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

作者： Jing Ge Hongyang Yu Guoliang Zhao Zhanfeng Deng Chaoliang Wang Power Electronics Research Institute State Key Laboratory of Advanced Transmission Technology(Global Energy Interconnection Researching Institute Co. Ltd. Beijing China Smart Grid Research Institute State Grid Zhejiang Electric Power CO. LTD. Research Institute Hangzhou China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

This paper introduces three offshore wind power transmission modes, which are power frequency AC, flexible DC and low-frequency AC. Secondly, the key technologies including parameter design and control strategy of large-capacity AC/AC frequency converter used in low-frequency transmission system are studied. Then, it is verified by system modelling and simulation that one 400 MW offshore wind power transmitted by low-frequency has technical feasibility, and the correctness of parameter design and control strategy is also tested. Finally, it is summarized that within a certain transmission distance, low-frequency transmission mode has better technical and economic performance, and it could be one beneficial alternate mothed of offshore wind power grid-connected to the power frequency mode and flexible DC transmission mode.

关键词： Economics System integration Wind power generation Frequency conversion Internet Frequency control Optimization

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Market Participation of Virtual power Plant with Renewable Generation and Waste Treatment under Incentive and Loss Mechanism

Market Participation of Virtual Power Plant with Renewable G...

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

作者： Shun Ouyang Jingjie Huang Ting Leng Haijun Liu De Zhang Haifeng Yu Hunan Province Collaborative Innovation Center of Clean Energy and Smart Grid Changsha University of Science and Technology Changsha China Economical and Technical Research Institute of State Grid Hunan Electric Power Co. Ltd. Hunan Key Laboratory of Energy Internet Supply-demand and Operation Changsha China

ISBN: (纸本)9781665434263

Aiming at the problems of renewable generation consumption and waste treatment, a market participation method of virtual power plant with renewable generation and waste treatment is proposed. Wastes are incinerated in the waste treatment unit, which contains a gas tank for storing gas caused by waste incineration and can decouple the processes of power generation and flue gas treatment. According to this characteristic, flue gas treatment can be regarded as time-shiftable and adjustable load, and cooperate with renewable generation for coordinated operation of virtual power plant. In order to increase the profit of virtual power plant while reducing the curtailment of renewable generation, an environmentally economic operation model with a goal of maximum benefit of virtual power plant is established, and three kinds of incentive and loss mechanisms are introduced. Results show that the objective function value is the largest under the action of three different mechanisms. The virtual power plant with renewable generation and waste treatment can improve the utilization of renewable energy generation.

关键词： Economics Renewable energy sources Uncertainty Stochastic processes Optimization methods System integration Virtual power plants

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Simulation of Propagation Pattern of Partial Discharge’s Ultrasonic Signal in Oil-Immersed Transformer

Simulation of Propagation Pattern of Partial Discharge’s Ul...

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advanced Electrical Equipment and Reliable Operation (AEERO), International Conference on

作者： Guochao Qian Qingjun Peng Zhongchang Wang Yuepei Zou Jiali Lei Zhixian Zhang Kejie Wu Yuxuan Song Electric Power Research Institute of Yunnan Power Grid Corporation Kunming Yunnan China Three Gorges Water Conservancy Project Cascade Dispatching Communication Center Yichang Hubei China Kunming Power Supply Bureau of Yunnan Power Grid Co. Ltd Kunming Yunnan China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781665402651

The breakdown of insulation caused by partial discharge inside the transformer is an important cause of transformer failure. Ultrasonic detection is a common method for detecting and positioning partial discharge in transformers. According to the needs of rationally arranging ultrasonic sensors and optimizing the positioning algorithm, this paper carries out a simulation analysis of the propagation pattern of partial discharge ultrasonic signals inside the oil-immersed transformer. Based on the finite element simulation software, an oil-immersed transformer model was built, and different geometric structures and material parameters were designed for the transformer’s box, iron core, winding, and oil. The propagation mode of the partial discharge occurring in the oil passage between the high and low voltage windings, the high voltage winding and the outside of the winding in the transformer is analyzed, and the attenuation of the partial discharge ultrasonic signal in the transformer by the winding is studied. This article provides a certain reference for the layout and optimization of built-in ultrasonic sensors in oil-immersed power transformers.

关键词： Partial discharges Optical fiber sensors Oils Windings Oil insulation Acoustics Software

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Task classification-aware data aggregation scheduling algorithm in wireless sensor networks

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International Journal of Mobile Network Design and Innovation 2019年第2期9卷 106-117页

作者： Zou, Hongsen Li, Liang Ao, Chen Zhan, Puning Li, Ning Wang, Zheng State Grid Ningxia Electric Power Co. Ltd. Ningxia750011 China State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing100192 China School of Communication and Information Engineering Chongqing University of Posts and Telecommunications Chongqing400065 China State Grid Ningxia Electric Power Company Maintenance Company Ningxia750011 China

In order to minimise the delay of data aggregation scheduling, a task classification aware data aggregation scheduling algorithm is proposed. Through the multi-power and multi-channel approach of sensor nodes, maximum independent sets are used to construct network topology structure based on data aggregation backbone tree. According to the scheduling priority, the data aggregation scheduling within clusters is achieved by approximating the greedy algorithm. Besides, combined with sparse coefficient, sensing task type reduces the amount of data transmission, and then the level of cluster head nodes in the network is used to achieve data aggregation scheduling between clusters. Numerical results show that the proposed algorithm can reduce cluster heads data traffic and energy consumption, while shortening the data aggregation delay and enhancing the network survivability. © 2019 Inderscience Enterprises Ltd.

关键词： Scheduling

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Study on electromagnetic transient characteristics of multi-terminal LCC-HVDC with DC circuit breaker 16

Study on electromagnetic transient characteristics of multi-...

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16th IET International Conference on AC and DC power transmission, ACDC 2020

作者： Zhong, Jiqun Che, Junru Deng, Jun Qi, Qinya Lu, Wenhao He, Junjia He, Hengxin Yuan, Yating State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hongshan District Wuhan430074 China EHV Maintenance and Test Center China Southern Power Grid Guangzhou510663 China Jiangxi Electric Power Company Research Institute Qingshanhu District Nanchang330096 China

ISBN: (纸本)9781839533914

Based on the ±800 kV 4-terminal LCC-HVDC model of parallel ring network topology, the structural parameters and action timing of the DC circuit breaker are given. The electromagnetic transient of the DC circuit breaker during the breaking process is analyzed for the single pole ground fault condition. The characteristics and the current distribution of the DC circuit breaker after the fault line is cut off, the voltage of the energy-absorbing arrester and the absorbed energy, and the influence of the fault line cutting on the system operation are studied. The effects of current-limiting inductor, breaking time of DC circuit breaker and the delay of phase-shift on the electromagnetic transient characteristics of DC circuit breaker breaking process are pointed out. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： HVDC power transmission

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Leakage Flux-Based Method to Identify the Inrush Current in Transformers

Leakage Flux-Based Method to Identify the Inrush Current in ...

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International Conference on Measuring technology and Mechatronics Automation, ICMTMA

作者： Zheng Yu-Ping Zhang Zhen-Ya Wu Chong-Hao Pan Shu-Yan Zhou Li State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation(State Grid Electric Power Research Institute)NARI Technology Co. Ltd. Nanjing China

ISBN: (数字)9781728170817

ISBN: (纸本)9781728170824

Inrush current occurrence in the power transformers is an unavoidable event that can happen due to energizing no-load transformer. Although various protection methods based on the terminal current and/or voltage have been proposed for transformer protection, the protection malfunction caused by the inrush current still occurs occasionally. In this paper, By comparing different closing angles of transformers with normal condition and differences in leakage flux near the yoke, a simple and accurate method is presented to identify transformer inrush current conditions. The change of the flux density on the leakage flux sensor can effectively identify the transformer inrush current. This identification method has been initially verified in the simulation in Maxwell.

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Electrical Tree Characteristics of Isotactic/Syndiotactic Polypropylene Blend Insulation under Repetitive Impulse Voltage

Electrical Tree Characteristics of Isotactic/Syndiotactic Po...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Wei Yang Fan Yu Zhaoliang Xing Shuofan Zhou Mingsheng Fan Zhonglei Li Boxue Du State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co. Ltd Beijing China Key Laboratory of Smart Grid of Education Ministry School of Electrical and Information Engineering Tianjin University Tianjin China

ISBN: (数字)9781728155111

ISBN: (纸本)9781728155128

Polypropylene (PP) is an emerging direction of thermoplastic and crosslink-free cable insulation material due to its excellent electrical and heat resistance properties. This article concentrates on the electrical tree characteristics of Isotactic PP (iPP)/Syndiotactic PP (sPP) blend insulation under repetitive impulse voltage. Five samples of iPP/sPP blend with sPP contents of 0, 5, 15, 30 and 45 wt% were prepared in aim to analyze the electrical tree initiation and growth characteristics. Electrical tree tests under repetitive impulse voltage were performed by the needle-plate electrode system under 30, 50, 70 and 90°C. When sPP content is between 0 and 15 wt%, the increase of sPP content inhibits the growth of electrical tree. With the continuing increase of sPP content, the initial probability and growth rate of electrical tree rise due to the decrease of deep trap density. The PP blend with 15 wt% sPP shows an excellent resistance to electrical tree, which is attributed to the highest deep trap density. Deep traps are easier to capture injected charges and form homogenous electrical field, which results in the inhibition of charge injection under repetitive impulse voltage. Moreover, the increased deep trap density is conducive to reduce the mean free path of charges and confine impact ionization, resulting in the lower growth speed of electrical tree.

关键词： Polymers Energy states Electric fields Resistance power cables power cable insulation Temperature measurement

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Analysis of Demand Response Development Situation in China

Analysis of Demand Response Development Situation in China

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

作者： Yuting Xu Yan Shi Kai Liu Li Xue Ke Chen Weidong Wang Beijing Key Laboratory of Demand Side Multi-Energy Carriers Optimization and Interaction Technique China Electric Power Research Institute Beijing China State Grid Inner Mongolia Eastern Electric Power Co. Ltd. Power Supply Service Supervision and Support Center Tongliao China Beijing State Grid prehv Transmission Technology Co. Ltd Beijing China Beijing Yuji Powe Technology Co. Ltd Beijing China

ISBN: (纸本)9781665434263

Based on the analysis of the development of demand response related work in the past five years, a detailed introduction was made around the implementation of demand response and supporting policies. Taking three provinces in China as examples, the characteristics of demand response development in each province were analyzed, and the results and shortcomings of demand response in the previous stage were summarized. Combining the current energy transition and carbon emission reduction pressure, the future development trend of demand response was predicted.

关键词： Renewable energy sources Conferences System integration Market research Demand response Regulation Energy efficiency

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A security scheme for intelligent substation communications considering real-time performance

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Journal of Modern power Systems and Clean Energy 2019年第4期7卷 948-961页

作者： Jie ZHANG Jun’e LI Xiong CHEN Ming NI Ting WANG Jianbo LUO Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of EducationSchool of Cyber Science and EngineeringWuhan UniversityWuhan 430072China NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing 211106China NARI Technology Co.Ltd. Nanjing 211106China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106China

Tampering,forgery and theft of the measurement and control messages in a smart grid could cause one breakdown in the power ***,no security measures are employed for communications in intelligent *** services in an intelligent substation have high demands for real-time performance,which must be considered when deploying security *** paper studies the security requirements of communication services in intelligent substations,analyzes the security capabilities and shortages of IEC 62351,and proposes a novel security scheme for intelligent substation *** security scheme covers internal and telecontrol communications,in which the real-time performance of each security measure is *** this scheme,certificateless public key cryptography(CLPKC)is used to avoid the latency of certificate exchange in certificate-based cryptosystem and the problem of key escrow in identity-based cryptosystem;the security measures of generic object-oriented substation event,sampled measure value and manufacturing message specification in IEC 62351 are improved to meet the real-time requirements of the messages as well as to provide new security features to resist repudiation and replay attacks;and the security at transport layer is modified to fit CLPKC,which implements mutual authentication by exchanging ***,a deployment of CLPKC in an intelligent substation is *** also evaluate the security properties of the scheme and analyze the end-to-end delays of secured services by combining theoretical calculation and simulation in this *** results indicate that the proposed scheme meets the requirements of security and real-time performance of communications in intelligent substations.

关键词： Intelligent substation Security measures Certificateless public key cryptography(CLPKC) Real-time communication IEC 62351

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Study on the influence of glass encapsulating on the hygroscopicity of high temperature phase change heat storage materials

Study on the influence of glass encapsulating on the hygrosc...

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作者： Gaoqun Zhang Zhanfeng Deng Yunkun Lu Junjie Hao Zhongkai Ren Liang Chang Hui Tan Linhai Cai Guizhi Xu Tianhao Wang State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co. Ltd. Institute for Advanced Materials and Technology University of Science and Technology Beijing electric power research institute of state grid tianjin electric power company

In this paper, NaCO-KCO/MgO phase change composite was coated on the surface of glass by spray plating, which solved the problem of absorbing moisture and pulverizing of molten salt/MgO phase change thermal storage material in high humidity environment, and reduced the absorbing moisture and pulverizing rate from 31% to 19% without affecting the latent heat of phase change thermal storage material.

关键词： MgO PCM Study on the influence of glass encapsulating on the hygroscopicity of high temperature phase change heat storage materials

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