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High-power controllable voltage quality disturbance generator

High-power controllable voltage quality disturbance generato...

引用

International Conference on Electric and Electronics

作者： Gu, Ren Xiao, Xiangning Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)9783642216961

This paper proposes a high-power controllable voltage quality disturbance generator, which is composed of multiplex cascade H bridge modules, and simulates many types of voltage quality problems, such as voltage swell and sag, fluctuation and flicker and so on. One side of the device connects the power system with cascade H bridge to improve voltage level. The other side connects the system directly to aviod the problems caused by series transformer, such as additional phase shifting and voltage drop. Cascade inverter H bridge modules and PWM rectifier H bridge modules are all controlled by triangular carrier phase shifting to increase the equivalent switching frequency of inverter to simplify the control. Finally, a 10kV/2MVA controllable voltage quality disturbance generator has been created. The experiment result proves that the proposed main circuit topology, control strategy and EtherCat-based controller are feasible and efficient. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Bridge circuits

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The analysis and simulation of commutation failure and protection strategies

The analysis and simulation of commutation failure and prote...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies

作者： Wang, Jing Zhao, Chengyong Hu, Jing Yang, Xiaodong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781457703638

Studying the HVDC typical fault-the commutation failure and its protection measures will give some guidance for HVDC engineering, also, it will improve the AC-DC power system safety and reliability with great significance. Based on the analysis of commutation failure of HVDC, the article studies the effect of the commutation failure when the commutation buses have different kinds of AC faults on the base of CIGRE HVDC benchmark model, with the simulation of PSCAD/EMTDC. This in-depth analysis of the causes of commutation failure, the type and characteristics of the fault will be done in this paper. Basis for the characteristics of HVDC system, combined with AC transmission relay protection tuning principle, conservation and protection action principle approach, are given to promoting HVDC transmission should take measures to return to normal. The simulation results show that the HVDC transmission recovers from commutation failure effectively after the fault is cleared due to the high controllability of the system and the reasonable protection strategies. © 2011 IEEE.

关键词： Electric commutation

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Research and development of an intelligent system dealing with alarm messages coming from regional power grid control centers

Research and development of an intelligent system dealing wi...

引用

International Conference on power system Technology (powerCON)

作者： Zhang, Xing Zhang, Haibo Key Laboratory of Power System Protection and Dynamic Security Monitoring North China Electric Power University Beijing China

ISBN: (纸本)9781424459407

In order to overcome the disadvantage that there are hardly any analysis functions on alarm messages in current EMS, an Intelligent Expert system which processes all alarm messages from the regional Grid Dispatching Center is designed and developed in this paper. When there is only one SCADA data source, the system receives and identifies real-time alarm messages from dispatching center, finds out and deletes the false alarm messages and then estimates the current state of power grid. If there is no fault but some abnormal warning information is generated by electrical equipments, the system analyses the abnormal warning information and suggests corresponding measures that dispatcher should take. If some fault has occurred, the system classifies the alarm messages and provides the necessary information for fault diagnosis after further processing. After the system is completed, it will improve the quality of surveillance and provide richer and more intelligent auxiliary decision support. ©2010 IEEE.

关键词： Expert systems

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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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A novel voltage balance control strategy of AC-DC-AC converter

A novel voltage balance control strategy of AC-DC-AC convert...

引用

2009 International Conference on Energy and Environment Technology, ICEET 2009

作者： Yang, Zhang Yin, Zhong-Dong Tao, Huang Qiu, Hong Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9780769538198

A general problem in the double PWM converter is the voltage unbalance of the dc-link capacitors. This unbalance distorts the waveforms of the output voltage and current. Furthermore, it will lead to instability of the inverter system. Based on the analysis for the unbalance problem, a novel feedback control strategy of DC capacitor voltage deviation is proposed in this paper. The method does not add extra circuit. Build an simulation model of AC-DC-AC converter, the results show that control strategy is correct. © 2009 IEEE.

关键词： Pulse width modulation

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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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A methodology for vulnerability assessment of backup protection under cascading failures

A methodology for vulnerability assessment of backup protect...

引用

International Conference on Critical Infrastructure

作者： Yang, W.H. Bi, T.S. Huang, S.F. Xue, A.C. Yang, Q.X. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing 102206 China

ISBN: (纸本)9781424480814

To avoid undesired operation of backup protection caused by load encroachment under cascading failures, the methodology for vulnerability assessment of backup protection is studied. In this paper, the vulnerability assessment of backup protections is formulated as a mixed integer nonlinear programming problem, which is solved by the binary particle swarm optimization approach. The measurement index for assessing the vulnerability of backup protection is given as well. The simulation results on New England 39-bus system demonstrate that the proposed method can effectively assess the vulnerability of backup protection under cascading failures. © 2010 IEEE.

关键词： Particle swarm optimization (PSO)

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Research on temperature field of turbo-generators based on coupled physical field

Research on temperature field of turbo-generators based on c...

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International Conference on Electrical Machines and systems, ICEMS 2007

作者： Junqing, Li Shaoli, Ma Heming, Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 China

ISBN: (纸本)8986510081

Temperature is one of the important physical variables in turbo-generators, so accurate prediction of temperature is very necessary in generators design and operation. This paper presents coupling mathematical model of electromagnetic and temperature field and calculates them by finite element method (FEM). First, magnetic field distribution of generators is accurately determined, so thermal source is known. Then, the mathematical model of temperature field is proposed, and temperature filed can be obtained. Couple Hield of electromagnetic and temperature in QFSN-200-2 turbo-generators is calculated by finite element analysis software (ANSYS), the proposed method is validated to be correct by comparing calculation and measurement values.

关键词： Electromagnetic fields

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A novel method for determining minimum break point set based on network reduction and relays incidence matrix

A novel method for determining minimum break point set based...

引用

International Conference on Critical Infrastructure

作者： Ye, Donghua Ma, Jing Wang, Zengping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424480814

This paper presents a simple and effective approach based on two dynamic matrixes of node-relay matrix (NRM) and relay-incidence matrix (RIM) to determine minimum break point set (MBPS) for coordination of the directional relays. Firstly, the NRM and RIM are defined and their calculation methods are developed. Then, some optimization operations for network reduction and special structure are presented to update the NRM and RIM and the detailed flowchart is provided. At last, case studies on various topologies demonstrate the effectiveness and simplicity of the proposed method. © 2010 IEEE.

关键词： Geometry

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Recent progress and future perspective on condition monitoring and diagnostic techniques for power equipments in China

Recent progress and future perspective on condition monitori...

引用

2008 International Conference on Condition monitoring and Diagnosis, CMD 2008

作者： Li, Chengrong Tang, Zhiguo Zheng, Zhong Beijing Key Laboratory of High Voltage Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424416219

Under the general backgrounds of fast development of economy, China' power industry is undergoing a new upsurge of infrastructure construction. With the urgent need of the whole society for reliable power supply, Condition Based Maintenance strategy is becoming the mainstream of the operation and management of the power system. In this paper, recent progress of Condition monitoring and Diagnostic technologies for major power apparatus are reviewed. Also, some statistical data on practical on-line monitoring applications in China are introduced. At last, the key problems and trends of CMD are discussed with a viewpoint future perspective. ©2007 IEEE.

关键词： Condition based maintenance

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