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中国物理学会第二十二届全国静电学术年会

作者： JIN Fu-bao LIANG Bin ZHOU Yuang-xiang ZHONG Liu ZHANG Ling School Of Water Resources and Electric Power Qinghai University Xining80016China State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Ele

Aiming at the special working environment of composite insulators at high altitude area,we investigate the creepage discharge characteristics of aged HTV(High Temperature Vulcanized,HTV)silicone rubber materials by UV(ultraviolet radiation,UV)aging method in this *** results show that the creepage discharge flashover voltage first increased,then decreased as aging time increasing,whereas the creepage discharge initial voltage was not significantly affected by aging *** aging time has little effect on creepage discharge *** aging time contributed to shorter endurance time and higher creepage discharge development *** magnitude of discharges increase rapidly in a short time after *** partial discharge detection system was used to detect the whole creepage discharge development *** to the partial discharge characteristics parameters of creepage discharge,we divided the development process of creepage discharge into initial stage,developmental stage,accelerating stage,and critical breakdown *** with characteristic parameters of unaged HTV silicone rubber,the characteristic parameters for the aged HTV silicone rubber exhibited less fluctuation and clear *** aging not only has an effect on the physicochemical and hydrophobic properties of the materials,but also accelerates the development process of creepage discharge under AC *** should be given enough attention in engineering practice,especially at high altitude area.

关键词： High temperature vulcanized silicone rubber creepage discharge UV aging creepage discharge inception voltage creepage discharge flashover voltage high altitude characteristic parameters

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Estimation and Measurement of Closed-loop Delays in the Actual WACS of Guizhou power Grid

Estimation and Measurement of Closed-loop Delays in the Actu...

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IEEE power and Energy Society General Meeting

作者： Fang Zhang Lin Cheng Xiong Li Min Zeng Yuanzhang Sun Joe H. Chow State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University School of Electrical Engineering Wuhan University Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute

ISBN: (纸本)9781509041695

The characterization of the closed-loop delays in a wide-area control system (WACS) is an important foundation for further research. The method to estimate and measure the closed-loop delay in actual WACSs were proposed in this paper. Then, the closed-loop delays in the actual WACS in Guizhou power Grid in China were measured and analyzed. Also, the measured delays were used to verify the normal distribution estimation model proposed in previous research. The results indicate that the closed-loop delay in the WACS followed a normal distribution.

关键词： CLOSED LOOP power grids Gaussian distribution delay WACS

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Effects of Temperature on Creepage Discharge Characteristics in Oil-Impregnated Pressboard Insulation under Combined AC-DC Voltage

Effects of Temperature on Creepage Discharge Characteristics...

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中国物理学会第二十二届全国静电学术年会

The characteristics of oil-impregnated pressboard(OIP)insulation in converter transformer are different with that in traditional AC transformers due to the complication of voltage applied on valve side windings of converter *** is a serious lack of empirical research on effect of temperature on creepage discharge characteristics in OIP under combined AC-DC ***,this study investigates the characteristics spectrum of creepage discharge in OIP under combined AC-DC voltage,and explores the effect of temperature on creepage discharge characteristics under different temperature from 70 to 110℃.The experimental results show that the partial discharge inception voltage and flashover voltage decrease as temperature *** times of low amplitude discharge(LAD)decrease and amplitude of LAD *** temperature had an accelerating effect on the development of creepage discharge in the OIP under combined AC-DC voltage Meanwhile,the times of high amplitude discharge(HAD)gradually increase at each stage of creepage discharge with higher *** analysis indicates that the charge carriers easily accumulate and quickly migrate directional movement along the electric field ahead of *** residual charge carriers are more easily dissipated after ***'hump'region of LAD moves to the direction of higher discharge *** interval time between two consecutive discharges drastically *** HAD intensively appear,result in accelerating the development of creepage discharge in OIP insulation.

关键词： Oil-impregnated pressboard insulation temperature combined AC-DC voltage creepage discharge inception voltage flashover voltage

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Coordinated Wholesale and Retail Market Mechanism for Providing Demand-side Flexibility

Coordinated Wholesale and Retail Market Mechanism for Provid...

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Sustainable power and Energy Conference (iSPEC)

作者： Gang Luo Yujun He Chen Zhao Xuan Zhang Shaohua Lin Yue Zhao Dispatch and Control Center Guangdong Power Grid Co. Ltd Guangzhou China State Key Lab of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing China

With the trend of electricity market deregulation for recent decades, the consumers at demand-side are progressively encouraged to trade the power in competitive market environment. Conventionally, only large-scale consumers participate directly in the wholesale market that adopts spot energy pricing. Most small-scale consumers are involved in the retail market that offers non-varying tariff predefined by retailers or utility companies. In this work, we investigate a framework of coordinated wholesale and retail market structure that enables consumers in the retail market to reflect the spot price and improve the power system flexibility for the high penetration of renewables. Then, market behaviors of demand-side participants with the proposed market mechanism and some related business models are discussed. The following participation modes for consumers could be opted including: direct trade, trade agented by retailers or organized in virtual power plant (VPP). For a pool-based trade at demand-side, a bi-level market clearing mechanism at transmission and distribution levels is explained. This mechanism seeks to optimize the global demand profile for hosting renewables while solving the operating constraint of loads and local networks. This study can offer constructive advises to promote further development of China's electricity market.

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Wind farm active voltage regulation strategy of transient support improvement 8

Wind farm active voltage regulation strategy of transient su...

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8th Renewable power generation Conference, RPG 2019

作者： Yang, Cui Peng, Song Xuekun, Cheng Ying, Qiao Xiaosheng, Wang Jingbo, Liu State Grid Jibei Electric Power Co.Ltd. Research Institute North China Electric Power Research Institute Co. Ltd. Xicheng District Beijing China Grid-connected Operation Technology Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory Xicheng District Beijing China State Key Lab of Control and Simulation of Power Systems and Generation Equipment Dept. of Electrical Engineering Tsinghua University Haidian District Beijing China

ISBN: (纸本)9781839531255

The cumulative installed capacity of wind power worldwide has grown rapidly in recent years. Fixed reactive power control is adopted by wind turbines (WTs) to receive cycle instruction of wind farm (WF) automatic voltage control system (AVCS). It does not have active voltage regulation (AVR) capability, which reduces the reliability of power system operation. Firstly, two ways of WTs AVR which QV droop control and Vac control mode are introduced in this paper. On the basis, the problems of reactive power circulation and control points inconsistency during multiWTs voltage regulation are discussed. The problems are solved by coordination of WTs of WF AVR strategy. WF voltage transient support capability is promoted by the strategy. Effectiveness is verified by simulation case of the proposed method. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Reactive power

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Operation Strategy Selection of a District Multi-Energy System Based on Environmental Impact

Operation Strategy Selection of a District Multi-Energy Syst...

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

作者： Huichao Kong Yu Luo Xuejin Huang Lin Cheng Liting Tian Ning Qi Dongguan Power Supply Bureau Guangdong Power Grid Co. Ltd. Dongguan China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China

District multi-energy systems are constructed to reduce environmental impact of energy consumption. This paper introduces a three-layer structure for district energy systems. And two representative operation strategies are proposed focusing on the energy services of the system. The operation strategies are applied to a district which consists of electricity distribution network, natural gas pipe network and heat pipe network. The energy efficiency and CO 2 emission are calculated under different scenarios. The results show that the system operation strategy has a significant impact on the environmental indices. It is suggested to choose the scheme with a priority of electric requirement for the investigated system.

关键词： Resistance heating Thermal loading power systems Energy efficiency Production Buildings Heat pumps

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Three-phase steady-state models for distributed generators

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2014年第10期34卷 1509-1518页

作者： Ju, Yuntao Wu, Wenchuan Zhang, Boming Guo, Kunya Wang, Yingnan State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China Liaoning Provincial Power Grid Corp. Shenyang Power Supply Company Shenyang 110021 Liaoning Province China

Low voltage distribution network usually operates under three-phase unbalanced conditions. And the distributed generators (DGs), integrated with distribution network, show different behaviors under different control strategies for unbalanced operating scenarios. For accurate three-phase power flow analysis, detailed three-phase DG models are needed. A unified technique was proposed to formulate the three-phase models for different DGs (include synchronous generator, induction generator, power electronic interface generator, doubly fed induction generator). Comparisons between the proposed models and existing models were also presented in this paper and the models were proved to be right. The proposed approach is suitable for distributed generator unbalanced analysis and is also suitable to model flexible alternative current transmission (FACT) devices. © 2014 Chin. Soc. for Elec. Eng.

关键词： Distributed power generation

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Load Regulation Strategies of Solid Oxide Electrolysis System Coupled with External Heat Sources

Load Regulation Strategies of Solid Oxide Electrolysis Syste...

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243rd ECS Meeting

作者： Cui, Tonghui Han, Minfang Ni, Meng Fuel Cell and Energy Storage Center Department of Energy and Power Engineering State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing100084 China Tsinghua Innovation Center in Guangdong Dongguan523808 China Department of Building and Real Estate Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong

ISBN: (纸本)9781607685395

Solid oxide electrolysis system requires electrical and thermal energy. Five scenarios are defined according to various cases of external heat sources coupling and electrical energy sources. Three methods are proposed to track variations in electrical or thermal load, including constant flow rate (F method), constant steam utilization (Us method) and constant cell operating voltage (V method). Through system process simulation, the applicability of three methods in different scenarios is explored to obtain load regulation strategies. In the scenario coupled with low-temperature heat and intermittent power and the scenario with no heat coupling, the F method is preferred at high loads and the V method is preferred at low loads, while it is the opposite in the scenario coupled with high-temperature heat and intermittent power. The V method is preferred at low loads in the scenario coupled with low-temperature heat and high loads in the scenario coupled with high-temperature heat. © The Electrochemical Society.

关键词： Temperature

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Deep transfer network with joint distribution adaptation: A new intelligent fault diagnosis framework for industry application

arXiv

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arXiv 2018年

作者： Han, Te Liu, Chao Yang, Wenguang Jiang, Dongxiang Department of Energy and Power Engineering Tsinghua University Beijing100084 China State Key Lab of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing100084 China

In recent years, an increasing popularity of deep learning model for intelligent condition monitoring and diagnosis as well as prognostics used for mechanical systems and structures has been observed. In the previous studies, however, a major assumption accepted by default, is that the training and testing data are taking from same feature distribution. Unfortunately, this assumption is mostly invalid in real application, resulting in a certain lack of applicability for the traditional diagnosis approaches. Inspired by the idea of transfer learning that leverages the knowledge learnt from rich labeled data in source domain to facilitate diagnosing a new but similar target task, a new intelligent fault diagnosis framework, i.e., deep transfer network (DTN), which generalizes deep learning model to domain adaptation scenario, is proposed in this paper. By extending the marginal distribution adaptation (MDA) to joint distribution adaptation (JDA), the proposed framework can exploit the discrimination structures associated with the labeled data in source domain to adapt the conditional distribution of unlabeled target data, and thus guarantee a more accurate distribution matching. Extensive empirical evaluations on three fault datasets validate the applicability and practicability of DTN, while achieving many state-of-the-art transfer results in terms of diverse operating conditions, fault severities and fault types. Copyright © 2018, The Authors. All rights reserved.

关键词： Fault detection

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Nonlinear E-field simulation of HVDC Converter Transformer Busing and Its Structure Optimization With RBF Neural Network and NSGA-II Algorithm

Nonlinear E-field Simulation of HVDC Converter Transformer B...

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IEEE International Conference on power and Energy systems (ICPES)

作者： Yongsheng He Shiling Zhang Zongxiang Lu Pengbo Wang State Grid Chongqing Electric Power Company Chongqing Electric Power Research Institute Chongqing China State Key Lab of Control and Simulation of Power Systems and Generation Equipment Haidian China Dept name of State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing China

Static DC and PR are typical operation conditions of HVDC converter transformer bushing outlet device, moreover, the electrical parameters of RIP, transformer oil and OIP have the nonlinear relationship with E-field stress and temperature. Under the temperature gradient, the electrical parameters will modify the static DC and PR E-field distribution of the composite insulation. In order to simulate static DC and PR electric field of the composite insulation structure, this paper established the full model of the converter transformer outlet. Then, the structure parameters of converter transformer outlet have been optimized using combined RBF neural network and NSGA-II algorithm. Moreover, electric field verification calculation has been carried out under AC and PR conditions. The results show that under uniform temperature condition, E-field strength is larger than that under iso-thermal condition. The overshoot coefficient of the bushing end and barrier reach 65% and 45%, respectively. The study can provide reference for the design of outlet structure of the converter transformer.

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