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Status evaluation of smart substation measurement and control device

IOP Conference Series: Materials Science and Engineering 2019年第4期563卷

作者： Zhang Min Shen Jian Chen Li Zhou Bin Zhou Shao Liang Hou Zhe NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China NARI Technology Corporation Co. Ltd Nanjing China

In power system, measurement and control device plays an important role in maintaining an ideal level of reliability. Therefore, the reliability of the measurement and control device should be evaluated to fully understand the cause of its failure. A new evaluation model is proposed, which relates the fault of measurement and control system with the four main reasons of device hardware fault, software fault, auxiliary equipment fault and human fault. In addition, the model can also comprehensively consider other aspects of the measurement and control system, such as human error in testing and software upgrade, effectiveness of daily operation monitoring, degree of dependence on self-inspection, local backup and misoperation. These studies have a lot of significance to the reliability of the control system, and also can effectively improve the stability of the system.

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Study on equivalent viscous damping of aeolian vibration for transmission line by AACSR-400 steel core aluminum alloy wire

Study on equivalent viscous damping of aeolian vibration for...

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International Conference on Material Science and Engineering, ICMSE 2016

作者： Zhang, Bo Gong, Wang-Sheng Wang, Ze-Hua Zhang, Meng-Ge Han, Lin Zhang, Yan Electric Power Research Institute Henan Electric Power Company of State Grid Key Laboratory of Power Transmission and Control Technology of State Grid Zhengzhou Henan450052 China Collage of Mechanics and Materials Hohai University Nanjing Jiangsu210098 China

ISBN: (纸本)9783038357667

To ensure its operational security, it is important to study the vibration state of transmission line. The equivalent viscous damping of aero-vibration for a large-span overhead conductor is obligated to be determined. In this paper, the damping characteristics of conductor by AACSR-400 steel core aluminum alloy wire are studied by use of energy balance principle. Based on the Diana wind energy curve and equivalent viscous damping, the relationship between frequency and damping ratio is conducted and discussed. Furthermore, a numerical simulation by ANSYS is performed to verify the validity of the equivalent damping coefficient and equivalent damping ratio with the same material parameters. The study shows that the result of finite element method by ANSYS is consistent well with that by energy balance principle. © 2017 Trans Tech Publications, Switzerland.

关键词： Aluminum alloys

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Research on the Influence of DC Current Overflowing on Grounding Electrode Corrosion 3

Research on the Influence of DC Current Overflowing on Groun...

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2017 IEEE 第3届信息技术与机电一体化工程国际学术会议(ITOEC 2017)

作者： Guohua Liu Ganzhi Jiang Zhanlong Zhang Daojun Mei Yan Zheng Quzhou Power Supply Company of State Grid Zhejiang Electric Power Company State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University) Zhejiang Huadian Wuxi River Hydraulic Power Plant

In the power system,earth electrode is buried in the soil for current overflowing,to ensure secure and stable operation of power grid and electric *** the DC transmission system is in the u

ISBN: (纸本)9781509053643;9781509053636

In the power system,earth electrode is buried in the soil for current overflowing,to ensure secure and stable operation of power grid and electric *** the DC transmission system is in the u

关键词： Electrodes Corrosion Strain Grounding Electric potential Soil Earth

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Decay characters of charges on an insulator surface after different types of discharge

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Plasma Science and technology 2017年第7期19卷 93-101页

作者： Cheng PAN Ju TANG Dibo WANG Yi LUO Ran ZHUO Mingli FU School of Electrical Engineering Wuhan University Wuhan 430072 People＇s Republic of China State Key Laboratory of Power Transmission Equipment ＆ System Security and New Technology Chongqing University Chongqing 400044 People＇s Republic of China Electric Power Research Institute China Southern Power Grid Guangzhou 510080 People＇s Republic of China

In an insulating system including solid and gas dielectrics, discharge type has a strong impact on charge accumulation at the interface between two dielectrics, and hence charge decay. In order to clarify the influence, a surface charge measurement system was constructed, and three types of discharge, i.e. surface discharge, and low intensity and high intensity coronas, were introduced to cause surface charge accumulation. The decay behavior of surface charges after different types of discharge was obtained at various temperatures. It was found that total surface charges monotonically decreased with time, and the decay rate became larger as temperature increased. However, after a surface discharge or a high intensity corona, surface charge density in the local area appeared to fluctuate during the decay process. Compared with this, the fluctuation of surface charge density was not observed after a low intensity corona. The mechanisms of surface charge accumulation and decay were analysed. Moreover, a microscopic physical model involving charge production, accumulation, and decay was proposed so that the experimental results could be explained.

关键词： surface discharge corona surface charge accumulation surface charge decay,insulator

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A design of the common platform of wireless communication based on FPGA

A design of the common platform of wireless communication ba...

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

作者： Qiao, Lei Zheng, Zhe Cui, Wenpeng Zhang, Weilong Jiang, Xueping Research Department of Smart Chip Global Energy Interconnection Research Institute Beijing China State Grid Key Laboratory of Information and Network Security State Grid Laboratory of Electric Power Communication Network Technology Beijing China

ISBN: (纸本)9781538614273

We present a design of the common platform of wireless communication based on FPGA. The platform, developed by us, allows researchers to modify transport protocols on any layer of an OSI reference model, from physical layer to application one, thereby it is feasible to implement multiple wireless communication protocols on different layers. © 2017 IEEE.

关键词： Field programmable gate arrays (FPGA)

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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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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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Modeling and Analysis of AC Side Equivalent Harmonic Impedance of HVDC Converter

Modeling and Analysis of AC Side Equivalent Harmonic Impedan...

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

作者： Xiaohong Geng Jun Wen Sichao Wang Dongshan He Ling Zhang Yongjun Cai Zhongyou Luo Meng Tan School of Electrical and Electronic Engineering North China Electric Power University Beijing China State Grid Xinjiang Electric Power Co. Ltd Urumchi China Xinjiang Zhong Xin Jin Yuan Power Technology Co. Ltd Urumchi China Electric Power Research Institute State Grid Xinjiang Electric Power Co. Ltd Urumchi China State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Beijing China

The AC side equivalent harmonic impedance of HVDC converter is the key to study the harmonic instability and the design of AC filter in HVDC transmission system. Based on the switching function method, this paper deduces a new model of AC equivalent harmonic impedance of converter by analyzing the harmonic transformation mechanism of 12-pulse converter and considering the repeated modulation of AC side harmonic through converter. Finally, using PSCAD/EMTDC electromagnetic simulation software, based on CIGRE HVDC system standard model, the improved time domain simulation calculation is used to verify the proposed method. The comparison between the results of mathematical model calculation and time-domain simulation shows that the new AC equivalent harmonic impedance model in this paper has has high accuracy in the low frequency range.

关键词： Harmonic analysis power harmonic filters Switches Impedance Mathematical model HVDC transmission

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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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Study on HVDC commutation failure and voltage compensated variable slope VDCOL control

Study on HVDC commutation failure and voltage compensated va...

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

作者： Dongshan He Jun Wen Xiaohong Geng Sichao Wang Ling Zhang Yongjun Cai Zhouyou Luo Meng Tan School of Electrical and Electronic Engineering North China Electric Power University Beijing China State Grid Xinjiang Electric Power Co. Ltd. Urumchi China Xinjiang CITIC Jinyuan Power Technology Co. Ltd. Urumchi China State Grid Xinjiang Electric Power Co. Ltd. Electric Power Research Institute Urumchi China State Key Laboratory of Advanced Transmission Technology Global Energy Internet Research Institute Urumchi China

In this paper, through the analysis of HVDC commutation failure mechanism, the influence of commutation voltage reduction on commutation failure is studied. Based on this, a method which can restrain commutation failure and subsequent commutation failure and improve the recovery performance of the system is studied, that is voltage compensation slope VDCOL control strategy. Through modeling and Simulation on CIGRE HVDC benchmark test system, the validity of voltage compensated variable slope VDCOL control strategy is verified. Variable slope VDCOL is beneficial to reduce the probability of HVDC commutation failure.

关键词： Valves Voltage control HVDC transmission Circuit faults Inverters Reactive power

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