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Sustainable Power and Energy Conference (iSPEC)

作者： Tiangang Huang State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

The high proportion of renewable energy into the power grid, say, the large-scale wind power generation connected to the power grid, is the key approach to achieve the clean and low-carbon energy transition. Under the premise of ensuring power grid's safe and stable operation, it is necessary to study the influence of wind power capacity expansion on the transient angle stability (TAS). Aiming at several typical dominant modes in Qinghai power system, which holds many new energy resources, the sensitivity of wind power capacity expansion in different locations to the TAS, as well as its key influence factors and feasible explanations, are explored. It may lay the foundation of the location optimization of wind power capacity expansion.

关键词： Stability criteria Wind power generation Power system stability Power grids Transient analysis Thermal stability Optimization

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A Fault Ride-Through Method of Paralleled Synchronous and Virtual Synchronous Generators in Islanded Microgrids

A Fault Ride-Through Method of Paralleled Synchronous and Vi...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Yanfei Ru Feng Zhao Zhangtao Jin State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China College of Electrical and Information Engineering Hunan University Changsha China

ISBN: (纸本)9781665434263

With the development of distributed power generation technologies, parallel operations of virtual synchronous generators (VSGs) and synchronous generators (SGs) become increasingly common in a microgrid. Due to the low overcurrent capacity of VSGs, fault ride-through (FRT) is necessary for microgrids, which makes the transient stability of SG-VSG-based microgrids be different from the traditional power system. In this paper, a new abnormal overcurrent phenomenon caused by FRT is discovered in SG-VSG-based islanded microgrids. Then, characteristics of the output current of the VSG which uses different parameters are compared and analyzed. Furthermore, an optimized FRT method is proposed, which suppresses the abnormal overcurrent. Finally, a simulation is performed to verify the effectiveness of the proposed method on the PSCAD/EMTDC.

关键词： Microgrids System integration Switches Power system stability Synchronous generators Inverters Stability analysis

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Reliability analysis of autonomous controllable protection device in power system 8

Reliability analysis of autonomous controllable protection d...

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8th International Conference on Power Electronics Systems and Applications, PESA 2020

作者： Li, Chen. Yutao, Qiu. Jianing, Chen. Xuliang, Huang. State Key Laboratory of Smart Grid Protection and Control China Co. Ltd Nanjing China State Grid Zhe Jiang Electric Power Co .LTD. China State Grid Zhejiang Electric Power Company Hangzhou Power Supply Company China

ISBN: (纸本)9781728193823

With the deepening of the concept of autonomous control in the power system, more and more attention is paid to the stability of the protection device itself. Compared with the primary equipment condition monitoring, the fault of the secondary protection device will be more concealed. This paper analyzes the factors affecting the reliability of protection devices, forms the life cycle prediction method of substation protection devices, and ensures the safe and stable operation of intelligent substation. Analyzed the reliability of the relay protection device related concepts, from the failure mechanism, through the establishment of joint aging failure based on the Arrhenius model and Weibull distribution model, and based on grid relay protection device, the data is using LM method for joint failure rate estimate the parameters of the model, get old equipment failure rate model of concrete, to determine the reliability of the protection device and the effective service life. An example shows that the model proposed in this paper can effectively predict the failure trend and life boundary of the device, and provide a theoretical basis for the daily maintenance of smart substation. © 2020 IEEE.

关键词： Weibull distribution

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A Measurement Method for Wide-frequency Harmonic Signal in Power grid Based on Window Interpolation FFT and RLS-Adaline Neural Network 2

A Measurement Method for Wide-frequency Harmonic Signal in P...

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2021 2nd International Conference on Electrical, Electronic Information and Communication Engineering, EEICE 2021

作者： Peng, Jiawei Pan, Shuguo Wang, Wenxiu Zhang, Min Shen, Jian Gao, Wang Xia, Chenglin School of Instrument Science and Engineering Southeast University Jiangsu Nanjing210096 China School of Electronic and Information Engineering Jinling Institute of Technology Jiangsu Nanjing211169 China Nari Technology Co. Ltd Jiangsu Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Jiangsu Nanjing211106 China

With the increase of non-linear loads in power grid and the development of power electronics, the growing serious harmonic pollution has put forward higher requirements for the accuracy and real-time performance of the measurement method. For this problem, this paper proposes a wide-frequency harmonic signal measurement method based on window interpolation FFT and adaptive neural network. After the window function is selected, the frequency of harmonic is estimated by double-spectrum-line interpolation algorithm based on three-term third derivative Nuttall window, and then the smoothed frequencies are input into RLS-Adaline neural network to estimate the amplitude and phase of each harmonic. The simulation results show that the proposed method has higher measurement accuracy and stability under few data conditions and low signal-to-noise ratios than conventional window interpolation algorithms. High accuracy measurement of harmonics with short time window in the range of 0∼2.5kHz is effectively realized. © Published under licence by IOP Publishing Ltd.

关键词： Fast Fourier transforms

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Distributed Optimization of Multi-Microgrid Integrated Energy System with Coordinated control of Energy Storage and Carbon Emission

SSRN

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SSRN 2023年

作者： Shi, Linjun Cen, Zimeng Li, Yang Wu, Feng Lin, Keman Yang, Dongmei Lee, Kwang Y. College of Energy and Electrical engineering Hoahai University Jiangsu Nanjing211100 China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing211106 China Department of Electrical & Computer Engineering Baylor University WacoTX76798 United States Yonsei Frontier Lab Yonsei University Seoul03722 Korea Republic of

The mutual optimization of multi-microgrid integrated energy system (MMIES) can effectively improve the overall economic and environmental benefits, which is drawing increasing interest in recent years. Aiming at the scenario where an MMIES is connected to the same node, the energy storage coordination control strategy and carbon emission management strategy are proposed, and an adaptive step-size method is applied to improve the distributed optimization of MMIES based on alternating direction multiplier method (ADMM). Firstly, the basic framework of MMIES containing cold, heat, electricity and gas energy is established, and a coordinated control strategy limiting the time of charge and discharge of energy storage system (ESS) is proposed. Then a multi-objective optimization model based on operating cost and environmental cost about CO2 emissions is formulated. Considering that different microgrids may be managed by different operators and different convergence speed of multi-objective optimization iteration, an adaptive step-size distributed iterative optimization method based on ADMM is used, which can effectively reduce the cost and protect the privacy of each microgrid. Finally, a system composed of three microgrids is taken as an example for simulation analysis. The results of distributed optimization are consistent with those of centralized optimization, and the proposed coordinated control strategy can effectively control the charge and discharge times of ESS, which verifies the effectiveness of the proposed method. © 2023, The Authors. All rights reserved.

关键词： Carbon

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Tracking Status for Hardware-in-the-Loop Simulation Using RTDS

Tracking Status for Hardware-in-the-Loop Simulation Using RT...

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Sustainable Power and Energy Conference (iSPEC)

作者： Qitao Liu Yuqiang Hou Jianbing Xu Yongkang Liu NARI Technology Co. Ltd Nanjing China NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9781665414401

The power system becomes more complex, due to the high penetration of renewable energy and more electronic devices are integrated to the traditional grid. SSCS is the critical task for power grid operation to ensure the control reliability and effectivity. It is inevitable to improve verification experiment technology for SSCS considering the development trend of the power system. RTDS is a powerful simulator for power system which is able to reflects the practical power system operation in real time. In this paper, a method for status tracking of power system model in RTDS is developed that SSCS is able to be verified under multiple operation conditions. It is found that the status cannot be tracked consistently as given, due to the limitations of RTDS models and raw data. The limitation in tracking reactive power output of generators is overcame in this paper. Besides, the development trend of online stability analysis and control is discussed as well as SSCS verification experiment technology.

关键词： Renewable energy sources Reactive power Power system stability Market research Stability analysis Real-time systems Power grids

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Post-Measurement Simulation-Based Pilot protection of Ac Transmission Lines in Wind Farms

SSRN

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SSRN 2024年

作者： Shu, Hongchun Guan, Cheng Dai, Yue Tang, Yutao State Key Laboratory of Collaborative Innovation Center for Smart Grid Fault Detection Protection and Control Jointly Kunming University of Science and Technology Kunming650500 China Faculty of Electric Power Engineering Kunming University of Science and Technology Kunming650500 China Faculty of Land Resources Engineering Kunming University of Science and Technology Kunming650500 China Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology Kunming650500 China

In AC transmission lines within wind farms, fault-induced short-circuit currents pose challenges to traditional protection mechanisms due to their limited magnitude and complex waveforms. To overcome this, a pilot protection scheme based on post-measurement simulation and model matching is proposed. An analysis of conventional protection methods' applicability to wind farm feeder lines is conducted. Using the Bergeron model, current expressions at the midpoint from both wind farm and system sides are derived. Absolute value integration within a short time window is performed. During normal operation or out-of-area faults, output line measurement matches the Belong model, resulting in small integrated current sums. Conversely, intra-area faults exhibit a mismatch, leading to significantly larger integrated current sums. Simulation results confirm robustness against transitional resistances and independence from fault distance and current transformer saturation. Theoretical analysis aligns with practical simulations.© 2017 Elsevier Inc. All rights reserved. © 2024, The Authors. All rights reserved.

关键词： Electric power transmission

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Framework and technologies of App store in new generation power grid dispatching and control system

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Procedia Computer Science 2021年 183卷 754-760页

作者： Qing Zou Guanyu Wu Kun Huang Jing Yu Yuan Gao NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing 211106 China Nari Technology Co. Ltd Nanjing 211106 China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing 211106 China State Grid Jiangsu Elect Power Co. Nanjing 210000 China

In the existing power grid dispatching and control system, the management mechanism of the software version is incomplete; the software quality is difficult to guarantee; the level of automation of the software release is low; the feedback mechanism of the software usage is lacking. So it is difficult to meet the openness requirements of New Generation Power grid Dispatching and control System (NGPGDCS). In this paper, we propose a framework of app store for NGPGDCS, and give some specific introductions to key technologies such as app review and release process, app precise recommendation and download, app intelligent upgrade, and app evaluation feedback. This solution has been piloted in some power grid dispatching and control centers at provincial level and above. Practice has proved that this solution helps to improve the quality of apps, enhance the degree of software automation release, and promote the continuous improvement of the quality of apps.

关键词： app store power grid dispatching control system review release precise recommendation intelligent upgrade evaluation feedback

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Hierarchical annotation method for metal corrosion detection of power equipment

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Journal of Southeast University(English Edition) 2021年第4期37卷 350-355页

作者： Zhang Baili Cao YongZhang Pei Zhang Zhao He Yina Zhong Mingjun School of Computer Science and Engineering Southeast UniversityNanjing 211189China State Key Laboratory of Smart Grid Protection and Control State Grid Electric Power Research InstituteNanjing 211106China NARI Group Corporation Nanjing 211106China Department of Computing Science University of AberdeenAberdeen AB243UEUK

To solve the ambiguity and uncertainty in the labeling process of power equipment corrosion datasets,a novel hierarchical annotation method(HAM)is ***,large boxes are used to label a large area covering the range of corrosion,provided that the area is visually continuous and adjacent to corrosion that cannot be clearly ***,in each labeling box established in the first step,regions with distinct corrosion and relative independence are labeled to form a second layer of nested ***,a series of comparative experiments are conducted with other common annotation methods to validate the effectiveness of *** experimental results show that,with the help of HAM,the recall of YOLOv5 increases from 50.79%to 59.41%;the recall of Faster R-CNN+VGG16 increases from 66.50%to 78.94%;the recall of Faster R-CNN+Res101 increases from 78.32%to 84.61%.Therefore,HAM can effectively improve the detection ability of mainstream models in detecting metal corrosion.

关键词： deep learning Faster R-CNN YOLOv5 object detection hierarchical annotation

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Fast Fault protection Design and control of DC Trnasformer

Fast Fault Protection Design and Control of DC Trnasformer

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Sustainable Power and Energy Conference (iSPEC)

作者： Guoning Wang Zhigang Wang Xiaoming Zeng Yongwei Wang Weimei Ge State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (State Grid Electric Power Reasearch Insitute) Nanjing China State Grid Xinyuan Company Shandong TaIshan Pumped Storage Power Station Co. LTD Tai’an China

ISBN: (纸本)9781665414401

With the diversification of loads and the development of distributed energy, DC system and DC transformer attracted more and more attention in modern power system. However, bipolar short-circuit faults threatened the safety of DC power system operation due to the surge current caused by them. When DC transformer low voltage output has short circuit fault, it must block fault current quickly. This paper proposed a fault protection control method in DC transformer. Through the design and control, the fault current can be quickly blocked, and the fault current output can be maintained to support the rapid recovery of the system. After adding the fault protection circuit and control in DC transformer, the protection performance is greatly improved. Finally, the real-time simulation of RTDS verifies that the proposed short-circuit protection current-limiting control can well achieve the design goals.

关键词： Low voltage Conferences Fault protection Surge protection Transformers Real-time systems Safety

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