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10th International Forum on Electrical Engineering and Automation, IFEEA 2023

作者： Zhou, Zhuomin Liang, Jian Yu, Aiqin Qin, Zhengbin Liu, Haotian Sheng, Yanchao Guo, Wei State Grid Hunan Electric Power Company Limited Hunan Key Laboratory of Energy Internet Supply Demand and Operation Development Planning Department Changsha China State Grid Hunan Electric Power Company Limited Institute of Economic Research Hunan Key Laboratory of Energy Internet Supply Demand and Operation Changsha China State Grid Xiangtan Electric Power Company Limited Institute of Economic Research Changsha China Three Gorges Intelligent Industrial Control Technology Co. Ltd. R&d Department Wuhan China

ISBN: (纸本)9798350309379

The main technical issues for small hydropower currently are aging equipment and insufficient intelligence level, which cannot effectively support the development of new power systems. To solve this problem, this paper proposes an end-edge-cloud technology architecture for intelligent control of small hydropower. Specifically, an intelligent sensing architecture for small hydropower units is proposed, which can fully sense the operating conditions of small hydropower units. An edge computing PLC with IOT functions is proposed, which can effectively integrate the speed regulation, excitation, monitoring and protection algorithms of small hydropower units, and can greatly simplify the complexity of control systems. At the same time, the edge computing PLC transmits the on-site operation data to the cloud platform through high-density compression transmission, and uses big data analysis and processing technology to realize centralized monitoring and remote operation and maintenance of small hydropower stations within the province. Finally, the intelligent sensing, integrated edge control device and cloud platform proposed in this paper are technologically verified at a small hydropower station in Jingshan Reservoir, and the results fully demonstrate the effectiveness of this technical architecture. © 2023 IEEE.

关键词： control end-edge-cloud technology architecture IOT-PLC small hydropowert

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Thermal simulation optimization of DC charger based on ANSYS Icepak 14

Thermal simulation optimization of DC charger based on ANSYS...

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14th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Hangzhou 2023

作者： Wang, Yu Zhou, Feiyu Wen, Tan Su, Yan Yuan, Li Wang, Ke State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China Nanjing University of Aeronautics and Astronautics College of Civil Aviation Nanjing China State Grid Electric Power Research Institute Nanjing China

ISBN: (纸本)9798350301359

As one of the most important charging facilities for electric vehicles, DC chargers provide power supplements for electric vehicles. With the continuous development of DC chargers, the power density of their internal functional modules is also increasing. It is urgent to choose a reasonable heat dissipation method to reduce the overall temperature rise inside the DC charger and ensure its safe operation. In this paper, the 80kW DC charger is taken as the research object, and based on ANSYS Icepak thermal simulation software, the internal temperature field and fluid field of the DC charger are simulated and analyzed, and the design scheme of the DC charger is optimized by studying the heat dissipation system. Finally, the optimization scheme of the air duct structure of the system is obtained by adjusting the position of the heat dissipation fan. © 2023 IEEE.

关键词： ANSYS Icepak DC charger heat dissipation temperature thermal simulation

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intelligent Pre-warning Method of Transmission Line Icing Based on Stack Denoising Autoencoder 5th

Intelligent Pre-warning Method of Transmission Line Icing Ba...

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Proceedings of the 5th International Conference on Clean Energy and Electrical Systems - Proceedings of CEES 2023

作者： Wang, Chunyi Liu, Wei Zhou, Heng Liu, Yutian Shandong Electric Power Company State Grid Shandong Jinan250001 China Weihai Power Supply Company State Grid Shandong Weihai264200 China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Shandong Jinan250061 China

ISBN: (纸本)9789819938872

In order to reduce the impact of transmission line icing on the secure operation of power grid in extreme weather, an online pre-warning method based on stack denoising autoencoder (SDAE) is proposed in this paper. First, considering deicing phenomenon, geographical factors and current thermal effect under different operating conditions, sample selection, data revision and sample cluster are carried out. Then, the prediction model of ice thickness growth based on SDAE is established and trained off-line. Finally, the icing trend is evaluated according to the real-time weather information, and combining with the current data as well as the cumulative effect of time, the line ice thickness is predicted online so as to conduct ice severity pre-warning. The simulation results demonstrate that the proposed method can improve the noise adaptability and prediction accuracy. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Electric lines

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Spatial-Temporal Attention Mechanism and Graph Convolutional Networks Based Distributed PV Ultra-short-term power Forecasting

Spatial-Temporal Attention Mechanism and Graph Convolutional...

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2023 IEEE International Conference on Energy Technologies for Future grids, ETFG 2023

作者： Liu, Xinyu Xie, Xu Fang, Qin Xu, Fei Huang, Chen Zhen, Zhao Wang, Fei State Grid Chongqing Electric Power Company Chongqing400015 China Shinan Power Supply Branch State Grid Chongqing Electric Power Company Chongqing China Tsinghua University State Key Laboratory of Power System Operation and Control Beijing100084 China North China Electric Power University Department of Electrical Engineering Baoding071003 China

ISBN: (纸本)9781665471640

To ensure the efficient operation and healthy development of photovoltaic power generation systems, reliable distributed photovoltaic power prediction is significant. However, the lack of modeling ability of existing distributed photovoltaic power forecasting methods for dynamic spatiotemporal correlation of distributed photovoltaic power data limits the further improvement of prediction accuracy. Therefore, a distributed photovoltaic ultra-short-term power forecasting method based on spatial-temporal attention mechanism and graph convolutional networks is proposed in this paper. Firstly, distributed photovoltaic cluster is divided into sub-regions and graph structured data can be generated with each sub-region being a node on the graph. Then, spatial-temporal attention mechanism is used to adaptively capture spatiotemporal correlation information and dynamically update adjacency matrix. Finally, spatial-temporal convolution is used to extract deep spatiotemporal features of distributed photovoltaic power data and achieve regional power prediction. The validity and progressiveness of the model have been verified in real world data sets. © 2023 IEEE.

关键词： distributed photovoltaic graph convolutional networks spatial-temporal attention mechanism ultra-short-term power forecasting

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Fully Distributed Economic Dispatch for Cyber-physical power System with Time Delays and Channel Noises

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Journal of Modern power Systems and Clean Energy 2022年第6期10卷 1472-1481页

作者： Yuhang Zhang Ming Ni Yonghui Sun College of Energy and Electrical Engineering Hohai UniversityNanjing 210098China NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing 211106China NARI Technology Co. Ltd.Nanjing 211106China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106China

Economic dispatch problem(EDP)is a fundamental optimization problem in power system operation,which aims at minimizing the total generation *** fact,the power grid is becoming a cyber-physical power system(CPPS).Therefore,the quality of communication is a key *** this paper,considering two important factors,i.e.,time delays and channel noises,a fully distributed consensus based algorithm is proposed for solving *** critical maximum allowable upper bounds of heterogeneous communication delays and self-delays are *** should be pointed out that the proposed algorithm can be robust against the time-varying delays and channel noises considering generator *** addition,even with time-varying delays and channel noises,the power balance of supply and demand is not broken during the *** simulation studies are presented to validate the correctness and superiority of the developed results.

关键词： Distributed economic dispatch consensus-based algorithm cyber-physical power system time delay channel noises

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Design and Verification of a DC Direct-mounted Energy Storage Topology

Design and Verification of a DC Direct-mounted Energy Storag...

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IEEE Information Technology, Networking, Electronic and Automation control Conference

作者： Junwei Huang Wujie Chao Chaoping Deng Liyu Dai Jinke Wang Electric Power Research Institute of State Grid Fujian Electric Power Co. Ltd. Fuzhou China Fujian Key Laboratory of Smart Grid Protection and Operation Control Fuzhou China

ISBN: (数字)9798350370805

ISBN: (纸本)9798350370812

The modular multilevel converter based battery energy storage system (MMC-BESS) has the problem of pulsating current affecting battery life, and the high cost of retrofitting traditional modular multilevel converter (MMC) stations. The proposed DC direct-mounted energy storage topology in this paper is battery friendly and required number of battery cells is only 1/6 of MMC-BESS, greatly saving costs. This paper analyzes the topology structure and working principle of DC direct-mounted energy storage devices, and proposes a design method for the DC direct-mounted energy storage devices. The proposed design method is validated through simulation and prototype experiments. The simulation and construction of a DC 750V prototype have verified that the prototype has achieved good charging and discharging functions for DC energy storage, with small fluctuations in DC grid connected current and good power control effect. This study can provide reference and guidance for the design and application of high-voltage and high-capacity direct current energy storage devices that support offshore wind power to move towards the deep sea in the future.

关键词： Multilevel converters Fluctuations Costs power control Prototypes High-voltage techniques Wind power generation Topology Batteries Energy storage

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Self-organizing Network of Self-energy Sensors for Transmission Line Status Monitoring 4

Self-organizing Network of Self-energy Sensors for Transmiss...

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4th International Conference on Advances in Electrical Engineering and Computer Applications, AEECA 2023

作者： Feng, Bo Zhang, Wei Xia, Xiaofei Tang, Jie Liu, Peng Guangxi Key Laboratory of Intelligent Control and Operation and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Co. Ltd. Guangxi Nanning China Guangxi Power Grid Equipment Monitoring and Diagnosis Engineering Technology Research Center Electric Power Research Institute of Guangxi Power Grid Co. Ltd. Guangxi Nanning China Guagnxi Power Grid Co. Guangxi Nanning China

ISBN: (纸本)9798350308082

Transmission line condition monitoring sensor network is large in scale and difficult to maintain. Its long chain network topology is different from that of general wireless sensor networks. It is necessary to develop a self-organizing sensor network with self-energy harvesting. In this regard, a three-layer network model is designed. Three types of node models are constructed. The sensor nodes implement round-robin sleep/wake and energy management mechanisms, powered by self-harvested energy. Additionally, reliable routing between nodes is established. Simulation results show that the developed simulation model is suitable for the application of transmission line condition monitoring. The expected functions of each module have been basically realized, and the stable and reliable transmission of perceived data of key components of transmission lines has been achieved, thereby providing technical and data basis for the deployment of practical networks. © 2023 IEEE.

关键词： Electric lines

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Study on the excitation inrush suppression strategy of phase-selective switching converter with closing resis-tor switch considering dispersion 10

Study on the excitation inrush suppression strategy of phase...

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10th China International Conference on Electricity Distribution, CICED 2022

作者： Liu, Zhijiang Lin, Xuehua Huang, Libin Li, ShuYong State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid. Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China

ISBN: (数字)9781665452687

ISBN: (纸本)9781665452687

A detailed analysis of the excitation inrush current bias phenomenon in the event is carried out in the context of a certain time when charging of a converter is carried out in an ultra-high voltage DC project of the Southern China power grid to obtain the cause of the event, which is confirmed by RTDS tests. By analysing the relationship between the moment of closing of different auxiliary contacts and the intermittent angle of the excitation inrush current, the shortest input time at which the closing resistance can play a role in weakening the excitation inrush current is proposed at different moments of closing. Finally, considering the discrete nature of circuit breaker closing, the proposed closing resistor best access time and the best closing angle, the effectiveness of the proposed strategy is verified by simulation tests. © 2022 IEEE.

关键词： Electric circuit breakers

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Fuzzy Adaptive PI Circulating Current Suppressing control for MMC-HVDC

Fuzzy Adaptive PI Circulating Current Suppressing Control fo...

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IEEE Information Technology, Networking, Electronic and Automation control Conference

作者： Wujie Chao Junwei Huang Chaoping Deng Liyu Dai State Grid Fujian Electric Power Research Institute Fuzhou China Fujian Key Laboratory of Protection and Operation Control for Smart Grid China

Recent years, modular multilevel converter (MMC) is one of the most promising topologies applied to high voltage direct current transmission (HVDC). In order to solve the circulating currents caused by structural defects of MMC, a fuzzy adaptive PI circulating current suppressing controller is proposed based on mathematical model of MMC and functioning fuzzy subset inference method: The fuzzy number is calculated according to the error of system state, error variation, membership function and fuzzy control rules; The center of gravity method is used for defuzzification, and finally the PI parameters are modified. Finally, the PSCAD/EMTDC simulation model with fuzzy adaptive PI controller is established. The results show that the fuzzy adaptive PI circulating current suppressing controller is effective for MMC-HVDC.

关键词： Adaptation models Multilevel converters PI control HVDC transmission High-voltage techniques Mathematical models Stability analysis

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Nonlinear Modeling of the VSC grid-Connected System with controller Saturation 4

Nonlinear Modeling of the VSC Grid-Connected System with Con...

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4th International Conference on Electrical Engineering and control Technologies, CEECT 2022

作者： Yu, Jiawei Zhu, Yihua Li, Chengxiang Luo, Chao State Key Laboratory of Hvdc Electric Power Research Institute China Southern Power Grid China National Energy Power Grid Technology R&d Center Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China Csg Key Laboratory for Power Sytem Simiulation ELectic Power Reasearch Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781665498999

With the development of power electronics technology, the power system is now evolving into a new-generation power system dominated by renewable energy. Due to the physical limitations of power electronics, controller saturation is widely adopted in wind turbines and photovoltaics. In this paper, a nonlinear system model considering output saturation is proposed in the view of general dynamic systems. By defining saturation-activation vector L, all the saturations of the system are uniquely represented. Then, the proposed modeling method is applied to a voltage source converter (VSC) grid-connected system. Based on RTDS simulation, this paper revealed that a class of oscillations at a specific frequency are caused by the activation of the phase-locked loop (PLL) saturation. The frequency of the oscillation depends on the top and bottom boundaries of PLL saturation. © 2022 IEEE.

关键词： Chemical activation

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