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

共 565 条记录，以下是481-490 订阅

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Synthetic quantitative assessment of power quality in competition market environment

Synthetic quantitative assessment of power quality in compet...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Xu, Yonghai Chen, Lei Xiao, Xiangning Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry ot Education Beijing China

ISBN: (纸本)0780391144

A new method, which integrates the virtue of the probability and mathematical statistics with that of the fuzzy mathematics for power quality assessment, is proposed in this paper. The index showing an aspect of power quality is evaluated using probability and mathematical statistics respectively;the global unique index of these indexes can be obtained. The results obtained from each index unified are unified again using fuzzy synthetic appraisal in order to give an objective, overall and unique index of power quality. The special assessment method for voltage sag using the Average Sag Energy Index is also discussed. Finally, a transaction mode makes the maximum benefits for different unit commitment as objective function and takes the power quality into account is presented, and then power energy really becomes a commodity which would be evaluated a price according to power quality. © 2005 IEEE.

关键词： Electric power systems

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Project study of dynamic voltage restorer

Project study of dynamic voltage restorer

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Yin, Zhongdong Han, Minxiao Zhou, Lixia Yu, Kunshan Key Laboratory of Power System Protection and Dynamic Securty Monitoring and Control Ministry of Education China Electric Power Research Institute Beijing China

ISBN: (纸本)0780391144

The paper studies a practical project of 2MVA 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 6kV feed line based on proposed cascade structure. EMTDC/PSCAD based simulation results verify the validity of proposed scheme. © 2005 IEEE.

关键词： Voltage control

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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

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

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

ISBN: (纸本)0780391144

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. © 2005 IEEE.

关键词： Electric converters

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Iterative prony method based power system low frequency oscillation mode analysis and PSS design

Iterative prony method based power system low frequency osci...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

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

ISBN: (纸本)0780391144

This paper presents an identification method based on the iterative Prony to identify transfer function and configure PSS parameters using residue way. The iterative Prony is a very useful method to acquire power system oscillation modes, by which the system eigenvalue, oscillation frequency, amplitude, damping and relative phase can be directly estimated using the response of given input signals. Considering the influence of input signal on output signal, the iterative Prony can acquire the transfer function of power system, then, according to the corresponding residues we conducted coordinated setting of power system stabilizer (PSS) by residue method. The simulation results for two testing system examples prove that this proposal method is effective in the power system oscillation mode analysis and parameters determination of PSS, can improve eigenvalues of system and can enhance system damping after PSSs whose parameters are optimized by above method are built into power system. © 2005 IEEE.

关键词： Standby power systems

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New mitigating measures against core saturation by series of additional grounding resistance from the point of view of network configuration

New mitigating measures against core saturation by series of...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Ma, Yulong Xiao, Xiangning Jiang, Xu IEEE Key Laboratory ofPower System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing China

ISBN: (纸本)0780391144

High current of HVDC grounding electrode will induce a high potential in the nearby substation ground grid if the soil resistivity is high. Once there are potential differences among the ground grids, direct current will flow through the neutral grounded transformer. If the direct current through transformer winding is high enough core saturation will occur. The paper presented a method of series of additional resistance between the transformer neutral point and ground grid from the point of view of network configuration. A novel optimized algorithm is adopted in order to calculate the grounding resistance. Method presented in the paper is tested with China South Grid data. Results show that current through transformer neutral point can be reduced greatly and thus core saturation can be avoided. © 2005 IEEE.

关键词： Electric grounding

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Research on dynamic mathematic model of VSC-HVDC based on energy conservation principle

Research on dynamic mathematic model of VSC-HVDC based on en...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Li, Guangkai Li, Gengyin Zhao, Chengyong Liang, Haifeng Yin, Ming IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei China

ISBN: (纸本)0780391144

Voltage Source Converter (VSC) based HVDC (VSC-HVDC) technology is a kind of newly developed HVDC transmission technology. Based on analyzing the fundamental functions of VSC-HVDC, a dynamic mathematic model based on energy conservation principle is developed in this paper. The process of energy conversion and dynamic operation mechanism are analyzed. Theoretical analysis and the control system are validated by simulation on software PSCAD/EMTDC. © 2005 IEEE.

关键词： Energy conservation

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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

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Yang, Ming-Yu Wang, Shi-Xu Mao-ying, Chen Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)0780391144

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. Lipschltz 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. © 2005 IEEE.

关键词： EHV power transmission

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Application in electric power system transient stability analysis with PC cluster system

Application in electric power system transient stability ana...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Lu, Jinling Yu, Lei Zhu, Yongli Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)0780391144

In this paper, a simple parallel calculation cluster is built by PC and local area network. The power electric network is divided into several subnets according the method of path graph partitioning. Subnets are allocated to PC unit to calculate individual and the server is in charge of adjusting process and counting the current of link line. Besides soft-hard ware environment of PC cluster is given in this paper and the design and implementation of program are also presented. The key technique and way to settle problem are discussed during implementation procedure. At last, the IEEE39 nodal points system is tested. The satisfaction result is gotten by comparing to single computer. © 2005 IEEE.

关键词： Electric power transmission networks

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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...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

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

ISBN: (纸本)0780391144

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 multi-stage 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. © 2000 IEEE.

关键词： Strategic planning

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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

Sixth International Conference on power Electronics and Drive systems, PEDS 2005

作者： Jianeheng, Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)0780392965

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 timei, 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. © 2005 IEEE.

关键词： Energy storage

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