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10th International Conference on Power and Energy Systems Engineering, CPESE 2023

作者： Wang, Wei Xu, Chenjin Wang, He Su, Wenbo Ji, Zhenya Hu, Minqiang Nanjing Normal University State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nari School of Electrical and Automation Engineering Nanjing China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China Nanjing Normal University Nari School of Electrical and Automation Engineering Nanjing China

ISBN: (纸本)9798350327625

The magnetic field energy harvesting has become a more suitable method for powering the monitoring sensors due to its simple energy harvesting structure, high power density, and stable energy source. However, existing magnetic field energy harvester have limitations such as restricted installation size, single application scenario, and difficulty in installation or disassembly. Motivated by the above problems, this paper proposes a flexible spiral magnetic field energy harvesting (SMFH) method, which is verified by the establishment of energy harvesting models, theoretical derivation, and simulation analysis. On this basis, a comprehensive performance analysis is performed on the number of windings, load characteristics, flexibility, weight, and non-ideal resonant state. Also, the sensitivity of the flexible SMFEH to various parameter changes is deeply analyzed. Finally, the experiments have verified the feasibility of the flexible SMFEH. © 2023 IEEE.

关键词： Energy harvesting

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Research on External Characteristics for PMSG Wind Turbine Systems under Symmetrical Fault

Research on External Characteristics for PMSG Wind Turbine S...

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2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Xie, Hua Zhao, Qingchun Liu, Peilin Gao, Xuesong NARI Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China School of Electrical Engineering Shandong University Jinan China

ISBN: (纸本)9781728191645

Wind turbines (WTs) are based on power electronic converters. Due to different control schemes of converters, WTs exhibit diverse external characteristics when grid symmetrical fault occurs. Thus, the output current and output power of WTs cannot be forecasted, which is a challenge for the power system stability. In this regard, this paper proposes a novel strategy for Permanent Magnetic Synchronous Generator (PMSG) wind turbine systems. The strategy aims to force the PMSG exhibit a stable EFC during grid fault and provide an output current reference to the power system. Besides, the proposed strategy aims at enhancing the low-voltage ride-through capability of the PMSG. The effectiveness and robustness of the proposed strategy is verified in DIgSILENT PowerFactory. © 2020 IEEE.

关键词： Synchronous generators

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Maximum Capacity Assessment for Multi-paralleled grid-connected Inverters using Global-Admittance based Harmonic Stability Analysis

Maximum Capacity Assessment for Multi-paralleled Grid-connec...

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2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Yang, Ming Liu, Fusuo Wang, Yu Cao, Wu Southeast University School of Electrical Engineering Nanjing China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China

ISBN: (纸本)9781665414395

With the increasing demand for the renewable energy, the stability of the multi-paralleled grid-connected inverters is the important factor for evaluation the capacity of the inverters connected to power grid. In this paper the maximum capacity assessment for multi-paralleled grid-connected inverters using global-admittance based harmonic stability analysis is proposed. The stability analysis method with global admittance has clear physical concept and is convenient for real-time analysis and calculation. The global admittance method is illustrated first. The inverters are sorted by the capacity. The inverters sequence can be divided into two groups based on the stable critical point obtained by the global admittance method. The group with large capacity is taken as a unit. The stability of the combinations formed by this unit and other inverters in the other group is analyzed further. So the maximum capacity of the grid-connected inverters can be assessed. The application example is used to illustrate and verify the proposed method in this paper. © 2021 IEEE.

关键词： Stability

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Inertial Response of Doubly-fed Induction Generator with the Phase-locked Loop

Inertial Response of Doubly-fed Induction Generator with the...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Mengqi, Qing Fei, Tang Dichen, Liu Mengjiao, Qing Weiqiang, Liang Wen, Jian Chufei, Xiao Fusuo, Liu School of Electrical Engineering Wuhan University Wuhan China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China

ISBN: (纸本)9781728135205

With the development of wind power, the problem of system inertia and frequency dynamic deterioration caused by large-scale wind power integration is becoming more serious. The inertial response of wind turbines is worthy of attention and research. In this paper, the quantitative calculation method of the equivalent virtual inertia time constant HeqDFIG of the doubly-fed induction generator (DFIG) with the phase-locked loop (PLL) is studied, and the influence of the PLL on the inertial response of DFIG is analyzed. Firstly, a simplified model of DFIG with the PLL is established. By calculating the electromagnetic torque increment, the equivalent virtual inertia time constant HeqDFIG of the DFIG considering the dynamic characteristics of the PLL is obtained. And the influence of the PLL parameter variation on the virtual inertial response of the system is analyzed. Simulation verification proves the correctness of the conclusion. © 2019 IEEE.

关键词： Phase locked loops

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REVIEW ON REACTIVE POWER OPTIMIZATION OF HIGH PROPORTION RENEWABLE ENERGY POWER SYSTEM 9

REVIEW ON REACTIVE POWER OPTIMIZATION OF HIGH PROPORTION REN...

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9th International Conference on New Energy and Future Energy Systems, NEFES 2024

作者： Yang, Xinyi Shan, Xin Chen, Tianhua Zhao, Jinquan School of Electrical and Power Engineering Hohai University Nanjing China Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9781837241880

High penetration renewable energy connected to power grid intensifies the voltage fluctuation of grid nodes and brings great challenges to reactive power control of power system, while the integration of a mass of power electronics into the system significantly enriches the means of voltage regulation. In this paper, review and outlook on the reactive power optimization of high proportion renewable energy power system are presented. Firstly, the novel characteristics of reactive power control of the system are analysed from six aspects: source-load uncertainty, voltage stability, high penetration power electronics, demand-side flexibility, power market environment, and transmission and distribution integration. Secondly, the existing researches are introduced corresponding to these characteristics. Finally, the outlook of an overall research framework of the reactive power optimization covering time, space and target scales is proposed for the stable operation of the high proportion renewable energy power system. © The Institution of Engineering & Technology 2024.

关键词： FLEXIBLE LOAD HIGH PROPORTION RENEWABLE ENERGY POWER SYSTEM POWER ELECTRONICS REACTIVE POWER OPTIMIZATION VOLTAGE STABILITY

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Future grid Configuration of AC/DC Distribution Network Considering the Influence of Photovoltaic Permeability

Future Grid Configuration of AC/DC Distribution Network Cons...

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2022 International Conference on smart Energy and Electrical Engineering, SEEE 2022

作者： Ni, Jianfu Liang, Feng Zhang, Kun Yu, Zhuofei R&D Department in NARI Technology NARI Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China R&D Department in NARI Technology NARI Group Corporation State Key Laboratory of Smart Grid Protection and Controlline Nanjing China Tianjin China

With the implementation of China's "carbon neutral, carbon peak"dual carbon target action plan and the construction of a new power system, access to a high proportion of new energy and microgrid has changed the function and form of the distribution network. The current capacity of the distribution network to absorb a high proportion of new energy cannot fully meet the needs of future development. Through rational planning, the carrying capacity of a distribution network for new energy can be improved, operation efficiency can be improved, and expansion investment can be delayed. Therefore, based on the analysis of the current typical network architecture of the distribution network, combined with the development trend of the AC/DC distribution network and the development trend of a high proportion of new energy penetration, this paper puts forward the future architecture and network shape of the AC/DC distribution network, focusing on the short-term, long-term and cellular AC/DC distribution network shape characteristics. It also discusses the influence of Photovoltaic (PV) permeability level on the grid configuration selection of AC/DC distribution network. Finally, it discusses the problems worthy of attention in the future planning of AC/DC distribution networks. © Published under licence by IOP Publishing Ltd.

关键词： Electric power distribution

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Prediction of Day-Ahead Electricity Price Based on N-BEATSx Model Optimized by SSA Considering Coupling Between Features 1

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7th Purple Mountain Forum on smart grid protection and control, PMF2022

作者： Xu, Feihong Teng, Xianliang Lu, Jixiang Zheng, Tao Jin, Yulong Nanjing211106 China NARI-TECH Nanjing Control System Ltd Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

ISBN: (数字)9789819900633

ISBN: (纸本)9789819900626

With the continuous advancement of Chinese electricity market reform, the continuous improvement of the market mechanism and the integration of a large number of new energy sources have brought great challenges to the market’s clear electricity price forecast. The new energy output, load data, and tie-line power schedule are fused to obtain an improved input feature variable, which can better reflect the electricity price trend. Then, the maximum information coefficient method (MIC) was used to analyze the correlation between each characteristic variable and electricity price, and an interpretable time series prediction model (N-BEATSx) based on neural network base expansion analysis of fusion characteristic variables was adopted. It is interpretable and can solve nonlinear forecasting problems of time series with the trend, seasonality, and significant random fluctuations. For the selection of hyperparameters in the N-BEATSx prediction model, the sparrow search algorithm (SSA) is used for optimization, the optimal grid structure hyperparameters are obtained with the minimum loss function of the validation set as the objective function. To verify the validity of the proposed model, the Shanxi Province market electricity price data is taken as an example to analyze and compare with other forecasting models, the results show that the proposed model can predict the electricity price of the day before clearing well. © State grid Electric Power Research Institute 2023.

关键词： Power markets

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Risk Assessment of Cyber Physical Power System considering Attack Model 5

Risk Assessment of Cyber Physical Power System considering A...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Li, Manli Xu, Haibo Xu, Jianbing Ding, Zhao Liu, Qitao Yin, Zhaoyang Nari Group Corporation State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and Control School of Electrical of Engineering Southeast University Nanjing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

The close coupling between cyber and physics makes malicious attacks seriously affect the security of power system. Firstly, this paper analyzes the possible attack scenarios, establishes the attack graph model, and proposes the calculation method of the attack probability. On this basis, combined with the security and stability control business, the impact on the power primary system is analyzed, and the risk assessment method of malicious attack is proposed. Finally, an example illustrates the improvement of cyber - physical analysis, and proves that cyber - physical analysis technology has a good application prospect. © 2022 IEEE.

关键词： Risk assessment

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Overview of DC transmission line fault analytical methods and single-ended protection 4

Overview of DC transmission line fault analytical methods an...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Pu, Hongfei Li, Xindong Wu, Tonghua Yao, Gang Nari Group Corporation State Grid Electric Power Research Institute Nanjing China Nari Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9781728171494

DC transmission technology, which plays an important role in connecting AC grids, can transmit power asynchronously under long-distance and large-capacity conditions. protection devices and control system of the DC transmission system are quickly put into use after the information of the first traveling wave caused by faults of DC lines having been detected. Therefore, the current HVDC transmission line mainly adopts single-ended protection based on first traveling wave information as main protection for DC lines and such protection is not affected by the control strategy. But in the fault transient stage, changes of electrical quantities of DC transmission lines will show nonlinear characteristics because of the control strategy. At present, the analytical method of fault characteristics in the transient stage is not perfect and the rapid coordination of control and protection has not been realized. This paper presents an overall introduction to the research statuses of fault analytical methods and single-ended protection principles of DC transmission lines. First, the fault characteristics of LCC- based DC transmission lines and VSC-based DC transmission lines are compared. Second, the current research statuses of HVDC transmission line analytical models and fault transient analytical methods are analyzed and the shortcomings of current analytical methods are listed. Third, the current single-ended protection principles of DC transmission lines are classified, and then the problems and valuable research directions in the process of studying single-ended protection principles based on the coordination of control and protection are listed. Finally, the outlook for the rapid coordination of control and protection of DC transmission lines is determined. © 2021 IEEE.

关键词： HVDC power transmission

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A security scheme for intelligent substation communications considering real-time performance

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Journal of Modern Power Systems and Clean Energy 2019年第4期7卷 948-961页

作者： Jie ZHANG Jun’e LI Xiong CHEN Ming NI Ting WANG Jianbo LUO Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of EducationSchool of Cyber Science and EngineeringWuhan UniversityWuhan 430072China 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

Tampering,forgery and theft of the measurement and control messages in a smart grid could cause one breakdown in the power ***,no security measures are employed for communications in intelligent *** services in an intelligent substation have high demands for real-time performance,which must be considered when deploying security *** paper studies the security requirements of communication services in intelligent substations,analyzes the security capabilities and shortages of IEC 62351,and proposes a novel security scheme for intelligent substation *** security scheme covers internal and telecontrol communications,in which the real-time performance of each security measure is *** this scheme,certificateless public key cryptography(CLPKC)is used to avoid the latency of certificate exchange in certificate-based cryptosystem and the problem of key escrow in identity-based cryptosystem;the security measures of generic object-oriented substation event,sampled measure value and manufacturing message specification in IEC 62351 are improved to meet the real-time requirements of the messages as well as to provide new security features to resist repudiation and replay attacks;and the security at transport layer is modified to fit CLPKC,which implements mutual authentication by exchanging ***,a deployment of CLPKC in an intelligent substation is *** also evaluate the security properties of the scheme and analyze the end-to-end delays of secured services by combining theoretical calculation and simulation in this *** results indicate that the proposed scheme meets the requirements of security and real-time performance of communications in intelligent substations.

关键词： Intelligent substation Security measures Certificateless public key cryptography(CLPKC) Real-time communication IEC 62351

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