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International Conference on High Voltage Engineering and Application, ICHVE

作者： Shen Wei Wang Sen Wu Tao Yang Fan Gao Bing Liu Zhuoran Electric Power Research Institute State Grid Shaanxi Electric Power Company Xi'an China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing China

ISBN: (数字)9781728155111

ISBN: (纸本)9781728155128

During the switching operation of GIS Substation, the Transient Enclosure Voltage (TEV)and the Transient Ground Potential Rise (TGPR) will occur, which will have a negative impact on the safety of substation. In this paper, TEV and TGPR are measured and analyzed in a 750kV substation at different locations of GIS, under three types of operation of disconnect switch and circuit breaker, include: single closing of disconnect switch, single closing of circuit breaker, three times opening and closing of circuit breaker. From the results, the maximum value of TEV and TGPR is 22.8 kV and 19.6kV, respectively, and the TGPR is higher than the TEV at many measuring points; Compared with the circuit breaker closing operation, the disconnect switch closing operation produces less electromagnetic oscillation energy, but it have longer macro-pulse duration and more breakdown times, which explained that the failure of secondary system caused by the operation of disconnect switch is more than caused by the operation of circuit breaker; Three times opening and closing operation of the circuit breaker produces stronger electromagnetic energy and more breakdown than single closing operation of the circuit breaker.

关键词： Circuit breakers Transient analysis Substations Gas insulation Switching circuits Switches Insulators

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A Reliability-based DG Planning Method against Ice Storm Weather

A Reliability-based DG Planning Method against Ice Storm Wea...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Lin, Chaofan Fang, Di Bie, Zhaohong Gao, Liang State Key Laboratory of Electrical Insulation and Power Equipment Shaanxi Province Key Laboratory of Smart Grid Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781728135205

The ice storm, characterized by freezing rain, would cause great damages to power system transmission lines and towers, which significantly affects the normal power supply. Distributed generation (DG) installation is considered as an efficient way to improve the power system resilience against natural hazards. However, current studies have hardly focused on the reliability-based DG planning considering the extreme weathers. To address the problem, this paper establishes a complete scheme for DG planning under a specific ice storm weather example. After consecutive three steps of ice storm modelling, reliability evaluation and optimization, an optimal DG allocation plan is obtained to reduce the ice-storm-related economic loss as much as possible. Case study on IEEE 33 bus system shows that the DG plan by the proposed method will help system operator reduce nearly 2.8 million yuan's loss a year, which shows great practicability and advantage in future analysis and decision of distribution system planning. © 2019 IEEE.

关键词： Reliability

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Measurement of transformer core loss based on low-frequency triangular wave

EEA - Electrotehnica, Electronica, Automatica

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EEA - Electrotehnica, Electronica, Automatica 2020年第1期68卷 59-67页

作者： Chen, Xuejun Yang, Ning Yang, Yongming Key Laboratory of Fujian Universities for New Energy Equipment Testing Putian University Putian351100 China State Grid Ningxia Electric Power company of limited liability Yinchuan750001 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China

For the no-load test of transformer with large capacity and voltage level, it is difficult to manufacture large-capacity variable-frequency sine wave power supply. In order to reduce the capacity and manufacturing difficulty of test power supply, a separation measurement and equivalent method of transformer core loss based on low-frequency triangular wave is proposed. This method is based on Bertotti's core loss separation model, constructs a matrix equation, uses the principle of least squares method to solve the hysteresis loss coefficient, eddy current loss coefficient and excess loss coefficient, and then converts core loss to that under power frequency (50 Hz) sine wave excitation. In addition, in the case of whether excess loss is considered, the analysis and comparison after conversion are carried out respectively. The experimental results show that the core loss based on the proposed method has a good agreement with that under the same frequency actual sine wave excitation. When the voltage amplitude is below 115V, the relative errors of the core losses without considering excess loss are smaller than those converted with excess loss. While the voltage amplitude is greater than 115V, the relative errors of the former are greater than the latter. And in both cases, except for the start of the test, the relative errors between the calculated core losses of triangular wave and the measured sine wave are less than 2.8%. This method has high conversion accuracy and engineering application value. © 2020, Editura ELECTRA. All rights reserved.

关键词： Least squares approximations

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Correction: Experimental Research and Theoretical Analysis on Flame Spreading Behaviors of Transformer Insulating Paperboard Under Different Inclined Angles

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Fire technology 2022年第3期60卷 2251-2251页

作者： Zhang, Jiaqing Shang, Fengju Zhu, Taiyun Guo, Yi Liang, Xuan Wang, Qiang Anhui Province Key Laboratory of Electric Fire and Safety Protection State Grid Anhui Electric Power Research Institute Hefei China State Grid Laboratory of Fire Protection for Transmission and Distribution Facilities Hefei China School of Automotive and Transportation Engineering Hefei University of Technology Hefei China

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Mode for reducing wind curtailment based on battery transportation

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Journal of Modern power Systems and Clean Energy 2018年第6期6卷 1158-1171页

作者： Zhanlong ZHANG Daojun MEI Han JIANG Guohua LIU Hongpeng HE Yue CHEN State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Quzhou Power Supply Company State Grid Electric Power Company

Renewable energy sources, such as wind and solar, face several obstacles, including curtailment, where the generated energy exceeds local demand and production must be reduced because of limited transmission ***, consumer demand for large-capacity batteries is expanding given the recent rapid development of electric vehicles(EVs) and plug-in hybrid EVs. A batterycharging mode, in which discharged batteries are transported from battery exchange stations in high-load areas to wind farms, is proposed to alleviate curtailment. In this study, batteries store otherwise curtailed energy and smooth the wind power output simultaneously. The structure of the battery-charging device is discussed, and the concept of a battery-charging container is proposed. The control principle of the battery-charging management unit is presented with a simulation model constructed in the PSCAD/EMTDC environment. A case study is simulated,and the feasibility of the mode is analyzed considering the levelized cost and energy losses. Simulation results show that this mode is a feasible solution to alleviating wind curtailment and providing fresh impetus for developing EV battery exchanges.

关键词： Wind curtailment Battery-charging container Transportation power smoothing

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Research on new ice melting technology for overhead lines without power failure

Research on new ice melting technology for overhead lines wi...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Yabing Zhou Xiaoliang Tang Fang Yang Yuning Hou Qingyuan Power Supply Bureau China Southern Power Grid Address Qingyuan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9784886864192

ISBN: (纸本)9781728189307

In this paper, by combining the adjustable reactor with the grounding transformer, first determine the value of the load power, and then check the line current during normal operation. Then, at the end of the line, it is connected to the lightning conductor through the smart switch, and the adjustable reactor The grounding transformer forms the ice melting current loop, and the voltage and current on the load side remain basically unchanged during the ice melting, so the ice can be melted without power failure.

关键词： Ice Wires power supplies Inductors Switches Reactive power Inductance

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Research on Compact Design of Multi-chamber Arc-extinguishing Structure for Lightning Protection

Research on Compact Design of Multi-chamber Arc-extinguishin...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Shizun Pu Wenbin Jia Hongmei Li Qingjun Peng Ronghua Yang Tao Yuan Dehong Power Supply Bureau of Yunnan Power Grid Corporation Dehong Yunnan China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China Electric Power Research Institute of Yunnan Power Grid Corporation organization Kunming Yunnan China

ISBN: (数字)9781728155111

ISBN: (纸本)9781728155128

Multi-chamber arc-extinguishing structure is the latest effective measure to extinguish power frequency follow current arc caused by lightning flashover. However, the higher the voltage level, the more chambers are needed, and the size of multi-chamber structure is too large, which is not conducive to line installation. In order to solve the problem existing in the use of multi-chamber structure, a spiral series compact design of multi-chamber arc-extinguishing structure is proposed in this paper. Impact current test platform is built and the arc path distribution and arc-extinguishing performance of compact multi-chamber arc-extinguishing structure are analyzed. The impact arc of the compact multi-chamber arc-extinguishing structure is effectively confined in the chamber, which verifies the effectiveness of the compact design of the multi-chamber structure. And the number of chambers in the unit insulation height can be effectively increased by using compact design method.

关键词： Electrodes Spirals Electric breakdown Arresters Lightning protection Insulation Insulators

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The Influence of Wind Load on the Mechanical Properties of the Main Transformer Bushing End of UHV Substation

The Influence of Wind Load on the Mechanical Properties of t...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Xuezhen Si Jinyang Wang Kai Xie Yaguang Tao Zhuli Liu Pengliang Ren Xiaohui Yang Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Henan China School of Mechanical and Power Engineering Zhengzhou University Henan China

ISBN: (数字)9781728155111

ISBN: (纸本)9781728155128

The main transformer of substation mostly works in the wild, and its bushing end is prone to deformation and fracture. This paper takes ABAQUS as the platform and a bushing end of main transformer as the research object to establish a fine finite model. And the effect of wind load on mechanical properties of the bushing end was studied by taking wind speed and direction of dangerous condition as parameters. The results show that the terminal board and the bushing terminal are the weak links of structure, with large stresses and displacements. And the end cover is warped under the compression of the bushing terminal. The research results provide a reference for the structure's design, optimization and local strengthening measure of bushing ends and substations.

关键词： Insulators Stress Conductors Substations Finite element analysis Clamps Strain

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Control strategy of doubly-fed induction generator during the grid voltage swell

Control strategy of doubly-fed induction generator during th...

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作者： Le, Zou Xueguang, Wu Longze, Kou Dong, Liu Fangyuan, Li Mingxiao, Han North China Electronic Power University Beijing China Global Energy Interconnection Research Institute Beijing China Beijing Key Laboratory of DC grid Technology and Simulation Beijing China State Key Laboratory of Advanced Power Transmission Technology Beijing China

This study firstly derives the relationship between the grid voltage and the rotor current of doubly-fed induction generator (DFIG) during the grid voltage swell. Then, an effective control strategy aiming to restrain rotor over-current is proposed and the control strategy of the grid-side converter is also improved. The proposed rotor current suppression and grid voltage suppression method, cooperating with the DC chopper, can not only solve the problem of short circuit of the rotor side converter resulting from the frequent switching of crowbar device, but also maximally improve the capability of wind turbine in dynamic reactive power support without adding any other power electronic devices. With the help of this control strategy, the wind turbine could maintain its normal operation even during the fault and the high voltage ride through of wind turbine can be achieved. As a result, the stability of the wind power integration is significantly improved. Finally, the simulations and analysis in the power systems computer aided design (PSCAD)/electromagnetic transients including DC (EMTDC) verify the effectiveness and feasibility of the proposed control scheme. © 2019 Institution of Engineering and *** right reserved.

关键词： Wind turbines

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Scenario Generation for Cooling, Heating, and power Loads Using Generative Moment Matching Networks

arXiv

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arXiv 2021年

作者： Liao, Wenlong Wang, Yusen Wang, Yuelong Powell, Kody Liu, Qi Yang, Zhe The Department of Energy Technology Aalborg University Aalborg9220 Denmark The School of Electrical Engineering and Computer Science KTH Royal Institute of Technology StockholmSE-100 44 Sweden The State Grid Tianjin Chengxi Electric Power Supply Branch Tianjin 300100 China The Department of Chemical Engineering University of Utah UT84112 United States The Key Laboratory of Smart Grid Ministry of Education Tianjin University Tianjin 300072 China

Scenario generations of cooling, heating, and power loads are of great significance for the economic operation and stability analysis of integrated energy systems. In this paper, a novel deep generative network is proposed to model cooling, heating, and power load curves based on a generative moment matching networks (GMMN) where an auto-encoder transforms high-dimensional load curves into low-dimensional latent variables and the maximum mean discrepancy represents the similarity metrics between the generated samples and the real samples. After training the model, the new scenarios are generated by feeding Gaussian noises to the scenario generator of the GMMN. Unlike the explicit density models, the proposed GMMN does not need to artificially assume the probability distribution of the load curves, which leads to stronger universality. The simulation results show that the GMMN not only fits the probability distribution of multi-class load curves well, but also accurately captures the shape (e.g., large peaks, fast ramps, and fluctuation), frequency-domain characteristics, and temporal-spatial correlations of cooling, heating, and power loads. Furthermore, the energy consumption of generated samples closely resembles that of real samples. © 2021, CC BY-NC-ND.

关键词： Gaussian noise (electronic)

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