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

共 395 条记录，以下是201-210 订阅

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Energy Storage Planning and Economic Dispatch of Microgrid Considering Power to Gas 12

Energy Storage Planning and Economic Dispatch of Microgrid C...

引用

12th IEEE PES Asia-Pacific Power and Energy Engineering Conference, APPEEC 2020

作者： Gu, Jiaqi Mei, Fei Lu, Jixiang Lu, Jinjun Yang, Bo Hohai University College of Energy and Electrical Enginering Nanjing China Nari Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China China Electric Power Research Institute Nanjing China

ISBN: (纸本)9781728157481

New energy has been vigorously promoted for its advantages such as cleanliness, large reserves and renewability. Recently, power-to-gas (P2G) technology has provided a new idea for energy conversion, which helps to improve energy efficiency. In view of the current high penetration rate of photovoltaics, the impact of three measures with regard to energy conversion, energy storage configuration and demandside response on the economics of the microgrid and the optimal scheduling of the microgrid are explored. Firstly, a microgrid scheduling model with P2G device is built;Secondly, a bi-level planning model for the economic cost of the microgrid scheduling is presented. The upper layer will be based on absolutely accommodation of photovoltaics as the prerequisite to conFigure the optimal energy storage capacity;Then lower layer performs optimized scheduling under the upper model to ensure the economy of the microgrid. Finally, a comparison example is used to analyze the optimal energy storage capacity in different scenarios and an optimized scheduling scheme is given. © 2020 IEEE.

关键词： Scheduling

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Scheduling Model for Inter-regional HVDC Tie-line Generation and Transmission System Considering Conditional Sections

Scheduling Model for Inter-regional HVDC Tie-line Generation...

引用

IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia)

作者： Fan Xu Rongzhang Cao Mengfu Tu Yantao Zhang Leyong Yang Dandan Zhang State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

The HVDC transmission schedule for clean energy seldom considers the demand of receiving grid. With the expansion of clean energy scale, it brings great pressure to the receiving grid for safe and stable operation. For this reason, a generation and transmission scheduling model of inter-regional HVDC tie-line system considering conditional section is proposed. A step power adjustment model for the HVDC tie-line operation optimization is developed with consideration given to various constraints on tie-line power, which not only give full play to the characteristics of HVDC tie-line that can be flexibly adjusted, but also avoid the frequent conversion of HVDC converter equipment, making the HVDC tie-line schedule more executable. The joint operation model of cascaded hydropower plants in sending grid is established to meet the operational constraints such as the restricted operating zones of hydropower units, and to ensure the priority of clean hydropower resources and the practicability of the hydropower schedule. The model of conditional control section is established, which can effectively deal with the problem of the coupling between the power limits of section and the number of running units, so as to ensure the safe and stable operation of related sections. Based on the actual data of a cross-regional interconnected power grid, the validity of the model is verified, which can promote the accommodation of clean energy across a wide range of regions, reduce the supply cost of large power system, and alleviate the pressure of safe and stable operation at the receiving system.

关键词： Hydroelectric power generation HVDC transmission Schedules smart grids Dispatching Vibrations

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A Method to Prevent and control the Interruption Exception of Sampling in Merging Unit

A Method to Prevent and Control the Interruption Exception o...

引用

Sustainable Power and Energy Conference (iSPEC)

作者： Rui Cao Zhaohui He Tonghua Wu Bin Zhou Zhonglang Wang Xindong Li State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

As the sampling interruption is the heartbeat of merging unit, its stability is directly related to the accuracy and discreteness of the output SV packets of merging unit. To prevent the output error from merging unit when its sampling interruption is abnormal, this paper proposes crystal frequency monitoring technology, sampling interruption monitoring technology and SV packets timing monitoring technology, forming the prevention and control system of sampling interruption exception of merging unit. The merging unit developed by above technology has the function of early warning and processing for the occasional sampling interruption exception, which improves the reliability of intelligent substation operation.

关键词： Substations Heart beat Merging Crystals Reliability engineering Synchronization Monitoring

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Research and Demonstration Application of On-line monitoring and evaluation technology for primary frequency regulation in Renewable Energy Power Station

Research and Demonstration Application of On-line monitoring...

引用

2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Liu, Dong Wang, Bo Shan, Xin Lu, TingXiang Ling, XiaoBo Tan, ZhenNing Zhu, JingKai Huang, Sheng Wang, ZhiHua 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 State Grid Shanghai Municipal Electric Power Company Shanghai200010 China

ISBN: (纸本)9781728135205

When the renewable energy power station is included, the primary frequency regulation(PFR) of the grid can make a big difference. New control methods are proposed to accommodate this *** this case,we propose an on-line monitoring and evaluation method which based on PMU dynamic data for PFR of renewable energy power station. Firstly, the characteristics of the PFR of the renewable energy power station are expounded. Secondly, quantitative evaluation indicators of PFR are proposed. Finally, the concrete implementation method and an application example are introduced. The method has been applied in practice and has obtained good application results. © 2019 IEEE.

关键词： Phasor measurement units

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Metallic Short Circuit Fault Location Algorithm Considering Capacitance Current based on Differential Equation

Metallic Short Circuit Fault Location Algorithm Considering ...

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International Conference on Power System Technology (POWERCON)

作者： Huirong Liu Yuping Zheng Tonghua Wu Feng Hong Wei Dai Xindong Li State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China

ISBN: (纸本)9781665407380

Capacitance current has significant effect on long-distance fault of high-voltage transmission line, and the current single-ended quantity location algorithm can hardly eliminate the effect of capacitance current under the power frequency. To reduce capacitance current’s effect on location algorithm, this paper builds metallic grounding fault model based on RLC type circuit, takes fault location as the unknown variable, builds a mathematical location model within time domain applicable for taking account of capacitance current, and obtains the quadratic equation with one unknown for fault location. Then it substitutes the two independent variables for the linear term and quadratic term, solves independent variables through linear equation, and proves the solution exists and is unique. Then under analysis on the same difference error, it compares magnitude of error generated during calculation of the two independent variables, it corrects difference error first, and inversely solves fault location by selecting the numerically disturbed smaller independent variable. Simulation results indicate the algorithm can accurately take account of effect of capacitance current under different metallic fault conditions, and solve fault location in a stable and accurate manner.

关键词： Time-frequency analysis Power transmission lines Simulation RLC circuits Fault location Capacitance Mathematical models

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Support System for operation Status Awareness and Troubleshooting of UHVDC Transmission System

Support System for Operation Status Awareness and Troublesho...

引用

2018 International Conference on Advanced control, Automation and Artificial Intelligence (ACAAI2018)

作者： Jinjun Lu Xin Shan Yi Wang Xi Xu NARI Technology Co.Ltd. State Key Laboratory of Smart Grid Protection and Control

The transmission capacity of ultra-high voltage direct current(UHVDC) transmission system is huge. Once a fault occurs, it will bring tremendous impact on the operation of the power grid, bring about a number of problems such as power flow overload, insufficient reserve, and frequency drop, and induce chain failure. Therefore, it is necessary to adopt a comprehensive Precautions. This article describes the specific ideas and implementation methods of solving problems from the overall solutions to the handling of UHVDC faults, the risk assessment and prevention in advance, the real-time monitoring of events, and the assistance in emergency recovery *** method mentioned above has been operated in some regional and provincial power companies for demo purpose, and has played an important role in the handling of DC blocking events many times.

关键词： Ultra-high voltage direct current(UHVDC) Risk assessment Assistance decision Preventive control Real-time monitoring

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Non-intrusive monitoring and disaggregation of industrial load based on Petri net theory

Non-intrusive monitoring and disaggregation of industrial lo...

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第三届材料科学应用与能源材料国际研讨会

作者： Wei Zheng Jie Yu Hongjie Tian Peng Li Chenning Wu Mengfu Tu School of electrical engineering Southeast University State Key Laboratory of Smart Grid Protection and Control

In this paper, the non-intrusive monitoring and disaggregation method of industrial load based on Petri net theory is studied. First, the basic concepts of Petri nets are introduced. On the basis of prototype Petri nets, time factor is added. Then, the Petri net with time factor is combined with industrial load production process. Considering the production sequence, start-stop time and production time constraints of industrial load, a non-intrusive monitoring and disaggregation model of industrial load is constructed. Finally, according to the actual production process of industrial load, the electricity consumption situation of each production link is calculated, and the detailed analysis results of industrial user's electricity consumption behavior are obtained. The research could provide an important reference for realization of friendly interaction between industrial users and power grid.

关键词： Non-intrusive monitoring and disaggregation of industrial load based on Petri net theory Petri net

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A Fast Blocking Method of Bus protection when CT Disconnected Based on Braking Current and Zero Sequence Current

A Fast Blocking Method of Bus Protection when CT Disconnecte...

引用

2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Wang, Yincheng Zhu, Jie Dai, Wei Zhu, Xiang Wang, Xiaohong Zhang, Kaiyu NARI Technology Co. Ltd NARI Group Corporation Nanjing China Maintenance Company of State Grid Tibet Electric Power Co. Ltd State Grid Tibet Electric Power Company Lhasa China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China

ISBN: (纸本)9781728191645

Current transformer (CT) disconnection of bus is prone to maloperation of bus differential protection. The existing criteria for CT disconnection do not fully consider the distinction between heavy load high impedance fault and external metal fault transfer to internal high impedance fault. And not fully consider the influence of one-half wiring circulation and unbalanced impedance on CT disconnection zero sequence criterion. Based on the theoretical analysis of the characteristics of braking current variation and zero sequence current distribution in the event of internal fault, this paper puts forward a fast blocking criterion of CT disconnection based on braking current and zero sequence current, and carries out simulation verification. Both the theory and the simulation show that there is a drop of braking current in the event of internal fault. The distribution of zero sequence current in the event of CT disconnection is obviously different from that in the event of internal fault. The criterion proposed in this paper can effectively and reliably distinguish CT disconnection from internal fault. © 2020 IEEE.

关键词： Transformer protection

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Research on control Strategy and Simulation of MMC-HVDC System Based on Battery Energy Storage System

Research on Control Strategy and Simulation of MMC-HVDC Syst...

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Electrical Engineering and control Science (IC2ECS), International Conference on

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

This paper presents a method of applying MMC based on battery energy storage system (BESS) to HVDC system to realize power decoupling control on AC and DC side. Firstly, the basic structure and working principle of MMC-HVDC system based on BESS are analyzed. Then, based on the mathematical equivalent model, the MMC-BESS decoupling control method based on DC power control is derived, and the AC-DC power decoupling control is realized. Finally, a +400kV MMC-HVDC system is built on the RTDS platform, and the proposed control strategy and power decoupling effect are verified. The results show that the MMC-BESS control strategy proposed in this paper is effective. The MMC-HVDC system based on BESS can realize active power decoupling control between AC side and DC side, and the unbalanced power between AC side and DC side can be compensated by the charge and discharge of BESS.

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Research on Chinese Word Segmentation Algorithm based on Dictionary and Statistical Method and Its Application in the field of Power grid control

Research on Chinese Word Segmentation Algorithm based on Dic...

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作者： Chao Shen Jinxia Dai Mengge Mao Kun Zhao Zhen Yan Kun Huang NARI Group Corporation (State Grid Electric Power Research Institute) State Key Laboratory of Smart Grid Protection and Control

In view of the particularity of Chinese word segmentation in the professional field of power grid regulation,the performance of Chinese word segmentation based on traditional statistical algorithm is frequently limited by the corpus training in the proprietary field,and the insufficient ability of Chinese word segmentation based on dictionary algorithm in identifying new words and disambiguation in the proprietary *** paper proposes a Chinese word segmentation method based on the combination of dictionary and statistical method,and applies it to the application scenario of querying the operation status of power *** method constructs a professional dictionary in the field of power grid regulation by using the Double-Array Tree storage *** using the CRF(Conditional Random Fields)train the text data to generate the model file,and the FMM(Forward Maximum Matching) method is used for Chinese word segmentation combined with the professional dictionary in the field of power grid regulation.A fast and accurate online word segmentation method in the field of power grid regulation is designed and implemented,it performs well in some main performance *** the application scenario of querying the power grid operation status,the Chinese word segmentation results obtained by this method combined with the standard query sentence pattern realize the rapid classification of application scenario query and the accurate execution of operation commands,greatly improve the efficiency and accuracy of querying the power grid operation status,and improve the human-computer interaction experience.

关键词： Chinese word segmentation Dictionary Statistical methods Scenario application of power grid regulation

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