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Asia Conference on Energy and Environment Engineering (ACEEE)

作者： Kexin Yang Yanhong Bao Xiancheng Ren Feng Wu Jinlong Zhang NARI Technology Co. Ltd. Nanjing Normal University Nanjing China NARI Technology Co. Ltd. State Key Laboratory of Smart Grid Protection and Control Nanjing China

With the gradual increase in the proportion of new energy generation, grid-forming control with dynamic regulation and support capability of frequency and voltage has become a research hotspot. However, the current-limiting control of the converter reduces the transient stability margin and leads to the complex evolution of the transient instability mode, which poses a great challenge to the stable operation of new energy units. In this paper, the influence of different current limiting strategies on the transient stability of the single-loop voltage-magnitude controlled grid-forming converter is analyzed, and three typical instability evolution modes are summarized. Further, the influence law of virtual inertia and damping parameters on the transient stability is analyzed by critical clearing angle (CCA), and critical clearing time (CCT), the mechanism of abnormal phenomena of virtual inertia and damping parameters on transient stability is revealed based on the equal area criterion, and the conditions for abnormal phenomena are clarified, finally, the transient instability evolution modes and the mechanism of abnormal phenomena is verified by electromagnetic transient time domain simulation.

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Transition Metal (AU, Ag, Pt, Pd, Ni) Doped MoS2 as Gas Sensing Materials for C4F7n Leakage Detection: A Comparative Study

SSRN

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SSRN 2023年

作者： Yan, Yongxu Li, Yi Zhang, YiFan Wu, Peng Tang, Ju Zhang, Xiaoxing Xiao, Song State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and Automation Wuhan University Wuhan China Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of Technology Wuhan430068 China

Fluorinated nitrile (C4F7N) has been considered a novel eco-friendly gas insulating medium, while the low toxicity and leakage risk urgently urge the development of C4F7N gas sensor. Herein, we analyzed the sensing performance of transition metal doped MoS2 to C4F7N based on the density functional theory (DFT). The adsorption energy, charge transfer, deformation charge density and density of states were explored. Furthermore, the sensitivity and recovery performance were analyzed based on frontier orbital and transition state theories. It was found that Pd-MoS2 can achieve a superior balance between sensitivity and response time, showing promising potential for C4F7N leak detection for engineering applications. © 2023, The Authors. All rights reserved.

关键词： Density functional theory

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A Cooperative Development Path in Distribution Networks with Distinct Ownership Based on System Dynamics

A Cooperative Development Path in Distribution Networks with...

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Power and Electrical Technology Conference (APET), Asia

作者： Jianfu Ni Feng Liang Tianying Yu Qingsheng Xiong Jinda Zhu R&D Department in NARI Technology NARI Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China Smart Grid Key Laboratory of Shaanxi Province Xi’an Jiaotong University Xi’an China

The system dynamics is an effective tool to study the internal evolution mechanism of a system. In this paper, a distinct ownership interaction causal loop diagram of the distribution network is established by sorting out the relationship chain between distributed PV, distributed gas units, distributed energy storage, distribution company and residents. The distinct ownership co-evolution model of distribution network is further established, and the boundary conditions of distributed power supply construction of distribution network are obtained by analyzing the distribution network test case. The effective path to achieve the dual carbon target is verified.

关键词： Analytical models Power supplies System dynamics Power distribution Distribution networks Carbon dioxide Companies

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A Top-k QoS-Optimal Service Composition Approach Under Dynamic Environment 7th

A Top-k QoS-Optimal Service Composition Approach Under Dynam...

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7th International Conference on Artificial Intelligence and Security, ICAIS 2021

作者： Tian, Cheng Zhang, Zhao Yang, Sha Huang, Shuxin Sun, Han Wang, Jing Zhang, Baili School of Computer Science and Engineering Southeast University Nanjing211189 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China Nari Group Corporation Nanjing211106 China

ISBN: (纸本)9783030786083

To deal with low efficiency of existing Web service composition algorithms under dynamic environment, this paper proposes a Top-k QoS-optimal service composition algorithm based on QWSC-K static algorithm. The algorithm first considers the influence of dynamic environment on the existing service composition and service dependency graph, and classifies the changed services in dynamic environment. Moreover, different strategies are adopted to obtain the intermediate results of service composition for different categories of services. The influence of different service categories on the service dependency graph is analyzed to realize the updating of the service dependency graph. Finally, based on the updated service dependency graph and the intermediate results of the service composition, the adaptive incremental update can be applied to change the original service composition results, avoiding the time-consuming re-query process. Experiments show that the algorithm is efficient and accurate in dynamic environment. © 2021, Springer Nature Switzerland AG.

关键词： Quality of service

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A Flame Detection Algorithm Based on Improved YOLOv3 and Thermograph Generation 5

A Flame Detection Algorithm Based on Improved YOLOv3 and The...

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5th International Conference on Computing and Big Data, ICCBD 2022

作者： Zhang, Yong Zhang, Jiaqing Zhang, Jianhua Xing, Weijie Xcmg Fire-fighting Safety Equipment Co. Ltd. Xuzhou China State Grid Anhui Electric Power Research Institute Anhui Province Key Laboratory of Electric Fire and Safety Protection Hefei China School of Information and Control Engineering China University of Mining and Technology Xuzhou China

ISBN: (纸本)9781665457163

Aiming at the low accuracy of flame detection in complex environment, a new flame detection method based on improved YOLOv3 and gray thermograph is proposed. For the insufficient thermograph of actual flame data sets, a temperature filling algorithm based on radial basis function is proposed. Based on the open data sets, the actual flame image and thermograph are added to build the initial flame data sets, which improves the model training efficiency and generalization performance. The obtained flame gray scale thermograph and R, G, B image are combined to form a four-channel data and input into the improved YOLOv3 network convolution network layer to obtain the multi-channel characteristics of the data. The experimental results on public and self-built data sets show that the algorithm combines gray thermal image to expand image data and improves the detection accuracy of flame recognition. © 2022 IEEE.

关键词： Image enhancement

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Study on the corresponding relationship between critical points of P-V Curve and V-Q curve of simple thevenin equivalent system 1

Study on the corresponding relationship between critical poi...

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1st IEEE China International Youth Conference on Electrical Engineering, CIYCEE 2020

作者： Li, Xuan Li, Zhaowei Guan, Linlin Wu, Xuelian Mei, Yan Li, Jun State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and Operation Control Nanjing211106 China

ISBN: (纸本)9781728196596

With the further increase in power demand for highly concentrated load centers and the gradual formation of a power system with a high proportion of new energy sources, China will face severe risk of voltage instability. In this paper, firstly, the load bus voltage equation of simple Thevenin equivalent system is derived, and then the P-V and V-Q curves are obtained respectively. Secondly, the mutual restriction relationship between active and reactive power of load is discussed when there is a real value solution to the voltage. Finally, the relationship between the voltage of critical points of the P-V curves and the reactive power of the load, and the relationship between the voltage of critical points of the V-Q curves and the active power of the load are deduced respectively. The relationship of one-to-one correspondence between critical points of P-V curves and critical points of V-Q curves is proved according to the mutual restriction between active power and reactive power of load and monotonicity of critical voltage and load power function. © 2020 IEEE.

关键词： Reactive power

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Optimal Phase Switch Device Placement Scheme for Low Voltage Distribution Network Considering Load and Renewable Energy Uncertainty

Optimal Phase Switch Device Placement Scheme for Low Voltage...

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Power and Electrical Technology Conference (APET), Asia

作者： Feng Liang Jianfu Ni Hao Zhu Qingsheng Xiong Zhuofei Yu R&D Department in NARI Technology NARI Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China Smart Grid Key Laboratory of Shaanxi Province Xi’an Jiaotong University Xi’an China

With the increase of single-phase devices and loads in the power system, the three-phase unbalance problem of the low voltage distribution network is more serious. Besides, the intermittency and volatility of renewable energy increase system uncertainty. To address this issue, this paper proposes a phase switch device placement model for the low voltage distribution network with renewable energy sources. The proposed model combines network reconfiguration and phase switch device to mitigate the three-phase unbalance. Considering the uncertainty of loads and renewable energy output, the proposed model is formulated as a mixed integer linear programming model based on stochastic programming, which can be solved by general commercial solvers and find the global optimal solution. The effectiveness of the proposed model is validated on the IEEE 13 node test feeder. The results show that the proposed model can significantly mitigate the three-phase unbalance of low voltage distribution network.

关键词： Renewable energy sources Low voltage Uncertainty Stochastic processes Switches Distribution networks Programming

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New Intelligent Sensing Terminal System Architecture of Internet of Things

New Intelligent Sensing Terminal System Architecture of Inte...

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International Conference on Internet of Things, Communication and Intelligent Technology, IoTCIT 2022

作者： Zhou, Lidan Li, Jing Yao, Gang Wang, Hongyu Li, Jian Liu, Siyang Nie, Yongjie School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai Minhang District200240 China Wiscom System Co. LTD. Nanjing China State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing400044 China Electric Power Research Institute Yunnan Power Grid Co. Ltd. Yunnan Kunming650217 China Yunnan Key Laboratory of Green Energy Electric Power Measurement Digitalization Control and Protection Yunnan650217 China

ISBN: (纸本)9789819904150

In view of the fragmentation of the functions, forms and basic software and hardware of the existing IoT terminals, we propose an IoT intelligent sensing terminal system architecture, in which the intelligent sensing layer collects external data and information and transmits it to the computing fusion collaboration layer for data processing, fusion and task collaboration. The local application layer generates processing results and interacts with the cloud application layer through the communication layer. The new intelligent sensing terminal system of the IoT has an integrated local four-tier architecture, which can meet the needs of the large-scale development of the IoT. In addition, it can work uniformly under the control of the cloud, or complete the underlying tasks independently. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Internet of things

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Reliability Evaluation of Electronic Cabin Smoke Detector Based on FMEA and Arrhenius Mode 12

Reliability Evaluation of Electronic Cabin Smoke Detector Ba...

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12th IEEE Global Reliability and Prognostics and Health Management, PHM-Nanjing 2021

作者： Sul, Yan Liang, Xuerui Wen, Tan Civil Aviation College Nanjing University Of Aeronautics And Astronautics China State Key Laboratory Of Smart Grid Protection And Control Nanjing China Civil Aviation College Nanjing University Of Aeronautics And Astronautics Nanjing China

ISBN: (纸本)9781665401302

The high reliability of smoke detectors in the electronic cabin of passenger aircraft is of great significance for reducing the false alarm rate of smoke detection and ensuring the safety of passenger aircraft and passengers. In order to analyze and evaluate the reliability of newly developed smoke detectors, a set of reliability evaluation methods for electronic cabin smoke detectors based on FMEA (failure mode and impact analysis) and Arrhenius models are presented. First of all, based on the principle of the system, the FMEA method is used to analyze and determine the potential failure location, potential failure mode and failure reason of the smoke detector. Then, the RPN (Risk Coefficient) evaluation method based on the expert scoring method determines the priority ranking of failure risks, establishes risk evaluation indicators, conducts risk evaluation on failure modes, and determines high-risk stresses. Finally, for the high-risk stress, a life prediction of the smoke detector in the electronic cabin based on the Arrhenius model is established. The feasibility and effectiveness of the above reliability evaluation method are verified and analyzed by taking a smoke detector in the electronic cabin of a certain type of passenger aircraft as an example. © 2021 IEEE.

关键词： Risk assessment

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Comprehensive Evaluation Index System and Method for Reactive Power Support Capability of Wind/Photovoltaic/Storage Power Stations

Comprehensive Evaluation Index System and Method for Reactiv...

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IEEE International Conference on Cyber Technology in Automation, control, and Intelligent Systems

作者： Jinyuan Fang Kai Hou Yingwei Jiang Bingtuan Gao Guozhong Zhang Xuewei Shi School of Electrical Engineering Southeast University Nanjing Jiangsu China State Key Laboratory of Smart Grid Protection and Control Nanrui Group Co. Nanjing Jiangsu China State Grid Hebei Zhangjiakou Scenery Storage and Transmission New Energy Co. Ltd Zhangjiakou Hebei China

High proportion of renewable energy integrated into the power grid results in lower system inertia and deterioration of voltage characteristics. Understanding the reactive power support characteristics of wind/photovoltaic (PV) /storage power station is critical for achieving coordinated control of their reactive power. In this regard, the paper proposes a comprehensive evaluation index system that considers voltage, reactive power support, and reactive power control to evaluate the reactive power support capability of wind/photovoltaic/storage power station. To validate the effectiveness of the index system, this paper constructs a simulation scenario of a wind/photovoltaic/storage power station connected to the regional power grid and calculates the corresponding indices. The fuzzy membership function is used to normalize the indicators. The subjective and objective combination weighting method is used to assign values to the indicators, and the reactive power support capability ratings of each power station are calculated. Finally, the reactive power support capability of the wind/photovoltaic/storage power plant was analyzed in combination with simulation scenarios, and the effectiveness of the comprehensive evaluation index system and method was verified.

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