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检索条件"机构=State Key Laboratory of Smart Power Grid Protection and Control"

共 534 条记录，以下是251-260 订阅

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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...

引用

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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Transient Stability Enhancement of grid-Forming Converter in an Islanded AC Microgrid

Transient Stability Enhancement of Grid-Forming Converter in...

引用

International Conference on power Electronics and Motion control (IPEMC)

作者： Yawen Ding Fei Gao Kai Hou Yingwei Jiang Qiang Gao Key Laboratory of Control of Power Transmission and Conversion Ministry of Education China College of Smart Energy Shanghai Jiao Tong University China NARI Group Corporation State Grid Electric Power Research Institute China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

With a growing share of renewable energy being incorporated into microgrids through power electronic converters, isolated microgrids are at higher risk of losing transient stability when exposed to significant disturbances, primarily due to the reduced inertia and increased nonlinearity inherent in power converters. This paper introduces a novel control strategy aimed at enhancing transient stability for the grid-forming converter within the islanded AC microgrid, utilizing model prediction techniques. By adjusting the output voltage of the grid-forming converter with the additional term produced by model prediction, the balance between the system’s equivalent input and output torques can be accelerated. The proposed strategy’s effectiveness and superiority are validated through simulation using MATLAB/Simulink.

关键词： Renewable energy sources Microgrids power system stability Predictive models Stability analysis power electronics Mathematical models

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

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

引用

2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Liu, Qitao Hou, Yuqiang Xu, Jianbing Liu, Yongkang Nari Technology Co. Ltd Nanjing211106 China Nari Group Corporation State Grid Electric Power Research Institute Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

ISBN: (纸本)9781665414395

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. © 2021 IEEE.

关键词： Hardware-in-the-loop simulation

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The Commonality of Economic Dispatch Models Based on Scenario/Interval

The Commonality of Economic Dispatch Models Based on Scenari...

引用

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

作者： Yishen Wang Renjie Wei Fengbin Sun Ruihan Zhang Tiechui Yao Lan Ren Future Science Park State Grid Smart Grid Research Institute Co Ltd Beijing China Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education State Grid Smart Grid Research Institute Co Ltd Shandong University Jinan China

With the increasing penetration of renewable energy, how to maximize the acceptance of renewable energy on the basis of satisfying the economy security and reliability of the power system is an urgent problem to be solved. In this area, mathematical optimization methods such as robust optimization and stochastic optimization are generally used to construct models based on different uncertainty descriptions. Previous studies have shown that robust optimization has high computational efficiency but conservative results, while stochastic optimization has low computational efficiency but accurate results. Therefore, different studies will choose suitable methods based on the characteristics of the models to be constructed. However, existing studies have not thoroughly discussed whether there is a connection between the two methods. This paper first proposes an economic dispatch model based on scenario considering the admissible region of net load, and introduces a new affine strategy to transform this model into a deterministic form. Secondly, based on further exploration of the characteristics of economic dispatch models based on scenario/interval, the paper concludes that the two models are common when they are sufficiently precise. Finally, the correctness of the conclusion is verified on the IEEE-RTS system.

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A Novel Pre-synchronization control Strategy for Virtual Synchronous Generator Based on NLADRC-PLL 4

A Novel Pre-synchronization Control Strategy for Virtual Syn...

引用

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

作者： Geng, Shaobo Wang, Qiang Ren, Jiangbo Li, Yongli Chen, Xiaolong Li, Song State Grid Hebei Electric Power Corporation Dispatching and Control Center Hebei China Tianjin University Key Laboratory of Smart Grid of the Ministry of Education Tianjin China

ISBN: (纸本)9781728171494

Due to the mismatched voltage amplitude, phase and frequency between virtual synchronous generator (VSG) and utility grid, there may exist significant impulse current when VSG connects to the gird through the point of common coupling (PCC). This paper designs a NLADRC-PLL and proposes a novel pre-synchronization control strategy to decrease the impulse current. Firstly, a phase lock loop based on nonlinear active disturbance reject control (NLADRC-PLL) is designed to obtain the voltage information of the PCC quickly and flexibly. Then, PCC voltage information obtained by NLADRC-PLL is embedded into both active and reactive control loops of VSG through certain logic control. Finally, the impulse current caused by the VSG-grid connection in the presence of PCC voltage magnitude, frequency and phase suddenly changing is effectively suppressed. Simulation results of 5 cases are given to demonstrate the effectiveness and feasibility of the proposed presynchronization control strategy. © 2021 IEEE.

关键词： Synchronization

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Applicability Analysis of Distance protection for the Line Integrated with High Proportional Wind Farm

Applicability Analysis of Distance Protection for the Line I...

引用

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

作者： Yongwu Zhang Cheng Yao Dayong Li Xiaoxiao Huang Zhongrun Xie Jiawei He Bin Li Electric Power Dispatching and Control Center State Grid Tianjin Electric Power Company Tianjin China Electric Power Research Institute State Grid Tianjin Electric Power Company Tianjin China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China

The performance of conventional protections is serious challenged by different fault characteristics of wind turbine, compared to the synchronous generators. The existing studies can only illustrate the applicability of protections to the renewable energy transmission system through qualitative analysis or extensive simulations. This paper proposes a quantitative evaluation method for distance protection applicability in wind power transmission system. Firstly, by deriving the fault current of doubly-fed induction generators, the Fourier algorithm error of the fundamental frequency current under the influence of frequency deviation phenomenon is calculated. Secondly, based on the analysis of the measured impedance error caused by the Fourier algorithm error, the action accuracy of the distance protection under different operation states and fault conditions are obtained. In particular, the protection applicability under different wind power ratios is evaluated for the wind power transmission system bundled with synchronous generators. Finally, a real time simulation model of wind power transmission system is built based on RTDS platform, and extensive simulation cases are carried out to verify the validity of the proposed method.

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Failure Mode Risk Analysis of DC Charger Based on Cloud Model and TOPSIS

Failure Mode Risk Analysis of DC Charger Based on Cloud Mode...

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Prognostics and System Health Management Conference (PHM-Qingdao)

作者： Li Yuan Tan Wen Yan Su Zichao Yi Yu Wang State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China Nanjing University of Aeronautics and Astronautics College of Civil Aviation Nanjing China

This paper overcomes the shortcomings of the traditional Risk assessment method of Risk Priority Number (RPN). The evaluation process is established by combining the Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) with the cloud model theory. And applied to solve the DC charger failure mode risk assessment, analysis and determination of DC charger key failure mode and failure mechanism. Firstly, the expert assessment information of DC charger fault mode was converted into a cloud model, and then the risk assessment index and expert weight of risk assessment were calculated. Finally, the TOPSIS method was used to determine the risk priority of the fault mode, and the failure mechanism of the high-priority fault mode was analyzed to determine the failure physical model.

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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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Research on Reliability Improvement Scheme of Network in smart Substation 1

引用

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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Simulation of Fast Cascading Failures Considering Voltage Ride Through Capability of Renewable Generation

Simulation of Fast Cascading Failures Considering Voltage Ri...

引用

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

作者： Dongbao Lv Shanshan Qiu Yujun Zhou Changgang Li Junjun Yang Wei Xu Xing Lei Changhui Ma Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China NARI Group Corporation State Grid Electric Power Research Institute Nanjing China State Grid Shanghai Municipal Electric Power Company Shanghai China Shandong Smart Grid Technology Innovation Center State Grid Shandong Electric Power Company Electric Power Science Research Institute Jinan China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

With the rapid development of renewable generation, the evolution process of fast cascading failures in the power system with a high proportion of renewable generation turns out to be more complicated. There are few existing fast cascading failure models that take into account the voltage ride through (VRT) capability of renewable generation. The portrayal of the dynamic characteristics of renewable generation still needs to be improved. In response to this, the VRT control model and VRT protection model have been established to comprehensively depict the output characteristics and disturbance tolerance capability of renewable generation in fast cascading failures. Finally, the simulation results of the AC-DC hybrid receiving-end system with a high proportion of renewable generation show that the established models can effectively depict the influence of VRT capability of renewable generation in fast cascading failures, providing a more comprehensive basis for the analysis of fast cascading failures under the access of a high proportion of renewable generation.

关键词： Renewable energy sources Voltage fluctuations Simulation power system protection power system dynamics System integration Delays power system faults Voltage control Transient analysis

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