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Characteristics calculation and pattern recognition for partial discharge of cable joint

Characteristics calculation and pattern recognition for part...

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2014 International Conference on Communication Technology and Application(CTA2014)

作者： Y.F.Xia J.F.Gui X.Y.Chen S.Y.Gao J.H.Huang J.H.Lin Dongguan Power Breuse of Guangdong Grid School of Electrical Engineering Beijing Jiaotong University Department of Electrical Engineering Tsinghua University State Key Lab of Control and Simulation of Power Systems and Generation Equipments

ISBN: (纸本)9781845649302

For PD pattern recognition, six kinds of typical cable fault models are made and tested. Characteristics are calculated from test data. Multiple statistical characteristics of PD distribution map are calculated and pattern vectors are formed. Artificial neural network is trained for recognition. Through the selection and adjustment of characteristics and network parameters, recognition effect with satisfactory result is obtained.

关键词： cable joint partial discharge recognition

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Research on Peak Load Regulation Capacity Planning for Long-term Market

Research on Peak Load Regulation Capacity Planning for Long-...

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2017 International Electrical and Energy Conference (CIEEC 2017)

作者： Jiheng Jiang Ying Qiao Zongxiang Lu Ningbo Wang Jin Li Kun Ding State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept.of Electrical Engineering Tsinghua University Key Laboratory of Wind Power Integration Operation and Control of Gansu Province Gansu Electric Power Corporation Wind Power Technology Center

Insufficient power capacity for peak load regulation has caused loss of wind power accommodation in China.A regulation capacity market is under consideration to encourage more peak regulation service,thus how much the market would be is important for each participant.A new peak-load regulation capacity planning method is proposed for long-term market based on the wind power curtailment evaluation model using probabilistic production *** method is suitable for the situation in the planning stage without the knowledge of detailed sequences of load and renewable power,and includes modeling of two peak load regulation measures,increasing the adjustable capacity and to shift some long-lasting units to on/off cycling units.A typical area in China is studied in the paper to evaluate the actual effects of different measures.

关键词： adjustable capacity capacity planning peak load regulation probabilistic production simulation

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Research on General Terminal of Intelligent Measurement and control of Distribution Network Based on Open Architecture

Research on General Terminal of Intelligent Measurement and ...

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Telecommunications, Optics and Computer Science (TOCS), IEEE Conference on

作者： Xiaobing Xiao Yongxiang Cai Xiaomeng He Yue Li Yujie Ding Ergang Zhao Electric Power Research Institute of Guizhou Power Grid Co. Ltd Guiyang China Generation Equipments Dept. of Electrical Engineering State Key Lab of Control and Simulation of Power Systems Beijing China

ISBN: (纸本)9781665470544

With the continuous advancement of the construction of new power systems, the data information of the power system is increasing exponentially, and the spatiotemporal distribution of the use of smart terminals and electrical equipment is more scattered. Data collection and analysis of traditional power systems will be a huge challenge. In order to meet the actual needs of multi-scenario, multi-service, and changeable measurement and control objects of intelligent distribution network, this paper firstly studies the design of general terminal open architecture for distribution network multi-measurement and control scenarios, proposes a data service architecture based on open architecture, and establishes a self-description-based open architecture design. The unified information model of the Internet of Things protocol, research and development of intelligent measurement, and the controlling of universal terminals meet multiple communication methods, and realize the deployment verification of intelligent measurement.

关键词： power measurement Computer architecture Distribution networks Data collection Optical variables measurement Hardware power systems

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Research on Reliability of Ad hoc Network Communication in UAVs Formations

Research on Reliability of Ad hoc Network Communication in U...

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IEEE International Symposium on Electromagnetic Compatibility (EMC-Beijing)

作者： Yanchu Li Shufang Li Qingqing Ding Chao Wang School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China State Key Lab of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing China

As an important performance index of the UAV Ad hoc network, network reliability is a great significance for the performance evaluation of the UAV network system, and provides a direction for the selection of the UAVs formations. In this paper, based on the 3D Gauss Markov moving model, we modeled the motion mode of the UAV group. By using the Weibull distribution to sample the failure of the fleet, and through the correlation matrix which characterizes the connectivity state of network nodes in the time domain, we studied and compare the reliability of the self-organizing network of the UAV group with different formations. It provides a basis for selecting the formations of the UAVs for different network requirements.

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Evaluation of Prediction Choice in Economic Dispatch with Uncertainty

Evaluation of Prediction Choice in Economic Dispatch with Un...

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2017 International Electrical and Energy Conference (CIEEC 2017)

作者： Fan Zhang Ying Qiao Zongxiang Lu Ningbo Wang Jin Li Kun Ding State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept.of Electrical EngineeringTsinghua University Key Laboratory of Wind Power Integration Operation and Control of Gansu Province Gansu Electric Power Corporation Wind Power Technology Center

The unavoidable wind power forecast error results in the pervasive uncertainty in power system economic *** order to solve optimization problem such as economic dispatch with random variables,the commonest and simplest method is using a deterministic value to replace this random *** kinds of predictions are used such as maximumlikelihood approximation,expectation and *** study analyses the effect of these prediction choices on uncertainty of power system via comparing their statistical *** is shown that when the wind power output is very volatile,the quality of these prediction choices is not ***,a simplified three-unit thermal system and a tenunit system are studied for illustrating the consequence of statistical inconsistency.

关键词： Economic Dispatch expectation maximumlikelihood prediction uncertainty wind power forecast error

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Performance of negative sequence pilot protection applications in transmission line with open-phase operation

Performance of negative sequence pilot protection applicatio...

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Bin Wang Xinzhou Dong Zhiqian Bo Andrew Klimek State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China AREVA T and D UK Limited Stafford UK

ISBN: (纸本)9781424452293

The performance of the negative sequence pilot protection (NSPP) is less deteriorated by the phase-ground shunt capacitance since the negative sequence current loops in phase-phase lines. Hence NSPP is a good candidate for the main protection in UHV lines with the special characteristic of larger charging current. But as we all known, NSPP is not suit to the open-phase operations in transmission line, which limited its wide applications in HV/EHV lines in history. In response to this question, the performance of NSPP in transmission line with open-phase operation is analyzed, and the mal-operation reason of the NSPP relay is discovered. Then an improved algorithm for faults detection is proposed in open-phase line, and the simulation results verified its validity. The work in this paper is only the basic steps, the more research, such as the sensitivity and transient characteristics of ground fault detections in open-phase line should be discussed further.

关键词： Protection Transmission lines Capacitance Fault detection Voltage control power system simulation power system transients History Performance analysis Relays

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A fast transient simulation model of DFIG based on the piecewise averaging method

A fast transient simulation model of DFIG based on the piece...

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2nd IET Renewable power generation Conference (RPG 2013)

作者： G. Feng Y. Xu Y. Chen H. Gao L. Chen Tsinghua University Beijing Beijing CN State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Beijing 100084 China

ISBN: (纸本)9781629936017

Due to the power electronic devices in doubly fed induction generators (DFIG), it is very time consuming to simulate the electromagnetic transients of DFIG using its detailed model. Thus it is necessary to have appropriately simplified model of DFIG that maintains desirable accuracy. In this paper, the piecewise averaged model of PWM converters is introduced and applied to the modelling of DFIG. The proposed model divides the simulation time interval into switching periods and recalculates the averaged state equations of PWM converters in each switching cycle. In addition, a predictorcorrector based EMTP algorithm is designed to iteratively solve the model. Instead of treating switching events at the time points when they happen, the new algorithm solves all the switching instants in a switching cycle at the same time, which avoids frequency modification of the system conductance matrix and speeds up EMT simulations of DFIG. simulation results of a single-machine infinity bus system with a DFIG show that the proposed model and algorithm can achieve satisfactory accuracy and efficiency.

关键词： Average modelling Doubly fed induction generators Electromagnetic transient simulation

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Two-stage EEG source reconstruction by using the layered recursive algorithm and source contracting method

Two-stage EEG source reconstruction by using the layered rec...

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作者： Zou, J. Xie, Y.Q. Dong, G.Y. State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China School of Physics Peking University Beijing China Prov.-Min. Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Department of Electrical Engineering Hebei University of Technology Tianjin 300130 China

A two-stage electroencephalogram (EEG) source tomography method is proposed. First, the layer recursive algorithm (LRA) is developed to calculate the cortical potentials from the scalp potentials by using the finite volume method, which can improve spatial resolution of EEG data and be called high-resolution EEG (HIEEG). As a result, the spatial resolution is improved over that obtained with the conventional EEG. Second, the source contracting method is used to localize the equivalent electrical sources inside the brain based on HIEEG data. The applications demonstrate the effectiveness of the method proposed. The LRA provides an alternative implementation to HIEEG. © 2006 IEEE.

关键词： Electroencephalography

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Interrupter Pressure Measurement of a 252 kV SF6 Circuit Breaker

Interrupter Pressure Measurement of a 252 kV SF6 Circuit Bre...

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2011 1st International Conference on Electric power Equipment- Switching Technology(第一届电力设备开断技术国际会议 ICEPE)

作者： Weidong Liu Yonggang Guan Wenyi Li Junhui Wu State Key Lab of Control and Simulation of Power Systems and Generation Equipments (Dept.of Electric Henan Pinggao Electric Co. LTD. Pingdingshan 467001 Henan Province China

ISBN: (纸本)9781457712739

The transient pressure process, which determined the gas blasting in the interrupter of SF6 circuit breaker, have attracted the attention of designer and developer for long time. In this investigation, a onload SF6 interrupter pressure measurement method was established with piezoresistive pressure transducer and insulating-tube. The pressures in the puffer cylinder, at the upstream, throat and downstream of nozzle have been measured. The difference of gas blowing characteristics between N2 and SF6 has been pointed out. The insulating-tube can effectively protect the pressure transducer from the high voltage and high temperature during on-load interrupting. It was found that the arc process can cause high frequency oscillations to superimpose upon the pressure waveforms during on-load interrupting.

关键词： interrupters Pressure Transducers Sulfur Hexafluoride Pressure measurement High Voltage Designers nozzles pressure process

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Effect of frequency on electrical tree characteristics in silicone rubber

Effect of frequency on electrical tree characteristics in si...

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International Conference on Properties and Applications of Properties and Applications of Dielectric Materials

作者： Qiong Nie Yuanxiang Zhou Zhengzheng Chen Haihang Chen State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept of Electrical Engineering Tsinghua University Beijing 100084 China Dept of Electrical Engineering Zhengzhou University 450001 China

As an advanced internal insulating material, silicone rubber has been widely used in extra high voltage prefabricated cable accessories. However, few studies were focused on the influence of frequency on the electrical tree characteristics and the damage mechanism of such insulation is still unknown. In this paper, the characteristics of electrical tree in silicone rubber under AC voltage of different frequency ranging from 50 Hz to 130 kHz were studied. The tree initiation voltage was measured at room-temperature and the processes of electrical tree were observed via a digital micro-observing system. From the experiments, it was found that the electrical tree in silicone rubber is greatly affected by the frequency of applied voltage. With the increase of frequency, tree initiation voltage of silicone rubber decreases. And the frequency can be separated into four stages, while tree initiation voltage appears different magnitude of decrease. There are 3 kinds of electrical tree during the experiments: branch tree, trunk tree and pine tree. The branch tree and pine tree are the primary shapes in the range of low frequency, while the bush tree is the primary shape in the range of HF. The dielectric spectroscopy of silicone rubber was also measured. At last, the influence of frequency on electrical tree in silicone rubber was analyzed. The repeated electro-mechanical stresses applied to the needle tip under high frequency may lead to the decrease of tree initiation voltage of silicone rubber. And with the increase of frequency, the serious erosion in silicone rubber by electrical tree may be caused by the great increase of dielectric losses.

关键词： Frequency Rubber Trees - insulation Shape measurement Dielectric losses Cable insulation Dielectrics and electrical insulation Voltage measurement Electric variables measurement Hafnium

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