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3rd International Conference on Deregulation and Restructuring and power Technologies, DRPT 2008

作者： Jia, Xiufang Bo, Zhang Fazhan, Liu Minghao, Sun 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 Zhengzhou Power Supply Company Zhengzhou 450012 Henan Province China

ISBN: (纸本)9787900714138

Assessment of load's disturbing property needs to be studied for confirming power quality responsibility and making a power price by its quality. In this paper, load's disturbing property is assessed by means of the analytic hierarchy process (AHP) and the grey relational analysis (GRA). First, the weight of index such as power factor, current total harmonic distortion, unbalance factor and reactive power fluctuation, which can characterize load's property, is obtained by AHP method. In order to assess the degree of load disturbance, a standard load in power system is defined. Then, based on the GRA, can get relativity degree between each disturbing load and standard load. Relativity degree can describe the gap between each disturbing load and standard load. The degree that disturbing loads creates influence to the electrical network is known by means of relativity degree. Finally, Calculating examples are brought forth to validate feasibility of the method. © 2008 DRPT.

关键词： Analytic hierarchy process

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A new approach on implementing Hybrid dynamic simulation based on wide area measurements 16

A new approach on implementing Hybrid Dynamic simulation bas...

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16th power systems Computation Conference, PSCC 2008

作者： Han, Dong Ma, Jin Sheng, Wenjin He, Renmu Yue, Chengyan Zhang, Jin Germond, Alain Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing102206 China ABB Research Center Beijing China Ecole Polytechnique Federale de Laussane Switzerland

ISBN: (纸本)9780947649289

As the most important tool guiding the power system operation and control, digital simulation directly affects the secure and economic operation. Consequently, the dynamic simulation validation work has been highly focused recently. This paper proposes a new method to implement the Hybrid dynamic simulation. With this method, the data from Wide Area Measurements (WAMs) can be injected into the simulations, thus a big power grid is decoupled into several small systems. All data in these small systems are kept when the conventional digital simulation is carried out, while the boundaries of these small systems are replaced by the signals of WAMs. Then the space to search the erroneous component is limited to the decoupled system, which is much smaller with fewer components. Case studies show the efficiency of the proposed method in simulation validation work.

关键词： Geodesy

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Effect of uncertainty in load model on power system dynamic simulation

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2008年第19期28卷 69-74页

作者： Han, Dong Ma, Jin He, Ren-Mu Yue, Cheng-Yan Zhang, Jin Rehtanz, C. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China Limited CNCRC Beijing 100016 China

In order to solve the disadvantages of Mont-Carlo simulation method used in typical uncertainty analysis, this paper adopted a new method-probabilistic collocation method (PCM) to analyze quantitative uncertainties of dynamic load proportion in dynamic simulation and stability analysis. A case study-New England 10-machine 39-bus system, verified the practicability and validity of the proposed method for uncertainty analysis in dynamic simulation. The results showed that the uncertainties in load composition at buses which are close to the fault site and at the buses that have heavy loads, have strong effects on transient stability, while some load buses that have heavy loads, is little far from the fault site, still have stronger effects on transient stability. It is concluded that the proposed method could directly describe the desired output as a polynomial of parameters. Consequently, the probability distribution of the response could be acquired by probability density function of parameters and much fewer simulations.

关键词： dynamic loads

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Comparison between Periodic Function Space based power Theory and Traditional power Theory

Comparison between Periodic Function Space based Power Theor...

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11th International Conference on Electrical Machines and systems(第11届国际电机与系统会议)

作者： Fei Wang Qixun Yang Zengqiang Mi North China Electric Power University/Key Laboratory of Power System Protection and Dynamic Security North China Electric Power University/Key Laboratory of Power System Protection and Dynamic Security

The comparison between Periodic Function space based power theory and three other power theories including traditional power theory, instantaneous power theory put forward by Akagi and Fryze power theory are analyzed in this paper. The consistency and difference are indicated in several different aspects: physical meaning, mathematical concept and the derivation of expressions. Analyses shows that traditional power theory can be regarded as a special case of Periodic Function space based power theory, in other words, Periodic Function space based power theory can be regarded as the generalization of traditional power theory. Fryze power theory is in accordance with Periodic Function space based power theory in single-phase nonsinusoidal system, instantaneous power theory is in accordance with Periodic Function space based power theory in three-phase symmetrical system without zero-sequence component.

关键词： Reactive power Voltage power system harmonics Space technology Laboratories power system protection power system dynamics power system security monitoring Control systems

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Transient Stability Analysis of Asynchronous Distribution Generation and its Impact on protection

Transient Stability Analysis of Asynchronous Distribution Ge...

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2008 IET 9th International Conference on Developments in power system protection (DPSP 2008)

作者： Tianshu Bi Hongwei Zhao Peng Dong Qixun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring & Control (MOE) North China Electric Power University Beijing China

It is of great importance to study the dynamic behavior of distributed generation (DG), which might affect the fault level and protection system of distribution network greatly. In this paper, the transient stability of asynchronous type of DG is comprehensively analyzed. The critical shedding time and corresponding slip of DG are calculated. It is pointed out that the fault clearing time of existing relays cannot guarantee DG operates stable when a fault occurs in distribution network. The countermeasures to low down the possibility of instability of DG are suggested. Finally, case studies are carried out using PSCAD to demonstrate the viewpoint of this paper.

关键词： Torque Rotors Stability analysis Impedance Transient analysis Electromagnetics Resistance

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Electric energy measurement based on the effective absorbed power under non-sinusoidal conditions

Electric energy measurement based on the effective absorbed ...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： L. X. Zhou Z. D. Yin X. N. Xiao Y. W. Zhu Z. Q. Wang Laboratory of Power System Protection and Dynamic Security Monitoring North China Electric Power University Beijing China

Along with the rapid development of power electronic technology, the application of non-liner load becomes more and more with the capacity becomes larger and larger. Massive harmonics are poured into the power grid, leading to the distortion of the system voltage and current. Meanwhile, the nonliner loads usually own complex characteristics such as power inrushing, three phase imbalance, harmonics, inter-harmonics, and so on, which directly affect the correctness and validity of energy measuring. Therefore, the energy metering instrument which designs based on the sine power theory or the traditional non-sinusoidal power theory can not reflect the real energy that the loads absorb form the system. The correct definition and measurement of power under distortion condition become a matter of common concern both to the power supply system and the customers. In this paper, IEEE Std. 1459-2000 is studied and a novel energy measuring method based on the effective absorbed power is put forward. Beginning with the analysis of energy transmission and the line-loss, the total energy of the system is quantified. The shortcomings of the traditional power theory and the corresponding algorithm in analyzing the energy measurement are studied comprehensively. In view of the background harmonic, the energy measuring methods are studied from the line-loss and effective absorbed power. The analysis results indicate that the method proposed in this paper can correctly reflect the power consumption of the surge loads and the exchange energy.

关键词： Energy measurement power measurement power system harmonics Distortion measurement Surges power electronics power grids Harmonic distortion Voltage Phase measurement

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power system transient stability assessment based on WAMS dynamic trajectories

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Dianli Xitong Zidonghua/Automation of Electric power systems 2008年第23期32卷 18-22页

作者： Qin, Xiaohui Bi, Tianshu Yang, Qixun Ma, Shiying China Electric Power Research Institute Beijing 100192 China Laboratory of Power System Protection and Dynamic Security Monitoring North China Electric Power University Beijing 102206 China

Some technical issues in the application of EEAC are discussed. A novel integrated rotor angle criterion, which includes both historical and future information of rotor angle curves, is proposed to identify the true critical cluster. Additionally, a composite criterion using the slope and angle of dynamic saddle point (DSP) is proposed to judge whether the DSP is the true DSP resulting in losing stability. Finally, the flowchart of transient stability assessment criterion is given. The simulation results demonstrate that the proposed method works well. It can assess transient instability even when the characteristic of instability is not obvious enough to take measures such as splitting as soon as possible.

关键词： Stability criteria

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A fault classification method based on spectrum of fault component for EHV lines

A fault classification method based on spectrum of fault com...

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IEEE General Meeting power& Energy Society

作者： X. G. Wang S. F. Huang Q. K. Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

This paper proposes a fault classification scheme for transmission lines based on spectrum of fault component. First it analyses the spectrum of fault component, then the characters of power frequency and nature frequencies in two data windows are used to identify fault type and fault phase respectively. The scheme performance was proven using ATP/EMTP simulations in a 500-kV power system considering different fault types and fault locations. The results show that the scheme works quickly and is not impacted by harmonics and the DC offset. It is also not sensitive to sampling rate and fault inception angle.

关键词： power transmission lines Circuit faults Frequency domain analysis Fault diagnosis Relays power systems Fault location

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Study of transient spectrum in transmission lines

Study of transient spectrum in transmission lines

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IEEE General Meeting power& Energy Society

When faults occur in transmission lines, the high frequency signals are caused by fault generated traveling waves and the spectrum is a series of harmonic in frequency domain. This paper utilizes lumped and distributed parameter models to express transmission lines respectively, analyzes the character of nature frequencies. Different influencing factors including different fault conditions, source impedance, bus capacitance, series compensated capacitance and shunt reactor are discussed in this paper. The results have been proven by ATP procedure in a typical 500- Kv power transmission line.

关键词： power transmission lines Capacitance Circuit faults Relays Copper Shunt (electrical) Inductors

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A security mechanism of Web Services-based communication for wind power plants

A security mechanism of Web Services-based communication for...

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IEEE General Meeting power& Energy Society

作者： Nian Liu Jianhua Zhang Wenxia Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

The IEC 61400-25 standard has defined mapping of power plant information model to Web services. How to ensure the security of Web services-based communication for wind power plants is a unsolved problem. WS-security is a standard used to deal with the security requirement in application of Web services, while username/password and X.509 certificates are security tokens most commonly used in electric power utility. We propose a security mechanism that deal with the requirements of authentication, integrity, non-reputation, and confidentiality across the communication process based on WS-security and the two security token. The security mechanism is implemented by extension of SOAP message, design of security agent, and the related security message processing algorithm. An instance is modeling based on IEC 61400-25 to demonstrate the security enhanced remote control of wind power plants. The result support the usefulness of the security mechanism for Web Services-based wind power plants communication.

关键词： security Cryptography Wind power generation Web services Simple object access protocol Authentication IEC

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