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IEEE International Conference on Dielectrics (ICD)

作者： Cong Liu Jian Hao Yanqing Li Ruijin Liao Shengsun Zheng State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China Grid Zhejiang Electric Power Company Hangzhou Power Supply Company Hangzhou China

Space charge accumulation is a major problem in the development of insulating materials. The aim of this work is to suppress charge injection from electrode into cellulose insulating pressboard under DC field by Al 2 O 3 nano-structure layer. The Al 2 O 3 nano-structure layer was deposited by radio frequency (RF) magnetron sputtering under room temperature. Physicochemical and electrical properties of the insulation pressborad modified by sputtering Al 2 O 3 nano-structure layer on its surface was investigated. With reference to the new pressboard sample without prepared, space charge suppression was observed in the pressboard deposited Al 2 O 3 layer. The Al 2 O 3 nano-structure does not decrease the breakdown voltage and thermal property of the sputtered cellulose insulation pressboard. This research provides a new point of view for improving the electrical property of the cellulose insulation materials.

关键词： Aluminum oxide Sputtering Space charge Insulation Surface treatment Surface morphology Scanning electron microscopy

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A Design of Direct Memory Access Controller for Wireless Communication SoC in power grid

A Design of Direct Memory Access Controller for Wireless Com...

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International Conference on Circuits, System and Simulation (ICCSS)

作者： Yingying Chi Zhe Zheng Research Department of Smart Chip Global Energy Interconnection Research Institute Co. Ltd. Beijing China State Grid Key Laboratory of Information & Network Security State Grid Laboratory of Electric Power Communication Network Technology Beijing China

ISBN: (纸本)9781538678206

This paper presents a complete Register Transfer Level (RTL) design of Direct Memory Access (DMA) controller which is compliable with the advanced Highperformance Bus (AHB). The DMA is integrated in Cortex-M3-based system-on-chip (SoC) designed for power-grid-dedicated wireless communication system based on IEEE 802.11ah protocol. The hardware implementation and prototype verification indicate that by allowing hardware devices working at different frequencies to communicate with each other without relying on the heavy outage load of CPU, the proposed DMA controller realizes the good convergence with the whole system and improves the overall performance with low power consumption.

关键词： Registers Hardware Writing Wireless communication Data transfer System-on-chip

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Research on an Intelligent Monitoring Device for Cable Manhole Covers

Research on an Intelligent Monitoring Device for Cable Manho...

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IEEE advanced Information Management,Communicates,Electronic and Automation Control Conference (IMCEC)

作者： Zhang Chongbiao Qin Mingbo Cheng Long Ge Qi Song Jiajia Zhang Jinbo Zhejiang Jiashan County Power Supply Co. Ltd State Grid Jiashan China Jiangsu Key Laboratory of power transmission and distribution equipment technology Hohai University Changzhou China

With the acceleration of the urbanization process, the public sector construction of municipal departments has also developed rapidly. Most of the cables in power and communication departments are buried into the ground. While due to the lack of effective real-time monitoring and management tools for the maintenance of manhole covers, criminals are given the opportunity to steal covers and cables. Once the manhole covers lost, it will bring safety problems to pedestrians and vehicles, thus this paper proposed an intelligent monitoring device for cable manhole covers. The device uses six axis sensors to monitor the attitude of the cable well covers. Once the attitude changes, it is sent to the supervisors' mobile phones through wireless network. The actual use verifies that the monitoring device has advantages of easy installation and simple maintenance, and it can timely monitor whether the cable manhole cover is moved artificially, which is of great significance to improve the safety of road driving.

关键词： Encoding power cables Monitoring Maintenance engineering GSM Communication cables Real-time systems

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Research and Application of Trans-Regional Cooperative Disposal of UHV Interconnected power grid 3

Research and Application of Trans-Regional Cooperative Dispo...

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2017 3rd IEEE International Conference on Control Science and Systems Engineering (ICCSSE)

作者： Shan Xin Jiang Yefeng Wu Li Jin Yiding Wang Yiyu Lu Jinjun NARI Group Corporation NARI Technology Co.Ltd State Key Laboratory of Smart Gird Protection and Control Jiangsu Electric Power Company of State Grid of China National Electric Power Dispatching and Control Center State Grid Corporation of China

ISBN: (纸本)9781538604854

With the rapid construction of UHV AC/DC power grid, the integration characteristics of power grid are becoming more and more prominent, and real-time operation control of dispatching is significantly becoming more and more difficult. The existing monitoring and control model based on the system model data cannot meet the requirements for the development of UHV power grid. Based on the existing achievements of dispatching automation system, the general goal and framework of the trans-regional cooperative disposal of UHV interconnected power grid are put forward, and the key technologies are analyzed in four aspects: situation awareness, fault location, joint disposal and cooperative control to provide reference and example for follow-up construction for real-time control and support system for the dispatching of UHV power grid.

关键词： UHV situation awareness cooperative disposal source grid load wide area graphic browsing DC fault diagnosis

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Research on the Method to Measuring Tower Grounding Resistance by Distributing Multi Electrodes around Local Area

Research on the Method to Measuring Tower Grounding Resistan...

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作者： Honghe HUANG Pinggang DING Guohua LIU Lan YI Chengfeng GAO Lijun HU Zhanlong ZHANG Quzhou Power Supply Company State Grid Zhejiang Electric Power Co.Ltd Quzhou Bright Power engineering Co.Ltd. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University

The traditional methods of measuring grounding resistance need larger current lead length and long electrodes distribution distance,which brings difficulties to the measurement of tower grounding resistance in mountainous area and dense urban *** long electrode distribution distance also consumes more manpower and material resources,and increases the economic cost of grounding resistance *** order to reduce the workload of the staff,a new method of measuring tower grounding resistance is needed,which can measure the tower grounding resistance in real-time and short *** on the distribution characteristics of discharge current inside and outside the tower foundation,a new method for measuring tower grounding resistance in local area of the tower foundation is proposed in this *** method reflects the actual discharge current to the greatest extent during the measurement process,thus reducing the influence of current distortion in the measurement and improving the accuracy of tower grounding resistance measurement under the condition of distributing electrodes in short distance.

关键词： Research on the Method to Measuring Tower Grounding Resistance by Distributing Multi Electrodes around Local Area

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The Optimization Design of Micro-Strip UHF Sensor and the Applied Research of GIS PD Detection

The Optimization Design of Micro-Strip UHF Sensor and the Ap...

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IEEE International Conference on Mechatronics and Automation

作者： Jie Li Jiabao Li Yingfen Wang Shizhen Li Yanhang Zhao Honghe Power Supply Bureau of Yunnan Power Grid Co. Ltd. Mengzi China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China

UHF technology is an important method in Gas Insulated Switchgear (GIS) Partial Discharge (PD) detection, which is applied on large scale both at home and abroad. UHF sensor is the key part of UHF PD detection system, whose quality directly decides the performance of the detection system. This paper will employ micro-strip theory to make a targeted design of UHF sensors according to the traits of GIS PD. The author will start from the design of rectangular patch micro-strip sensor, and make a modeling analysis of its operating characteristics, then introduce fractal theory on that basis to design a fractal micro-strip sensor suitable for GIS PD detection and conduct simulated analysis on the proposed model. The last step is to develop the material object of the sensor, then put it to detection test on the simulation test platform to verify its detectability and performance. The experimental results show that the fractal micro-strip sensor has wide detection signal band and high sensitivity. It can detect the PD signal precisely, providing a new design idea for GIS PD detection sensors.

关键词： UHF sensor GIS PD detection Micro-strip theory Fractal micro-strip sensor

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A Self-powered Wireless Inrush Current Measurement System

A Self-powered Wireless Inrush Current Measurement System

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Conference on Diagnostics in Electrical Engineering (Diagnostika)

作者： Xianwu Zeng Shengfu Li Disheng Wang Zunyi Power Supply Bureau Guizhou Power Grid Co. Ltd. Zunyi Guizhou State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781538644256

A self-powered inrush current measurement system based on the electromagnetic induction principle is proposed. Signal coil and power harvesting coil adopt Rogowski coils, which are nested in the current channel. power supply unit draw out energy from inrush current. After signal conditioning, polarity, peak value and occurrence time of transient surge current can be acquired. The current information can be power-down stored, and wireless data transmission is achieved through ZigBee protocol. Experiments prove that the system can be self-powered by inrush current and realize linear measurement within the range of 10kA to 200kA.

关键词： Current measurement Surges power supplies Surge protection Wireless communication ZigBee Data communication

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Research on operation control strategy of user-side power routing device in market environment

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IOP Conference Series: Earth and Environmental Science 2020年第1期467卷

作者： Xue Jin Kun Huang Xiaoyan Zhang Xin Meng Dan Wang NARI Technology Development Co. Ltd. No.19 Chengxin Avenue Jiangning District Nanjing City Jiangsu Province China Nari Group Corporation/State Grid Electric Power Research Institute No.19 Chengxin Avenue Jiangning District Nanjing City Jiangsu Province China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China

Considering the demand of distributed power trading, a user-side power routing device topology is designed. The operation scenario of the device is divided into eight operation states, and the operation control strategy of the device system oriented to power trading is proposed for the eight operation states. In the process of power trading, grid-connected converters adopt Direct power Control (DPC) to realize constant power trading. Super Capacitor (SC) adopt constant voltage control, Lithium battery adopt droop control, the Super Capacitor and the Lithium battery work together as the system bus voltage control unit. A simulation model is built on PSCAD/EMTDC platform, and two typical scenarios of power trading mode and non-trading mode are compared and analyzed. The simulation results verify the effectiveness of the proposed strategy.

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The analysis of distance protection operation characteristics of power system based on VSC-HVDC interconnection

The analysis of distance protection operation characteristic...

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2017 IEEE Conference on Energy Internet and Energy System Integration, EI2 2017

作者： Tang, Maolin Xiao, Chao Ouyang, Jinxin Yu, Rui Zhang, Xi Xiong, Xiaofu Luo, Yongjie State Grid Southwest Division Chengdu China State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781538614273

As the VSC-HVDC system has attractive advantages of high stability and controllability, it becomes a key development direction of the HVDC. Dynamic operation and controllability features of VSC-HVDC system differ a lot from that of conventional AC and DC transmission. During the grid fault, the VSC-HVDC export various short circuit current to AC system which can be a threat to the correct operation of distance protection. Based on the control principle of VSC-HVDC converter station, the voltage and phase features of the VSC-HVDC short-circuit current is analyzed. The measured impedance variation of the VSC-HVDC distance protection in AC side is also analyzed. The influence and interrelated factors of VSC-HVDC to distance protection are proposed. Digital simulation on PSCAD/EMTDC is done to verify the validity of the analysis. © 2017 IEEE.

关键词： HVDC power transmission

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Design and Implementation of a Modular Multilevel Converter with Hierarchical Redundancy Ability for Electric Ship MVDC System

Design and Implementation of a Modular Multilevel Converter ...

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作者： Chen, Yu Li, Zuoyu Zhao, Shanshan Wei, Xiaoguang Kang, Yong State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Grid Smart Grid Research Institute Beijing102200 China

Modular multilevel converter (MMC) can be considered as a promising candidate for modern electric ship medium-voltage direct current (MVDC) power system due to its high-voltage quality, low switching loss, good expansibility, and good redundancy. As the voltage level in MVDC is much lower than that in high-voltage direct current case, the number of submodules (SMs) of MMC in MVDC system is also much less. Therefore, the SM failure will have more significant effect on the safety operation. Since uninterrupted operation is one of the most important requirements in electric ship application, the special redundancy design for MMC is required. This paper thus proposes an MMC system with hierarchical redundancy ability, aiming to guarantee the ride-through operation under SM failure. The 'hot-reserved' and 'cold-reserved' SMs are prepared in the MMC by compromising the faulty SM number, voltage and current stress of SMs, SM power loss, and so on, and the hierarchical redundancy strategy is divided into several progressive layers to ride through the SM failure in different cases. The pretreatment units are designed to realize the proposed hierarchical redundant strategy smoothly, and without changing the existent modulation and sort-and-selection strategies designed for normal condition. The proposed design is explained in this paper, and verified by a three-phase MMC simulation and a single-phase MMC prototype. © 2013 IEEE.

关键词： Redundancy

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