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

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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...

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

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

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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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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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On site PD detection on XLPE cable accessories

On site PD detection on XLPE cable accessories

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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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Technology of detecting GIC in power grids & its monitoring device

Technology of detecting GIC in power grids & its monitoring ...

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

作者： Liu Lian-guang Zhang Hao Liu Chun-ming Guo Jian-hui Guo Qing-xiong Ministry of Education Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control (North China Electric Power University) Beijing China Hunan Chenzhou Electric Power Chenzhou Hunan China

The magnetic storm results in the transmission lines with geomagnetically induced current (GIC). And GIC happening in random has the frequency between 0.001 Hz~0.1 Hz, and continues from several minutes to several hours. Based on elaborating mechanism and characteristic of GIC in grids and the influence on China power grids, the article has conducted the research work of GIC monitoring technology, and has investigated the method of sampling data of GIC, the survey algorithm and the new monitoring device. The simulated test shows, the monitoring device can effectively measure GIC which is signal of quasi direct current and randomness, has advantages of having few data to be handled and needing little memory space, etc

关键词： power grids Computerized monitoring Circuit faults Storms power transmission lines Magnetic sensors Earth Magnetic field measurement Transmission line theory Magnetic devices

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Environmental/Economic Transaction Planning Using Multiobjective Particle Swarm Optimization and Non-Stationary Multi-Stage Assignment Penalty Function

Environmental/Economic Transaction Planning Using Multiobjec...

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

作者： Rui Ma Peng Wang Huachun Yang Guoqiang Hu Changsha University of Science and Technology Changsha China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

This paper presents a new approach for environmental/economic transaction planning model of the electricity market. The environmental/economic transaction planning problem is formulated as a multi-objective optimal power flow (MOPF) problem. A novel algorithm using multiobjective particle swarm optimization (MOPSO) and non-stationary multi-stage assignment penalty function is proposed to solve this problem. PSO is modified by using dynamic neighborhood strategy, new particle memory updating, and one-dimension optimization to deal with multiple objectives. Incorporating of non-stationary multistage assignment penalty function in solving OPF problem can improve the convergence. The proposed method is demonstrated on the IEEE 30-bus system. The results show that the proposed approach can efficiently gain multiple pareto optimal transaction planning that match with the sustainable development strategy

关键词： Environmental economics Particle swarm optimization power generation economics Load flow power system protection power system planning power system economics Fuel economy power system security control systems

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