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

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A novel harmonics injecting approach on over saturation suppression of DVR series injection transformer

A novel harmonics injecting approach on over saturation supp...

引用

International power Engineering Conference (IPEC)

作者： Zhongdong Yin Lixia Zhou Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education. North China Electric Power University China

ISBN: (纸本)9810557027

Voltage problems can be effectively solved by series compensators coupled with series injection transformers. However, the magnetic flux in iron core of series transformer may change in a large range depending on the close angle of injecting voltage, at the same time iron core easily get over saturated. Over saturation in transformer iron core leads to produce large field inrush current and distortion on compensating voltage wave, bring about hazard to operation of transformer and inverter, also increase the possibility of relay mishandling and finally decrease reliability of power supply. This paper analyzes the over saturation mechanism of series injection transformer and presents a novel harmonics injection control approach to suppress. The validity of proposed approach is verified by calculation and simulation

关键词： Circuit faults Iron Transformer cores Magnetic cores Magnetic flux Surges Hazards Inverters Relays power supplies

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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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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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Monte Carlo Simulation Based Available Transmission Capability Calculation

Monte Carlo Simulation Based Available Transmission Capabili...

引用

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

作者： Yajing Gao Ming Zhou Gengyin Li Yuekui Huang Limin Xiao Rui Li Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

With the further development of power markets, large amount of electric power wheeling and frequent transmission transaction is emerging, accurately determining available transmission capability (ATC) and broadcasting the ATC information in time are very important to prevent and relieve transmission congestion effectively. In practical power markets, there are large amount of uncertainties involved in transmission reliability margin (TRM) and capacity benefit margin (CBM) of ATC. Considering calculation accuracy and time, a novel approach is proposed to calculate ATC based on Monte Carlo simulation and sensitivity analysis considering large amount of uncertainties impacting the value of ATC. The steady state constraints and voltage stability and transient stability constraints are taken into account. The iterative solution based on PSASP by China EPRI is developed. IEEE 14-bus test system is used to verify the presented approach. The results show that the model and algorithm is correct and effective. The research achievements are undergoing to transfer to the application in certain provincial power system in China, and some new problems are suggested in the end of paper

关键词： power markets Uncertainty Stability power system modeling Broadcasting Transmission line measurements Accuracy Sensitivity analysis Steady-state Voltage

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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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Research on the Arithmetic of Non-unit Voltage protection for EHV Transmission Line Based on Wavelet Analysis

Research on the Arithmetic of Non-unit Voltage Protection fo...

引用

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

作者： Ming-yu Yang Shi-xu Wang Chen Mao-ying Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

This paper presents a new non-unit voltage protection algorithm for extra high voltage (EHV) transmission lines. This scheme is developed using wavelet analysis, in which the singularity of fault transient voltage signals in one terminal is utilized to discriminate clearly between internal and external faults. Lipschitz exponent (LE) is obtained from wavelet modulus maximum to detect singularity of signals. A typical 500-kV EHV transmission system has been simulated by ATP to evaluate the scheme. The simulation results show that this scheme is capable of providing correct responses under various system configurations and fault conditions

关键词： Arithmetic Voltage Transmission lines Wavelet analysis power system transients power system protection power transmission lines Wavelet transforms Circuit faults Signal detection

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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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Project Study of dynamic Voltage Restorer

Project Study of Dynamic Voltage Restorer

引用

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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On site PD detection on XLPE cable accessories

On site PD detection on XLPE cable accessories

引用

Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference

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

On-site partial discharge detection on XLPE cables accessories is very difficult because of pulse noise interference, such as pulse interference created by automobile ignition coils on the street, etc. A suitable solution for the monitoring of cable accessories during operation is a sensitive on-site PD detection method. This can be realized in an advantageous way with combinatorial sensors, an antenna sensor, a UHF sensor, and two VHF split-core PD sensors. These sensors are not connected to the high voltage directly, a UHF sensor can be placed near the cable joint and two split-core sensors can be installed on both sides of the cable joint easily and safely. The detection making several windows in the time domain towards multiple wide-band pulse signals can achieve reliable discrimination of real internal PD and external noise under noisy on site conditions. More than twenty cases of on-site PD detection for HV XLPE cables have been proven this way. This method has high detection sensitivity and high noise recognition ability

关键词： Partial discharges Cables Interference Automobiles Ignition Coils monitoring UHF antennas Voltage Wideband

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