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检索条件"机构=Key Laboratory ofPower System Protection and Dynamic Security Monitoring and Control"

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Dielectric barrier discharge in nitrogen and argon

Dielectric barrier discharge in nitrogen and argon

引用

IEEE International Conference on Plasma Science (ICOPS)

作者： Zhan Huamao Ding Lijian Li Chengrong Li Ming Beijing Key Laboratory of High Voltage & EMC Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

Summary form only given. Dielectric barrier discharges in air are generally streamer-like discharges, however, a homogeneous discharge, called atmospheric pressure glow discharge, may be obtained in some noble gases such as helium and argon. Dielectric barrier discharges in nitrogen and argon are studied experimentally to determine mechanisms controlling the transition from glow to streamer discharge. The influences of the applied voltage, the gas gap distance, the gas pressure and other factors on the discharge are investigated. The characteristics of the dielectric barrier discharge in nitrogen and argon are analyzed and compared. The aim of the paper is to study the experimental conditions of obtaining an atmospheric pressure glow discharge in nitrogen and argon. The possibility of obtaining an atmospheric pressure glow discharge in air is examined by increasing the proportion of air in nitrogen gradually. The waveforms of the applied voltage and discharge current under different experimental conditions are reported, which is helpful to describe the characteristics of the discharge and judge whether the discharge is a glow discharge or not

关键词： Dielectrics Nitrogen Argon Glow discharges Laboratories Voltage Atmospheric waves Electromagnetic compatibility Power system protection Power system dynamics

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Novel method for disturbance identification in power systems

Novel method for disturbance identification in power systems

引用

IEEE General Meeting Power& Energy Society

作者： T.S. Bi X.N. Song J.T. Wu Q.X. Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Sifang Protection and Control Company Limited Beijing China

With the development of power grid interconnection, it is necessary for operators to know about system dynamic status while disturbance occurs in power systems in order to take appropriate counter measures to ensure the power system security. The advent of wide area measurement system (WAMS) makes the monitoring of power system dynamic behavior become possible. Based on WAMS, a method for identifying different kinds of disturbance in power system is presented in this paper. Firstly, the features of disturbances (i.e. short circuit, load shedding and loss of generation) that frequently occur in power system are analyzed in detail. Then, based on the idea of pattern recognition, the suggested disturbance identification method is discussed. Finally, computer simulation results are carried out in North China power grid, which demonstrate the validity of theoretical analysis and the feasibility of the proposed disturbances identification method

关键词： Power systems Power system dynamics Power system measurements Power system security Power system interconnection Power grids Wide area measurements Power system analysis computing Power system simulation Integrated circuit interconnections

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The influence of mobile signal in UHF PD monitoring and our solving

The influence of mobile signal in UHF PD monitoring and our ...

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International Symposium on Electrical Insulation

作者： Wei Wang Chengrong Li Bin zheng Guiqian Zhao North China Electric Power University Beijing Beijing CN Beijing Key Laboratory of High Voltage & EMC Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Beijing China

In this paper, the influence of mobile signal in UHF PD monitoring is discussed in types of substation in China. To find the solving, the GSM mobile signal's spectrum are measured and analyzed both in laboratory and onsite. The results show that the mobile signal's spectrum is broad when the phone signal is emitted. It is hard to avoid this interfere only by using narrow measuring band. At the same time, the GSM mobile signal's transmission characteristic in GIS was simulated in our model under laboratory conditions. In brief, our findings are discussed through two projects. The results show our finding is available and effective

关键词： monitoring Substations GSM Laboratories Multiaccess communication UHF measurements Signal analysis Filters Interference Geographic Information systems

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Power factor and power quality improvement in distribution networks via a novel dynamic reactive compensation equipment

Power factor and power quality improvement in distribution n...

引用

7th IET International Conference on Advances in Power system control, Operation and Management, APSCOM 2006

作者： Ji, Hongquan Yang, Yihan Gu, Haibin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Changping District Beijing 102206 China School of Electrical Engineering North China Electric Power University Changping District Beijing 102206 China Power Design and Research Institute Baoding Power Supply Co. Hebei Province Baoding 071051 China

ISBN: (纸本)0863412467

In order to keep the power factor at a high level and maintain acceptable voltage quality in distribution systems, a novel dynamic reactive compensation equipment is proposed. This equipment, which consists of a special regulating autotransformer with a vacuum on-load tap-changer and an intelligent power factor controller (IPFC), adopts step-voltage- regulating control method. It bases on the principle of the capacitor bank's output is in direct ratio with the square of the voltage works on it. In the course of tap- changer switching, the capacitor bank is not cut-out from the power system all along, it is proved in theory that dangerous over-voltage and associated inrush current will not occur. Thus security of the operation on capacitor bank is improved greatly and its natural life will increase much too. Compared with any other dynamic reactive compensation this novel equipment is less expensive and would be more likely to be put to be practical use. In the end, experimental results are given to verify that the proposed equipment has good characteristic of dynamic reactive compensation.

关键词： Power quality

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Study on Wide Area Backup protection to Prevent Cascading Trips Caused by Flow Transferring

Study on Wide Area Backup Protection to Prevent Cascading Tr...

引用

IEEE PES Transmission and Distribution Conference and Exposition

作者： Xu Bi Huang Yang Si Fang Research Institute Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

Protective relays, pivotal devices that can quickly identify and isolate fault area in power systems, is of great importance for power network security and reliability. When relays trip a faulted line in the network, the flow on the faulted line will be transferred to the other lines. Those lines might be overloaded and then cascading tripped by the backup relays, which worsen the system state and even cause blackout. Studies on several well-known blackouts reveal that protective relays are involved and the most troublesome ones are backup protective relays. In this paper the defects of the existing backup protections are investigated in detail first. Then a new wide area backup protection scheme based on WAMS to identify flow transferring is presented. A new concept of flow transferring relativity factor (FTRF) is proposed to estimate the flow distribution after flow transferring occurs; and the method of calculating FTRF matrix on-line is also stated. The simulation of a three machines network shows that the wide-area backup protection scheme to identify flow transferring works well

关键词： Power system protection Protective relaying Power system relaying Power system security Power system faults Power system reliability Wide area measurements Fault diagnosis Power system interconnection Bismuth

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A Nucleolus-Based Profit Allocation Method for Determine Individual Power system Stabilizer's Contribution to system Stability

A Nucleolus-Based Profit Allocation Method for Determine Ind...

引用

International Conference on Power system Technology (POWERCON)

作者： Wei Pan Wenying Liu Yihan Yang Yangnan Li Lin Cheng Yunlong Tang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control in Ministry of Education North China Electric Power University Beijing China Xuji Hitachi Company China

The issue of pricing the services provided by power system stabilizers (PSS) to damp out low-frequency oscillations in large interconnected electrical power grids is proposed. Taking the dominant eigenvalue method for analytical tool to evaluate the increased transfer capability when PSS-control services are utilized, a method based on nucleolus in the cooperative game theory to determine the individual PSS services provider's contribution to power systems stable operation, and allocate the profit obtained by total transaction level increment among all PSS services providers is presented. The calculation results show that the proposed method can achieve rational allocation, and have incentive effect on popularizing PSS application. These are helpful for the stable and economical operation of electricity markets.

关键词： Power system stability Power system interconnection Power system analysis computing Pricing Power grids Eigenvalues and eigenfunctions Game theory Power system economics Power generation economics Electricity supply industry

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A Hierarchical control Scheme for Transient Stability Augmentation by Thyristor controlled Braking Resistors

A Hierarchical Control Scheme for Transient Stability Augmen...

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International Conference on Power system Technology (POWERCON)

作者： X. Y. Zhang S. F. Huang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control (North China Electric Power University) Ministry of Education Si Fang Research Institute North China Electric Power University Beijing 102206 P.R. China. e-mail: huangsf@***

In this paper, a hierarchical control scheme for improving transient stability of power systems by thyristor controlled braking resistor is proposed. Based on three-level co- state prediction method of large-scale system principle, the control structure is organized into a two-layer controller. The lower layer is composed of decentralized local feedback controllers, each of which takes local feedback signal and controls its connected generator. In the upper layer a global controller is designed to enhance the effectiveness of decentralized local controllers. The global controller coordinates local controllers by generating remote feedback signals which ensuring the global optimal solution of the overall system transient performance. The proposed control scheme can guarantee fast and accurate control actions of local controllers when a power system is subjected to large disturbances. Simulation results show the effectiveness of the proposed control scheme.

关键词： Thyristors Resistors control systems Power system transients Power system stability Power system control Power systems Feedback Signal generators Optimal control

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Study on the control of DFIG and its responses to grid disturbances

Study on the control of DFIG and its responses to grid distu...

引用

IEEE General Meeting Power& Energy Society

作者： Ming Yin Gengyin Li Ming Zhou Guoping Liu Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Shijiazhuang Electricity Company Shijiazhuang Hebei China

The paper presents the dynamic model of doubly fed induction generator (DFIG) including the mechanical model, the generator model and the PWM voltage source converter model. The mechanical model uses two-mass model, and the generator model includes both the stator side and the rotor side dynamics. The PWM voltage source converter is modeled as an average model in which the action of power electronic switches is neglected. The paper features vector control of DFIG. On the rotor side converter, the control scheme enables the independent control of speed and reactive power from the stator. On the grid side converter, the control scheme is implemented to regulate the DC voltage and reactive power from the grid as well. In order to study the influence of the grid disturbances on the DFIG, grid voltage dip and quick frequency change are simulated with the engineering software, MATLAB/Simulink. Meanwhile, in the paper the pole-placement method and internal model control method are implemented for designing the PI controllers

关键词： Mathematical model Induction generators Pulse width modulation Pulse width modulation converters Voltage Stators Rotors Reactive power control Switching converters Power electronics

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Operation of a Three-phase Soft Phase Locked Loop Under Distorted Voltage Conditions Using Intelligent PI controller

Operation of a Three-phase Soft Phase Locked Loop Under Dist...

引用

IEEE Region 10 International Conference TENCON

作者： Guoliang Zhou Xinchun Shi Chao Fu Yi Wang Key Laboratory of Power System Protection and Dynaminc Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China

The phase angle of the utility voltage plays a most important role for the operation of FACTS (flexible AC transmission system) and renewable energy systems, and PLL (phase locked loop) should be accurate, fast and robust. Operation of a vector-based soft phase locked loop system under distorted utility conditions is presented in this paper. An intelligent PI controller is proposed to solve the conflict between tracing speed and filtering characteristics, which is to regulate the parameters of PI controller based on the phase error input. All analytical results are verified by simulations and experiments. The merits of high-speed, robust and strongly restraining ability to distorted voltage make it could be widely used in FACTS and renewable energy control systems

关键词： Phase locked loops Phase distortion Voltage control Flexible AC transmission systems Renewable energy resources Robustness Filtering Error correction Analytical models Robust control

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Fast Prediction of Loadability Margins by Constructing a Small-Signal Stability Boundary Based on Neural Networks

Fast Prediction of Loadability Margins by Constructing a Sma...

引用

International Conference on Power system Technology (POWERCON)

作者： Xueping Gu Claudio A. Canizares Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada

Determining loadability margins to various security limits is of great importance for the secure operation of a power system. A novel approach is proposed in this paper for fast prediction of loadability margins with respect to small-signal stability based on neural networks. Small-signal stability boundaries are constructed by means of loading the power system until the stability limits are reached from a base operating point along various loading directions. Back-propagation neural networks (BPNN) for different contingencies are trained to approximate these stability boundaries. A search algorithm is then proposed to predict the loadability margins from any stable operating point along arbitrary loading directions through an iterative technique based on the trained BPNNs. The simulation results for the IEEE two-area benchmark system demonstrate the effectiveness of the proposed method for on-line prediction of loadability margins.

关键词： Neural networks Power system stability Power system security Voltage Power system simulation monitoring National security control systems Operating systems Bifurcation

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