and is robust when employed in the improved IEEE 33-node test system.

关键词： Resistance Distribution networks Fault location Phasor measurement units Permeability Wide area measurements state estimation

Wind Process Pattern Forecasting Based Ultra-Short-Term Wind Speed Hybrid Prediction

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SSRN 2022年

作者： Wang, Fei Tong, Shuang Sun, Yiqian Xie, Yongsheng Zhen, Zhao Li, Guoqing Cao, Chunmei Duić, Neven Liu, Dagui Department of Electrical Engineering North China Electric Power University Baoding071003 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China Hebei Key Laboratory of Distributed Energy Storage and Microgrid North China Electric Power University Baoding071003 China Dispatch and Control Center State Grid Xinjiang Electric Power Co. Ltd Urumqi830018 China Department of Mathematics and Physics North China Electric Power University Baoding071003 China Department of Energy Power and Environmental Engineering Faculty of Mechanical Engineering and Naval Architecture University of Zagreb Ivana Lucica 5 ZagrebHR-10000 Croatia

Wind power has received extensive attention due to its superiorities of clean and pollution-free. However, because of the randomness and volatility of wind power, accurate power prediction is needed to help its consumption. Wind speed is the key to wind power prediction. To tackle the deficiency of traditional prediction methods such as lacking of master the variation trend of wind speed, an ultra-short-term wind speed hybrid prediction method based on wind process pattern forecasting is proposed in this paper. Firstly, a wind process (WP) division method considering the influence of wind speed on the operation state, mode switch and output power of wind turbine is proposed. Secondly, according to the operating characteristics of the wind turbine, all the WPs is classified into different wind process patterns (WPP), and the effectiveness of the classification is verified. Then, the Adaboost classification algorithm is used to forecast the WPP of the next four hours. Finally, the wind speed hybrid prediction model of each pattern is established, the corresponding model is automatically selected based on WPP to predict the wind speed. simulation results show that the proposed model can reliably forecast future WPP and the wind speed prediction accuracy is better than conventional models. © 2022, The Authors. All rights reserved.

关键词： Wind

Effects of Microstructure and Temperature on Short Fatigue Crack Propagation Behaviour of Powder Metallurgy Superalloy Fgh4098 in Vacuum

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SSRN 2022年

作者： Zhang, L.C. Jiang, Rong Wang, Y.C. Zhang, L. Liu, J.T. Zhang, Y.W. Song, Y.D. Key Laboratory of Aero-engine Thermal Environment and Structure Ministry of Industry and Information Technology College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China Jiangsu Province Key Laboratory of Aerospace Power System College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China High Temperature Material Institute Central Iron and Steel Research Institute Beijing100081 China State Key Laboratory of Mechanics and Control Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing210016 China

Short fatigue crack propagation (SFCP) behaviour of a powder metallurgy (PM) superalloy (i.e. FGH4098) for aeroengine turbine disc application was investigated at room temperature and 650°C in vacuum (10-3 pa) by in-situ fatigue test. The SFCP mechanism was analyzed by the microstructural characterization and assessment of the SFCP rate. The results show that the SFCP resistance of fine grained (FG) FGH4098 is slightly better than that of course grained (CG) FGH4098 at room temperature due to the hindering effects of grain boundary, and close to that of CG FGH4098 at 650°C. The temperature exerts more evident influence on SFCP behaviour of FG FGH4098 due to the grain boundary oxidation compared with that of CG FGH4098. In the scenario which grain boundary oxidation is absent or insignificant, SFCP shows transgranular feature and is closely related to slip bands linked to the slip systems with high Schmid factor and/or geometric compatibility factor. Grain boundary oxidation still occurs in both FG and CG FGH4098 alloy and mainly forms Cr oxides at 650°C, which results in intergranular or mixed-inter-transgranular SFCP and promotes SFCP to some extent for FG FGH4098 alloy. © 2022, The Authors. All rights reserved.

关键词： Fatigue crack propagation