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Status evaluation of smart substation measurement and control device

Status evaluation of smart substation measurement and contro...

引用

第二届先进电子材料、计算机与材料工程国际学术会议（AEMCME 2019）

作者： Zhang Min Shen Jian Chen Li Zhou Bin Zhou Shao Liang Hou Zhe NARI Group Corporation (State Grid Electric Power Research Institute) State Key Laboratory of Smart Grid Protection and Control NARI Technology Corporation Co. Ltd

In power system, measurement and control device plays an important role in maintaining an ideal level of reliability. Therefore, the reliability of the measurement and control device should be evaluated to fully understand the cause of its failure. A new evaluation model is proposed, which relates the fault of measurement and control system with the four main reasons of device hardware fault, software fault, auxiliary equipment fault and human fault. In addition, the model can also comprehensively consider other aspects of the measurement and control system, such as human error in testing and software upgrade, effectiveness of daily operation monitoring, degree of dependence on self-inspection, local backup and misoperation. These studies have a lot of significance to the reliability of the control system, and also can effectively improve the stability of the system.

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Energy Storage Planning and Economic Dispatch of Microgrid Considering Power to Gas

Energy Storage Planning and Economic Dispatch of Microgrid C...

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IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

作者： Jiaqi Gu Fei Mei Jixiang Lu Jinjun Lu Bo Yang College of Energy and Electrical Enginering Hohai University Nanjing China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China China Electric Power Research Institute Nanjing China

ISBN: (数字)9781728157481

ISBN: (纸本)9781728157498

New energy has been vigorously promoted for its advantages such as cleanliness, large reserves and renewability. Recently, power-to-gas (P2G) technology has provided a new idea for energy conversion, which helps to improve energy efficiency. In view of the current high penetration rate of photovoltaics, the impact of three measures with regard to energy conversion, energy storage configuration and demandside response on the economics of the microgrid and the optimal scheduling of the microgrid are explored. Firstly, a microgrid scheduling model with P2G device is built; Secondly, a bi-level planning model for the economic cost of the microgrid scheduling is presented. The upper layer will be based on absolutely accommodation of photovoltaics as the prerequisite to conFigure the optimal energy storage capacity; Then lower layer performs optimized scheduling under the upper model to ensure the economy of the microgrid. Finally, a comparison example is used to analyze the optimal energy storage capacity in different scenarios and an optimized scheduling scheme is given.

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A Security Evaluation of Distribution Networks CPS Considering Information- Physical Combinations Anticipated Failure Screening

A Security Evaluation of Distribution Networks CPS Consideri...

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IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Ming Ni Manli Li Xia Zhou Zhou Yang NARI Group Corporation (State Grid Electric Power Research Institute) NARI Technology Co. Ltd. State Key Laboratory of Smart Grid Protection and Control Nanjing China Institute of Advanced Technology Nanjing University of Posts and Telecommunication Nanjing China

ISBN: (数字)9781728167824

ISBN: (纸本)9781728167831

With the rapid development of ICT technology and automation control technology, the distribution network has gradually transformed into a distribution network information physical system (distribution network CPS) with highly coupled information systems and physical systems. The information system supports the stable operation of the physical system, and it also brings certain security risks to the distribution network CPS. Therefore, information impact should be considered in the original single physical anticipated fault assessment. This paper proposes a security analysis and evaluation method for distribution network CPS considering information-physical combination anticipated fault screening. Firstly, based on the CPS structure of the distribution network, a CPS correlation matrix model of the distribution network that can reflect the power-information coupling characteristics is established. Then analyze the correlation between information failure and physical failure, and construct an initial information-physical combination anticipated fault set according to topology correlation and service correlation. Then, based on the fault recovery rate ordering, the key information- physical combination anticipated fault is selected. Finally, for the selected combination of anticipated failures, the security assessment of the distribution network CPS security assessment indicators is carried out, and verified in the example.

关键词： distribution network CPS association matrix anticipated failure information-physical combination Power grids Computer based information systems physical fault set faults stability operations

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Study on Robust Estimation of Combined Heat and Power Networks based on Huber Estimation

Study on Robust Estimation of Combined Heat and Power Networ...

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Sustainable Power and Energy Conference (iSPEC)

作者： Yunlong Hu Qi Wang Ming Ni Yi Yang Yongkang Zhu Xiecheng Yao College of Electrical and Automation Engineering Nanjing Normal University Nanjing China State Key Lab of Smart Grid Protection and Control NARI Group Corporation Nanjing China State Grid Jiangsu Electric Power Research Institute Nanjing China

ISBN: (纸本)9781665414401

Combined heat and power state estimation is the basis for safety assessment, optimal dispatching and other functions in multi-flow energy management centers, and has important theoretical value and practical significance. The measurement system inevitably has gross errors or bad data. The traditional weighted least squares method can’t restrain its influence, so the robust estimation method of combined heat and power network based on Huber estimation is proposed. The results of calculation examples show that the proposed method has good robustness and can restrain the influence of gross errors on the estimation accuracy.

关键词： Couplings Cogeneration Measurement uncertainty Robustness Safety Power systems state estimation

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Risk Analysis of Electric Vehicles Connected to the Cyber-physical Power System

Risk Analysis of Electric Vehicles Connected to the Cyber-ph...

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Sustainable Power and Energy Conference (iSPEC)

作者： Manli Li Ming Ni Heqin Tong Yingtao Ru Jinjiang Xu Yingjun Wu 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 College of Energy and Electrical Engineering Hohai University Nanjing China

ISBN: (纸本)9781665414401

The promotion and application of electric vehicles can effectively alleviate environmental pollution and fuel shortages. However, when a large-scale electric vehicle is connected to the power system, it brings the risk of cyber-attacks during the massive data communication process. If the cyber-attack in the data transmission process cannot be effectively detected for safety, the charging behavior will not be controlled correctly and effectively. The safe operation of cyber-physical power systems will take great risks. Therefore, the cybersecurity risks that may exist when electric vehicles are connected to the cyber-physical power system are analyzed in this article. Firstly, based on the communication structure of large-scale electric vehicles connected to the cyber-physical power system, the potential safety hazards in the information communication network of electric vehicles are analyzed. Exploring the possible cyber-attacks during the information interaction to discover the risks to the power grid caused by malicious cyber-attacks of electric vehicles. Thus, it provides the foundation for the study of power grid stability control methods and escorts the further development of the smart grid.

关键词： Power measurement Pollution Process control Power system stability Electric vehicles Stability analysis smart grids

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Research on Coordinated control of Photovoltaic System Based on VSC-HVDC

Research on Coordinated Control of Photovoltaic System Based...

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Power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Di Wu Tonghua Wu Xindong Li Hongbin Wu Anhui Provincial Laboratory of Renewable Energy Utilization and Energy Saving Hefei University of Technology Hefei China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China

ISBN: (数字)9781728152813

ISBN: (纸本)9781728152820

The combination of photovoltaic (PV) power generation and voltage source converter-based high voltage direct current (VSC-HVDC) system is one of the development directions of new energy power generation and its power transmission in the future. Power grid failure or maintenance will lead to power outage. In order to reduce the economic loss caused by this, the PV-VSC-HVDC coordinated control system is used to continuously supply power to loads in island state to maintain its normal operation. By analyzing the mechanism and cause of the islanding effect, a coordinated control strategy suitable to PV-VSC-HVDC system is proposed. Finally, a PV-VSC-HVDC grid-connected system was built based on Matlab/Simulink, and a detailed simulation analysis of the operating characteristics of the system is made. The simulation results show that this control strategy can realize the smooth switch from grid-connected state to island state, ensuring the stable operation of the loads and reducing the economic loss caused by power failure.

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Fundamental Characteristics and Four-tier Residential Customer Energy Consumption Behavior Model

Fundamental Characteristics and Four-tier Residential Custom...

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smart grids and Energy Systems (SGES), International Conference on

作者： Jianmin Zhang Yusheng Xue Fushuan Wen Ping Luo Junteng Luo Yukuan Wang School of Automation Hangzhou Dianzi University Hangzhou China State Key Laboratory on Smart Grid Protection and Control Nanjing China College of Electrical Engineering Zhejiang University Hangzhou China

ISBN: (数字)9781728185507

The big obstacle for residential energy transition is the lack of a consumption behavior model. At first, special characteristics of residential customer are discussed, including their fundamental purpose of energy use and attitudes against constraints and energy prices, as well as derived demand characteristics on appliance in energy consumption, etc. Then, a four-tier energy consumption behavior model of residential customers is developed with “virtual appliance” being generalized into three time scales as current, near future, future, and the behavior evolution process is sectionalized into cognition, consciousness, demand and behavior. The methodology and technology to implement the four-tier model in real applications will be dominated by the emerging cyber physical social system in energy, and a customized questionnaire survey system is demanded to investigate the consumption behaviors of residential customers.

关键词： Economics Energy consumption Home appliances Production Cognition smart grids Object recognition

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Extended Engel-Kollat-Blackwell Consumption Behavior Model for Residential Customers

Extended Engel-Kollat-Blackwell Consumption Behavior Model f...

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smart grids and Energy Systems (SGES), International Conference on

作者： Jianmin Zhang Yusheng Xue Fushuan Wen Dongming Liu Ping Luo Yang Li School of Automation Hangzhou Dianzi University Hangzhou China State Key Laboratory on Smart Grid Protection and Control Nanjing China College of Electrical Engineering Zhejiang University Hangzhou China

ISBN: (数字)9781728185507

ISBN: (纸本)9781665448505

Modeling the consumption behavior of residential customers is very important for investigating their potentials to participate in demand side management and retail market competition. The Engel-Kollat-Blackwell (EKB) model is well-known in consumption behavior modeling, however it is not directly applicable for modeling residential energy consumption, as explored in this paper. An extension of the EKB model is next developed to explain the behaviors of residential energy consumption, including derived demand characteristics, habit change process, behavior change process, internal feedback, external stimulus factors, and environment factors, and employed to implement a green information system so as to guide the residents in energy transition. A questionnaire survey information APP system on WeChat is implemented and the survey results briefly analyzed.

关键词： Energy consumption Social networking (online) Green buildings Message service Data models smart grids Information systems

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Research on Low Order Harmonic Suppression of Motor Drive System under Two-Phase Rotating Coordinate Frame 17th

Research on Low Order Harmonic Suppression of Motor Drive Sy...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Yong, Tao Liu, Jing Li, Wenxiao Yang, Guanjian Tang, Mengyang 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 State Grid Sichuan Electric Power Company Chengdu610041 China

ISBN: (纸本)9789819904075

Due to nonlinear factors such as dead-time and tube voltage drop, low-order harmonics will be injected into the output voltage of the inverter, resulting in fifth and seventh harmonic distortion of stator current and increasing torque ripple. At the same time, the natural frequency of inductor motor used in electrical vehicle is low, when the motor runs at medium and high speed, the low harmonic frequency of the current coincides with the natural frequency of the motor, resulting in resonance. To solve the above problems, firstly, the simulation and test method of the natural frequency of the IM is studied, and the natural frequency range of the IM is determined. Then, based on the analysis of the harmonic distortion characteristics caused by dead-time and tube voltage drop, a sixth harmonic controller is added to the current inner loop of the vector control system after rotor flux orientation (d-q coordinate), and the design method of the controller parameters is studied. Finally, the simulation model is established, which shows that the theoretical analysis and the proposed harmonic control method are correct and feasible. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Harmonic distortion

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Distribution network protection method based on Hankel singular value decomposition and transient energy

Distribution network protection method based on Hankel singu...

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Intelligent Design (ICID), International Conference on

作者： Wei Long Shuyan Pan Tonghua Wu Wei Dai Dan Wu Kuncheng Zheng School of Electrical and Automation Engineering Nanjing Normal University Nanjing Jiangsu China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing Jiangsu China Nari Group Corporation Nanjing Jiangsu China

As a new technology, 5G technology has a lower cost than optical fiber and a transmission speed and carrying capacity comparable to optical fiber. It can improve the performance of the distribution network communication system, and it also enables differential protection based on double-ended data coordination. The protection has a new life. The factors affecting the reliability of differential protection are mainly divided into the accuracy of the synchronization algorithm and the reliability of the protection algorithm. Starting from these two aspects, this paper uses the Hankel matrix singular value decomposition to achieve the synchronization of the double-ended fault time; and designs a method based on transient differential energy, which is consistent with the judgment by judging the continuous sampling points in the sliding time window. The number of data sampling points constitutes the condition of protection action. The proposed method can reliably act on short-circuit faults, ground faults and high-resistance faults that occur in the area, and will not malfunction for out-of-area faults, regardless of the type of fault, transition resistance and other factors. Finally, PSCAD/MATLAB is used to verify the feasibility of the proposed method.

关键词： Resistance Grounding 5G mobile communication Design methodology Distribution networks Synchronization Reliability

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