检索结果-内蒙古大学图书馆

IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)

作者： Chunyan An Di Zhai Cheng Zhong Linlin Zhang Sujie Shao State Grid Smart Grid Research Institute Co. Ltd Beijing China State Grid Xiong’an New Area Electric Power Supply Company Hebei China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China

With the development of urban electric Internet of things, there are a large number of access services in the local access side communication network of electric Internet of things. Designing a security isolation scheme for communication services on the power access side can provide a certain guarantee for the communication security of the power grid. This paper proposes a secure isolation technology for access side communication services based on WLAN (Wireless Local Area Network) network slicing. A network slicing controller is designed to allocate time-frequency resources to power grid communication services to construct network slices, so as to realize the logical isolation between communication services. An Actor-Critic algorithm based 802.11ax network slice resource scheduling method is designed to make full use of the slice resources. simulation results show that the network slice construction method can ensure the access side communication service logic isolation and make full use of communication resources.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A Novel Hybrid Routing Algorithm for In-Network Compressive Sensing in Wireless Sensor Networks

A Novel Hybrid Routing Algorithm for In-Network Compressive ...

引用

International Conference on Internet of Things, Communication and Intelligent technology, IoTCIT 2022

作者： Jia, Qiang Zhang, Yiyi Guo, Peng Zhang, Kui Liu, Jiang State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing China Huazhong University of Science and Technology Wuhan430074 China Pentair Group Marssteden Netherlands Shenzhen Miaoyan Technology Co. Ltd. Shenzhen China

ISBN: (纸本)9789819904150

Energy-efficient data gathering in Wireless Sensor Networks (WSNs) has been widely studied, and compressive sensing (CS) is an effective solution. CS can guarantee the sink node to accurately obtain all sensor nodes’ raw data with low data gathering cost, which is unlike the data aggregation solutions that usually result in large information loss. The existing compressive sensing methods used in WSN, either all nodes participate in compressive sensing computation which means all nodes need to delivery cumulative projection results with a size several times of raw data, or assume that the communication capability of nodes is heterogeneous (some nodes have the communication capability of one hop to sink). This paper aims at general WSN consisting of sensor nodes with isomorphic communication capability, effectively designs a new hybrid routing algorithm for two categories of nodes (i.e., perform compressive sensing calculation or not). This algorithm reduces part of sensor nodes’ transmission cost when applying compressive sensing, while remaining the quality of reconstructed data. Extensive number of simulation experiments have been done, and the results verify the advantages of this method over the existing methods. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Compressed sensing

来源：评论

学校读者我要写书评

暂无评论

Topology Study of Advanced Co-Phase Traction Power Supply System Based on Multilevel Three-Phase to Single-Phase Converter

Topology Study of Advanced Co-Phase Traction Power Supply Sy...

引用

Asia Conference on Energy and Environment Engineering (ACEEE)

作者： Bin Chen Xiong Du Hongjun Yang Yuelong Cao Chengmao Du Heng Wang State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China Smart Grid Research Institute State Grid Corporation of China Beijing China

The single phase power frequency traction power supply system is widely used in electrified railways of China, which inevitably brings negative sequence problem, and slope stop accidents may occur when trains pass through the phase separation area due to the existence of electric phase separation. The Advanced co-phase traction power supply system based on multilevel three-phase to single-phase converter can effectively solve the above problems through three-phase-single-phase symmetrical transformation. Firstly, the existing multilevel three-phase to single phase converters for advanced co-phase traction power supply system are analyzed in terms of topology and operating characteristics, and concludes that the three-phase to single-phase converter based on the modular multilevel converter (MMC) structure has significant advantages, which is verified by simulation in PSCAD. Finally, under the background of high proportion of new energy sources connected to the power grid, a new energy hybrid multi-terminal advanced co-phase traction power supply system based on MMC is proposed. The research in this paper can provide reference for the development of advanced traction power supply system.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A review of PETT oscillation's characteristics, mechanism, and suppression methods in the IGBT device

引用

Power Electronic Devices and Components 2023年 4卷

作者： Feng, Ganyu Li, Xuebao Tang, Xinling Wei, Xiaoguang Zhao, Zhibin State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China

In practical application, there are many parallel insulated gate bipolar transistor (IGBT) chips and anti-parallel fast recovery diode (FRD) chips in the IGBT devices. Because of the interactions between parasitic inductance and chip capacitance, plasma extraction transit time (PETT) oscillation might raise during the operation of IGBT device. The PETT oscillation, whose frequency ranges from 1 MHz to 700 MHz, may induce interference on driver circuits, and then cause the device failure. Moreover, the electromagnetic disturbance will affect the secondary devices. Therefore, it should be seriously considered in the design of the packaging to suppress PETT oscillation. The mechanism of PETT oscillation is complex, and its electrical characteristics are sensitive to the chip's parameters, load current, and dc link voltage. Hence, PETT oscillation is an important problem to be solved in device packaging design. In this paper, the characteristics, mechanism, and suppression methods of PETT oscillation are summarized. Based on the systematic summary, various suppression methods are compared and analyzed. Furthermore, the future research issues are prospected. © 2022 The Author(s)

关键词： Capacitance

来源：评论

学校读者我要写书评

暂无评论

dc-link Oscillation Suppression For DAB-based Photovoltaic- Energy Storage Power Generation System

DC-link Oscillation Suppression For DAB-based Photovoltaic- ...

引用

China International Conference on Electricity Distribution, CICED

作者： Zimo Wang Wenwei Jiang Yunfei Xu Htun ko ko latt Pengwei Chen State Key Laboratory of Advanced Power Transmission Technology (State Grid Smart Grid Research Institute Co. Ltd.) Beijing China College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing Jiangsu Province China

ISBN: (数字)9798350368345

ISBN: (纸本)9798350368352

For the photovoltaic (PV)-energy storage system, the dc-link oscillation is usually generated due to the interactions between converters. This paper takes the dual-active bridge (DAB) converter integrating energy storage as the research object of the suppression. Based on the small-signal model of DAB converter, an active damping using capacitance voltage feedforward is proposed to simulate resistor and capacitor respectively on demand, thus reshaping the input impedance of the DAB converter. Finally, the strategy is validated by impedance modeling and the electromagnetic transient simulation.

关键词： Damping Photovoltaic systems Resistors Bridge circuits Voltage Frequency conversion Impedance Feedforward systems Oscillators Energy storage

来源：评论

学校读者我要写书评

暂无评论

Effective Neumann Boundary Condition for Boundary Layer at Ohmic Contact

Effective Neumann Boundary Condition for Boundary Layer at O...

引用

International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Nian-En Zhang Yin-Da Wang Bo-Ming Chi Wen-Yan Yin College of ISEE Zhejiang University Hangzhou China State Grid Key Laboratory Beijing Smart-Chip Microelectronics Technology Beijing China

The ohmic contacts in semiconductor simulation lead to thin boundary layers with sharp peaks in simulations. It stems from singular logarithmic quasi-Fermi potential function. This paper proposes an effective Neumann condition. Such a boundary condition reduces computational cost and retains rather high accuracy simultaneously. This method is tested with a PN junction and validated by the accuracy of terminal current.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Operating characteristics and artificial short circuit test of cascaded full bridge hybrid dc circuit breaker

Operating characteristics and artificial short circuit test ...

引用

Annual Meeting of CSEE Study Committee of HVdc and Power Electronics (HVdc 2023)

作者： B. Yang L. Zheng D. Xu W. Wu H. Ma H. Wang State Key Laboratory of Advanced Power Transmission Technology (State Grid Smart Grid Research Institute CO.LTD) Beijing 102209 People's Republic of China Beijing Key Laboratory of High -power Electronics (State Grid Smart Grid Research Institute CO.LTD) Beijing 102209 People's Republic of China Electric Power Research Institute of State Grid Jibei Electric Power CO.LTD Beijing 100054 People's Republic of China

As the first high-voltage dc circuit breaker topology to achieve engineering application, the cascaded full bridge hybrid dc circuit breaker has successfully cleared dc pole grounding faults in Zhoushan Five-terminal VSC-HVdc Transmission Project several times after being put into operation. The operation principle of the cascaded full bridge hybrid dc circuit breaker is analysed in this paper, a detailed analysis of the commutation process of the full bridge submodule during the circuit breaker breaking process is provided. The impact of stray inductance on the sub-module breaking process was analysed through test data. The branch commutation process of the cascaded full bridge dc circuit breaker is analysed during the breaking process. Finally, the artificial short circuit test result of cascaded full bridge high-voltage dc circuit breakers in the Zhoushan Five-terminal VSC-HVdc Transmission Project was analysed.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Research on Hpfc-Based Hybrid Series Complementary Device and Sub-Synchronous Oscillation Suppression Strategy

SSRN

引用

SSRN 2024年

作者： Yang, Yongchun Du, Xiangyu Chen, Xuntong Yang, Peng Yu, Hongyang Zhao, Chengyong Hebei Key Laboratory of Distributed Energy Storage and Microgrid North China Electric Power University Baoding071003 China State Grid Hebei Electric Power Co. Ltd Shijiazhuang050081 China State Key Laboratory of Advanced Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing102200 China

In order to address the risk of sub-synchronous oscillation (SSO) in large-scale wind power transmission through series compensation lines, the paper combines a large-capacity phase shifter (PST) with a small-capacity cascaded H-bridge converter (CHBC) into a hybrid flow controller (HPFC), which realizes the precise control of line voltage to change the equivalent reactance of the series in the line and combines with a fixed series compensator (FSC) to flexibly change the degree of line series compensation. The paper firstly models the HPFC equivalently and solves its internal impedance equivalent expression to derive the functional relationship between the port equivalent reactance of the HPFC and the voltage of the PST gear and CHBC ports, so as to realize the precise and flexible adjustment of the line string complement;secondly, it analyzes the impedance characteristics of the PST in the sub-synchronous frequency band, and proves that the PST can improve the positive impedance in the sub-synchronous frequency band of the system while providing the line string complement effectively. Secondly, the impedance characteristics of PST in the subsynchronous band are analyzed, which proves that PST can effectively improve the positive damping in the subsynchronous band while providing the line string complement;again, by using the flexible controllability of CHBC, the additional subsynchronous damping control strategy (ASSdc) is designed, which can inhibit the SSO by extracting the subsynchronous component of the line and increasing the equivalent damping of the subsynchronous band of the system by using CHBC;finally, the turbine is constructed through the HPFC grid-connecting model in the PSCAD/EMTdc, and the simulation analysis shows that HPFC can flexibly and precisely change the line series supplement under different working conditions, which verifies the effectiveness of the proposed control strategy. © 2024, The Authors. All rights reserved.

关键词： Bridge circuits

来源：评论

学校读者我要写书评

暂无评论

Mechanism Analysis of Fault Interaction Effects Between the Positive and Negative Poles in Bipolar MMC-HVdc Systems

Mechanism Analysis of Fault Interaction Effects Between the ...

引用

IEEE International Conference on Power and Energy Applications (ICPEA)

作者： Xiao Zhou Yuexi Yang Zhenyu Du Tongyue Sun Yu Bai Zhenhua Lv State Key Laboratory of Advanced Power Transmission Technology (State Grid Smart Grid Research Institute Co. Ltd) Beijing China State Grid Jiangsu Electric Power Co. Ltd. Research Institute Nanjing China

Modular multilevel converter (MMC) based high-voltage direct current (HVdc) is an effective solution for achieving large-scale coordination, complementarity, and reliable transmission of renewable energy, and is an important application direction for future high-voltage and large-capacity dc transmission. However, at the dc side of the bipolar VSC-HVdc system, if the pole-to-ground fault occurs in one pole, it will not only lead to the rapid rise of fault current that may damage the power electronic devices, but also affect the operation of the other pole. Therefore, it is of great importance to investigate the characteristics of the pole-to-ground fault at dc side and the mechanism of fault interaction effects between two poles. In this paper, the operation principle of the MMC and the bipolar VSCHVdc system are introduced firstly. Then, the characteristics of the pole-to-ground fault are analysed and the interaction effects is studied. Finally, the fault characteristics and mechanism of interaction effects are verified by electromagnetic transient (EMT) simulations.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Fault Ride-through Control of Improved Voltage Drop Method for MMC-HVdc Connected Renewable Energy 12

Fault Ride-through Control of Improved Voltage Drop Method f...

引用

12th International Conference on Renewable Power Generation, RPG 2023

作者： Zhang, Li Li, Shengnan Xu, Shoudong Li, Yong Chen, Qinlei Dong, Xuezheng Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming China Kunming Power Supply Bureau Kunming China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of Alternative Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China

Renewable energy connected to the grid via MMC-HVdc should have fault ride-through (FRT) ability. However, it is difficult to achieve reliable FRT without high-speed and reliable communication between converters in the system. The coefficient of the traditional voltage drop method is qualitatively set as a linear constant, making it difficult to quickly reach the required voltage under different faults. As a result, there are long step delays due to the coordination of converters in the system, which consequently causes the dc system to operate at high voltage during FRT. To address this problem, this paper analyzes the dynamic characteristics of the dc system and the principles of the traditional voltage drop method. Based on this analysis, FRT control of improved voltage drop method for MMC-HVdc connected renewable energy is proposed. Finally, a simulation model is constructed in the PSCAD/EMTdc simulation platform to verify the effectiveness of the proposed method. Additionally, the proposed method is compared with the traditional method. The results demonstrate that the proposed method reduces the step delay and achieves accurate and reliable FRT. © The Institution of Engineering & technology 2023.

关键词： HVdc power transmission

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：