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

共 394 条记录，以下是181-190 订阅

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Instantaneous Frequency Measurement and Tracking under Out of Step Oscillation 7

Instantaneous Frequency Measurement and Tracking under Out o...

引用

7th International Conference on smart grid and smart Cities, ICSGSC 2023

作者： Cai, Ke Su Zhang, Gan Feng Ji, Rong Rong Zheng, Sui Sheng Xia, Cheng Lin Lan, Tian Yu State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation NanJing China Ultra High Voltage Branch Company State Grid Zhejiang Powe Company HangZhou China Nari Group Corporation State Grid Eelectric Power Research Institute NanJing China

ISBN: (纸本)9798350305913

As an important operating parameter of the power system, the instantaneous frequency of the current can reflect the actual operating state of the current system, especially when the system is out of step. The characteristics of the current in the oscillation line are analyzed in this paper. An algorithm for measuring instantaneous frequency of current while power system swings is presented, based on the broad definition of angular frequency. According to the feature of the actual power system, a new method for measuring the instantaneous current frequency by real-time sampling is proposed. Finally, the algorithm is simulated on the model of the equivalent systems. When the system swings, the real-time frequency is gained by sampling the current in the line, combined with the frequency of the equivalent machine of both sides. It shows that the obtained current frequency is reasonable and effective, compared to the characteristics of the system. © 2023 IEEE.

关键词： angular frequency instantaneous frequency oscillation sampling

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DC operating circuit anomaly detection based on node voltage unsupervised time series 2

DC operating circuit anomaly detection based on node voltage...

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2nd International Conference on New Energy and Power Engineering, ICNEPE 2022

作者： Zhang, Shen Qi Yuan, Wei Yi, Ran Chen, Li State Grid NanTongPower Supply Company Jiangsu NanTong226000 China NARI Technology Nanjing Control Systems Co. Ltd Jiangsu Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing211106 China

With the increase in power system load, the number of switch cabinets increases rapidly, and the accidents caused by DC operating circuits become more and more obvious. Abnormal detection has become an important part of the DC operating circuit. Abnormal data, mainly voltage measurement, often contain important information. Finding and analyzing these abnormal data can give early warning for circuit failure or failure. However, abnormal data is often difficult to obtain and lacks marks, that is, the problem of sample imbalance and unsupervised problems, resulting in abnormal detection methods that can not meet the increasing accuracy and efficiency requirements. Generative adversarial network (GAN) is an unsupervised deep learning model, which has been successfully applied to unsupervised time series anomaly detection. However, GAN has technical difficulties in the anomaly detection process, and there is still room for optimization in accuracy. In this paper, the unsupervised time series anomaly detection method based on GAN is studied, and an anomaly detection method of a DC operating circuit combined with LSTM and GAN is designed. © Published under licence by IOP Publishing Ltd.

关键词： Generative adversarial networks

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Simulation and Verification of Sub-synchronous Oscillation from Impedance Perspective-Taking a Wind Power Base in China as an Example 6th

Simulation and Verification of Sub-synchronous Oscillation f...

引用

6th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2021

作者： Xu, Guang Zhu, Ling Li, Jianhua Huang, Zhiguang Li, Zhaowei Hou, Yuqiang NARI Technology Co. Ltd Jiangsu Nanjing211106 China East China Grid Co. Ltd Shanghai200120 China State Key Laboratory of Smart Grid Protection and Control Jiangsu Nanjing211106 China

ISBN: (纸本)9789811671555

Recently, numerous sub-synchronous oscillations (SSO) events have occurred in many wind farms in China, which seriously threatened the power system security and stability. It is generally believed that the LC resonance between the wind farm side and the grid side with series compensation (SC) devices is one of the conditions that cause the SSO. This paper takes a real power grid as an example, reappeared the SSO events through electromagnetic simulation, analyzed the key influence factors, and proposes a strategy from impedance perspective in the end based on reasonable assumptions, in order to suppress the SSO shortly after the oscillations happened. Firstly, make off-line impedance analysis based on the deterministic grid structure, and then give the sensitivity results of each wind farm to the SSO. Finally, cut off the wind farm based on the sensitivity orders during the SSO. The simulation results were performed to verify the validity. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Electromagnetic simulation

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Mobile Energy Storage System Fleets Participated Active Distribution Network Restoration Model 37th

Mobile Energy Storage System Fleets Participated Active Dist...

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37th Annual Conference on Power System and Automation in Chinese Universities, CUS-EPSA 2022

作者： Meng, Na Wu, Han Sun, Liwen State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing21000 China Smart Grid Research Institute Nanjing Institute of Technology Nanjing211167 China

ISBN: (纸本)9789819914388

This letter proposes a novel coordinated network reconfiguration and mobile energy storage system (MESS) fleets dispatching model considering the uncertainty in DG output and load forecasts to increase the resilience of the active distribution network (ADN) after disasters. The MESS traveling strategy is modeled by an extended transit delay model. Then, a novel deterministic network restoration model incorporating the MESS, stationary energy storage system, distributed generation (DG), demand response (DR) and network reconfiguration is proposed and programmed using mixed integer linear programming. Then, an ellipsoidal uncertainty set is employed to describe the uncertainty of load and DG output forecasts and a robust network restoration model proposed based on the deterministic one. The proposed deterministic and robust network restoration models are verified on a 59-bus rural distribution system in China. © 2023, state grid Electric Power.

关键词： Energy storage

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A Method for Measuring Capacitive Current in Arc Suppression Coil Grounding System 2

A Method for Measuring Capacitive Current in Arc Suppression...

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2022 2nd International Conference on Energy, Power and Advanced Thermodynamic Systems, EPATS 2022

作者： Xia, Lei Wu, Hai Hu, Guo Hu, Song Nari Group Corporation State Key Laboratory of Smart Grid Protection and Control Jiangsu Nanjing211106 China NARI Technology Development Co. Ltd. Jiangsu Nanjing211106 China

With the rapid development of the national economy, the system cabling rate continues to improve, the system capacitive current continues to increase, and the arc suppression coil grounding method is more and more widely used. Among them, the pre adjustable turn adjustable arc suppression coil accounts for the highest proportion. How to accurately, quickly and real-time measure and calculate the capacitive current of the system is the foundation to realize the automatic tracking and compensation of the arc suppression coil, It is also the key to reliably extinguish the arc and reduce the influence range of the fault when the single-phase grounding fault occurs in the system. Based on the analysis of the variation law of the capacitive current in the distribution network neutral grounding system through the arc suppression coil, this paper proposes a new method for measuring the capacitive current based on the resonance point curve fitting, which is suitable for the pre adjustable turn adjustable arc suppression coil grounding system, and verifies its reliability and accuracy through simulation. © 2022 Institute of Physics Publishing. All rights reserved.

关键词： Curve fitting

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A Top-k QoS-Optimal Service Composition Approach Under Dynamic Environment 7th

A Top-k QoS-Optimal Service Composition Approach Under Dynam...

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7th International Conference on Artificial Intelligence and Security, ICAIS 2021

作者： Tian, Cheng Zhang, Zhao Yang, Sha Huang, Shuxin Sun, Han Wang, Jing Zhang, Baili School of Computer Science and Engineering Southeast University Nanjing211189 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China Nari Group Corporation Nanjing211106 China

ISBN: (纸本)9783030786083

To deal with low efficiency of existing Web service composition algorithms under dynamic environment, this paper proposes a Top-k QoS-optimal service composition algorithm based on QWSC-K static algorithm. The algorithm first considers the influence of dynamic environment on the existing service composition and service dependency graph, and classifies the changed services in dynamic environment. Moreover, different strategies are adopted to obtain the intermediate results of service composition for different categories of services. The influence of different service categories on the service dependency graph is analyzed to realize the updating of the service dependency graph. Finally, based on the updated service dependency graph and the intermediate results of the service composition, the adaptive incremental update can be applied to change the original service composition results, avoiding the time-consuming re-query process. Experiments show that the algorithm is efficient and accurate in dynamic environment. © 2021, Springer Nature Switzerland AG.

关键词： Quality of service

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Research on Inter-station 2M Communication protection Method Suitable for Stability control System 16th

Research on Inter-station 2M Communication Protection Method...

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16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Feng, Ke Chen, Xiong Wang, Wang Zhu, Kaiyang Lu, Yan Cai, Yupeng NARI Group Corporation/State Grid Electric Power Research Institute Nanjing210003 China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd Shenyang110004 China State Key Laboratory of Smart Grid Protection and Control Nanjing210003 China

ISBN: (纸本)9789811915314

The communication safety of the safety and stability control system has received more and more attention. This paper analyzes the risks and consequences of the inter-station communication in detail. Based on the special structure of the inter-station communication, a security and stability control system inter-station communication protection method is proposed. This method builds a complete communication management scheme by adding function codes, counting bits and check codes in the message, thereby realizing effective identification and protection of risk points such as communication interruption, information tampering, and playback attacks. The effectiveness and reliability of the method has been proved by the results of experiments. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Cryptography

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A quantitative evaluation method for the performance of primary frequency regulation of system resources

A quantitative evaluation method for the performance of prim...

引用

7th International Conference on Electronics Technology, ICET 2024

作者： Xuelian, Wu Fusuo, Liu Hui, Huang Hongli, Zhang Wei, Li Nari Group Corporation State Grid Electric Power Research Institute Power Grid Analysis and Consulting Department Nanjing China Nari Group Corporation State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and control Nanjing China

ISBN: (纸本)9798350363951

With large scale new energy power being connected to the grid, the frequency support capability of the system decreases gradually. In order to meet the regulation requirements of system frequency stability and lay the foundation for frequency stability coordination and optimization control, it is necessary to use reasonable quantitative evaluation indicators for primary frequency regulation performance. Firstly, the dynamic response characteristics of frequency modulation resources in load fluctuation scenarios and large power disturbance scenarios are analyzed separately. Then, by mastering the frequency response characteristics of the system considering primary frequency regulation in different scenarios, the key factors affecting the safety and stability characteristics of the system frequency are determined. Finally, a quantitative evaluation method for the primary frequency regulation performance of frequency modulation resources is proposed, and the applicability of the proposed evaluation method is verified based on typical scenario examples. © 2024 IEEE.

关键词： Frequency stability

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Evaluation Methods for the Degree of Interaction and Coupling between New Energy and DC

Evaluation Methods for the Degree of Interaction and Couplin...

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7th International Conference on Electronics Technology, ICET 2024

作者： Xuelian, Wu Fusuo, Liu Zhaowei, Li Hongli, Zhang Yening, Lai Nari Group Corporation State grid electric power research institute Power Grid Analysis and Consulting Department Nanjing China Nari Group Corporation State grid electric power research institute State Key Laboratory of Smart Grid Protection and control Nanjing China

ISBN: (纸本)9798350363951

The high proportion of new energy connected to multi-infeed direct current power system may cause large-scale new energy to enter low voltage ride-through and multiple DC commutation failures under severe grounding faults, and the interactive coupling effect may affect the subsequent recovery process. In response to this phenomenon, interactive indicators are proposed to evaluate the risk of simultaneous faults between DC and new energy during grounding faults, as well as coupling indicators to evaluate the risk of secondary faults during the recovery process of DC and new energy after grounding faults are cleared. Simulation analysis based on actual power grids shows that this indicator can evaluate the interactive coupling process between new energy low voltage ride-through and DC commutation failure intuitively. © 2024 IEEE.

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Research on Construction of Dispatching Knowledge Model of Power grid 5

Research on Construction of Dispatching Knowledge Model of P...

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5th International Conference on Energy, Electrical and Power Engineering, CEEPE 2022

作者： Qing, Zheng Dai, Zemei Zhu, Nanyang Yang, Chunxiang Si, Xiaofeng Zhang, Kaifeng Southeast University School of Automation Nanjing China Nari CO.LTD & Nari Technology CO.LTD State Key Laboratory of Intelligent Power Grid Protection and Operation Control Nanjing China State Grid GanSu Electric Power Company Gansu China

ISBN: (纸本)9781665479059

With the construction of the new power market, the tasks of dispatching operation in the power grid become more frequent, and the scenes of dispatching operation are more complicated. The existing dispatching operation system and the technology of decision in power grid cannot meet the requirements. Therefore, this work establishes a knowledge model of power grid dispatching to provide an efficient decision-making tool. This work extracts the benefits of historical operation scenarios and the regulation of dispatching of power grid, and establishes a joint knowledge model of power grid dispatching based on mining and extracting the benefits of historical operation scenarios and the regulation of dispatching of power grid by big data analysis technology and natural language processing technology. The joint knowledge model is essential for dispatcher to formulate more reasonable dispatching operations, reduce the difficulty of decision-making and lower the requirements for dispatchers, which ensures the safe operation of the power grid. © 2022 IEEE.

关键词： Analytical models Decision making Dispatching Power grids Natural language processing Data models Regulation

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