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检索条件"机构=Laboratory of Power System Protection and Dynamic Security Monitoring and Control"

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Condition-Based Maintenance of Electrical Equipments Based on 1D3 Algorithm and Monte Carlo Stimulation

Condition-Based Maintenance of Electrical Equipments Based o...

引用

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

作者： Li Ran Chen Li Gu Xueping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Condition-based maintenance is an advanced maintenance strategy which is based on the monitoring of equipments status and according to the results of monitoring and analysis people can arrange maintenance scientifically. When monitoring and analyzing the status of equipments, there are vast historical and on-line data to analyze. If we can find the main factors leading to equipment failure through analyzing the data and pay more attention to these factors, we can make maintenance decision more exactly and quickly. In this paper we propose to apply ID3 algorithm to classify the data according to the importance of their influence to equipment failure and then find the factors which influence equipments most. After finding the most important factors, apply Monte Carlo simulation to forecast the probability of equipment failure which occurs in their operational life span, and according to this we can pay more attention to monitor the factors which result in failure easily

关键词： Monte Carlo methods Condition monitoring Maintenance Equipment failure Data analysis Data mining Algorithm design and analysis Failure analysis power system reliability Time series analysis

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Research on Super Capacitor Energy Storage system for power Network

Research on Super Capacitor Energy Storage System for Power ...

引用

International Conference on power Electronics and Drive systems (PEDS)

作者： Jiancheng Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

A Super Capacitor Energy Storage (SCES) system applied to distributed generation system and distribution network is presented, which is mainly composed of three parts: the electrical double-layer capacitors array that stores energy, the AC/DC-DC/AC power converter system and the integrated control system composed of microprocessors. Application studies of the SCES system for active power supply, voltage control, voltage oscillation elimination and harmonic elimination are described. The stability and control effect of the system relation to the node impedance are analyzed in detail. This paper also presents studies on experiments of the SCES system synchronous and re-synchronous operating with power network when grid fault and recovered.

关键词： Capacitors Energy storage Supercapacitors Distributed control DC-DC power converters Centralized control Microprocessors power supplies Voltage control power system harmonics

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The similitude power detection on single-phase-to-ground fault in the non-solidly grounded system

The similitude power detection on single-phase-to-ground fau...

引用

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

作者： Chengyong Zhao Yanfen Guo Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Detecting single-phase-to-ground fault is a difficult and challenging problem in the non-solidly grounded system that includes neutral point ungrounded, neutral point high-resistance grounded and neutral point compensated extinction coil grounded system. It is important to identify the faulted line quickly and exactly to reduce the time and effort necessary to locate and remove the fault, so that the probability of a second ground fault with its destructive currents can be reduced significantly. Based on analyzing the characteristics of the existing methods about identifying the faulted line in the non-solidly grounded system, the characteristics of the lines' zero-sequence current and the system's zero-sequence voltage and the relationship between every line's zero-sequence current and the system's zero-sequence voltage are analyzed deeply and a new method using similitude power to determine the faulted line is presented. The method can be applied to neutral point ungrounded system and neutral point ineffective grounded system to determine the faulted line accurately when resistance ground faults occur. Various ground faults under different conditions are simulated using MATLAB. The results show the method is feasible and effective

关键词： Fault detection Circuit faults Fault diagnosis power system faults power system security power system transients Voltage power system protection power system harmonics Coils

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Decomposition on Pollution Current of Load Emitting and Analysis of Its Influence on power Price

Decomposition on Pollution Current of Load Emitting and Anal...

引用

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

作者： Xiufang Jia Chengyong Zhao J. Suo Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Along with the increment of disturbing loads in the power system, the effect on network that is brought by the power quality problems, become increasingly serious. Based on the market bargaining principles, the power price should be affected by the disturbance of loads. However current power price system fails to reflect the factor. Evaluation of load's disturbing property and analysis of its influence to power price is performed in this paper. The load current can be decomposed into three parts: instantaneous active current, instantaneous fundamental reactive current and instantaneous distorted current by the generalized instantaneous reactive power theory in dq0 coordinate system. The reactive current emission factor reflecting pure resistance of load and distorted current emission factor reflecting load's linearity are defined. According to these two factors, the evaluation method of the effect of the disturbing load on the power price based on allocating compensation equipment's cost is presented. The method provides some basis for contract's subscribing in the future. The calculated example shows the feasibility of above method, as well the degree of the influence of the disturbing load upon the power price

关键词： Pollution power quality Reactive power power system harmonics Costs Nonlinear distortion Educational programs Voltage power system analysis computing Performance analysis

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Study on the Influence of TCSC on Fault Component Distance protection

Study on the Influence of TCSC on Fault Component Distance P...

引用

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

作者： Liu Qing Wang Zengping Xu Yan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Based on the characteristics of TCSC, the influence of TCSC on fault component distance protection is analyzed. With the new setting resistance to be Z Zd -jX C , the action of fault component distance protection on the line equipped with TCSC is presented. It is concluded that the fault component distance protection will not act incorrectly, but the range of protection will be reduced, especially when the TCSC is bypassed

关键词： power capacitors Thyristors Impedance power system protection Protective relaying power system stability Circuit faults Inductance power transmission lines power system dynamics

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Research on Flywheel Energy Storage system Using in power Network

Research on Flywheel Energy Storage System Using in Power Ne...

引用

International Conference on power Electronics and Drive systems (PEDS)

作者： Jiancheng Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

The flywheel energy storage (FES) system presented in this paper is composed of four parts: the flywheel, the bearing, the motor/generator and the power converter. The control methods and strategy of the FES system in power network are introduced in detail. During the storage period and generating times, the waveform of the power converter output currents is controlled to be sinusoidal by using sinusoidal pulse width modulation (SPWM) control method, so the efficiency of the energy conversion is high and the torque ripple of the motor/generator is minimized. The control methods of starting and operating large moment of inertia of the flywheel are simulated and studied for the power converter. The latest experimental results of the FES system are introduced, and the control validity is verified through these results.

关键词： Flywheels Energy storage power generation Pulse width modulation converters control systems Pulse generation Torque control Torque converters Pulse width modulation Energy conversion

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The Output Spectrum Analysis of High-power Multilevel Voltage Source Converters using Double Fourier Series

The Output Spectrum Analysis of High-Power Multilevel Voltag...

引用

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

作者： Xu Jiang Xiangning Xiao Hao Liu Yulong Ma Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Electric Power of Henan Zhengzhou China

This paper presents a theoretically analytical technique for determining the spectral components of high-power multilevel voltage source converters. The technique uses double Fourier series to analyze the output waveform of multilevel asynchronous asymmetrical regular sampling SVPWM converter. The 3-D spectrum representation of the SVPWM based on the extension geometrical-wall-model is given in this article. According to the analytical method of two-level SVPWM and the phase-shifted carrier PWM, the new DFS of multilevel SVPWM of single phase is obtained. In order to validate the theoretically analytical method, a six modules cascaded H-bridge converter model using PSCAD is built. By comparing the spectrum and waveform calculated with the simulation, the correctness of the analytical formulas has been proved. And the technique can act as the method of selection PWM. Moreover, the technique can be used to analyze the output waveform of the high-voltage and high-power FACTS equipments, such as SVG, SSSC, UPQC

关键词： Voltage Fourier series Space vector pulse width modulation Harmonic analysis Switching frequency Sampling methods Analytical models power system harmonics Pulse width modulation inverters PSCAD

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Study on wide area measurement system based transient stability control for power system

Study on wide area measurement system based transient stabil...

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International power Engineering Conference (IPEC)

作者： F.F. Song T.S. Bi Q.X. 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

In this paper, the state of the arts of power systems in China and some applications in transient stability control based on wide area measurement system (WAMS) are introduced briefly. With the development of power grid interconnection and transmission utility deregulation, the operation of electric power system become more and more complex, which challenges the security and transient stability control of power systems. The advent of WAMS opens a new path to the system trajectory prediction and real time closed-loop stability control to prevent power system outage. The defects of current transient stability control system are analyzed, then a possible scheme of transient stability control based on WAMS is proposed, and the corresponding future work is put forward as well. Finally, a new way of solving cascading events is discussed

关键词： power system transients power system stability power system control Wide area measurements control systems power system measurements power systems power system interconnection power system security power system analysis computing

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PD detection of XLPE cables accessories on UHF

PD detection of XLPE cables accessories on UHF

引用

Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Bin Zheng Wei Wang Chengrong Li Changyu Li Luhua Zhang Beijing Key laboratory of High Voltage & EMC Key Laboratory of Power System Protection Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

monitoring the partial discharge (PD) on site in cables accessories is now a more effective method of cable tests. Meaningful PD measurement can obtain reliable information on the condition of sealing ends and joints after installation or several years of operation which can contribute to considerable overall reduction of error risk. The UHF (ultra high frequency) method is an effective PD detection method. It shows out the superiority in measurement sensitivity and suppressing interference. It has been confirmed that the frequency of the PD pulse generated in cables can reach up to GHz, while the frequency of background noise usually lies below 400 MHz. Experiments show that the UHF PD pulse can radiate from the disconnection between the shields in the sealing ends or the joints, and it can also radiate out along the ground wire or the cross-linked wire. Moreover, the detection by UHF sensor towards four different types of PD models have been done in laboratory, such as sliding discharge model, floating discharge model, protrusion discharge model and cavity discharge model. Mass of statistic results of these PD pulses indicate the distinct characteristics. It can help to do the pattern recognition research, even to do further research on fault diagnosis for XLPE cables.

关键词： Cables Partial discharges Frequency UHF measurements Wire Testing Partial discharge measurement Interference suppression Pulse generation Background noise

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Project Study of dynamic Voltage Restorer

Project Study of Dynamic Voltage Restorer

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

作者： Zhongdong Yin Minxiao Han Lixia Zhou Kunshan yU Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University China China Electrical Power Research Institute Beijing China

The paper studies a practical project of 2 MVA dynamic voltage restorer on the basis of transformer-less cascade multilevel topology, it discusses each part working principle of DVR, but also provides a practical voltage sag problem solving scheme for a 6 kV feed line based on proposed cascade structure. EMTDC/PSCAD based simulation results verify the validity of proposed scheme

关键词： Voltage fluctuations power quality power system dynamics power system restoration Computer aided manufacturing Variable speed drives Umbilical cable Electricity supply industry Accidents Superconducting magnets

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