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Research on power electronic transformer applied in AC/DC hybrid distribution networks

Global Energy Interconnection 2018年第3期1卷 396-403页

作者： Yiqun Miao Jieying Song Haijun Liu Zhengang Lu Shufan Chen Chun Ding Tianzhi Cao Linhai Cai Yuzhong Gong State Grid Shanghai Municipal Electric Power Company State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute State Grid Jibei Electric Power Company Department of Electrical and Computer Engineering University of Saskatchewan

The AC/DC hybrid distribution network is one of the trends in distribution network development, which poses great challenges to the traditional distribution transformer. In this paper, a new topology suitable for AC/DC hybrid distribution network is put forward according to the demands of power grid, with advantages of accepting DG and DC loads, while clearing DC fault by blocking the clamping double sub-module(CDSM) of input stage. Then, this paper shows the typical structure of AC/DC distribution network that is hand in hand. Based on the new topology, this paper designs the control and modulation strategies of each stage, where the outer loop controller of input stage is emphasized for its twocontrol mode. At last, the rationality of new topology and the validity of control strategies are verified by the steady and dynamic state simulation. At the same time, the simulation results highlight the role of PET in energy regulation.

关键词： AC/DC hybrid distribution network power electronic transformer(PET) Clamping double sub-module(CDSM) Energy router

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Model Predictive Control of grid-connected Converter Based on Virtual Synchronous Machine 8

Model Predictive Control of Grid-connected Converter Based o...

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8th IEEE International Conference on advanced power System Automation and Protection, APAP 2019

作者： Li, Yanyan Li, Guohao Li, Qiang Jin, Nan Hu, Shiyang Guo, Leilei Liu, Jianshan Zhengzhou University of Light Industry College of Electrical and Information Engineering Zhengzhou China Chongqing University State Grid Hennan Electric Power Research Institute State Key Laboratory of Power Transmission Equipment System Security and New Technology China Hunan University College of Electrical and Information Engineering Changsha China

ISBN: (纸本)9781728117225

With the increase of distributed power generation integrated into the power grid through power electronic converters, the problem of inertia reduction in power system has been caused, a new control technology is needed to enable distributed power sources to actively participate in the voltage and frequency regulation of the grid. In this paper, a model predictive control (MPC) strategy based on virtual synchronous machine (VSM) for the grid-connected converter is proposed. The method does not require traditional pulse width modulation and current inner loop control. When the voltage and frequency of power grid change, the active power and reactive power can respond in time and simulate characteristics of traditional synchronous machine. The simulation results are given to verify the effectiveness of the control strategy presented above. © 2019 IEEE.

关键词： Model predictive control

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A Generic TC-Based Method to Find the Weakness in Different Phases of Masking Schemes

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Tsinghua Science and technology 2018年第5期23卷 574-585页

作者： Ming Tang Yuguang Li Yanbin Li Pengbo Wang Dongyan Zhao Weigao Chen Huanguo Zhang School of Cyber Science and Engineering Wuhan University Wuhan 430072 China State Key Laboratory of Cryptology Beijing 100878 China State Grid Key Laboratory of PICD & AT Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing 100080 China State Grid Xinjiang Electric Power Corporation Maintenance Company Urumqi 830002 China

Masking is one of the most commonly used Side-Channel Attack （SCA） countermeasures and is built on a security framework, such as the ISW framework, and ensures theoretical security through secret sharing. Unfortunately, the theoretical security cannot guarantee practical security, because several possible weaknesses may exist in the actual implementation. These weaknesses likely come from the masking schemes or are introduced by the implementation methods. Finding the possible weakness of the masking scheme is an interesting and important issue for real applications. In this paper, the possible weaknesses for masking schemes in Field- Programmable Gate Array （FPGA） design are discussed. It was found that the combinational circuit is the key to the security of masking schemes. The Toggle Count （TC） method and its extension are utilized to evaluate the security of masking schemes in the design phase and the implementation phase separately. Comparing different logic-level simulators for the Xilinx FPGA platform, the behavioral and post-translate simulations are considered as the analysis method in the design phase, while the post-map and the post-route simulations are used to find the weakness during the implementation phase. Moreover, a Standard Delay Format （SDF） based improvement scheme is proposed to significantly increase the effectiveness of the TC model.

关键词： Side-Channel Attack （SCA） toggle count masking simulation-based analysis

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Galloping Early Warning technology of transmission Lines Based on RBF Neural Network

Galloping Early Warning Technology of Transmission Lines Bas...

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

作者： Li Yang Li Li Jun Guo Xiaowei Huai Xianyong Xu Jihui Xun State Key Laboratory of Transmission and Distribution Equipments Disaster Prevention & Reduction Technology for Power Grid Changsha China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131382

In view of strong nonlinear characteristics of transmission line galloping, firstly, the characteristics of historical dancing are analyzed, and the distribution areas and influencing factors of galloping are also revealed, which can be provided as the theoretical support for the establishment of galloping prediction model. Based on the characteristics of the galloping influence factors, several meteorological factors are selected for the galloping forecast, including surface temperature, rainfall, Upper air temperature, wind speed. Then the galloping forecast model based on Radial Basis Function neural network is built to predict whether galloping is happening. These essential meteorological factors are taken as the input parameters, while the output of the model is the galloping risk result. The galloping samples in the past five years of 2010-2014 has been taken as the training case, and the galloping samples in the November of 2015 in Liaoning Province has been taken as the testing case. The results show that it is feasible to use this artificial forecast model to predict the galloping risk of transmission line. The galloping prediction testing result using the proposed model shows that the forecast precision rate can reach as high as 91%, which can provide great technical support for the anti-galloping work for power grid. The research results can provide support for the transmission line galloping prediction and early warning technology, so as to improve the level of intelligent operation and maintenance of power grid.

关键词： power transmission lines power grids Predictive models Temperature Wind speed Neural networks Conductors

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Research on Long-term Shutdown Reserve Capacity Compensation Considering Profit and Loss Situation of Thermal power Enterprises

Research on Long-term Shutdown Reserve Capacity Compensation...

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第七届工程管理国际学术研讨会

作者： Qian ZHANG Yu LEI Jun LI Quan CHE State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University State Grid Chongqing Electric Power Company

In the context of large-scale losses of thermal power enterprises in recent years, in order to maintain the normal operation of thermal power enterprises to ensure the safe operation of the power grid and reliable power supply, the long-term shutdown reserve capacity compensation mechanism considering the profit and loss situation of thermal power enterprises was studied. Firstly, a long-term reserve capacity quota method considering the actual shutdown of thermal power enterprises is proposed. Then, a reasonable compensation coefficient is set. And according to the effective power generation hours of thermal power enterprises, they will be compensated for different proportions of unit capacity. All compensation amounts will be distributed to all wind, photovoltaic, hydropower generation and outsourcing electricity in the region. Finally, through the analysis of examples, the rationality and effectiveness of the above work are verified, and relevant measures are proposed.

关键词： Thermal power enterprise Standby backup Compensation mechanism Profit and loss situation

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Effect of Flow Channel Cross Section Shape on the Performance of Heat Storage Structure

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Journal of Physics: Conference Series 2021年第1期2021卷

作者： Hui Tan Mengdong Chen Chao Mei Wenzhuo Yao Meixiu Ma Zhanfeng Deng Guizhi Xu Guoliang Zhao Wenliang Liu State Key Laboratory of Advanced Transmission Technology Global Energy Interconnection Research Institute Chang-ping District Beijing 102209 China State Grid Xiamen Power Supply Company Xiamen 361004 Fujian Province China

A numerical simulation is carried out for the thermal storage process in a heat storage device with magnesia bricks as thermal energy storage medium. Three types of cross section shapes (square, hexagon, circle) of the flow channel are considered with the inlet air temperature as high as 1023K. The perssure drop, temperature distribution and temperature uniformity of the flow channel are obtained. The results show that the pressure drop of the flow channel with circle cross section is the lowest when the Reynolds number is less than 2300 (in this case the inlet velocity is 5m/s), While when the Reynolds number is more than 2300, the flow channel with square cross section has the lowest pressure drop. The thermal storage time of the heat storage device decreases with the increase of air velocity. The temperature distribution of the flow channel indicates that the flow channel with hexagon cross section has the best comprehensive performance.

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Distributed transmission technology of node status in distribution network

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Journal of Physics: Conference Series 2021年第1期1920卷

作者： Kuo Tan Hai Wu Guo Hu Hui Chen NARI Technology Co. Ltd. Nanjing 211000 NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing 211000 State Key Laboratory of Smart Grid Protection and Control Nanjing 211000)

With the rapid development of distribution network automation and the construction of DC distribution network and AC / DC hybrid distribution network, the network operation mode is more flexible. If the distribution network wants to realize rapid load transfer, such as the connection of power supply, upstream and downstream fault isolation signals and other node states need to be quickly identified. At present, the node status identification of distribution automation is basically completed by the master station. However, the master station has poor real-time transmission of status information, which is generally in seconds or minutes, and can not meet the demand of real-time load transfer. In this paper, a distributed real-time transmission method of AC and DC distribution network node status is constructed for distribution automation system. Based on IEC61850 goose communication protocol, the real-time transmission of node status is realized in distribution automation terminal. In this method, the positive direction of each tie switch is defined, which is independent of power flow direction, and the tie switch is distinguished along the user-defined positive direction When multiple tie switches have the same upstream node, they are each other's t nodes. Each tie switch needs to be equipped with a distribution automation terminal with goose communication capability. According to different control strategies, the distribution automation terminal can realize millisecond level node state transmission step by step. Node state can be divided into unconditional transmission state and conditional transmission state. The distributed real-time transmission technology of distribution network node state proposed in this paper has been successfully applied to Tongli integrated energy service The center and Suzhou medium and low voltage DC project lay the foundation for the realization of loop closing, loop breaking control, fast fault isolation and power transfer control strat

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Development of Live Working Device Based on Zero Potential Control Principle

Development of Live Working Device Based on Zero Potential C...

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2019第五届电气工程与信息工程国际会议

作者： Xu Li Zhu Ziqi Yang Qi Zhu Liang Li Hui Zeng Wenyuan Gao Quanzhe Ou Yuexiong Zhao Gang State Grid Hunan Transmission and Maintenance Company Hunan Key Laboratory of Intelligent Live Working Technology and Equipment (Robot) Power patrol and intelligent operation technology State Grid Corporation Laboratory State Grid Hunan Electric Power Co. Ltd.

In the case of live working in the distribution network, serious safety accidents will occur due to weak operation and weak safety awareness. The live working methods and equipment that meet the requirements for personal safety and power supply reliability need to be studied. In order to improve the safety of live working in distribution network, the working point zero potential control principle is proposed, and a prototype of the zero potential live operation device for distribution network is developed based on this principle. The principle and design of the charged working equipment based on the principle of zero potential control are introduced. The prototype has the functions of data collection, data analysis, logic protection and information transmission. When the selection and layout of the line conductors are different, the line parameters will also be different. For different conductor selection and layout schemes, three schemes are designed to simulate separately. The system model is established based on MATLAB, and the feasibility of the proposed method is verified by the working phase voltage curve. Experiments and third-party inspections show that the device is reliable in operation, quick in response, easy to operate, and can meet the zero potential control requirements of live working, which is of great significance to improve the safety of live working in distribution network.

关键词： Distribution Network Voltage Control Live Working Operating Device MATLAB

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Containerization of intelligent terminal application in ubiquitous power internet of things 3

Containerization of intelligent terminal application in ubiq...

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3rd IEEE International Conference on Electronic Information technology and Computer Engineering, EITCE 2019

作者： Bin, Niu Zhihua, Bai Dejian, Li Sheng, Liu Lixin, Yang State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing China Beijing Engineering Research Center of High-reliability IC with Power Industrial Grade Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing China

ISBN: (纸本)9781728135847

With the rapid construction of the ubiquitous power internet of things, the increasing demand of embedded hardware usage and the complex usage scenario of the embedded platform hardware in intelligent terminal. A more efficient vitalization solution was demanded. With the analysis of traditional virtualization solutions and the armv8 architecture embedded platform hardware support for virtualization, the implementation details of arm embedded platform supporting containerization technology are described. In particular, the specific steps of application containerization are introduced. In the end, we analyze the performance that application run in container and discuss future research directions. © 2019 IEEE.

关键词： Containers

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power electronic transformer with adaptive PLL technique for voltage-disturbance ride through

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Journal of Modern power Systems and Clean Energy 2018年第5期6卷 1090-1102页

作者： Jianhua WANG Fangfang LUO Qing DUAN Zhendong JI Binshi GU Jun YOU Wei GU Jianfeng ZHAO Jiangsu Provincial Key Laboratory of Smart Grid Technology & Equipment School of Electrical Engineering Southeast University China Electric Power Research Institute Beijing Key Laboratory of Distribution Transformer Energy-Saving Technology Department of Electrical Engineering School of AutomationNanjing University of Science and Technology State Grid Nantong Power Supply Company

The power electronic transformer(PET) has recently emerged as a type of power converter. It features the basic functions of power conversion and isolation as well as additional functions related to power quality control. A novel PET for a distribution grid called a flexible power distribution unit is proposed in this paper, and the energy exchange mechanism between the network and the load is revealed. A 30 kW 600 VAC/220 VAC/110 VDC medium-frequency isolated prototype is developed and demonstrated. This paper also presents key control strategies of the PET for electrical distribution grid applications,especially under grid voltage disturbance ***, stability issues related to the grid-connected three-phase PET are discussed and verified with an impedance-based analysis. The PET prototype is tested, and it passes the voltage-disturbance ride-through function. The experimental results verify the power quality control abilities of the PET.

关键词： power electronic transformer Mediumfrequency isolation Voltage-disturbance ride through power quality Stability

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