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

共 427 条记录，以下是161-170 订阅

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Attack-Aware Capability Assessment Method Based on Specific Semantic Search

Attack-Aware Capability Assessment Method Based on Specific ...

引用

International Conference on Electronic Engineering and Informatics (EEI)

作者： Daojuan Zhang Qi Zhao Yuman Wang Shu Li Zheng Tian Yizhen Sun State Grid Laboratory of Power Cyber-Security Protection and Monitoring Technology State Grid Smart Grid Research Institute co. Ltd Beijing China Hunan Provincial Key Laboratory of Internet of Things in Electricity State Grid information & Communication Company of Hunan Electric Power Corporation Changsha China

ISBN: (数字)9798350353594

ISBN: (纸本)9798350353600

In this paper, we propose an attack perception capability assessment method based on the specific semantic search for the problem of attack perception capability assessment of security protection equipment for power monitoring systems. The method aims to improve the recognition and localization accuracy of common attacks by accurately correlating the output products of security equipment with the execution of attack test cases. The research employs an attack-specific semantic generation technique that combines attack attribute values with timestamps to form specific semantics for subsequent matching. Pattern matching algorithm, specifically the BM (Boyer-Moore) algorithm, is further utilized to match the specific semantics with the output products of the security device Snort to achieve attack localization. Experimental results demonstrate that Snort exhibits high accuracy in perceiving the majority of attack types and exhibits an enhanced perception rate compared to certain baseline methods. In summary, the method proposed in this paper effectively improves the sensing ability of security equipment to attacks on the power monitoring system and provides a new idea for the performance evaluation of security protection equipment.

关键词： Location awareness Performance evaluation Accuracy Semantic search Sensors Security protection Informatics Monitoring Pattern matching

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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...

引用

International Conference on Electronics Technology (ICET)

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

ISBN: (数字)9798350363951

ISBN: (纸本)9798350363968

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.

关键词： Couplings Low voltage Time-frequency analysis Grounding Electric shock Voltage Power system stability

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Real-Time Transaction Prediction Method Based on Generalized Tie-Line 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： Zhang, Yantao Jiang, Jingxiao Tu, Mengfu Xu, Fan Wang, Wen Nanjing Jiangsu211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing Jiangsu211106 China

ISBN: (数字)9789811597466

ISBN: (纸本)9789811597459

In order to cope with the rapid development of renewable energy in the Northwest Power grid, it is an urgent need to predict the renewable energy consumption capacity and transaction needs of the provinces, and promote the timely consumption of renewable energy within and between provinces. Therefore, this paper proposes a real-time transaction prediction method based on the generalized tie-line. Based on the definition of generalized tie lines, a multi-objective optimization model is established. The optimization objectives include positive and negative reserve of the provincial power grid and generalized positive and negative reserve of the main and sub-control areas. The method analyzes the power transmission and reception capacity and power transmission and reception needs of the main and sub-control areas in the next few hours, calculates the power purchase and sales capacity among the provinces, and automatically generates intra-provincial replacement and inter-provincial transaction plan based on the transaction rule library to enhance the intelligence level of renewable energy consumption in the Northwest Power grid. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Forecasting

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Analysis of Ultra-low Frequency Oscillation Stability of Power Systems

Analysis of Ultra-low Frequency Oscillation Stability of Pow...

引用

International Conference on Power and Energy Technology (ICPET)

作者： Kesu Cai Dongsheng Liu Wenshuo Zhao Xi Hong Yao Yin Xuanqu Fei State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation State Grid Electric Power Research Institute NanJing China School of Electrical Engineering and Electronic Information Xihua University Chengdu China

ISBN: (数字)9798350375855

ISBN: (纸本)9798350375862

The Low-Frequency Oscillation (LFO), Ultra-Low Frequency Oscillation (ULFO) and other oscillation can endanger the safety and stability operation of the power grid. However current relevant standards only have clear provisions on the critical damping ratio of LFO. Based on the risk of ULFO in high proportion hydropower systems, the principle and key influencing factors of ULFO are derived theoretically. According to the characteristics and hazards of ULFO, a method for determining the critical damping ratio of ULFO is explored, and the effectiveness of the method is tested through the actual response trajectory.

关键词： Damping Stability criteria Hydroelectric power generation Power system stability Attenuation Power grids Hazards Trajectory Oscillators Standards

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grid Forming Energy Storage System Based on Improved Sliding Mode Control

Grid Forming Energy Storage System Based on Improved Sliding...

引用

Clean Energy and Electric Power Engineering (ICCEPE), International Conference on

作者： Jiatian Gan Jun Yang Shichang Zhao Dongsheng Li Zhou Ding Xiaoling Su State Grid Qinghai Electric Power Research Institute Xining China Key Laboratory of Smart operation of new energy power system Ministry of Education Qinghai University Xining China

ISBN: (数字)9798350390315

ISBN: (纸本)9798350390322

The grid type converter can provide voltage and frequency support for the power grid. However, conventional nonlinear control strategies for grid connected converters are difficult to achieve high-precision current and voltage control. Therefore, this article first establishes a VSG control mathematical model for grid connected converters, and designs active and reactive power regulation schemes for grid connected converters based on primary frequency regulation and primary voltage regulation. Secondly, a grid forming energy storage system based on sliding mode control (SMC) was designed, and an improved SMC control was added to the current inner loop to improve the response speed and control accuracy of the grid connected converter. The sigmoid function was improved to reduce SMC control chattering. Finally, a simulation model was built on the Matlab/Simulink platform to verify the correctness and effectiveness of the control strategy.

关键词： Resistance Reactive power Mathematical models Regulation Voltage control MATLAB Synchronous machines Sliding mode control grid forming Energy storage

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Comparison of Adaptive Virtual Impedance Coefficient to Suppress Power Oscillation in Multi-VSG grids

Comparison of Adaptive Virtual Impedance Coefficient to Supp...

引用

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

作者： Jie Ji Xingshuo Li Shuye Ding Yizhi Chen School of Electrical and Automation Engineering Nanjing Normal University Nanjing China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China

ISBN: (数字)9798350386127

ISBN: (纸本)9798350386134

The virtual synchronous generator(VSG) technology offers inertia support but also introduces active power oscillation, which are more serious when in multi-VSG. The previous studies proposed adaptive virtual impedance aimed at suppressing power oscillation in multi-VSG system. However, further research is still needed to thoroughly examine the adaptive virtual impedance coefficient. In this article, how the power oscillation of multi-VSG to be influenced by adaptive virtual impedance coefficient is investigated. Firstly, an analysis is conducted on the active power oscillation mechanism. Subsequently, the variation law of adaptive virtual impedance coefficient affecting active power oscillation is studied. Finally, The effects of different adaptive virtual impedance coefficient values is compared in simulations and experiment.

关键词： Adaptation models Adaptive systems Impedance Frequency synchronization Oscillators Frequency control

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An Feature Data Extraction Method Based on BPCA-SPCA

An Feature Data Extraction Method Based on BPCA-SPCA

引用

International Conference on Sensing, Diagnostics, Prognostics, and Control (SDPC)

作者： Xiangyu Xing Bingrong Yan Yan Su Lingyun Tang College of Civil Aviation Nanjing University of Aeronautics and Astronautics Nanjing China Nari Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (数字)9798350388855

ISBN: (纸本)9798350388862

With the increasing integration of systems and the rapid development of sensor monitoring technology, the types of monitoring data are more diverse and the number of samples are larger in flight test and operation than before. Due to the large volume and high complexity of monitoring data, the system fault diagnosis and prediction based on monitoring data is inefficient. In order to solve the problem of monitoring data redundancy, a feature extraction algorithm based on BPCA-SPCA is proposed. A system with high failure rate is selected as an example to extract the features of the system monitoring data and realize the verification of data sparseness. The experimental results show that based on BPCA-SPCA the principal components extracted monitoring data can effectively express the features of the original data, and the feature sparse vector can provide effective input information for subsequent fault diagnosis and indirectly improve the efficiency of fault diagnosis.

关键词： Fault diagnosis Redundancy Feature extraction Prediction algorithms Vectors Inference algorithms Sensors Complexity theory Data mining Monitoring

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Simulation Study of the Attenuation of Corona Current Pulses on 1000kV UHVAC Overhead Transmission Lines

Simulation Study of the Attenuation of Corona Current Pulses...

引用

IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Huichu Xie Wei Deng Weidong Liu Yao Lu State Key Laboratory of Power Grid Environmental Protection China Electric Power Research Institute Wuhan China State grid Hunan extra high voltage substation company State Grid Hunan Electric Power Co. Ltd Changsha China Substation intelligent operation and inspection laboratory State Grid Hunan Electric Power Co. Ltd Changsha China

ISBN: (数字)9798331517540

ISBN: (纸本)9798331517557

The attenuation of corona current pulses in overhead transmission lines is key to understanding radio frequency interference. Previous studies focused on specific frequency spectra and complex calculations, lacking practical engineering applicability and time-domain pulse attenuation data. This article uses typical positive and negative corona current pulse waveform and ATP-EMTP program to simulate the attenuation of these pulses on 1000kV UHVAC overhead transmission lines, and obtained the corresponding attenuation law. This simulation method can quickly assess corona current pulse attenuation for any overhead transmission line.

关键词： Electrical engineering Time-frequency analysis Power transmission lines Asia Voltage Attenuation Corona Software Time-domain analysis Radiofrequency interference

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Capacitance Current Compensation Method for Cable-Overhead Hybrid Transmission Lines 5th

Capacitance Current Compensation Method for Cable-Overhead H...

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： Yao, Gang Wu, Tonghua Zheng, Yuping Teng, Xianliang Hong, Feng Chen, Guozhou NARI Group Corporation Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

ISBN: (纸本)9789811597459

At present, the capacitance current compensation technology for transmission line differential protection is based on uniform parameters of entire lines, so it cannot be adapted to cable-overhead hybrid transmission lines. In this paper, a steady-state compensation method based on segment parameters, a time-domain compensation method based on whole line equivalent parameters and a time-domain compensation method based on segment parameters are proposed, which can adapt to different application scenarios, such as hybrid lines with shunt reactance at the ends and junctions. A PSCAD/EMTDC simulation shows that when a hybrid transmission line is short, the time-domain compensation method based on whole line equivalent parameters is simple to implement, and it can effectively compensate the capacitance current of hybrid transmission lines. The time-domain compensation method based on segment parameters can accurately compensate the capacitance current of hybrid transmission lines, taking into account the reliability and sensitivity of differential protection. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Cables

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Output Voltage Characteristics Analysis for the Starting Process of Proton Exchange Membrane Fuel Cell

Output Voltage Characteristics Analysis for the Starting Pro...

引用

Energy Engineering and Power Systems (EEPS), International Conference on

作者： Haiguo Yu Chunlai Li Pengcheng Zhang Ning Zhang Jiatian Gan Xiaoling Su State Grid Qinghai Electric Power Company Xining China State Grid Qinghai Electric Power Research Institute Xining China Key Laboratory of Smart operation of new energy power system Qinghai University Ministry of Education Xining China

ISBN: (数字)9798350366914

ISBN: (纸本)9798350366921

In order to analyze the voltage variation and voltage undershoot phenomenon of Proton Exchange Membrane Fuel Cell (PEMFC), this paper develops its gas pressure and thermodynamic model based on the empirical model and electrochemical model, considering reaction gas pressure and battery temperature changes. First, the impact of reaction gas pressure and battery temperature changes on voltage output law of PEMFC is analyzed according to its electrochemical equivalent circuit model. Second, the start-up process of PEMFC is simulated by the change of load current, as well as the voltage undershoot phenomenon, output response to thermodynamic electromotive force, activation overpotential, ohmic overpotential and concentration overpotential which determines the output voltage. Finally, based on Matlab-Simulink simulation platform, the dynamic change model of PEMFC system is established to verify the PEMFC model.

关键词： Electrodes Analytical models Thermodynamics Voltage Mathematical models Batteries Time factors Integrated circuit modeling Current density Load modeling

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