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检索条件"机构=State Key Laboratory Of Smart Grid Protection And Control"

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Calculation of the Maximum Hosting Capacity of Distributed Photovoltaics in Distribution Networks Considering Flexible Interconnections 8

Calculation of the Maximum Hosting Capacity of Distributed P...

引用

8th International Conference on Power and Renewable Energy, ICPRE 2023

作者： Sun, Tong Song, Yi Yuan, Kai Hou, Ruosong An, Jiakun Jin, Wenguang Zhang, Shenxi Cheng, Haozhong Shanghai Jiao Tong University College of Smart Energy Shanghai China State Grid Economic and Technological Research Institute Co. Ltd. Beijing China Economic and Technological Research Institute of State Grid Hebei Electric Power Co. Ltd Hebei China Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai China

ISBN: (纸本)9798350328813

Large-scale access to distributed photovoltaics leads to power imbalance and frequent voltage fluctuations in distribution station areas, increasing the difficulty of operation control of distribution networks. To solve these challenges while improving the utilization rate of distributed photovoltaics, this study proposes a method for calculating the maximum hosting capacity (HC) of distributed photovoltaics in distribution networks, considering the flexible interconnection of low-voltage distribution station areas. First, two types of networking modes of the flexible interconnection of distribution station areas are analyzed and mathematical models are developed for them. Then, an optimization model of the maximum HC of distributed photovoltaics in a distribution network that considers the flexible interconnection of distribution station areas is established, and the increasingly tight linear-cut algorithm is used to solve it, which aims to narrow the gap introduced by the convex relaxation to get the optimal solution. Finally, the accuracy of the model and algorithm is checked in the modified IEEE 33-node distribution network. © 2023 IEEE.

关键词： distributed photovoltaic distribution network flexible interconnected device increasingly tight linear-cut algorithm low-voltage distribution station area maximum hosting capacity

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Model Predictive control Based Active Frequency Support Strategy for Combined Wind/Photovoltaic/Storage Power Station

Model Predictive Control Based Active Frequency Support Stra...

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China International Electrical and Energy Conference (CIEEC)

作者： Manliang Wang Bingtuan Gao Yingwei Jiang Yunfeng Tian Wenqi Dong Xuewei Shi School of Electrical Engineering Southeast University Nanjing China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China State Grid Hebei Zhangjiakou Scenery Storage and Transmission New Energy Co. Ltd Zhangjiakou China

The high penetration of renewable energy sources connected to the grid has brought great challenges to the frequency stability of the power system. For the combined wind/pohotovoltaic/storage power station, it is of great significance for better frequency performance to realize the coordination control of active power. Therefore, this paper presents a frequency active support strategy for combined wind/pohotovoltaic/storage power station. By establishing the model of combined wind/pohotovoltaic/storage power station, this strategy applies model predictive control (MPC) to optimize the total active power reference value and the allocation of response power of the combined wind/pohotovoltaic/storage power station. For obtaining better frequency performance, this strategy aims at absorbing wind and solar energy resources and improving the economy of energy storage station. In order to verify the performance of the proposed strategy, it is compared with droop control using MATLAB/Simulink when the load increasing and decreasing respectively. The simulation results clearly show the effectiveness of the active frequency support strategy proposed in this paper.

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smart substation network quality monitoring and fault prediction

Smart substation network quality monitoring and fault predic...

引用

2021 International Conference on Power Electronics and Power Transmission, ICPEPT 2021

作者： Li, Chao Peng, Qi Wang, Dehui Luo, Linglu Zuo, Huanhuan NARI Group Corporation State Grid Electric Power Research Institute Nanjing211006 China NARI Technology Co. Ltd. Nanjing211006 China State Key Laboratory of Smart Grid Protection and Control Nanjing210061 China

The smart substation communication network is the basis for information sharing of various devices in the substation. Its operation status has an important impact on the safe operation of the substation and even the power grid. Therefore, real-time status monitoring of the smart substation communication network is becoming more and more important. Aiming at the problems of single dimension, insufficient real-time performance and manual fault analysis in existing substation communication network state monitoring technology, this paper proposes a method of smart substation communication network state monitoring and fault prediction based on network communication quality. This paper uses switch ACL technology and coloring technology to obtain communication quality indexes such as bandwidth utilization, delay, and packet loss rate in real time;based on a multi-dimensional evaluation algorithm, a comprehensive evaluation model of network communication quality is constructed;the model of the relationship between abnormal network communication quality and failures is established. Finally, real-time monitoring of network communication quality and fault prediction are realized. The application analysis in a typical 110 kV substation shows that this method can effectively evaluate the network communication quality and accurately predict failures, and can guide operationer and maintenaner to quickly restore the normal operation of the communication network. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Telecommunication networks

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A Generic grid-forming control Structure for Modular Multilevel Converters

A Generic Grid-forming Control Structure for Modular Multile...

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Power Electronics and Power System Conference (PEPSC)

作者： Renxin Yang Gang Shi Qi Liu Xu Cai State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China Key Laboratory of Control of Power Transmission and Conversion Shanghai Jiao Tong University Shanghai China

The grid-forming control is recognized as an effective method to cope with the power grid stability problems with high renewable power penetration. The application of grid-forming control in modular multilevel converter-based high-voltage direct-current (MMC-HVDC) transmission systems is a promising trend. However, the MMC usually needs to switch between different control modes, such as DC voltage control, active power control, AC voltage control, etc. Conventional grid-forming control structures are hard to meet the above requirements. To solve this problem, a generic grid-forming control structure is proposed in this paper. The stored energy in the submodule capacitors of the MMC is utilized to construct the grid-synchronization mechanism. On this basis, a multi-variable control structure is applied on the DC side, making it easy to switch between different operation modes. Finally, simulation results in PSCAD/EMTDC show the effectiveness of the proposed control structure.

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Research on Reliability Improvement Scheme of Network in smart Substation 1

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International Top-Level Forum on Engineering Science and Technology Development Strategy and 5th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2020

作者： Shen, Bing Lu, Zhihao Lv, Hang Yang, Gui Li, Li State Grid Shanghai Municipal Electric Power Company Shanghai200122 China State Key Laboratory of Smart Grid Protection and Control Nanjing Jiangsu211106 China NR Electric Co. Ltd. Nanjing Jiangsu211106 China

ISBN: (数字)9789811597466

ISBN: (纸本)9789811597459

The data sharing based on process level network is the development trend of the digitalization of the secondary circuit in smart substation. However, abnormal problems of data transmission such as network storms bring certain hidden dangers to the safe and stable operation of the secondary equipment. In this paper, the main problems affecting the reliability of data transmission are analyzed, and the message management technology based on data flow control is proposed, which can effectively improve the reliability of data transmission. Aiming at the problem of cross-network data exchange, a solution based on cross-network port flow control is also proposed. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Flow control

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Research on Static Voltage Stability Index of Regional Power Network with New Energy Stations Based on Voltage Stability Criterion

Research on Static Voltage Stability Index of Regional Power...

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

作者： Qifei He Feng Qi Shen Wang Yuan Zeng Hao Sheng Junlong Ma National Electric Power Dispatching and Control Center State Grid Corporation of China Beijing China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China

With the increasing penetration of new energy, the problem of static voltage stability of power grid has become increasingly prominent, and there is an urgent need for a static voltage stability analysis method to simultaneously evaluate the new energy stations and load buses in a region. To solve this problem, this paper proposes a static voltage stability index based on the voltage stability criterion, which is used to judge the voltage stability of new energy station buses and load buses in the regional network. Firstly, based on the Thevenin equivalence method, the power network with a high proportion of new energy is equivalent to a single machine single load system; Secondly, the analytical static voltage stability index is derived based on the voltage stability criterion; Then the mechanism of this index is compared with L index from the analytical formula, and the reasons for the error of L index in the case of heavy load and large new energy generation are described; Finally, the validity and accuracy of the proposed index in judging the static voltage stability of new energy stations and load buses are verified based on the modified IEEE 3-unit 9-bus example with new energy stations.

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Research on Man-Machine Service Reliability of New Generation Power System 3

Research on Man-Machine Service Reliability of New Generatio...

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2021 3rd International Conference on Electronic Engineering and Informatics, EEI 2021

作者： Yin, Xia Li, Lulu Lv, Zhimeng Yan, Zhen Xu, Hua Zhao, Kun Huang, Kun Nari Group Corporation State Grid Electric Power Research Institute Nanjing211106 China Nari Technology Co. Ltd. Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

With the rapid growth of smart grid dispatching business scale, the traditional fat client mode power system has a large degree of business coupling, which limits the power grid dispatching business. But the lightweight man-machine cloud terminal and man-machine service framework have greatly reduced the coupling degree of the grid dispatching system business. The appearance of man-machine service reduces the development cost of client, and makes the unified browsing of multi system and multi terminal equipment easier. However, how to ensure the reliability and stability of man-machine interaction service is a question worthy of discussion. How to adapt to the interaction of a lot of clients and to adapt to the requests of different clients put forward higher requirements for man-machine service. This article describes the man-machine service architecture and key technologies to ensure reliability, introduces technologies such as load balancing and thread pools that adapt to the characteristics of power grid human-computer interaction, introduces in detail the distributed job scheduling management mechanism within the man-machine service, and describes the standardized request and return result of man-machine service. Finally, through sample testing and on-site operation, demonstrate the reliability of the man-machine service. © Published under licence by IOP Publishing Ltd.

关键词： Reliability

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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...

引用

2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

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

ISBN: (纸本)9781665414395

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. © 2021 IEEE.

关键词： Embedded systems

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Low-Frequency Offshore Wind Power Transmission System with Dual-End grid-Forming control

Low-Frequency Offshore Wind Power Transmission System with D...

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International Conference on Renewable Energy and Power Engineering (REPE)

作者： Nan Fu Bao Liu Yunfei Xu Sitong Zhu Kui Wang Yongdong Li State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd. Shenyang China

ISBN: (数字)9798350375558

ISBN: (纸本)9798350375565

The offshore wind power has been gaining increasing attention in recent years. Low-frequency alternating current (LFAC) transmission is emerging as a promising technology with specific advantages for offshore wind power transmission. This paper discusses the structure and control of the offshore wind power transmission system based on LFAC. In order to enhance the support for the power system, grid-forming control can be implemented on both sides of the modular multilevel matrix converter (M3C) used in LFAC. Additionally, the capacitor voltage control of M3C is briefly introduced. Furthermore, power reserve control is utilized to enable wind turbines to participate in primary frequency regulation. Finally, the effectiveness of the designed control system is verified through simulation using PSCAD/EMTDC, further demonstrating the efficacy of the strategy.

关键词： Current control Capacitors Wind power generation Wind farms control systems Wind turbines Voltage control Matrix converters Frequency control grid forming

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Frequency Regulation Potential Evaluation of Temperature-controlled Load Aggregators Considering Demand Response Willingness

Frequency Regulation Potential Evaluation of Temperature-Con...

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

作者： Jie Yu Jiaqi Yang Qia Ding Mengfu Tu Weixi Ji Electrical Engineering Southeast University Nanjing China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing China

The frequency regulation potential of temperature-controlled load aggregators means that, the total load reduction that all the aggregated temperature-controlled load users can participate in the frequency regulation. User demand response willingness refers to the willingness of users to adjust electricity consumption according to the price of electricity sales to provide demand response based on their own demand response elasticity. This paper establishes a user demand response willingness model including two parts of electricity cost change and temperature change, which is used to characterize the relationship between user frequency regulation potential and electricity price; then proposes a time series chained two-dimensional cloud generator algorithm for the willingness model to predict the temperature-controlled load operating state in the temperature-controlled load, and finally establish a two-layer model to optimize the frequency regulation potential of the temperature-controlled load aggregator, with the frequency regulation potential as the solution variable. The effectiveness of the algorithm and the model are verified through calculation examples, and sensitivity analysis is carried out.

关键词： Electric potential Cloud computing Time series analysis System integration Predictive models Prediction algorithms Demand response

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