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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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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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A novel structure of dynamic reactive power source

A novel structure of dynamic reactive power source

引用

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

作者： Yin, Zhongdong Zhang, Jianhua Xiao, Xiangning Cui, Zhengpai Long, Yunbo Key Laboratory of Power System Protection and Dynamic Securty Monitoring and Control Ministry of Education

ISBN: (纸本)0780391144

This paper puts forward a novel topology of controllable reactor, the structure is based on many small capacity thyristor controlled reactor (TCR) modules and a three-windings transformer connecting to system. The transformer secondary adopts duplex winding structure and each has multi-bank TCR modules being in delta connection. In this topology, the harmonic current injected into the power system is very small. It not only possesses all the functions a traditional TCR has, but also has many other merits such as occupying small floor space, generating little loss, easy implement control and protection scheme, and high reliability etc. A 500kvar industrial prototype is under construction in Langfang, Hebei province of ***. Digital simulation based on EMTDC/PSCAD and field test were carried out to verify the perfect harmonics characteristics of topology proposed. © 2005 IEEE.

关键词： Reactive power

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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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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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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 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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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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Data mining used for the assessment of the ability of bidding units

Data mining used for the assessment of the ability of biddin...

引用

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

作者： Li, Ran Li, Jinghua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Provinece China

ISBN: (纸本)0780391144

A new data-mining method for assessment of the ability of bidding units is proposed in this paper. The algorithm of reducing attribute value is introduced to get minimum rules. An example which considers the various factors is illustrated the procedure of finding association among many factors and then obtained the rules to assess bidding units ability. The rules are very useful in supporting the generating bidding unit to make decisions and helping the electric agency (power eXchange -PX) and (Independent system Operator- ISO) to design an optimal trade plans. © 2005 IEEE.

关键词： Electric utilities

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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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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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