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Research on Multi-objective Coordination Strategies for Active Distribution Networks Based on Dynamic Energy Storage Management

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Research on Multi-objective Coordination Strategies for Acti...

Clean Energy and Electric Power Engineering (ICCEPE), International Conference on

作者： Huaping Yin Yeqin Ma Mouhai Liu Jiale Li State Grid Hunan Electric Power Limited Company Changsha China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology (Power Supply Service Center (Metrology Center) State Grid Hunan Electric Power Limited Company Changsha China School of Electrical & Information Engineering Changsha University of Science & Technology Changsha China

ISBN: (数字)9798350390315

ISBN: (纸本)9798350390322

Aimed at the challenges posed by the increasing penetration of renewable energy sources (RES) in active distribution networks, particularly concerning local consumption and transmission barriers of harvested RES, this study investigates a coordination control methodology between distributed energy storage systems (ESS), volatile renewable power generation systems, and highly stable large-scale grid systems under secure operational conditions. Initially, the dynamic variations in charging and discharging depths during operation are considered, leading to a dynamic modeling of the state-of-charge (SOC) for ESS batteries. On the premise of ensuring the safety of distributed ESS, a multi-objective comprehensive optimization strategy is developed to enhance RES accommodation, augment regional grid RES export capability, and maximize economic benefits. Ultimately, the feasibility and rationality of the proposed strategy are validated through simulations, which demonstrate that the approach enables different storage units to adjust their charge-discharge depths, significantly improving the capacity for integrating renewable energy.

关键词： Economics Renewable energy sources Storage management Batteries Safety Power systems Active distribution networks State of charge Resource management Power generation

Predicting the Band Gap of Kinked Mo6s6 Nanowires Based on Band Folding Theory

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SSRN 2024年

作者： Yao, Yongsheng Teng, Jianjin Guo, Jiayi Cao, Juexian Wei, Xiaolin Key Laboratory of Micro-nano Energy Materials and Application Technologies University of Hunan Province College of Physics and Electronics Engineering Hengyang Normal University Hengyang421002 China Xiangtan University China Department of Physics Laboratory for Quantum Engineering and Micro-Nano Energy Technology Xiangtan University Hunan Xiangtan411105 China

Transition-metal chalcogenide (TMC) nanowires are an important building block for semiconductor components, which is conducive to the miniaturization and integration for nano-electronic devices and optoelectronic functional devices. Here, using density-functional theory (DFT) methods, we unveil intriguing electronic properties of kinked Mo6S6 nanowires (Mo6S6-NWs.) The results demonstrate that the shorter kinked Mo6S6 nanostructures exhibit distinct semiconductor behavior compared to the intrinsic Mo6S6-NWs, with the band gap being highly dependent on the length of the intrinsic Mo6S6-NWs between the kinks. Importantly, the band gap of kinked Mo6S6-NWs can be predicted by the band-folding theory, and the predicted value is extremely close to the actual calculated value. In addition, under uniaxial tension and compression strain, the band gap of long kinked Mo6S6-NWs changes within a narrow range, indicating their excellent electronic stability. This is mainly attributed to the small contribution of Mo/S atoms in the kinked part to valence band maximum (VBM) and conduction band minimum (CBM). Our work provides a useful theoretical insight for electronic properties of kinked Mo6S6-NWs, which open up the possibility of tailoring the properties of TMC nanowires, providing an ideal candidate material for the construction of flexible nanodevices. © 2024, The Authors. All rights reserved.

关键词： Density functional theory

Effect of Early CO2 Curing and Subsequent Water Curing on the Interfacial Transition Zone between Cement Paste and Aggregates

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SSRN 2024年

作者： Huang, Yan Zhang, Jian Hu, Xiang Wang, Yue Drissi, Sarra Shi, Caijun College of Civil Engineering Hunan University Changsha410082 China Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province Changsha410082 China Key Laboratory of Building Safety and Energy Efficiency Ministry of Education Hunan University Changsha410082 China Department of Civil Engineering and Energy Technology Faculty of Technology Art and Design Oslo Metropolitan University PO box 4 St Olavs Plass OsloNO-0130 Norway

This study investigated the effect of early CO2 curing and subsequent saturated lime water curing on the interfacial transition zone (ITZ) between cement paste and aggregate, focusing on bond strength, pore structure, and phase compositions. The CO2 curing followed by water curing is an effective and sustainable method to enhance the ITZ's performance. The CO2 curing eliminated portlandite oriented within the ITZ and promoted the formation of calcite and silica-rich gels, resulting in a 10% reduction in porosity, a 20 µm decrease in thickness and a 50% enhancement in bond strength of the ITZ. The continuous hydration of the uncarbonated clinker during subsequent water curing further reduces the porosity and enhances the bond strength of the ITZ. Furthermore, the utilization of CO2 curing has demonstrated remarkable efficiency in enhancing the performance of the ITZ adjacent to limestone compared to granite. This can be attributed to the lower energy barrier for nucleation and faster rate of calcite nucleation on the surface of limestone. © 2024, The Authors. All rights reserved.

关键词： Carbon dioxide

New approach to select the fault line based on transient energy features of fault phase

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New approach to select the fault line based on transient ene...

2021 IEEE International Conference on Computer Science, Electronic Information Engineering and Intelligent Control technology, CEI 2021

作者： Xiao, Yu Ye, Zhi Huang, Ru Liu, Mouhai Ma, Yeqing Wang, Jianzhong Zhao, Yantao Xu, Yong Wei, Xiongfei Teng, Zhaosheng Gao, Yunpeng State Grid Hunan Electric Power Limited Company Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha China Wasion Group Limited Changsha China College of electrical and information engineering Hunan University Changsha China

ISBN: (纸本)9780738146492

A new approach for fault line detection using Wavelet energy feature of fault-phase transient current is proposed. This novel method utilizes the phase selection function of insulation monitoring system and the differences of transient current between fault line and non-fault line. Firstly, the transient current signals of each phase fault are extracted to identify the faulty phase effectively. The pure fault component is obtained by noise elimination. Then, each phase wavelet energy feature can be achieved by the decomposition and reconstruction of wavelet packet. The fault line can be detected by comparing energy feature of each phase for the reason that the fault line's energy characteristics of fault phase are much greater than that of non-fault line under single phase grounding fault. This approach is clear in physical mechanism and unaffected by operating mode, circuit components, fault conditions and other factors. It can also effectively overcome the system noise, the interference of asymmetrical component. The line selection method has broad margin and high reliability, which is practical to applications. © 2021 IEEE.

关键词： Wavelet decomposition

Peanut-Shaped Core Shell Structural Porous Carbon Based Electrochemical Sensor for Detection of Luteolin In Food Extracts

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SSRN 2023年

作者： Li, Jiejun Li, Yuhong Zhao, Pengcheng Fei, Junjie Xie, Yixi Yang, Yaqi Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education Xiangtan University Xiangtan411105 China Key Laboratory for Green Organic Synthesis and Application of Hunan Province Xiangtan University Xiangtan411105 China Hunan Institute of Advanced Sensing and Information Technology Xiangtan University Xiangtan411105 China

An ultrasensitive electrochemical sensor for luteolin was developed. By polymerizing Fe2O3 with dopamine and subsequently depositing cobalt on the surface, a co-doped porous carbon-nitrogen material Fe2O3-Co-MMC was prepared. The material was then modified onto the glassy carbon electrode to constract the electrochemical sensor. After optimization, the sensor exhibited good detection of Lu with a low limit of detection (LOD) of 0.031 nM and a wide linear range from 0.05-1000 nm. It also demonstrated excellent reproducibility, stability, and anti-interference properties. The sensor was successfully applied to detect Lu in real food samples such as honeysuckle. |The results indicated a new method for detecting Lu and other phytochemicals. © 2023, The Authors. All rights reserved.

关键词： Electrochemical sensors

Ultra-Sensitive Baicalin Electrochemical Sensor Based On γ -Cyclodextrin Supramole Derived N,Zn Double-Doped Carbon Nanosphere

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SSRN 2023年

作者： Zhang, Mengting Huang, Xuejia Li, Jiejun Li, Yuhong Zhao, Pengcheng Fei, Junjie Xie, Yixi Key Laboratory of Environmentally Friendly Chemistry and Applications Ministry of Education Xiangtan University Xiangtan411105 China Key Laboratory for Green Organic Synthesis and Application of Hunan Province Xiangtan University Xiangtan411105 China Hunan Institute of Advanced Sensing and Information Technology Xiangtan University Xiangtan411105 China

Baicalin (Bn) is the main component of the Chinese patent medicine Baicalin Tablet which is used for the auxiliary treatment of acute, chronic hepatitis and persistent hepatitis. Herein, an ultrasensitive electrochemical sensor was manufactured based on the nitrogen and zinc double doped carbon nanospheres(ZnN-CNS) derived from γ-cyclodextrin self-assembled supermolecules with ZnCl2. The sensing nanomaterials were characterized and investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), raman spectroscopy (RS), and scanning electron microscopy (SEM), etc. Under the optimized optimal environment, the linear detection range of the prepared sensor for Bn was ranged from 1×10-8 to 7.5×10-7 M, where the LOD was 7.17×10-8 M with a sensitivity of 220 A/M. Good accuracy and desirable recovery results for the detection of Bn in real samples (Bear bile scutellaria eye drops and Shuanghuanglian oral liquid) were also observed. This work provides a new idea about the detection of Bn as well as the application of novel binary doped carbon materials. © 2023, The Authors. All rights reserved.

关键词： Carbonization

Detection of Gallic Acid in Food Using an Ultra-Sensitive Electrochemical Sensor Based on Glass Carbon Electrode Modified by Bimetal Doped Carbon Nanopolyhedras

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SSRN 2023年

作者： Xie, Yixi Li, Jiejun Yang, Yaqi Li, Yuhong Zhao, Pengcheng Fei, Junjie Key Laboratory of Environmentally Friendly Chemistry and Applications Ministry of Education Xiangtan University Xiangtan411105 China Key Laboratory for Green Organic Synthesis and Application of Hunan Province Xiangtan University Xiangtan411105 China Hunan Institute of Advanced Sensing and Information Technology Xiangtan University Xiangtan411105 China

Gallic acid is widely used as an antioxidant in food because of its good antioxidant function, but excessive intake induces side effects in humans, so it is essential to devise a highly responsive technique for detecting gallic acid. In this work, we synthesized ZIF-67@FePc by the one-pot method. The synthesized material is more stable at high temperatures compared to ZIF-67 and maintains its original morphology during pyrolysis, when iron was introduced as a second metal active site during the synthesis process. Subsequently, Co/FeOX@NC-800 was employed to fabricate a GA sensor on a GCE. The developed sensor exhibited remarkable sensitivity towards GA, featuring a low LOD of 1.30 nM and a linear range spanning from 5 to 4500 nM. The electrochemical sensors we have prepared also showed good selectivity, stability, and reproducibility. It has been successfully employed for detecting GA in actual samples such as apples, grapes, tomatoes, and red wine. © 2023, The Authors. All rights reserved.

关键词： Antioxidants

Mechanism of Local Electric Oxidation on Two-Dimensional MoS2 for Resistive Memory application

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SSRN 2024年

作者： Dong, Hui Mu, Junzheng Peng, Jinfeng Zheng, Xuejun Chu, Liang School of Electro-mechanical Engineering Guangdong University of Technology Guangzhou510006 China School of Electronics and Information Institute of Carbon Neutrality and New Energy Hangzhou Dianzi University Hangzhou310018 China School of Mechanical Engineering & Engineering Research Center of Complex Tracks Processing Technology and Equipment of MoE Key Laboratory of Welding Robot and Application Technology of Hunan Province Xiangtan University Xiangtan411105 China

The manipulation and mechanism of two-dimensional (2D) transition metal dichalcogenides (TMDs) by external electric field are extremely significant to the photoelectric properties for guiding their applications. Herein, the 2D MoS2 nanosheets were locally oxidated to form MoS2-MoO3 local heterojunctions by electric field from atomic force microscopy tip, which were further applied in mutilstate memristors for the proposal of NanoQR code. A modified thermal oxidation model has been derived through introducing Ohmic dissipation to reveal the mechanism of local electric oxidation on 2D MoS2. From current-voltage curves, the barrier height of MoS2 device showed an increase of 0.39 eV due to local oxidation after applying voltage for 480 s. Based on density-functional theory, the increase of barrier height was theoretical calculated as 0.38 eV between MoS2-MoS2 and MoS2-MoO3 supercells, supporting the formation of MoO3 under the local electric field. The manipulated 2D MoS2-MoO3 local heterojunctions were further applied as unprecedented mutilstate memory storage at the nanoscale, which induced the proposal of NanoQR code as strong-encryption information. The findings suggest a novel strategy on precisely controlling local electric oxidation on 2D TMDs to manipulate the properties for application of photoelectric memory nanodevices. © 2024, The Authors. All rights reserved.

关键词： Heterojunctions

A Comprehensive Analysis Method for Optimal Configuration of Smart Meter Data Collector Based on PSO-BP Algorithm 2021

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A Comprehensive Analysis Method for Optimal Configuration of...

The 4th International Conference on Information Technologies and Electrical Engineering

作者： Minqi Yu Liman Shen Maotao Yang Linjin Xie Xing He Shumin Wei Grid Hunan Electric Power Corporation Limited China and Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology China Grid Hunan Electric Power Corporation Limited China

ISBN: (纸本)9781450386494

Aiming at the current electric power industry's problems related to the unreasonable configuration of smart meter data collectors and the smart meter measurement technology, this paper proposes a comprehensive analysis method for the optimal configuration of smart meter data collectors based on the PSO-BP neural network prediction model. Through the analysis of historical data in the station area, PSO is used to optimize the index. The database is established to import the BP neural network algorithm and training, and then the prediction of the station area to be configured with the data collector is completed. The experimental case proves that the above steps can reasonably configure the collector in the station area and optimize the data collection of the smart meter. While realizing convenient and effective data transmission, it also guarantees a certain degree of economy.

关键词： BP particle swarm optimization Smart meter data collection