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检索条件"机构=State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid"

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Numerical calculation of electric field safety area of 10 kV transformer based on Maxwell

Numerical calculation of electric field safety area of 10 kV...

引用

2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Chen, Hao Gao, Ya Zhu, Xiaosong Electric Power Research Institute of Guangdong Power Grid Co. Ltd. Guangzhou51008 China China Southern Power Grid Key Laboratory of Power Grid Automation Laboratory Guangzhou51008 China State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing400030 China

ISBN: (纸本)9781728135205

There is alternating electromagnetic field around 10 kV transformer when it is live. When the worker enters the electric field during live maintenance, the distribution of electric field will change unevenly. When the electric field of human body reaches a certain intensity, it will bring personal injury to the worker. In order to avoid this situation, the finite element method is used to establish the transformer and human body model for numerical calculation of the working area. The distribution of electromagnetic field around the transformer and the change of electromagnetic field after joining the human body model are obtained. The safe distance is obtained by measuring the distance, so as to determine whether the corresponding protection needs to be taken. Protection measures. This paper provides technical and theoretical basis for the safe operation of live working of 10 kV high voltage transformer. © 2019 IEEE.

关键词： Electric fields

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A Security Evaluation of Distribution Networks CPS Considering Information- Physical Combinations Anticipated Failure Screening

A Security Evaluation of Distribution Networks CPS Consideri...

引用

IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Ming Ni Manli Li Xia Zhou Zhou Yang NARI Group Corporation (State Grid Electric Power Research Institute) NARI Technology Co. Ltd. State Key Laboratory of Smart Grid Protection and Control Nanjing China Institute of Advanced Technology Nanjing University of Posts and Telecommunication Nanjing China

ISBN: (数字)9781728167824

ISBN: (纸本)9781728167831

With the rapid development of ICT technology and automation control technology, the distribution network has gradually transformed into a distribution network information physical system (distribution network CPS) with highly coupled information systems and physical systems. The information system supports the stable operation of the physical system, and it also brings certain security risks to the distribution network CPS. Therefore, information impact should be considered in the original single physical anticipated fault assessment. This paper proposes a security analysis and evaluation method for distribution network CPS considering information-physical combination anticipated fault screening. Firstly, based on the CPS structure of the distribution network, a CPS correlation matrix model of the distribution network that can reflect the power-information coupling characteristics is established. Then analyze the correlation between information failure and physical failure, and construct an initial information-physical combination anticipated fault set according to topology correlation and service correlation. Then, based on the fault recovery rate ordering, the key information- physical combination anticipated fault is selected. Finally, for the selected combination of anticipated failures, the security assessment of the distribution network CPS security assessment indicators is carried out, and verified in the example.

关键词： distribution network CPS association matrix anticipated failure information-physical combination power grids Computer based information systems physical fault set faults stability operations

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Research on Characteristics of Funnel Tube Four-electrode Jet Generator and Its Plasma Jet-flow

Research on Characteristics of Funnel Tube Four-electrode Je...

引用

International Conference on High Voltage Engineering and Application, ICHVE

作者： Xiong Liu Qian Wang Siquan Li Siqi Wang Hua Yin Mao Zhou Mengge Zhou State Grid Chongqing Electric Power Company Chongqing Electric Power Research Institute organization Chongqing China State Key Laboratory of Power Transmission Equipment & System Security and New Technology (Chongqing University) Chongqing China State Grid Chongqing Electric Power Company Chongqing China

ISBN: (数字)9781728155111

ISBN: (纸本)9781728155128

In order to improve the characteristics of traditional atmospheric pressure plasma jet generator based on dielectric barrier discharge, a funnel tube four-electrode plasma jet generator that contains funnel quartz glass tube and four-ring electrode structure is designed in this paper. When the argon and carbon tetra fluoride mixed in a certain proportion is introduced into the narrow bore side of funnel tube as the operating gas and AC voltage is exerted, plasma jet flow will generate in the wide bore side and the spectrum test shows that there are a number of fluorine elements with strong activity in the jet flow. Firstly, the test results show that the contact angle of water on the surface of glass treated by jet flow can reach 137.5° while the SEM analysis indicates that the obvious micro Nano structure formed on the material surface can reach 68μm in thickness. The Maxwell simulation analysis results of internal electric field structure of jet generator show that there are three uniformly-distributed and symmetrical strong electric fields inside the jet tube, which can enhance the ionization of operating gas and improve the stability of dielectric barrier discharge. Secondly, the results of calculating the changes of flow velocity and Re of operating gas inside the tube show that the operating gas flows more stable inside the tube and maintains in the laminar flow regime. Finally, the particle collision and ionization physical reaction process taking place in the three areas in the jet tube is analyzed and the reasons why there are more active particles in the jet flow and the processing effects are good are illustrated. The results indicate that there are relatively greater improvements of funnel tube four-electrode jet generator mentioned in this paper in discharge process stability, excitation degree of operating gas, surface processing effects and other aspects.

关键词： Electrodes Surface treatment Electron tubes Generators Plasma jets Glass Electric fields

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High frequency development and discharge characteristics of SiO2 modified polyimide films

High frequency development and discharge characteristics of ...

引用

HVDC (HVDC), International Conference on

作者： Zhaoliang Xing Pengfei Wu Helin Xu Zian Ding Jianhong Hao Qingmin Li Zhiyun Han Yujin Guo Ziwei Dong State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co. Ltd. Beijing China State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co. Ltd. Beijing China State Grid Beijing Fangshan Electric Power Supply Co. Ltd. Beijing China

ISBN: (数字)9781728175935

ISBN: (纸本)9781728175942

Polyimide can be used to coat insulation of high frequency power transformer. Surface discharge will lead to insulation failure. In this paper, nano-SiO 2 particles containing 2%, 4%, 6%, 8% and 10% Si element were introduced into polyimide for nano composite modification (Si0, Si2, Si4, Si6, Si8, Si10). It is found that the lifetime of Si0 is the shortest and that of Si10 is the longest. The development process and characteristics of high-frequency surface discharge of Si0 and Si10 are studied. The results show that: in the process of high-frequency surface discharge of pin plate electrode, the damage caused by flashover is greater. The discharge at positive half cycle and polarity reversal is more severe. Compared with Si0, the amplitude and number of discharge of positive half cycle and overall of Si10 are smaller. At first, the discharge amplitude of Si10 is larger but the number of discharge is less. The discharge amplitude of two kinds of films fluctuates in the middle stage, and the discharge frequency of Si10 is more in the later stage. The discharge amplitude and frequency of Si0 are much higher than that of Si10, which leads to the rapid breakdown of Si0. Further research shows that resistivity of Si10 is less than that of Si0, so discharge of Si10 is more serious in the early stage. The material structure characteristics plays an important role in in the middle and late stage. The interface effect and light energy absorption caused by modification play an important role, so the discharge of Si0 is more serious.

关键词： Discharges (electric) Surface discharges Films Polyimides Surface treatment High frequency power systems

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Fault Ride-Through of Fractional Frequency Offshore Wind power System Based on Modular Multilevel Matrix Converter 8

Fault Ride-Through of Fractional Frequency Offshore Wind Pow...

引用

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

作者： Yu, Jianyang Meng, Yongqing Pan, XiXi Zou, Yichao Huang, Ruanming Zhang, Mengyao Xi'an Jiaotong University Shaanxi Key Laboratory of Smart Grid Xi'an China State Grid Shanghai Municipal Electric Power Company Economic Technology Research Institute Shanghai China

ISBN: (纸本)9781728117225

The fault ride-through (FRT) capacity has become an important grid requirement for fractional frequency offshore wind power system (FFOWPS) based on modular multilevel matrix converter (M3C). In this paper, a novel joint fault ride-through strategy is proposed, which employs a land grid voltage versus offshore grid frequency droop control on M3C. Then, the control system of wind turbines can adjust the generated active power from wind based on the offshore grid frequency. Different form the previous research, the proposed joint control method can maintain the stability of the M3C DC capacitor voltage under the premise of satisfying the reactive power support to the grid under fault condition. Simulation results validate the fault ride-through capability of the FFOWPS in MATLAB/Simulink. © 2019 IEEE.

关键词： MATLAB

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High-Order Sliding Mode Control of Modular Multilevel Matrix Converter for Fractional Frequency Offshore Wind power System 8

High-Order Sliding Mode Control of Modular Multilevel Matrix...

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

作者： Pan, Xixi Meng, Yongqing Li, Sijia Yu, Jianyang Fang, Guohua Huang, Ruanming Zhang, Mengyao Xi'an Jiaotong University Shaanxi Key Laboratory of Smart Grid Xi'an China State Grid Shanghai Municipal Electric Power Company Economic Technology Research Institute Shanghai China

ISBN: (纸本)9781728117225

The Modular Multilevel Matrix Converter (M3C) is a high-power high-voltage direct AC/AC power converter topology which is suitable for low frequency power transmission and distribution systems, such as offshore wind power integration, long-distance FFTS and subsea electric system. But it has obvious non-linear characteristics, complex system structure, high model order and complex control task. Based on the analysis of vector control, this paper proposes a high-order sliding mode control (SMC) strategy combining linear sliding mode with non-singular terminal sliding mode to control a high-order nonlinear system. According to the simulation results of the output waveform quality and power characteristics, the M3C has a better performance under SMC than PI control. The control strategy proposed in this paper can quickly and simply control high-order nonlinear strongly coupled systems, which provides ideas for the stability control of power systems. © 2019 IEEE.

关键词： Sliding mode control

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Feature Extraction Method of Converter Transformer Vibration Signal Based on Multi-feature Fusion

Feature Extraction Method of Converter Transformer Vibration...

引用

Electrical Engineering and Automation (IFEEA), International Forum on

作者： Xuelong Cui Pengfei Wang Gang Yu Zhanlong Zhang Rui Xiao Dali Bureau of EHV Power Transmission Company China Southern Power Grid Dali China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China

ISBN: (数字)9781728196275

ISBN: (纸本)9781728196282

This paper proposes a method for extracting vibration signal characteristics of converter transformers based on multi-feature fusion, in order to effectively identify operating faults of converter transformers. This method uses the actual measured vibration signal of the converter transformer as the experimental signal, carries out EMD (empirical mode decomposition) decomposition, and extracts the waveform index, peak index, margin index, kurtosis index and wavelet entropy of the IMF component to form the features Parameter matrix. Then PCA is used to reduce the dimensionality of the matrix to form the eigenvectors, and finally the fuzzy C-means clustering is used to classify the eigenvectors under different working conditions of the commutation transformer. Experimental results show that the vibration signal feature extraction method based on multi-feature fusion overcomes the limitation of single feature and has good distinguishing performance under different working conditions.

关键词： Vibrations Wavelet transforms Vibration measurement Feature extraction Indexes Matrix decomposition Principal component analysis

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Reliability Analysis for Commercial SiC MOSFETs in Single Pulse and Repetitive Surge Current Test

Reliability Analysis for Commercial SiC MOSFETs in Single Pu...

引用

Prognostics and System Health Management (PHM-Jinan), International Conference on

作者： Hao Wu Chunyan Jiang Qing Guo Na Ren Zhengyun Zhu Bin Wu Xiang Qi State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute CO.LTD Beijing China Zhejiang University Hangzhou China State Grid Taian Power Supply Company Taian China

ISBN: (数字)9781728151816

ISBN: (纸本)9781728151823

SiC MOSFET Body diodes are expected to compete against SiC schottky barrier diodes (SBD) in high power applications. To investigate the surge capability of the body diodes in commercial SiC MOSFETs, single pulse and repetitive surge current tests are processed on the DUTs. In single pulse surge current test, the DUTs are stressed to failure. Compared with the body diodes in SiC trench-gate MOSFETs, the body diodes in SiC planar-gate MOSFETs tend to show better surge capability at all rated current levels. On the other hand, in repetitive surge current test, the degradation of electrical parameters is observed after hundreds of pulse cycles. The degradation mechanism of bipolar degradation and oxide layer degradation has been analyzed.

关键词： Surges Silicon carbide MOSFET Degradation Reliability Logic gates Pulse measurements

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The study on the 3300V low loss FS-IGBT 3

The study on the 3300V low loss FS-IGBT

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

作者： Jin, Rui Wang, Yaohua Gao, Mingchao Zhao, Ge Liu, Jiang Lili Pan, Yan Wu, Jun Min He, Long Global Energy Interconnection Research Institute Company Limited State Key Lab of Advanced Power Transmission Technology Beijing China State Grid Jincheng Electric Power Supply Company Jincheng China

ISBN: (纸本)9781728135847

A 3300V/62.5A low loss FS-IGBT was developed by using the carrier storage layer structure and laser annealing process on the back p+ collector, which could lower the saturation voltage. The effects of laser annealing energy and P+ collector dose on dynamic and static state were studied. Considering the trade-off of the turn-off loss and the saturation voltage, the IGBT was finally designed with the 2.35V saturation voltage, 132mJ turn-off loss. © 2019 IEEE.

关键词： Insulated gate bipolar transistors (IGBT)

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Study on DC side harmonic performance of VSC HVDC

Study on DC side harmonic performance of VSC HVDC

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Sustainable power and Energy Conference (iSPEC)

作者： Zhenyu Du Yuexi Yang Jie Yang Jingsi Chen Tongyue Sun Hangyin Mao State Key Laboratory of Advanced Power Transmission Technology (Global Energy Interconnection Research Institute Co.Ltd.) Beijing China State Grid Zhejiang Electric Power Co. Ltd. Hangzhou China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

This paper presents practical methods for dc side steady state harmonic calculation to analyze harmonic performance along the dc transmission line for the VSC based HVDC system. First, a general dc side harmonic calculation method based on Thevenin's equivalent and IEC general summation law is introduced. The converter and corresponding dc transmission line on both sides are represented as a harmonic voltage source U h and the harmonic impedance Z h seen from each dc side. Different from traditional AC side harmonic calculation which uses the envelopes of harmonic impedance loci, the methods in this paper compute all possible combinations of harmonic impedances covering all operation scenarios, which could easily find out the worst scenario. Second, an improved calculating method for the considering the harmonic model with multi-section dc transmission line harmonic impedance is proposed to improve the computational efficiency. And then, an accommodated harmonic impedance measurement for the dc side application based on small signal injection method is described. Finally, the PSCAD/EMTDC simulation verifications have been carried out based on a ±500kV/2000MW VSC HVDC system to verify the effectiveness of the proposed method.

关键词： power transmission lines Impedance measurement HVDC transmission Computational modeling IEC Harmonic analysis Impedance

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