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

共 375 条记录，以下是31-40 订阅

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Compressed Sensing Algorithm for Short Data Window in Distribution Network 1

引用

7th Purple Mountain Forum on smart Grid protection and control, PMF2022

作者： Cao, Yuhan Wu, Tonghua Chen, Wei Zeng, Xiang Luo, Bing Huazhong University of Science and Technology Wuhan China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing211106 China

ISBN: (数字)9789819900633

ISBN: (纸本)9789819900626

To effectively cope with the problems of surging data volume, high data acquisition cost, and congested communication transmission in distribution networks containing distributed new energy sources, this paper proposes a short data window data acquisition and intercommunication scheme based on compressed sensing theory and builds a corresponding model with the distribution network longitudinal differential protection data intercommunication process as a specific research scenario. The paper analyzes the shortcomings of the Gaussian random matrix, a universal observation matrix commonly used in traditional compressive sensing, in the distribution network, and constructs a deterministic matrix for the current signal characteristics of the distribution network to solve the problem of data reconstruction in the application of compressive sensing in the field of the power system. The problem of unstable recovery is solved. In addition, a sparse base satisfying the constrained isotropy condition is selected from the commonly used sparse bases for the constructed deterministic observation matrix, and a tracking algorithm with unbiased estimation is combined to design a targeted data compression reconstruction algorithm that can apply the compressive sensing theory to the distribution network longitudinal differential protection information intercommunication scenario in a more suitable way. This algorithm has a significant improvement in reconstruction accuracy, and the reconstruction time is short and adaptable to the real-time current signal of the distribution network. © state Grid Electric Power Research Institute 2023.

关键词： Compressed sensing

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Analysis of Ultra-low Frequency Oscillation Stability of Power Systems 6

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

引用

6th International Conference on Power and Energy Technology, ICPET 2024

作者： Cai, Kesu Liu, Dongsheng Zhao, Wenshuo Hong, Xi Yin, Yao Fei, Xuanqu 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: (纸本)9798350375855

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. © 2024 IEEE.

关键词： Damping

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Fuzzy Adaptive PI Circulating Current Suppressing control for MMC-HVDC 6

Fuzzy Adaptive PI Circulating Current Suppressing Control fo...

引用

6th IEEE Information Technology, Networking, Electronic and Automation control Conference, ITNEC 2023

作者： Chao, Wujie Huang, Junwei Deng, Chaoping Dai, Liyu State Grid Fujian Electric Power Research Institute Fuzhou350007 China Fujian Key Laboratory of Protection and Operation Control for Smart Grid 350007 China

ISBN: (纸本)9781665460033

Recent years, modular multilevel converter (MMC) is one of the most promising topologies applied to high voltage direct current transmission (HVDC). In order to solve the circulating currents caused by structural defects of MMC, a fuzzy adaptive PI circulating current suppressing controller is proposed based on mathematical model of MMC and functioning fuzzy subset inference method: The fuzzy number is calculated according to the error of system state, error variation, membership function and fuzzy control rules;The center of gravity method is used for defuzzification, and finally the PI parameters are modified. Finally, the PSCAD/EMTDC simulation model with fuzzy adaptive PI controller is established. The results show that the fuzzy adaptive PI circulating current suppressing controller is effective for MMC-HVDC. © 2023 IEEE.

关键词： controllers

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Multi-dimensional Quantitative Evaluation of Fault Transient Characteristic Accuracy of DFIG Farm Equivalent Model 5

Multi-dimensional Quantitative Evaluation of Fault Transient...

引用

5th International Conference on Electrical Engineering and control Technologies, CEECT 2023

作者： Jiang, Hao Xu, Lixiong Cui, Xiaodan Wu, Jialong Feng, Jiaqi Zheng, Zixuan Sichuan University School of Electrical Engineering Chengdu China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing China

ISBN: (纸本)9798350342253

An accurate wind farm model is a crucial prerequisite to ensure that the simulation results of the power system containing wind power align with reality. Hence, it is imperative to establish a system for evaluating the accuracy of wind farm models. This paper examines the fault response characteristics of wind turbines and proposes a multi-dimensional quantitative index system for assessing the equivalency of wind farm models. The entire process can be segmented into two stages: the transient period immediately following the fault occurrence and the subsequent steady-state phase. The evaluation indexes for assessing the accuracy of wind farm models are voltage dynamic response, active power dynamic response, and reactive power dynamic response. These indexes are formulated to evaluate the equivalency of wind farm models across various stages. © 2023 IEEE.

关键词： Dynamic response

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Transient Response Characteristics Analysis of DFIG under Symmetric Voltage Sudden Changes in the Grid

Transient Response Characteristics Analysis of DFIG under Sy...

引用

2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

作者： Jiang, Hao Xu, Lixiong Cui, Xiaodan Liu, Yang Wu, Jialong Feng, Jiaqi School of Electrical Engineering Sichuan University Chengdu China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing China

ISBN: (纸本)9798350322699

Large-scale grid-connection of wind power has a profound impact on the characteristics of power grids. To study the mechanism of the influence of voltage sudden changes on the transient response characteristics of double-fed wind fields is the basis of ensuring the safe and stable operation of power grids. In this paper, the expression of rotor current under symmetrical voltage sudden changes is derived, and the related factors affecting the transient response characteristics of rotor current are analyzed. Then, a detailed DFIG model is built in PSCAD, and a variety of scenarios are simulated to verify the accuracy of the proposed doubly-fed fan's transient response characteristics under symmetrical voltage sudden changes. © 2023 IEEE.

关键词： DFIG transient characteristics Voltage sudden changes

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Design and Verification of a DC Direct-mounted Energy Storage Topology 7

Design and Verification of a DC Direct-mounted Energy Storag...

引用

7th IEEE Information Technology, Networking, Electronic and Automation control Conference, ITNEC 2024

作者： Huang, Junwei Chao, Wujie Deng, Chaoping Dai, Liyu Wang, Jinke Electric Power Research Institute of State Grid Fujian Electric Power Co. Ltd. Fuzhou China Fujian Key Laboratory of Smart Grid Protection and Operation Control Fuzhou China

ISBN: (纸本)9798350370782

The modular multilevel converter based battery energy storage system (MMC-BESS) has the problem of pulsating current affecting battery life, and the high cost of retrofitting traditional modular multilevel converter (MMC) stations. The proposed DC direct-mounted energy storage topology in this paper is battery friendly and required number of battery cells is only 1/6 of MMC-BESS, greatly saving costs. This paper analyzes the topology structure and working principle of DC direct-mounted energy storage devices, and proposes a design method for the DC direct-mounted energy storage devices. The proposed design method is validated through simulation and prototype experiments. The simulation and construction of a DC 750V prototype have verified that the prototype has achieved good charging and discharging functions for DC energy storage, with small fluctuations in DC grid connected current and good power control effect. This study can provide reference and guidance for the design and application of high-voltage and high-capacity direct current energy storage devices that support offshore wind power to move towards the deep sea in the future. © 2024 IEEE.

关键词： Battery storage

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Evaluation and Management of Operation state of Distribution Station Area Based on Incentive Demand Response 1

引用

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

作者： Jin, Peng Wu, Hai Hu, Guo Shen, Qian State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing211106 China

ISBN: (数字)9789811671562

ISBN: (纸本)9789811671555

The popularization and promotion of smart home appliances and electric vehicles represents a challenge as well as an opportunity for distribution system operators. On the one hand, these new loads will significantly increase the operating burden of the distribution area;on the other hand, the controllability of these new devices also makes it possible to meet various technical and commercial purposes through flexible solutions such as incentive demand response. Based on the massive operation data collected from electricity meters, low-voltage fault indicators, leakage protection units and other devices in the distribution station area, a fuzzy comprehensive evaluation method is proposed to manage the operation status of low-voltage circuit in distribution station area. Then the evaluation results are applied to the incentive demand response, which realizes the comprehensive management of three-phase unbalance and under-voltage of low-voltage circuit in distribution station area through reducing load. The simulation results show that the proposed strategy can quantitatively evaluate the operation status of the distribution station area, and improve the load distribution and voltage level of distribution station area significantly through utilizing incentive demand response. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Domestic appliances

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An Improved Single-Phase Fault Line Selection Method for Non-effectively Grounded System Based on Transient Energy 6th

An Improved Single-Phase Fault Line Selection Method for Non...

引用

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

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

ISBN: (纸本)9789811671555

The domestic distribution network is mainly non-effectively grounded system, single-phase grounding fault accounts for more than 80% of the total number of faults, the fault characteristics are not obvious and easy to be affected by noise signals, at the same time, the polarity of zero sequence voltage and current transformer is unknown or reverse connection often occurs, which makes the local fault identification and line selection more difficult, and directly affects the fault response speed and disposal efficiency. In this paper, an improved single-phase to ground fault line selection method based on transient energy is proposed. By using the energy matching degree of transient zero mode current in each interval and the polarity relationship between transient zero mode current and steady-state zero sequence current in this interval, the existing fault line selection methods are easy to be affected by the polarity of external mutual inductors, and the polarity of mutual inductors can’t be checked online in the fault process. The physical concept of the method is clear, and the criterion threshold is not affected by the grounding mode and fault location of the system. RTDS simulation experiment and field engineering application verify the effectiveness and universality of the proposed fault line selection method. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Electric grounding

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Research and Application of Configuration Animation Technology for Power Grid Dispatching and control Systems Based on CIM/G 7th

Research and Application of Configuration Animation Technolo...

引用

7th Purple Mountain Forum on smart Grid protection and control, PMF2022

作者： Yan, Zhen Xu, Hua Lv, Zhimeng Yin, Xia Bao, Xiongwei Huang, Kun Nanjing211106 China NARI Technology Co. Ltd Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

ISBN: (纸本)9789819900626

For the current traditional power grid dispatching and control system, the display effect of configuration software interface is ordinary, and the configuration interface is cumbersome. This paper presents a state animation technology of configuration software for power grid and control system. By defining multiple states in the configuration editor, modifying component attributes in different states, setting state switching animation types, associating the animation change functions of component attribute values in different states, saving in CIM/G format, and then opening the corresponding files through the browser, the component attributes can be dynamically transformed between attribute values in different states, Batch modification and animation of component attributes are realized, which enriches the display effect of the interface and improves the friendliness of human-computer interaction. © state Grid Electric Power Research Institute 2023.

关键词： control systems

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Research on Hybrid Active Power Filter and Its control and protection System for LCC-HVDC 11

Research on Hybrid Active Power Filter and Its Control and P...

引用

11th Joint International Information Technology and Artificial Intelligence Conference, ITAIC 2023

作者： Chao, Wujie Dai, Liyu Huang, Junwei Chen, Mingquan State Grid Fujian Electric Power Research Institute Fuzhou350007 China Fujian Key Laboratory of Protection and Operation Control for Smart Grid Fuzhou350007 China

ISBN: (纸本)9798350333664

Filters are key equipment in LCC-HVDC projects. It filters out characteristic harmonics generated by the converter and prevents the effect of harmonics generated by converters on the AC power grid. Currently, most DC transmission projects use passive filters. The first use of hybrid active power filters in the Fujian Guangdong DC interconnection project. This paper introduces the application framework, theory, control and protection system design of hybrid active power filters in LCC-HVDC projects. © 2023 IEEE.

关键词： Characteristic harmonics control and protection Hybrid active power filters LCC-HVDC

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