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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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Fast Fault Detection and Current Limiting Strategy of HVdc Circuit Breaker 5

Fast Fault Detection and Current Limiting Strategy of HVDC C...

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2018 5th International Conference on Advanced Composite Materials and Manufacturing Engineering, ACMME 2018

作者： Li, Wei Wu, Xueguang Liu, Dong Chang, Bin Zou, Le School of Electronic Engineering North China Electric Power University Changping District Beijing102206 China State Key Lab of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co. Ltd. Changping District Beijing102209 China Beijing Key Laboratory of DC Grid Technology and Simulation Global Energy Interconnection Research Institute Co. Ltd. Changping District Beijing102209 China Global Energy Interconnection Research Institute Co. Ltd. Changping District Beijing102209 China

HVdc transmission has become the most valuable engineering technology because of its own advantages. But the rapid detection and isolation of dc side faults has been one of the major technical matters in the development of dc grids. Highvoltage dc circuit breaker is an important equipment to solve this problem, and becomes the current research hotspot. According to the process of HVdc breaker, this paper analyzes the fault detection and current limiting control of HVdc breakers, and proposes a fault detection method based on ROCOV (Rate Of Change Of Voltage) and a current limiting strategy of operation of arresters by sequence. It can reduce the operation time of the circuit breaker and the peak value of the fault current. Finally, simulation analysis is performed on the PSCAD/EMTdc to verify the correctness of the method. © Published under licence by IOP Publishing Ltd.

关键词： Fault detection

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Electromechanical modelling of modular multilevel converter based HVdc system and its application

Electromechanical modelling of modular multilevel converter ...

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

作者： Kou, Longze Zhu, Lin Li, Fangyuan State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation Global Energy Interconnection Research Institute Beijing China

ISBN: (纸本)9781538614273

This paper introduces the electromechanical modelling method of modular multilevel converter based high voltage direct current (MMC-HVdc) system and studies the Chongqing-Hubei project based on the model. Firstly, the steady load flow model is established in this paper. Then, the transient stability model, which includes the AC side model, dc side model and control system model, is described in detail. For improving the transient stability, an additional control method, which combines a frequency controller and emergency power support strategy, is added on the control system model. Moreover, the modulation model is studied and discussed in case of fault conditions. The model is implemented on PSASP and its validity is verified through comparison with electromagnetic model. At last, the simulation is carried out based on the real grid date. The simulation results demonstrate the benefits of MMC-HVdc and the improvement in transient stability by applying the additional control method. © 2017 IEEE.

关键词： Electric load flow

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A design method of MMC-HVdc physical simulation system

A design method of MMC-HVDC physical simulation system

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

作者： Dong, Liu Lu, Gao Longze, Kou State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation Global Energy Interconnection Research Institute Beijing China

ISBN: (纸本)9781538614273

For the growing power rating and voltage level, modular multilevel converter (MMC) is a feasible solution in the application of voltage sourced converter based high voltage direct current(VSC-HVdc) transmission. However, due to its numerous independently controlled sub-modules(SMs), it is very difficult to represent the complete internal transient process of MMC or accomplish the hardware-in-loop (HIL) test of valve based controller (VBC) using digital simulation platform. Therefore, this paper deduces the similarity criterions and the parameter calculation method for the design of low-voltage physical simulation system. Taking the Xiamen ± 3 20kV/1000MW MMC-HVdc project in China as a simulation prototype, a physical simulation system is built, based on which the type test of VBC and system operation analysis are completed. Experiment results verify the correctness of the proposed calculation method and the designed system. © 2017 IEEE.

关键词： simulation platform

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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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The mechanical simulation of a special biosensor

The mechanical simulation of a special biosensor

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第十九届国际电子封装技术会议(ICEPT 2018)

作者： Haifeng Zhang Dongyan Zhao Yanning Chen Wenhe Wang Yidong Yuan Shuaipeng Wang Jianqiang Li Yubo Wang Xinghui Zhang Hongxun Tian State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Department of safety supervision and quality State Grid Corporation of China

Cantilever-based sensor is kind of the most popular MEMS *** this paper,by taking an example the process of analyzing a transducer is explained,such as building models and performing mathematic operations on result data to get the performance parameters of a cantilever-based *** also state the principle of the cantilever *** the meantime we explain the theory of the operating of cantilever,and a cantilever sensor design guided by mechanical simulation.

关键词： cantilever MEMS ANSYS biosensor simulation

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A Synchronization Algorithm for Burst-Mode MR-OFDM System of 802.15.4g

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Journal of Physics: Conference Series 2019年第1期1325卷

作者： Yahong Zhao Xu Zhao Yubing Zhang Xiaoke Tang Mingke Dong State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Design and Analysis Technology Co. Ltd Beijing Beijing 100192 China School of Electronics Engineering and Computer Science Peking University Beijing Beijing 100871 China

This paper presents a refined coarse frame synchronization algorithm for long repeated-sequence based preamble STF (short training field) in burst mode MR-OFDM system of 802.15.4g which is of low decision delay and resistant to timing uncertainty due to metric plateau. The precision of coarse timing and frequency offset estimation is improved. A fine symbol timing and frequency offset estimation algorithm based on LTF (long training field) is also proposed which provides an overall solution for the synchronization of burst mode MR-OFDM system. simulation results are given to provide reference for implementation.

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Electric vehicle smart charging network under the energy internet framework

Electric vehicle smart charging network under the energy int...

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

作者： Kai Yuan Chongbo Sun Yi Song Zhenyu Xue Zhili Wu Shuang Gao Jing Xu State Grid Economic and Technological Research Institute Co. Ltd. Beijing China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Economic and Technology Research Institute of State Grid Tianjin Electric Power Company Tianjin China

ISBN: (纸本)9781538614280

The development of energy internet facilitates the precious intelligent control of EV smart charging network, and therefore bringing economic benefits to the power grid and the customers. The strategies for integrating network of charging service into the energy internet and the construction strategy of EV smart charging network are proposed. The technologies and hardware is presented to form the construction principles in typical charging scenarios. And then the business model is established on the condition of technology development and existing hardware platform, aiming to improve promote the smart energy utilization and the application of energy internet.

关键词： Internet Information and communication technology Planning simulation

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An engineering applicable dynamic equivalent method for large-scale AC system connected to VSC-HVdc

An engineering applicable dynamic equivalent method for larg...

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2016 IEEE PES Asia Pacific Power and Energy Engineering Conference, APPEEC 2016

作者： Lin, Zhu Xueguang, Wu Liu, Dong Global Energy Interconnection Research Institute Beijing China State Key Laboratory of Advanced Power Transmission Technology Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation Beijing China

ISBN: (纸本)9781509054183

To test the software and hardware functions of VSC-HVdc control and protection device, an efficient way is to carry out the hardware-in-loop (HIL) tests and setup a detailed AC/dc transient model in real-time digital simulator. However, taking into account capability of the simulator and details of the simulation, the large scale AC network outside the converters should be simplified and equivalent. In this paper, based on a principle that the short circuit levels should be consistent before and after equivalent, a new equivalent method to calculate the equivalent generator parameters for large scale AC power system is proposed. Firstly, rated capacity and access reactance of equivalent generators are calculated according to equivalent bus's short-current. Secondly, a new criterion is provided based on short-current contribution ratio, according to short-current and short-reactance of the equivalent bus. Finally, this criterion is used to choose dominate controller of the equivalent generators, and calculate controller parameters. At the same time, the Ward method is improved. The negative line resistance and generator active output are corrected. Finally, the proposed method is used for Xiamen equivalent grid which derived from a large scale of 'Sanhua' China power grids and validated by comparison of the bus voltages, power flows, short-circuit levels and the dynamic response characteristics of the equivalent network, the validity of the proposed method is proved. © 2016 IEEE.

关键词： Timing circuits

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Highway Charging Station Plan Based on Dynamic Traffic Flow simulation

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IOP Conference Series: Earth and Environmental Science 2018年第3期170卷

作者： Jing Zhang Hao Zhou Shaohua Liu Chang Liu Shuang Zeng Linru Jiang Bin Li Hong Liu Beijing Electric Vehicle Charging Engineering &Technology Research Center China Electric Power Research Institute Co Ltd Beijing China Smart Grid Education Key Laboratory (Tianjin University) Tianjin China Anhui Electric Power Saving Service Co Ltd State Grid Corporation of China Hefei China Beijing Electric Power Company State Grid Corporation of China Beijing China

The reasonable arrangement of the charging station, the infrastructure used to charge the electric vehicle, is vital for the promotion of electric vehicles. As for highways, a highway charging station planning method based on the dynamic traffic flow simulation is proposed in this paper. First, the running and charging demands of electric vehicles on the highways are analyzed; second, considering the interests of investors and vehicle owners, a mathematical model is constructed to specify the objective function; thirdly, the dynamic traffic flow simulation method suitable for the highway condition is proposed; finally, a method is provided, the validity and practicability of this method are verified with examples, and its effects on the photovoltaic consumption are analyzed further in this paper as for the planning result.

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