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International Conference on Power System Technology (POWERCON)

作者： Huirong Liu Yuping Zheng Tonghua Wu Feng Hong Wei Dai Xindong Li State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China

ISBN: (纸本)9781665407380

Capacitance current has significant effect on long-distance fault of high-voltage transmission line, and the current single-ended quantity location algorithm can hardly eliminate the effect of capacitance current under the power frequency. To reduce capacitance current’s effect on location algorithm, this paper builds metallic grounding fault model based on RLC type circuit, takes fault location as the unknown variable, builds a mathematical location model within time domain applicable for taking account of capacitance current, and obtains the quadratic equation with one unknown for fault location. Then it substitutes the two independent variables for the linear term and quadratic term, solves independent variables through linear equation, and proves the solution exists and is unique. Then under analysis on the same difference error, it compares magnitude of error generated during calculation of the two independent variables, it corrects difference error first, and inversely solves fault location by selecting the numerically disturbed smaller independent variable. Simulation results indicate the algorithm can accurately take account of effect of capacitance current under different metallic fault conditions, and solve fault location in a stable and accurate manner.

关键词： Time-frequency analysis Power transmission lines Simulation RLC circuits Fault location Capacitance Mathematical models

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Frequency Regulation Market Performance Considering the Complementarity of Wind Park Cluster

Frequency Regulation Market Performance Considering the Comp...

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

作者： Zirui Huang Jiangfeng Zhang Xianliang Teng Kaifeng Zhang School of Automation Southeast University Nanjing China State Grid Zhejiang Electric Power Research Institute Zhejiang China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China

Modern power systems with high penetration of renewable energy enrich the frequency regulation resources by offering more new clean wind and solar energy. In this paper, we present a bottom-top design of wind park’s participation in the frequency regulation market considering the complementarity of wind park power outputs. By defining a quantitative complementarity index, we show how the complementarity contributes to the regulation reserve reliability of wind parks and the consistent market performance, and verify the conclusions via numerical analysis.

关键词： Wind Renewable energy sources Wind energy System integration Solar energy Regulation Power system reliability

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A Coordinated MMC control Strategy of Integrated Photovoltaic/Battery System

A Coordinated MMC Control Strategy of Integrated Photovoltai...

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IEEE International Conference on Energy Internet (ICEI)

作者： Yuexi Yang Xiao Zhou Sichao Wang Chunpeng Li Junwei Huang Wenzheng Xu State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co.Ltd. Beijing China Fujian Key Laboratory of Protection and Operation Control for Smart Grid State Grid Fujian Electric Power Research Institute. Fuzhou China National Research Center for Active Distribution Network Technology Beijing Jiaotong University. Beijing China

The grid-connecting control and maximum power point tracking control of photovoltaic inverters have long been the research focus in the field of solar power generation. In this paper, a new coordinated modular multilevel converter (MMC) control strategy based on virtual synchronization and MPPT is proposed for grid-connected inverters in the PV/Battery system. The proposed strategy realizes frequency and voltage droop control with the synchro's inertia and damping characteristics, and improves the power angle stability as well as system voltage stability. Simulation results in MATLAB/Simulink verifies the feasibility and effectiveness of the proposed control strategy.

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Research on Dead-Time Compensation Method for Low Voltage Delta Connected Induction Motor 1

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Yong, Tao Liu, Jing Liu, Yechun Tang, Mengyang Qiao, Hui Miao, Yiru Key Laboratory of Smart Grid and Intelligent Control of Nanchong Southwest Petroleum University Nanchong637001 China State Grid Jiangsu Electric Power Co. LTD. Extra-High Voltage Branch Company Nanjing211002 China College of Electrical and Information Engineering in Hunan University Changsha410082 China The Sixth Design Institute of Machinery Industry Co. Ltd. Zhengzhou450007 China

ISBN: (数字)9789819904082

ISBN: (纸本)9789819904075

Low voltage as 48 V and large power induction motor will be largely used in hybrid and pure electric vehicle (EV) because of its very high safety. But the winding cables are so thick that assembly of neutral point is very inconvenient and delta connection has to be applied. However, some new problems such as loop current, harmonics, dead-time arise with delta connection. Aiming at the dead-time problem of this induction motor, the characteristics of dead time effect were analyzed in detail, and the two phases average voltage compensation method was derived. Analysis indicate that voltage error caused by snubber circuit under small current leads to the current to be clamped in the vicinity of zero, and presents a compensation method for this error. The earlier crossing zero compensation and a simple method to determine the direction of current are presented to solve zero current clamping effect and the complicate algorithms are avoided. The simulation and experiment results verify the validity and feasibility of these methods. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Induction motors

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Impact of Generation Companies' Heterogeneous Investment Behaviors on the Effects of Non-fossil Energy Incentive Policies

Impact of Generation Companies' Heterogeneous Investment Beh...

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2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Cai, Bin Li, Tianran Wang, Kui Li, Zhiyuan Zhu, Lei Wen, Jun Xue, Yusheng Nari Group Corporation State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and Control Nanjing China Integrated Energy of Jiangsu Province Nanjing Normal University Nari School of Electrical and Automation Engineering Engineering Laboratory of Gas-Electricity Nanjing China China Huaneng Group Co. Ltd Beijing China

ISBN: (纸本)9781665414395

The incentive policies for non-fossil energy are important factors affecting the investment behavior of generation companies (GENCOs). However, the investment behavior of different types of GENCOs in the system could be quite different, so the implementation of the policy must consider how to achieve incentive compatibility with the investment behavior of GENCOs. This article constructs a power transition simulation model that considers the investment behavior of GENCOs. Taking the wind power feed-in tariff policy as an example, it analyzes the impact of policy on the whole system's low carbon transition pathway of the power structure and the evolution trajectory of system carbon emissions under different behavior scenarios. © 2021 IEEE.

关键词： Investments

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A Web Attack Detection Method Based on DistilBERT and Feature Fusion for Power Micro-Application Server

A Web Attack Detection Method Based on DistilBERT and Featur...

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Advanced Electronics, Electrical and Green Energy (AEEGE), International Conference on

作者： Li Nige Chen Lu Zhao Lei Teng Zhenning Wang Zhiqiang Shao Yiyang Gui Xiaolin State Grid Smart Grid Research Institute Co. Ltd. State Grid Laboratory of Power cyber-Security Protection and Monitoring Technology Nanjing China Shaanxi Province Key Laboratory of Computer Network Faculty of Electronic and Information Engineering Xi’an Jiaotong University Xi’an China

The widespread use of power micro-applications has significantly expanded the attack surface of their server side, thus increasing the risk of vulnerability attacks such as SQL injection, XSS, and CRLF injection. To ensure the security of power systems, these attacks must be detected precisely and timely. Therefore, this paper proposes a server-side web attack detection method based on DistilBERT and feature fusion for HTTP and HTTPS requests. The method treats HTTP and HTTPS requests as text data, specifically, extracts deep semantic features using DistilBERT, and fuses them with well-designed empirical features to comprehensively characterize and classify the request. Consequently, anomalous requests can be detected. The experimental results show that the accuracy, precision, recall, and F1 score of the method on HTTP CSIC 2010 and FWAF datasets are close to or higher than 99%. Compared with other methods as far as we known, this method has better performance and efficiency.

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Remote Attestation for Intelligent Electronic Devices in smart grid Based on Trusted Level Measurement

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Chinese Journal of Electronics 2020年第3期29卷 437-446页

作者： WANG Yong LI Jun'e CHEN Xiong LIN Hai YU Fajiang LUO Jianbo Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of EducationSchool of Cyber Science and Engineering Wuhan University NARI Group Corporation State Grid Electric Power Research Institute NARI Technology Co.Ltd. State Key Laboratory of Smart Grid Protection and Control

To reduce the implementation complexity and excessive overhead caused by remote attestation,we propose a new remote attestation scheme based on trusted level measurement considering the limited system resources of the Intelligent electronic devices(IEDs) in smart grid. In this scheme, a lightweight trusted level measurement mechanism is designed, and a new dynamic weighted multi-classifier integration method based on Binary tree Support vector machine(BT-SVM) is proposed. The trusted level of configuration information and running state of an IED are measured through trusted third party. The measurement parameters and attestation period are dynamically adjusted according to different trusted levels of an IED, so that reducing computational overhead and communication delays in remote attestation process. Analysis and experiments show that the proposed scheme can enhance the security of IEDs in smart grid by occupying a small amount of computation and communication resources.

关键词： smart grid Intelligent electronic devices(IEDs) Remote attestation Trusted level measurement

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Analysis of Wide-Band Oscillation Characteristics of Rudong Offshore Wind Farm Connected to the grid Through VSC-Based DC Transmission System 7

Analysis of Wide-Band Oscillation Characteristics of Rudong ...

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7th Asia Conference on Power and Electrical Engineering, ACPEE 2022

作者： Chen, Zhitong Li, Guojie Kong, Xiangping Zhang, Chi Bin, Zijun Xu, Jin Key Laboratory of Control of Power Transmission and Conversion Shanghai Jiao Tong University Shanghai China Relay Protection Automation and Communication Technology Electric Power Research Institute State Grid Jiangsu Electric Power Co. Ltd. Nanjing China

ISBN: (纸本)9781665418195

The stability of Rudong offshore wind farm through a voltage-source converter (VSC) based DC transmission system was studied in the paper. Firstly, the electrical topology the wind farm with the DC transmission system was set up. Secondly, the control system of direct-drive wind turbines and the VSC of the DC transmission system was modeled, and then the dynamic mathematical model of the entire system was obtained. The oscillation modes of the system were analyzed by eigenvalues analysis. The state variables and influence parameters related to oscillations were obtained according to the participation factor analysis. The parameters of wind power systems integrated into the grid as well as the VSC control of were deeply studied, and the effect of parameter change on system constancy was analyzed. © 2022 IEEE.

关键词： Offshore wind farms

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A Simplified Matching Algorithm of the Carbon Neutrality Path for the Industry Zones

A Simplified Matching Algorithm of the Carbon Neutrality Pat...

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IEEE Innovative smart grid Technologies - Asia (ISGT Asia)

作者： Jingqi Jin Nan Li Yening Lai Jie Huang Xuetong Chen State Key Laboratory of Smart Grid Protection and Control NARI Technology Co. Ltd. Nanjing China State Grid Qinghai Electric Power Company Economic and Technological Research Institute Xining China

ISBN: (纸本)9798350399677

After the carbon peaking and carbon neutrality goals were determined, industrial zones with high energy consumption began investigating their own carbon emission paths and formulating carbon emission reduction strategies. According to the zone's carbon emission projections, a reasonable estimate of the long-term carbon neutrality curve can be made, which has significant research implications for describing the carbon emission path and formulating carbon emission reduction measures. This paper uses the modified Kaya identity to build a model of the zone's carbon emissions. It proposes an algorithm for the zone's carbon-neutrality path matching the carbon peak path and determines the carbon emission peak year and carbon budget of the zone for achieving carbon peaking and carbon neutrality goals.

关键词： Industries Energy consumption Asia Carbon neutral smart grids

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Leakage flux-based method to identify the inrush current in transformers 12

Leakage flux-based method to identify the inrush current in ...

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12th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2020

作者： Zheng, Yu-Ping Zhang, Zhen-Ya Wu, Chong-Hao Pan, Shu-Yan Li, Zhou NARI Technology Co. Ltd State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

ISBN: (纸本)9781728170817

Inrush current occurrence in the power transformers is an unavoidable event that can happen due to energizing no-load transformer. Although various protection methods based on the terminal current and/or voltage have been proposed for transformer protection, the protection malfunction caused by the inrush current still occurs occasionally. In this paper, By comparing different closing angles of transformers with normal condition and differences in leakage flux near the yoke, a simple and accurate method is presented to identify transformer inrush current conditions. The change of the flux density on the leakage flux sensor can effectively identify the transformer inrush current. This identification method has been initially verified in the simulation in Maxwell. © 2020 IEEE.

关键词： Power transformers

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