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Optimal operation of DES/CCHP based regional multi-energy prosumer with demand response

APPLIED ENERGY 2016年 167卷 353-365页

作者： Yang, Hongming Xiong, Tonglin Qiu, Jing Qiu, Duo Dong, Zhao Yang Changsha Univ Sci & Technol Hunan Prov Engn Res Ctr Elect Transportat Changsha 410114 Hunan Peoples R China Changsha Univ Sci & Technol Smart Distributed Network Hunan Prov Key Lab Smart Grids Operat & Control Sch Elect Engn & Informat Changsha 410114 Hunan Peoples R China Univ Newcastle Ctr Intelligent Elect Networks Callaghan NSW 2308 Australia Hunan Univ Sch Econ & Trade Changsha 410082 Hunan Peoples R China Univ Sydney Sch Elect & Informat Engn Sydney NSW 2006 Australia

The concerns on energy security and environment protection have driven the need to produce, transform and utilize energy in a more efficient, clean and diversified way. Under this background, we design a paradigm for energy hubs that combine distributed energy supply/combined cooling heating and power (DES/CCHP), renewable energy and energy storage. These energy hubs are comprised of heating, cooling and power systems, and natural gas, power generation and photovoltaic (PV) are the primary energy sources. Also, we propose a paradigm and its operation model for regional multi-energy prosumers (RMEP) whose energy demands are served by interconnected energy hubs. The energy exchange in energy hub is based on the structure of energy buses including power bus, heating bus and cooling bus. These energy buses are interconnected as a ring heating/cooling network and a radial power grid to implement mutually complementary reserves of energy hubs. Moreover, the bi-directional energy flows between prosumer and the main grid are also analyzed. In addition, an optimal scheduling model for RMEP is proposed. The formulated objective of this model is to minimize prosumer's cost of purchasing electricity and natural gas plus the cost of GHG emission or to maximize the revenue of selling electricity back to the grid, while considering various electricity and gas prices and heating/cooling demands during different time periods. The decision variables for prosumer include the amount of purchased gas, the amounts of purchased and sold electricity at energy hubs. Case studies are undertaken on the 15-node multi-energy prosumer system, where the system comprises three energy hubs. Prosumer's operational strategies under system normal and contingency conditions on typical summer and winter load days can be obtained. Comparative analyses between mutually independent energy hubs are also conducted. According to the simulation results, prosumer can play an important role in responding to the

关键词： Demand response DES/CCHP Energy hub Regional multi-energy Prosumer Optimal operation

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Insurance strategy for mitigating power system operational risk introduced by wind power forecasting uncertainty

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RENEWABLE ENERGY 2016年 89卷 606-615页

作者： Yang, Hongming Qiu, Jing Meng, Ke Zhao, Jun Hua Dong, Zhao Yang Lai, Mingyong Changsha Univ Sci & Technol Hunan Prov Key Lab Smart Grids Operat & Control Elect Transportat & Smart Distributed Network Hunan Prov Engn Res CtrSch Elect Engn & Informat Changsha 410114 Hunan Peoples R China Univ Newcastle Ctr Intelligent Elect Networks Callghan NSW 2308 Australia Univ Sydney Sch Elect & Informat Engn Sydney NSW 2006 Australia Changsha Univ Sci & Technol Sch Econ & Management Changsha 410114 Hunan Peoples R China Chinese Univ Hong Kong Shenzhen Shenzhen Guangdong Peoples R China

The increasing penetration of wind power significantly affects the reliability of power systems due to its intrinsic intermittency. Wind generators participating in electricity markets will encounter operational risk (i.e. imbalance cost) under current trading mechanism. The imbalance cost arises from the service for mitigating supply-demand imbalance caused by inaccurate wind forecasts. In this paper, an insurance strategy is proposed to cover the possible imbalance cost that wind power producers may incur. First of all, a novel method based on Monte Carlo simulations is proposed to estimate insurance premiums. The impacts of insurance excesses on premiums are analyzed as well. Energy storage system (ESS) is then discussed as an alternative approach to balancing small wind power forecasting errors, whose loss claims would be blocked by insurance excesses. Finally, the ESS and insurance policy are combined together to mitigate the imbalance risks of trading wind power in real-time markets. With the proposed approach, the most economic power capacity of ESS can be determined under different excess scenarios. Case studies prove that the proposed ESS plus insurance strategy is a promising risk aversion approach for trading wind power in real-time electricity markets. (C) 2015 Elsevier Ltd. All rights reserved.

关键词： electricity market Insurance strategy Risk sharing Underwriting premiums Wind power forecast errors

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Recognition Algorithm of Water Meter Dial in Natural Scene Based on YOLOV5s 4

Recognition Algorithm of Water Meter Dial in Natural Scene B...

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4th International Conference on Robotics, control and Automation Engineering (RCAE) / 4th International Conference on Advanced Mechanical and electrical Engineering (AMEE)

作者： Shen, Jinfei Li, Jianqi Cao, Binfang Li, Wei Huang, Lijuan Xu, Yaqian Jishou Univ Coll Informat Sci & Engn Jishou Peoples R China Jishou Univ Hunan Prov Key Lab Control Technol Distributed El Changde Peoples R China Hunan Univ Arts & Sci Hunan Prov Key Lab Control Technol Distributed El Changde Peoples R China Wuhan Inst Technol Sch Comp Sci & Engn Engn Res Ctr Intelligent Prod Line Equipment Hube Wuhan Peoples R China Hunan Univ Arts & Sci Sch Comp & Elect Engn Changde Peoples R China Xiangtan Univ Sch Automat & Elect Informat Xiangtan Peoples R China

ISBN: (纸本)9781665427302

In order to solve the problems of slow detection speed and low detection accuracy due to the complex conditions of the mechanical water meter dial under natural conditions after the network model is deployed on Android, this paper proposes a water meter dial recognition algorithm based on YOLOV5s. The lightweight convolutional neural network MobileNetV3 replaces the original backbone feature extraction network. The network model of the algorithm in this paper is smaller than YOLOV5s, the detection speed is accelerated while the accuracy is basically unchanged. Experimental results show that the average detection accuracy of the algorithm in this paper is basically unchanged compared to the original YOLOV5s, the model parameters are reduced by about 53.5%. After the network model is deployed on the Android device, the detection speed reaches 12FPS. It shows that the algorithm in this paper can realize real-time detection on Android devices.

关键词： water meter dial recognition Android YOLOV5s MobileNetV3 lightweight

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Surfactant-assisted synthesis of self-assembled Na3V2(PO4)2F3@C microspheres as the cathode for Na-ion batteries

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VACUUM 2023年第1期211卷

作者： Wang, Shi-jie Liang, Kang Li, Jian-bin Huang, Xiao-bing Ren, Yu-rong Changzhou Univ Jiangsu Prov Engn Res Ctr Intelligent Mfg Technol Sch Mat Sci & Engn Changzhou Key Lab Intelligent Mfg & Adv Technol Po Changzhou 213164 Peoples R China Hunan Univ Arts & Sci Coll Chem & Mat Engn Hunan Prov Key Lab Water Treatment Funct Mat Hunan Prov Key Lab Control Technol Distributed Ele Changde 415000 Peoples R China

Structurally stable Na3V2(PO4)2F3 (NVPF) is regarded as a promising cathode due to its large theoretical specific capacity. However, the poor electrical conductivity of NVPF results in poor rate capability. Herein, the tNVPF with dense textured microsphere structure was prepared by sodium dodecyl benzene sulfonate (SDBS)-assisted solvothermal method. The unique microstructure assembled by-100 nm nanorods provides massive active sites and promotes the fast transmission of Na + carriers. The electronic conductivity of tNVPF is further improved through coating by carbonizing polyacrylamide (PAM) to form tNVPF@C with great Na+ storage performance. Textured carbon-coated Na3V2(PO4)2F3(tNVPF@C) microspheres deliver a highly specific capacity (113.6/74.7 mAh center dot g- 1 at 0.2/10 C) and better long-term cycling performance with capacity retention ratio of 80.1% after 300 cycles at 5 C. Remarkably, the Na-ion full cell, which is assembled by commercial hard carbon as anode and tNVPF@C as cathode, can achieve a high capacity of 118.9 mAh center dot g-1 and energy density of 322.6 W h center dot kg- 1.

关键词： Dense textured microspheres Surfactant Carbonized polyacrylamide Na-ion full cell

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Multipoint adsorption constructs stable interface chemistry for high-nickel cathode material

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ENERGY STORAGE MATERIALS 2023年 63卷

作者： Wang, Shijie Liang, Kang Zhao, Hongshun Zhou, Bo He, Junfeng Wei, Peng Ding, Zhengping Li, Jianbin Huang, Xiaobing Ren, Yurong Changzhou Univ Jiangsu Prov Engn Res Ctr Intelligent Mfg Technol Sch Mat Sci & Engn Changzhou Key Lab Intelligent Mfg & Adv Technol Po Changzhou 213164 Peoples R China Hunan Univ Arts & Sci Coll Chem & Mat Engn Hunan Prov Key Lab Water Treatment Funct Mat Hunan Prov Key Lab Control Technol Distributed Ele Changde 415000 Peoples R China

LiNi0.83Co0.12Mn0.05O2 (NCM), a common commercial material, has been applied widely in electric mobility and large-scale energy storage fields with its high energy density and voltage platform. Nonetheless, the battery life of long-term operation is significantly harmed by the unstable crystal structure and cathode-electrolyte interface. Among these, capacity decay is closely associated with the dissolution of transition-metal ions. In the present work, a surface-modified strategy is proposed, that is, ethyl alpha-cyanoacrylate (ECA) is adsorbed to the transition metal site by polar functional group and then initiates its polymerization to obtain poly(ethyl alpha-cyanoacrylate) (PECA) coating. The functional coating can lessen the degradation of interface by-products and construct a thinner CEI film for lithium-ion fast conduction. Furthermore, the conformal and complete coating alleviates the structural degradation after the long-term cycle. The above benefits explain the improved performance of PECA modified material and perform well even at high-temperature and high-voltage tests, thus reflecting that the modification strategy provides practical guidance for improving the performance of lithium-ion power batteries.

关键词： Multipoint adsorption Fast ion diffusion Lithium-ion full cell

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A Novel Robust Hybrid control Strategy for a Quadrotor Trajectory Tracking Aided with Bioinspired Neural Dynamics

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APPLIED SCIENCES-BASEL 2024年第20期14卷 9592页

作者： Li, Jianqi Li, Xin Lu, Jianquan Cao, Binfang Sun, Jian Hunan Univ Arts & Sci Hunan Prov Key Lab Control Technol Distributed Ele Changde 415000 Peoples R China Jishou Univ Sch Commun & Elect Engn Jishou 416000 Peoples R China Changsha Univ Sci Technol Sch Elect & Informat Engn Changsha 410114 Peoples R China

This paper introduces a novel hybrid control strategy for quadrotor UAVs inspired by neural dynamics. Our approach effectively addresses two common issues: the velocity jump problem in traditional backstepping control and the control signal chattering in conventional sliding mode control. The proposed system combines an outer-loop bioinspired backstepping controller with an inner-loop bioinspired sliding mode controller, ensuring smooth trajectory tracking even under external disturbances. We rigorously analyzed the system's stability using Lyapunov stability theory. To validate our algorithm's effectiveness, we conducted trajectory tracking experiments in both disturbance-free and step-disturbance conditions, comparing it with the traditional backstepping control, conventional sliding mode control, and saturated sliding mode control. The results demonstrate that our algorithm not only tracks trajectories more effectively but also significantly outperforms these methods in suppressing velocity jumps and signal chattering.

关键词： bioinspired neural dynamics trajectory tracking sliding mode control backstepping control quadrotor control

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A Context Semantic Auxiliary Network for Image Captioning

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INFORMATION 2023年第7期14卷 419页

作者： Li, Jianying Shao, Xiangjun Hunan Univ Arts & Sci Sch Comp & Elect Engn Changde 415000 Peoples R China Key Lab Hunan Prov Control Technol Distributed Ele Changde 415000 Peoples R China Wuhan Univ Sch Comp Sci Wuhan 430072 Peoples R China

Image captioning is a challenging task, which generates a sentence for a given image. The earlier captioning methods mainly decode the visual features to generate caption sentences for the image. However, the visual features lack the context semantic information which is vital for generating an accurate caption sentence. To address this problem, this paper first proposes the Attention-Aware (AA) mechanism which can filter out erroneous or irrelevant context semantic information. And then, AA is utilized to constitute a Context Semantic Auxiliary Network (CSAN), which can capture the effective context semantic information to regenerate or polish the image caption. Moreover, AA can capture the visual feature information needed to generate a caption. Experimental results show that our proposed CSAN outperforms the compared image captioning methods on MS COCO "Karpathy" offline test split and the official online testing server.

关键词： deep learning attention mechanism image captioning

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PEDNet: A Lightweight Detection Network of Power Equipment in Infrared Image Based on YOLOv4-Tiny

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 2023年 72卷 1页

作者： Li, Jianqi Xu, Yaqian Nie, Keheng Cao, Binfang Zuo, Sinuo Zhu, Jiang Xiangtan Univ Coll Automat & Elect Informat Xiangtan 411105 Peoples R China Hunan Univ Arts & Sci Coll Comp & Elect Engn Changde 415000 Peoples R China Xiangtan Univ Key Lab Hunan Prov Internet Things & Informat Secu Xiangtan 411105 Peoples R China Hunan Acad Bldg Res Co Ltd Changsha 410014 Peoples R China Hunan Prov Key Lab Control Technol Distributed Ele Changde 415000 Peoples R China

As a promising and noncontact detection technique, machine vision has been widely used in fault diagnosis of substation equipment. The rapid and accurate detection of substation equipment in infrared images is one of the key steps for automatic fault diagnosis. However, the complexity of image background, the low contrast of infrared images, and the rotational targets in infrared images pose a great challenge to detection task. This study aims to improve the detection accuracy of the model while having real-time detection speed and propose a lightweight power equipment detection network (PEDNet) based on You Only Look Once (YOLOv4)-tiny. First, a novel global information aggregation module (GIAM) is constructed to guide the network to focus on the salient regions where the target equipment is located. Second, an improved spatial transformer network (ISTN) is introduced to reduce the impact of rotational targets on detection accuracy. Finally, a feature enhanced fusion network (FEFN) is designed through the use of a multiscale feature cross-fusion structure. It can fully fuse the feature information of the salient region, the rotational targets, and the strong semantic information. The experimental results show that the proposed PEDNet can reach 92.66% detection accuracy and 107.07 frames/s real-time detection speed on the testing datasets. Compared with YOLOv4-tiny, there is a small sacrifice in detection speed, but the detection accuracy is improved and significantly higher than the existing state-of-the-art (SOTA) object detection models.

关键词： Substations Feature extraction Insulators Computational modeling Autonomous aerial vehicles Task analysis Real-time systems Feature fusion infrared image rotational targets substation equipment unmanned aerial vehicles (UAVs)

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A Nickel-decorated porous graphitized carbon/sulfur cathode enabling excellent cycling stability of all-solid-state lithium-sulfur batteries

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JOURNAL OF eleCTROANALYTICAL CHEMISTRY 2022年 926卷

作者： Zhang, Zhi Fan, Xinming Wu, Min Zhong, Yi Ding, Xiang Luo, Chucheng Chen, Yuandao Huang, Xiaobing Hunan Univ Arts & Sci Coll Chem & Mat Engn Hunan Prov Key Lab Water Treatment Funct Mat Hunan Prov Key Lab Control Technol Distributed Ele Changde 415000 Peoples R China Cent South Univ Sch Met & Environm Changsha 410083 Peoples R China Changzhou Univ Sch Mat Sci & Engn Jiangsu Prov Engn Res Ctr Intelligent Mfg Technol Changzhou 213164 Peoples R China Hunan Kingfuli New Energy Co Ltd Changde 415000 Peoples R China

All-solid-state lithium-sulfur batteries (ASSLSBs) with high theoretical specific capacity and low cost are con-sidered a promising electrochemical energy storage system. However, it suffers from large polarization, low sulfur utilization, and severe capacity decay, owing to the sluggish solid-solid reactions between sulfur and its discharging products (such as lithium sulfide, etc.). Herein, a Nickel-decorated porous graphitized carbon (Ni-PGC) is prepared using a one-step calcination method for the sulfur host in ASSLSBs with PEO-based solid electrolytes. The high specific surface area (638.2 m2/g) of porous carbon structure with sufficient pore volume (0.69 cm3 g-1) could uniformly disperse the active material (Sulfur). The metallic Nickel nanoparticles embed-ding in the porous network could significantly improve the electronic conductivity of composite cathode in ASSLSBs. As a result, the higher electrical conductivity of 8.22 S cm-1 is achieved from the Ni-PGC-S cathode, compared to 0.33 S cm-1 for the amorphous carbon-sulfur cathode. Furthermore, Li' diffusion coefficients (4.19 x 10-11 cm2 s-1 at the cathodic peak of 2.40 V, 7.54 x 10-11 cm2 s-1 at the cathodic peak of 2.05 V, and 2.69 x 10-10 cm2 s-1 at the anodic peak of 2.35 V) of the Ni-PGC-S cathode at 60 degrees C, are 11.11 times, 3.17 times and 2.17 times of the amorphous carbon-sulfur cathode without Ni doping. Therefore, the all-solid-state lithium-sulfur batteries assembled with the Ni-PGC-S cathode exhibit an extraor-dinary initial discharge capacity of 1311.3 mAh/g and a low cycling degradation (0.30 % per cycle) at 60 degrees C and 0.1C. Even at 1C, the battery delivers 375.8 mAh/g after 300 cycles.

关键词： All-solid-state lithium-sulfur batteries Nickel-decorated porous graphitized carbon electronic conductivity Cycling degradation

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Tuning crystal structure of MnO₂ during different hydrothermal synthesis temperature and its electrochemical performance as cathode material for zinc ion battery

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VACUUM 2021年 192卷 110398-110398页

作者： Zeng, Liujing Zhang, Gengbang Huang, Xiaobing Wang, Haiyan Zhou, Tao Xie, Huasheng Cent South Univ Coll Chem & Chem Engn Hunan Prov Key Lab Chem Power Sources Changsha 410083 Peoples R China Hunan Univ Arts & Sci Coll Chem & Mat Engn Hunan Prov Key Lab Control Technol Distributed El Hunan Prov Key Lab Water Treatment Funct Mat Changde 415000 Peoples R China Cangzhou Dahua Grp Co Ltd Cangzhou 061000 Hebei Peoples R China

Rechargeable zinc ion batteries are characterized by low cost, high safety and high specific power, especially mild aqueous Zn-MnO2 battery. Owing to that manganese dioxide with different crystal types has a great impact on its electrochemical performance, it is necessary to understand the crystal structure transformation process of manganese dioxide during synthesis and its effect on the battery property. Here, the crystal structure transformation during different hydrothermal synthesis temperature and related electrochemical performance of MnO2 are researched in detail. It is found that a mixture of ramsdellite (R-MnO2) and Nsutit (gamma-MnO2) can be obtained as the hydrothermal synthesis temperature ranges from 85 degrees C to 145 degrees C. While, a single phase of beta-MnO2 can be observed as the hydrothermal synthesis temperature ranges from 165 degrees C to 185 degrees C. Also, manganese valence increases and BET surface area decreases during the evolution from the mixture of ramsdellite (R-MnO2) and Nsutit (gamma-MnO2) to the final single beta-MnO2 phase. electrochemical performance verifies that the as-prepared MnO2 under the hydrothermal synthesis temperature of 85 degrees C possesses the best rate performance and cyclic property among the as-obtained samples, with a discharge capacity of 50 mAh g(-1) at 2 C, and capacity retention of around 60% after 100 cycles at 0.5 C.

关键词： Manganese dioxide Cathode material Zinc ion battery

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